SEER

SEC source: 0001209191-21-061101 · doc4.xml · nonDerivative · entry 2

OSTADAN OMEAD · CIK 0001642678 · Director · President & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 388,844

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 10, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.98 to $32.97, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) and (3) to this Form 4.

SEC source: 0001209191-21-061101 · doc4.xml · nonDerivative · entry 1

OSTADAN OMEAD · CIK 0001642678 · Director · President & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 397,448

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001209191-21-059374 · doc4.xml · derivative · entry 4

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 576,547

Underlying: Class A Common Stock · 10,000 shares

Expires 2030-04-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: The shares underlying the option are subject to an early exercise provision and are immediately exercisable. One-fourth of the shares underlying the option vested on April 1, 2021 and 1/48th of the shares vest monthly thereafter.

SEC source: 0001209191-21-059374 · doc4.xml · nonDerivative · entry 3

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 230,966

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2021.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.86 to $34.61, inclusive.

SEC source: 0001209191-21-059374 · doc4.xml · nonDerivative · entry 2

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 236,002

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.86 to $33.84, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) and (3) to this Form 4.

SEC source: 0001209191-21-059374 · doc4.xml · nonDerivative · entry 1

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 240,966

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001209191-22-009569 · doc5a.xml · derivative · entry 2

Farokhzad Omid · CIK 0001586852 · Director · CEO and Chair of the Board · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 2,117,138

Underlying: Class A Common Stock · 134,579 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of Class B Common Stock is convertible into Class A Common Stock on a one-to-one basis at the reporting person's election at any time until December 8, 2025.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible into Class A Common Stock on a one-to-one basis at the reporting person's election at any time until December 8, 2025.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible into Class A Common Stock on a one-to-one basis at the reporting person's election at any time until December 8, 2025.

F2 · ownership.nature: The reported shares are held of record by SAF-BND Trust for which the reporting person's spouse serves as trustee. The reporting person disclaims beneficial ownership of these securities, except to the extent of any pecuniary interest therein, and the filing of this report is not an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-22-009569 · doc5a.xml · derivative · entry 1

Farokhzad Omid · CIK 0001586852 · Director · CEO and Chair of the Board · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 134,579

Underlying: Class A Common Stock · 134,579 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of Class B Common Stock is convertible into Class A Common Stock on a one-to-one basis at the reporting person's election at any time until December 8, 2025.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible into Class A Common Stock on a one-to-one basis at the reporting person's election at any time until December 8, 2025.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible into Class A Common Stock on a one-to-one basis at the reporting person's election at any time until December 8, 2025.

SEC source: 0001209191-21-056623 · doc4.xml · derivative · entry 5

OSTADAN OMEAD · CIK 0001642678 · Director · President & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 345,481

Underlying: Class A Common Stock · 20,000 shares

Expires 2030-03-05

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: The shares underlying the option are subject to an early exercise provision and are immediately exercisable. The shares underlying the option vest in 48 equal monthly installments beginning on April 6, 2020.

SEC source: 0001209191-21-056623 · doc4.xml · nonDerivative · entry 4

OSTADAN OMEAD · CIK 0001642678 · Director · President & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 377,448

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 10, 2021.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $41.65 to $42.14, inclusive.

SEC source: 0001209191-21-056623 · doc4.xml · nonDerivative · entry 3

OSTADAN OMEAD · CIK 0001642678 · Director · President & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 379,707

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 10, 2021.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $40.64 to $41.63, inclusive.

SEC source: 0001209191-21-056623 · doc4.xml · nonDerivative · entry 2

OSTADAN OMEAD · CIK 0001642678 · Director · President & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 392,327

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 10, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.64 to $40.62, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2), (3) and (4) to this Form 4.

SEC source: 0001209191-21-056623 · doc4.xml · nonDerivative · entry 1

OSTADAN OMEAD · CIK 0001642678 · Director · President & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 397,448

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001209191-21-054521 · doc4.xml · derivative · entry 4

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 586,547

Underlying: Class A Common Stock · 10,000 shares

Expires 2030-04-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: The shares underlying the option are subject to an early exercise provision and are immediately exercisable. One-fourth of the shares underlying the option vested on April 1, 2021 and 1/48th of the shares vest monthly thereafter.

SEC source: 0001209191-21-054521 · doc4.xml · nonDerivative · entry 3

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 230,966

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2021.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.94 to $40.12, inclusive.

SEC source: 0001209191-21-054521 · doc4.xml · nonDerivative · entry 2

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 231,667

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.94 to $39.93, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) and (3) to this Form 4.

SEC source: 0001209191-21-054521 · doc4.xml · nonDerivative · entry 1

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 240,966

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001209191-21-049672 · doc4.xml · derivative · entry 4

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 596,547

Underlying: Class A Common Stock · 10,000 shares

Expires 2030-04-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: The shares underlying the option are subject to an early exercise provision and are immediately exercisable. One-fourth of the shares underlying the option vested on April 1, 2021 and 1/48th of the shares vest monthly thereafter.

SEC source: 0001209191-21-049672 · doc4.xml · nonDerivative · entry 3

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 230,966

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2021.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.41 to $31.86, inclusive.

SEC source: 0001209191-21-049672 · doc4.xml · nonDerivative · entry 2

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 233,063

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.41 to $31.40, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) and (3) to this Form 4.

SEC source: 0001209191-21-049672 · doc4.xml · nonDerivative · entry 1

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 240,966

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001209191-21-045423 · doc4.xml · derivative · entry 5

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 606,547

Underlying: Class A Common Stock · 10,000 shares

Expires 2030-04-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: The shares underlying the option are subject to an early exercise provision and are immediately exercisable. One-fourth of the shares underlying the option vested on April 1, 2021 and 1/48th of the shares vest monthly thereafter.

SEC source: 0001209191-21-045423 · doc4.xml · nonDerivative · entry 4

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 230,966

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2021.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.10 to $32.99, inclusive.

SEC source: 0001209191-21-045423 · doc4.xml · nonDerivative · entry 3

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 233,477

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2021.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.06 to $32.05, inclusive.

SEC source: 0001209191-21-045423 · doc4.xml · nonDerivative · entry 2

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 235,977

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.03 to $31.01, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2), (3) and (4) to this Form 4.

SEC source: 0001209191-21-045423 · doc4.xml · nonDerivative · entry 1

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 240,966

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001209191-21-042512 · doc4.xml · derivative · entry 1

MCGUIRE TERRANCE · CIK 0001117003 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,000

Underlying: Class A Common Stock · 15,000 shares

Expires 2031-06-17

F1 · derivative.exercise_date: Shares subject to the option vest on the earlier of (i) June 17, 2022 or (ii) the day prior to the date of the Issuer's next annual meeting of stockholders.

SEC source: 0001209191-21-042523 · doc4.xml · derivative · entry 1

SINGER DAVID B · CIK 0001240366 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,000

Underlying: Class A Common Stock · 15,000 shares

Expires 2031-06-17

F1 · derivative.exercise_date: Shares subject to the option vest on the earlier of (i) June 17, 2022 or (ii) the day prior to the date of the Issuer's next annual meeting of stockholders.

F2 · ownership.direct: The reporting person is a Managing Partner of Maverick Capital Ventures, LLC (Maverick Ventures), the general partner of Maverick Ventures Investment Fund, L.P. and Maverick Advisors Fund, L.P. The reporting person is deemed to hold the reported stock option for the benefit of the Maverick Ventures, which entity is entitled to the shares of Class A Common Stock issued upon exercise. Maverick Ventures may be deemed the indirect beneficial owner of this stock option, and the reporting person may be deemed the indirect beneficial owner of the option through his indirect interest in Maverick Ventures. The reporting person disclaims beneficial ownership of the stock option except to the extent of his pecuniary interest therein.

SEC source: 0001209191-21-042507 · doc4.xml · derivative · entry 1

LANGER ROBERT · CIK 0001239757 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,000

Underlying: Class A Common Stock · 15,000 shares

Expires 2031-06-17

F1 · derivative.exercise_date: Shares subject to the option vest on the earlier of (i) June 17, 2022 or (ii) the day prior to the date of the Issuer's next annual meeting of stockholders.

SEC source: 0001209191-21-042503 · doc4.xml · derivative · entry 1

Hallal David · CIK 0001457477 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,000

Underlying: Class A Common Stock · 15,000 shares

Expires 2031-06-17

F1 · derivative.exercise_date: Shares subject to the option vest on the earlier of (i) June 17, 2022 or (ii) the day prior to the date of the Issuer's next annual meeting of stockholders.

SEC source: 0001209191-21-042500 · doc4.xml · derivative · entry 1

FRIEDMAN CATHY · CIK 0001411874 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,000

Underlying: Class A Common Stock · 15,000 shares

Expires 2031-06-17

F1 · derivative.exercise_date: Shares subject to the option vest on the earlier of (i) June 17, 2022 or (ii) the day prior to the date of the Issuer's next annual meeting of stockholders.

SEC source: 0001062993-21-005889 · form4.xml · derivative · entry 1

Maverick Capital Ventures, LLC · CIK 0001632173 · Director

Maverick Ventures Investment Fund, L.P. · CIK 0001632191 · Director

Maverick Advisors Fund, L.P. · CIK 0001632167 · Director

AINSLIE LEE S III · CIK 0001286654 · Director

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 15,000

Underlying: Class A Common Stock · 15,000 shares

Expires 2031-06-17

F1 · derivative.exercise_date: Shares subject to the stock options vest on the earlier of (i) June 17, 2021 or (ii) the day prior to the date of the Issuer's next annual meeting of stockholders.

F2 · ownership.nature: The stock options reported on this Form 4 were awarded to David Singer, in connection with his membership on the board of directors of the Issuer. Mr. Singer and Lee S. Ainslie III are Managing Partners of Maverick Capital Ventures, LLC ("Maverick Ventures"), the general partner of Maverick Ventures Investment Fund, L.P. and Maverick Advisors Fund, L.P. Pursuant to the policies of Maverick Ventures, Mr. Singer holds the reported stock options for the benefit of clients of Maverick Capital, Ltd. and its affiliates. The reporting entities and individuals disclaim beneficial ownership of the reported securities of the Issuer except to the extent of any pecuniary interest therein.

SEC source: 0001178913-21-002059 · zk2126185.xml · nonDerivative · entry 2

aMoon Growth Fund Limited Partnership · CIK 0001744099 · 10% owner

Schindel Yair Chaim · CIK 0001823758 · shareholder of 10% holder

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 810,961

F2 · ownership.nature: The reported shares are held of record by aMoon Co-Investment SPV I, L.P. ("aMoon Co-Investment"). aMoon Growth Fund G.P. is the sole General Partner of aMoon Co-Investment and aMoon General Partner is the sole General Partner of aMoon Growth Fund G.P. Dr. Schindel is the sole shareholder of aMoon General Partner. By virtue of such relationships, aMoon Growth Fund G.P., aMoon General Partner and Dr. Schindel may be deemed to have shared voting and investment power with respect to the shares held of record by aMoon Co-Investment. Each of aMoon Growth Fund G.P., aMoon General Partner and Dr. Schindel disclaims beneficial ownership of the shares held by aMoon Co-Investment except to the extent of its or his pecuniary interest therein, if any.

SEC source: 0001178913-21-002059 · zk2126185.xml · nonDerivative · entry 1

aMoon Growth Fund Limited Partnership · CIK 0001744099 · 10% owner

Schindel Yair Chaim · CIK 0001823758 · shareholder of 10% holder

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,112,235

F1 · ownership.direct: The reported shares are held of record by aMoon Growth Fund Limited Partnership ("aMoon Growth Fund"). aMoon Growth Fund G.P. Limited Partnership ("aMoon Growth Fund G.P.") is the sole General Partner of aMoon Growth Fund and aMoon General Partner Ltd. ("aMoon General Partner") is the sole General Partner of aMoon Growth Fund G.P. Dr. Yair Schindel is the sole shareholder of aMoon General Partner. By virtue of such relationships, aMoon Growth Fund G.P., aMoon General Partner and Dr. Schindel may be deemed to have shared voting and investment power with respect to the shares held of record by aMoon Growth Fund. Each of aMoon Growth Fund G.P., aMoon General Partner and Dr. Schindel disclaims beneficial ownership of the shares held by aMoon Growth Fund except to the extent of its or his pecuniary interest therein, if any.

SEC source: 0001209191-21-038206 · doc4.xml · derivative · entry 3

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 616,547

Underlying: Class A Common Stock · 10,000 shares

Expires 2030-04-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: The shares underlying the option are subject to an early exercise provision and are immediately exercisable. One-fourth of the shares underlying the option vested on April 1, 2021 and 1/48th of the shares vest monthly thereafter.

SEC source: 0001209191-21-038206 · doc4.xml · nonDerivative · entry 2

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 230,966

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.00 to $30.51, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

SEC source: 0001209191-21-038206 · doc4.xml · nonDerivative · entry 1

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 240,966

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001209191-21-012585 · doc4.xml · derivative · entry 7

Farokhzad Omid · CIK 0001586852 · Director · CEO and Chair of the Board · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 2,251,717

Underlying: Class A Common Stock · 135,611 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of Class B Common Stock is convertible at any time into Class A Common Stock on a one-to-one basis at the reporting person's election and has no expiration date.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time into Class A Common Stock on a one-to-one basis at the reporting person's election and has no expiration date.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time into Class A Common Stock on a one-to-one basis at the reporting person's election and has no expiration date.

F3 · ownership.nature: The reported shares are held of record by SAF-BND Trust for which the reporting person's spouse serves as trustee. The reporting person disclaims beneficial ownership of these securities, except to the extent of any pecuniary interest therein, and the filing of this report is not an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-21-012585 · doc4.xml · derivative · entry 6

Farokhzad Omid · CIK 0001586852 · Director · CEO and Chair of the Board · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,303,478

Underlying: Class A Common Stock · 219,130 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of Class B Common Stock is convertible at any time into Class A Common Stock on a one-to-one basis at the reporting person's election and has no expiration date.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time into Class A Common Stock on a one-to-one basis at the reporting person's election and has no expiration date.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time into Class A Common Stock on a one-to-one basis at the reporting person's election and has no expiration date.

F2 · ownership.nature: The reported shares are held of record by Dynamics Group LLC for which the reporting person serves as the sole member.

SEC source: 0001209191-21-012585 · doc4.xml · nonDerivative · entry 4

Farokhzad Omid · CIK 0001586852 · Director · CEO and Chair of the Board · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F3 · ownership.nature: The reported shares are held of record by SAF-BND Trust for which the reporting person's spouse serves as trustee. The reporting person disclaims beneficial ownership of these securities, except to the extent of any pecuniary interest therein, and the filing of this report is not an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-21-012585 · doc4.xml · nonDerivative · entry 3

Farokhzad Omid · CIK 0001586852 · Director · CEO and Chair of the Board · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 135,611

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Class B Common Stock is convertible at any time into Class A Common Stock on a one-to-one basis at the reporting person's election and has no expiration date.

F3 · ownership.nature: The reported shares are held of record by SAF-BND Trust for which the reporting person's spouse serves as trustee. The reporting person disclaims beneficial ownership of these securities, except to the extent of any pecuniary interest therein, and the filing of this report is not an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-21-012585 · doc4.xml · nonDerivative · entry 2

Farokhzad Omid · CIK 0001586852 · Director · CEO and Chair of the Board · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 135,615

F2 · ownership.nature: The reported shares are held of record by Dynamics Group LLC for which the reporting person serves as the sole member.

SEC source: 0001209191-21-012585 · doc4.xml · nonDerivative · entry 1

Farokhzad Omid · CIK 0001586852 · Director · CEO and Chair of the Board · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 354,745

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Class B Common Stock is convertible at any time into Class A Common Stock on a one-to-one basis at the reporting person's election and has no expiration date.

F2 · ownership.nature: The reported shares are held of record by Dynamics Group LLC for which the reporting person serves as the sole member.

SEC source: 0001209191-21-012220 · doc4.xml · derivative · entry 1

Ronaghi Mostafa · CIK 0001441876 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,939

Underlying: Class A Common Stock · 27,939 shares

Expires 2031-02-16

F1 · derivative.exercise_date: Shares subject to the option vest in 36 equal monthly installments beginning on March 16, 2021.

SEC source: 0000899243-21-004899 · doc4.xml · nonDerivative · entry 1

Invus Public Equities, L.P. · CIK 0001340097 · 10% owner

Artal Treasury Ltd · CIK 0001766952 · 10% owner

Artal International S.C.A. · CIK 0001218180 · 10% owner

Artal International Management S.A. · CIK 0001522131 · 10% owner

Artal Group S.A. · CIK 0001053906 · 10% owner

Westend S.A. · CIK 0001283968 · 10% owner

Wittouck Amaury · CIK 0001841311 · 10% owner

Stichting Administratiekantoor Westend · CIK 0001460840 · 10% owner

Invus Public Equities Advisors, LLC · CIK 0001340096 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,588,366

F1 · price: This amount represents the $67.00 secondary public offering price per share of Class A common stock of Seer, Inc., less the underwriting discount of $2.847 per share for shares sold pursuant to an underwritten public offering.

F2 · ownership.direct: The shares are held directly by Invus Public Equities, L.P. The general partner of Invus Public Equities, L.P. is Invus Public Equities Advisors, LLC. Artal Treasury Ltd is the managing member of Invus Public Equities Advisors, LLC. Artal Treasury Ltd is a wholly owned subsidiary of the Geneva branch of Artal International S.C.A. The managing partner of Artal International S.C.A. is Artal International Management S.A., which is a wholly owned subsidiary of Artal Group S.A. Westend S.A. is the parent company of Artal Group, S.A., and the majority stockholder of Westend S.A. is Stichting Administratiekantoor Westend ("Stichting"). Mr. Amaury Wittouck is the sole member of the board of Stichting.

F3 · ownership.direct: Each of the Reporting Persons, other than Invus Public Equities L.P., disclaims beneficial ownership of the securities held by the other Reporting Persons, except to the extent of such reporting person's pecuniary interest therein, and, pursuant to Rule 16a-1(a)(4) under the Exchange Act, each of the reporting persons (other than to the extent it directly holds securities reported herein) states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 of the Exchange Act or for any other purpose.

SEC source: 0001628280-21-001448 · wf-form4_161240715862934.xml · derivative · entry 4

OSTADAN OMEAD · CIK 0001642678 · Director · President & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,250

Underlying: Class A Common Stock · 41,250 shares

Expires 2031-02-01

F4 · derivative.exercise_date: One-fourth of the shares vest on February 1, 2022 and the remaining shares vest in 36 equal monthly installments thereafter.

SEC source: 0001628280-21-001448 · wf-form4_161240715862934.xml · nonDerivative · entry 2

OSTADAN OMEAD · CIK 0001642678 · Director · President & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 377,448

F2 · shares: The reported shares are represented by RSUs, which vest in four equal annual installments beginning on February 1, 2022.

SEC source: 0001628280-21-001447 · wf-form4_161240713251524.xml · derivative · entry 4

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,125

Underlying: Class A Common Stock · 34,125 shares

Expires 2031-02-01

F4 · derivative.exercise_date: One-fourth of the shares vest on February 1, 2022 and the remaining shares vest in 36 equal monthly installments thereafter.

SEC source: 0001628280-21-001447 · wf-form4_161240713251524.xml · nonDerivative · entry 2

Horn David R. · CIK 0001834217 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 230,966

F2 · shares: The reported shares are represented by RSUs, which vest in four equal annual installments beginning on February 1, 2022.

SEC source: 0001628280-21-001446 · wf-form4_161240711241180.xml · derivative · entry 13

Farokhzad Omid · CIK 0001586852 · Director · CEO and Chair of the Board · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 87,000

Underlying: Class A Common Stock · 87,000 shares

Expires 2031-02-01

F7 · derivative.exercise_date: One-fourth of the shares vest on February 1, 2022 and the remaining shares vest in 36 equal monthly installments thereafter.