FTH

SEC source: 0001104659-26-062608 · tm2614687-4_4seq1.xml · nonDerivative · entry 12

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 133,986

F14 · price: Represents VWAP of purchases of 1,108 shares of the Company's Common Stock on April 7, 2026 at $33.38 per share.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062608 · tm2614687-4_4seq1.xml · nonDerivative · entry 11

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 141,029

F13 · price: Represents VWAP of sales of 45 shares of the Company's Common Stock on April 6, 2026 at prices ranging from $31.80 to $32.17.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062608 · tm2614687-4_4seq1.xml · nonDerivative · entry 10

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 141,029

F12 · price: Represents VWAP of sales of 1,214 shares of the Company's Common Stock on April 6, 2026 at prices ranging from $30.64 to $31.345.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062608 · tm2614687-4_4seq1.xml · nonDerivative · entry 9

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 141,029

F11 · price: Represents purchases of 1,104 shares of the Company's Common Stock on April 6, 2026 at $31.02 per share.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062608 · tm2614687-4_4seq1.xml · nonDerivative · entry 8

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 144,974

F10 · price: Represents VWAP of sales of 1,134 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $34.40 to $35.25.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062608 · tm2614687-4_4seq1.xml · nonDerivative · entry 7

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 144,974

F9 · price: Represents VWAP of sales of 374 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $33.23 to $33.45.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062608 · tm2614687-4_4seq1.xml · nonDerivative · entry 6

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 144,974

F8 · price: Represents VWAP of sales of 1,794 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $32.22 to $33.1251.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062608 · tm2614687-4_4seq1.xml · nonDerivative · entry 5

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 144,974

F7 · price: Represents VWAP of sales of 1,265 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $31.21 to $32.15.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062608 · tm2614687-4_4seq1.xml · nonDerivative · entry 4

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 144,974

F6 · price: Represents VWAP of sales of 3,099 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $30.1332 to $31.1212.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062608 · tm2614687-4_4seq1.xml · nonDerivative · entry 3

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 144,974

F5 · price: Represents VWAP of purchases of 701 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $35.4481 to $35.91.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062608 · tm2614687-4_4seq1.xml · nonDerivative · entry 2

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 144,974

F4 · price: Represents VWAP of purchases of 1,276 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $33.97 to $34.90.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062608 · tm2614687-4_4seq1.xml · nonDerivative · entry 1

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 144,974

F1 · price: Represents volume-weighted average price ("VWAP") of purchases of 26 shares of common stock ("Common Stock"), par value $0.0001 per share, of Sensei Biotherapeutics, Inc. (the "Company") on April 2, 2026 at prices ranging from $32.90 to $33.62. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting persons will provide full information regarding the number of shares purchased or sold by the reporting person at each separate price within each range represented by a VWAP disclosed herein.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 17

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 147,731

F19 · price: Represents VWAP of sales of 46 shares of the Company's Common Stock on April 1, 2026 at prices ranging from $34.5271 to $35.3850.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 16

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 147,731

F18 · price: Represents sales of 1,104 shares of the Company's Common Stock on April 1, 2026 at $31.52 per share.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 15

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 147,731

F17 · price: Represents VWAP of purchases of 3,401 shares of the Company's Common Stock on April 1, 2026 at prices ranging from $35.06 to $35.90.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 14

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 147,731

F16 · price: Represents VWAP of purchases of 1,613 shares of the Company's Common Stock on April 1, 2026 at prices ranging from $34.04 to $34.98.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 13

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 147,731

F15 · price: Represents VWAP of purchases of 1,161 shares of the Company's Common Stock on April 1, 2026 at prices ranging from $31.52 to $32.50.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 12

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 146,657

F14 · price: Represents sales of 87 shares of the Company's Common Stock on March 31, 2026 at $31.52 per share.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 11

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 146,657

F13 · price: Represents sales of 5 shares of the Company's Common Stock on March 31, 2026 at $28.4050 per share.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 10

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 146,657

F12 · price: Represents sales of 57 shares of the Company's Common Stock on March 31, 2026 at $27.1147 per share.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 9

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 146,657

F11 · price: Represents VWAP of sales of 1,251 shares of the Company's Common Stock on March 31, 2026 at prices ranging from $25.13 to $25.45.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 8

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 146,657

F10 · price: Represents VWAP of sales of 191 shares of the Company's Common Stock on March 31, 2026 at prices ranging from $23.91 to $24.6089.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 7

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 146,657

F9 · price: Represents VWAP of purchases of 411 shares of the Company's Common Stock on March 31, 2026 at prices ranging from $32.4343 to $32.91.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 6

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 146,657

F8 · price: Represents VWAP of purchases of 1,957 shares of the Company's Common Stock on March 31, 2026 at prices ranging from $31.215 to $31.17.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 5

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 146,657

F7 · price: Represents VWAP of purchases of 186 shares of the Company's Common Stock on March 31, 2026 at prices ranging from $30.1693 to $30.73.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 4

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 146,657

F6 · price: Represents VWAP of purchases of 17 shares of the Company's Common Stock on March 31, 2026 at prices ranging from $27.525 to $28.405.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 3

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 146,657

F5 · price: Represents VWAP of purchases of 1,048 shares of the Company's Common Stock on March 31, 2026 at prices ranging from $26.2587 to $27.1994.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 2

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 146,657

F4 · price: Represents VWAP of purchases of 1,770 shares of the Company's Common Stock on March 31, 2026 at prices ranging from $25.13 to $26.12.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062605 · tm2614687-3_4seq1.xml · nonDerivative · entry 1

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 146,657

F1 · price: Represents volume-weighted average price ("VWAP") of purchases of 616 shares of common stock ("Common Stock"), par value $0.0001 per share, of Sensei Biotherapeutics, Inc. (the "Company") on March 31, 2026 at prices ranging from $23.91 to $24.90. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting persons will provide full information regarding the number of shares purchased or sold by the reporting person at each separate price within each range represented by a VWAP disclosed herein.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 17

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 145,678

F19 · price: Represents sales of 370 shares of the Company's Common Stock on March 30, 2026 at $27.68 per share.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 16

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 145,678

F18 · price: Represents VWAP of sales of 518 shares of the Company's Common Stock on March 30, 2026 at prices ranging from $25.13 to $26.0734.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 15

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 145,678

F17 · price: Represents purchases of 370 shares of the Company's Common Stock on March 30, 2026 at $27.68 per share.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 14

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 145,678

F16 · price: Represents VWAP of purchases of 1,176 shares of the Company's Common Stock on March 30, 2026 at prices ranging from $26.50 to $26.90.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 13

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 145,678

F15 · price: Represents VWAP of purchases of 4,995 shares of the Company's Common Stock on March 30, 2026 at prices ranging from $25.50 to $26.48.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 12

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 145,678

F14 · price: Represents VWAP of purchases of 2,992 shares of the Company's Common Stock on March 30, 2026 at prices ranging from $24.495 to $25.1856.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 11

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 142,360

F13 · price: Represents VWAP of sales of 36 shares of the Company's Common Stock on March 27, 2026 at prices ranging from $27.2322 to $27.68.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 10

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 142,360

F12 · price: Represents VWAP of sales of 469 shares of the Company's Common Stock on March 27, 2026 at prices ranging from $26.21 to $26.95.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 9

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 142,360

F11 · price: Represents VWAP of purchases of 294 shares of the Company's Common Stock on March 27, 2026 at prices ranging from $28.10 to $28.60.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 8

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 142,360

F10 · price: Represents VWAP of purchases of 4,384 shares of the Company's Common Stock on March 27, 2026 at prices ranging from $26.9750 to $27.68.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 7

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 142,360

F9 · price: Represents VWAP of purchases of 10,643 shares of the Company's Common Stock on March 27, 2026 at prices ranging from $25.9197 to $26.88.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 6

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 131,370

F8 · price: Represents VWAP of sales of 1,274 shares of the Company's Common Stock on March 26, 2026 at prices ranging from $28.07 to $28.7651.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 5

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 131,370

F7 · price: Represents VWAP of sales of 583 shares of the Company's Common Stock on March 26, 2026 at prices ranging from $26.68 to $27.4650.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 4

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 131,370

F6 · price: Represents VWAP of purchases of 1,025 shares of the Company's Common Stock on March 26, 2026 at prices ranging from $29.79 to $30.105.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 3

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 131,370

F5 · price: Represents VWAP of purchases of 2,601 shares of the Company's Common Stock on March 26, 2026 at prices ranging from $28.7072 to $29.51.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 2

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 131,370

F4 · price: Represents VWAP of purchases of 1,327 shares of the Company's Common Stock on March 26, 2026 at prices ranging from $27.70 to $28.4163.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0001104659-26-062603 · tm2614687-2_4seq1.xml · nonDerivative · entry 1

MILLENNIUM MANAGEMENT LLC · CIK 0001273087 · 10% owner

ICS OPPORTUNITIES II LLC · CIK 0001783647 · 10% owner

MILLENNIUM GROUP MANAGEMENT LLC · CIK 0001446830 · 10% owner

ENGLANDER ISRAEL A · CIK 0001017456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 131,370

F1 · price: Represents volume-weighted average price ("VWAP") of purchases of 778 shares of common stock ("Common Stock"), par value $0.0001 per share, of Sensei Biotherapeutics, Inc. (the "Company") on March 26, 2026 at prices ranging from $26.66 to $27.62. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting persons will provide full information regarding the number of shares purchased or sold by the reporting person at each separate price within each range represented by a VWAP disclosed herein.

F2 · balance_after: In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.

F3 · ownership.nature: The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.

SEC source: 0002111813-26-000004 · form4-02202026_020201.xml · derivative · entry 4

Parikh Anand Kiran · CIK 0002111813 · Director · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,239,305

Underlying: Common Stock · 1,239,305 shares

Expires 2036-02-18

F8 · derivative.exercise_date: 25% of the shares shall vest on February 19, 2027, and the remaining shares shall vest in 36 equal monthly installments thereafter.

SEC source: 0002111813-26-000004 · form4-02202026_020201.xml · derivative · entry 3

Parikh Anand Kiran · CIK 0002111813 · Director · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,673

Underlying: Common Stock · 56,673 shares

Expires 2032-09-14

F6 · kind: Received in exchange for stock options to acquire an aggregate of 284,320 shares of Faeth common stock with an exercise price of $0.23 per share pursuant to the Merger Agreement.

F6 · price: Received in exchange for stock options to acquire an aggregate of 284,320 shares of Faeth common stock with an exercise price of $0.23 per share pursuant to the Merger Agreement.

F7 · derivative.exercise_date: Immediately exercisable.

SEC source: 0002111813-26-000004 · form4-02202026_020201.xml · derivative · entry 2

Parikh Anand Kiran · CIK 0002111813 · Director · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 92,533

Underlying: Common Stock · 92,533 shares

Expires 2032-09-14

F4 · kind: Received in exchange for a stock option to acquire 464,222 shares of Faeth common stock with an exercise price of $0.23 per share pursuant to the Merger Agreement.

F4 · price: Received in exchange for a stock option to acquire 464,222 shares of Faeth common stock with an exercise price of $0.23 per share pursuant to the Merger Agreement.

F5 · derivative.exercise_date: Beginning August 1, 2022, the shares subject to the option vest in a series of forty-eight (48) successive equal monthly installments.

SEC source: 0002111813-26-000004 · form4-02202026_020201.xml · derivative · entry 1

Parikh Anand Kiran · CIK 0002111813 · Director · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 809,822

Underlying: Common Stock · 809.822 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of Series B Non-Voting Convertible Preferred Stock (the "Series B Preferred Stock") is convertible into 1,000 shares of Common Stock of Sensei Biotherapeutics, Inc. (the "Company"). The Preferred Stock has no expiration date.

F2 · kind: Received in exchange for 4,062,777 shares of common stock of Faeth Holdings Therapeutics, Inc. ("HoldCo") pursuant to an Agreement and Plan of Merger, dated February 17, 2026 (the "Merger Agreement"), by and among the Company, Sapphire First Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of the Company ("First Merger Sub"), Sapphire Second Merger Sub, LLC, a Delaware limited liability company and wholly owned subsidiary of the Company ("Second Merger Sub"), HoldCo and Faeth Therapeutics, LLC, a Delaware limited liability company and wholly owned subsidiary of HoldCo ("Faeth").

F3 · kind: Under the terms of the Merger Agreement, on February 17, 2026, First Merger Sub merged with and into HoldCo, with HoldCo surviving the first merger as a wholly owned subsidiary of the Company, and immediately following the first merger, HoldCo merged with and into Second Merger Sub, with Second Merger Sub surviving the second merger as a wholly owned subsidiary of the Company (such mergers, the "Merger"). Upon the closing of the Merger, shares of outstanding common stock of HoldCo were converted into the right to receive shares of the Company's Series B Preferred Stock in accordance with the Merger Agreement. Subject to certain conditions set forth in the Certificate of Designation of Preferences, Rights and Limitations of the Series B Preferred Stock, each share of Series B Preferred Stock is convertible into 1,000 shares of the Company's Common Stock ("Common Stock").

F2 · price: Received in exchange for 4,062,777 shares of common stock of Faeth Holdings Therapeutics, Inc. ("HoldCo") pursuant to an Agreement and Plan of Merger, dated February 17, 2026 (the "Merger Agreement"), by and among the Company, Sapphire First Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of the Company ("First Merger Sub"), Sapphire Second Merger Sub, LLC, a Delaware limited liability company and wholly owned subsidiary of the Company ("Second Merger Sub"), HoldCo and Faeth Therapeutics, LLC, a Delaware limited liability company and wholly owned subsidiary of HoldCo ("Faeth").

F3 · price: Under the terms of the Merger Agreement, on February 17, 2026, First Merger Sub merged with and into HoldCo, with HoldCo surviving the first merger as a wholly owned subsidiary of the Company, and immediately following the first merger, HoldCo merged with and into Second Merger Sub, with Second Merger Sub surviving the second merger as a wholly owned subsidiary of the Company (such mergers, the "Merger"). Upon the closing of the Merger, shares of outstanding common stock of HoldCo were converted into the right to receive shares of the Company's Series B Preferred Stock in accordance with the Merger Agreement. Subject to certain conditions set forth in the Certificate of Designation of Preferences, Rights and Limitations of the Series B Preferred Stock, each share of Series B Preferred Stock is convertible into 1,000 shares of the Company's Common Stock ("Common Stock").

F1 · derivative.exercise_date: Each share of Series B Non-Voting Convertible Preferred Stock (the "Series B Preferred Stock") is convertible into 1,000 shares of Common Stock of Sensei Biotherapeutics, Inc. (the "Company"). The Preferred Stock has no expiration date.

F1 · derivative.expiration_date: Each share of Series B Non-Voting Convertible Preferred Stock (the "Series B Preferred Stock") is convertible into 1,000 shares of Common Stock of Sensei Biotherapeutics, Inc. (the "Company"). The Preferred Stock has no expiration date.