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Nasdaq · USD

NKTX

Nkarta, Inc.

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6346
SEC CIK
0001787400
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218

Last 12 months

Inside the activity.

0 purchase rows · 3 sale rows

Disclosed non-derivative P/S rows, by transaction month. Includes amendments and private transactions.
Monthly counts
MonthPurchasesSales
Nov 202500
Dec 202500
Jan 202602
Feb 202600
Mar 202600
Apr 202600
May 202600
Jun 202601
Jul 202600
Aug 202600
Sep 202600
Oct 202600

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateOwner / reported roleActivity / securityShares / unitsReported priceReported valueDetails
June 18, 2026 Filed Jun 22, 2026 20:05 UTC
HASTINGS PAUL JDirector · Chief Executive Officer
SaleCommon Stock 1,776 $2.71 $4,812.96
Disclosure

SEC source: 0001193125-26-277507 · ownership.xml · nonDerivative · entry 1

HASTINGS PAUL J · CIK 0001309702 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 390,247

F1 · shares: Represents shares sold to satisfy tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units and does not represent a discretionary transaction by the Reporting Person.

F2 · balance_after: Includes 2,000 shares acquired under the Issuer's 2020 Employee Stock Purchase Plan on May 31, 2026.

Read SEC document
June 10, 2026 Filed Jun 11, 2026 20:11 UTC GrantStock Option (right to buy) · Derivative 37,000 $0.00 Strike: $2.46 $0.00
Disclosure

SEC source: 0001193125-26-267538 · ownership.xml · derivative · entry 1

Vratsanos George · CIK 0002025731 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,000

Underlying: Common Stock · 37,000 shares

Expires 2036-06-09

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 10, 2027 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

Read SEC document
June 10, 2026 Filed Jun 11, 2026 20:08 UTC GrantStock Option (right to buy) · Derivative 37,000 $0.00 Strike: $2.46 $0.00
Disclosure

SEC source: 0001193125-26-267524 · ownership.xml · derivative · entry 1

Scheiner Zachary · CIK 0001816523 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,000

Underlying: Common Stock · 37,000 shares

Expires 2036-06-09

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 10, 2027 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

F2 · ownership.direct: Under the Reporting Person's arrangement with RA Capital Management, L.P. (the "Adviser"), the Reporting Person holds the stock option for the benefit of the RA Capital Healthcare Fund, L.P. (the "Fund") and the RA Capital Nexus Fund, L.P. (the "Nexus Fund"). The Reporting Person is obligated to turn over to the Adviser any net cash or stock received upon exercise of the stock option, which will offset advisory fees owed by the Fund and the Nexus Fund to the Adviser. The Reporting Person therefore disclaims beneficial ownership of the stock option and underlying common stock.

Read SEC document
June 10, 2026 Filed Jun 11, 2026 20:06 UTC GrantStock Option (right to buy) · Derivative 37,000 $0.00 Strike: $2.46 $0.00
Disclosure

SEC source: 0001193125-26-267517 · ownership.xml · derivative · entry 1

Thedinga Angela · CIK 0001804588 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,000

Underlying: Common Stock · 37,000 shares

Expires 2036-06-09

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 10, 2027 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

Read SEC document
June 10, 2026 Filed Jun 11, 2026 20:07 UTC GrantStock Option (right to buy) · Derivative 37,000 $0.00 Strike: $2.46 $0.00
Disclosure

SEC source: 0001193125-26-267521 · ownership.xml · derivative · entry 1

PATTERSON LEONE D · CIK 0001233539 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,000

Underlying: Common Stock · 37,000 shares

Expires 2036-06-09

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 10, 2027 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

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June 10, 2026 Filed Jun 11, 2026 20:30 UTC
RA CAPITAL MANAGEMENT, L.P.Director · 10% owner
RA Capital Healthcare Fund LPDirector · 10% owner
Kolchinsky PeterDirector · 10% owner
Shah Rajeev M.Director · 10% owner
GrantStock Option (right to buy) · Derivative 37,000 $0.00 Strike: $2.46 $0.00
Disclosure

SEC source: 0001231919-26-000621 · form4-06112026_080618.xml · derivative · entry 1

RA CAPITAL MANAGEMENT, L.P. · CIK 0001346824 · Director · 10% owner

RA Capital Healthcare Fund LP · CIK 0001315082 · Director · 10% owner

RA Capital Nexus Fund, L.P. · CIK 0001780117 · Director

Kolchinsky Peter · CIK 0001384859 · Director · 10% owner

Shah Rajeev M. · CIK 0001619841 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 37,000

Underlying: Common Stock · 37,000 shares

Expires 2036-06-09

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 10, 2027 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award, subject to Dr. Scheiner's continued service through the applicable vesting date. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Dr. Scheiner's separation from service with the Issuer due to the his death or "disability" (as described in the applicable award agreement).

F2 · ownership.nature: RA Capital Management, L.P. (the "Adviser") is the investment manager for RA Capital Healthcare Fund, L.P. (the "Fund") and RA Capital Nexus Fund, L.P. (the "Nexus Fund"). The general partner of the Adviser is RA Capital Management GP, LLC (the "Adviser GP"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. Each of the Adviser, the Adviser GP, the Fund, the Nexus Fund, Dr. Kolchinsky and Mr. Shah disclaims beneficial ownership of any of the reported securities, except to the extent of its or his respective pecuniary interest therein.

F3 · ownership.nature: Under Dr. Scheiner's arrangement with the Adviser, Dr. Scheiner holds the option for the benefit of the Fund and the Nexus Fund. Dr. Scheiner is obligated to turn over to the Adviser any net cash or stock received upon exercise of the option, which will offset advisory fees owed by the Fund and the Nexus Fund to the Adviser. The Reporting Persons therefore disclaim beneficial ownership of the option and underlying common stock.

Read SEC document
June 10, 2026 Filed Jun 11, 2026 20:20 UTC GrantStock Option (right to buy) · Derivative 37,000 $0.00 Strike: $2.46 $0.00
Disclosure

SEC source: 0001193125-26-267601 · ownership.xml · derivative · entry 1

George Simeon · CIK 0001595117 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,000

Underlying: Common Stock · 37,000 shares

Expires 2036-06-09

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 10, 2027 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

Read SEC document
June 10, 2026 Filed Jun 11, 2026 20:07 UTC GrantStock Option (right to buy) · Derivative 37,000 $0.00 Strike: $2.46 $0.00
Disclosure

SEC source: 0001193125-26-267519 · ownership.xml · derivative · entry 1

Dybbs Michael · CIK 0001601264 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,000

Underlying: Common Stock · 37,000 shares

Expires 2036-06-09

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 10, 2027 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

Read SEC document
June 10, 2026 Filed Jun 11, 2026 20:27 UTC GrantStock Option (right to buy) · Derivative 37,000 $0.00 Strike: $2.46 $0.00
Disclosure

SEC source: 0001193125-26-267632 · ownership.xml · derivative · entry 1

Behbahani Ali · CIK 0001613867 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,000

Underlying: Common Stock · 37,000 shares

Expires 2036-06-09

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 10, 2027 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

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January 15, 2026 Filed Jan 20, 2026 17:38 UTC
Mahmood NadirPresident
SaleCommon Stock 5,649 $2.07 $11,693.43
Disclosure

SEC source: 0001193125-26-016862 · ownership.xml · nonDerivative · entry 1

Mahmood Nadir · CIK 0001816598 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 167,727

F1 · shares: Represents shares sold to satisfy tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units and does not represent a discretionary transaction by the Reporting Person.

Read SEC document
January 15, 2026 Filed Jan 20, 2026 22:39 UTC
HASTINGS PAUL JDirector · Chief Executive Officer
SaleCommon Stock 26,046 $2.07 $53,915.22
Disclosure

SEC source: 0001193125-26-016865 · ownership.xml · nonDerivative · entry 1

HASTINGS PAUL J · CIK 0001309702 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 390,023

F1 · shares: Represents shares sold to satisfy tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units and does not represent a discretionary transaction by the Reporting Person.

Read SEC document
January 06, 2026 Filed Jan 8, 2026 17:50 UTC GrantStock Option (right to buy) · Derivative 139,000 $0.00 Strike: $1.93 $0.00
Disclosure

SEC source: 0001193125-26-007898 · ownership.xml · derivative · entry 2

Rose Shawn Marshall · CIK 0002073530 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 139,000

Underlying: Common Stock · 139,000 shares

Expires 2036-01-05

F2 · derivative.exercise_date: This option is scheduled to vest and become exercisable in 48 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following January 14, 2026.

Read SEC document
January 06, 2026 Filed Jan 8, 2026 17:50 UTC GrantCommon Stock 70,000 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-007898 · ownership.xml · nonDerivative · entry 1

Rose Shawn Marshall · CIK 0002073530 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 70,000

F1 · shares: Represents Restricted Stock Units ("RSUs") which vest in four equal annual installments beginning on January 14, 2027. Each RSU represents a contingent right to receive one share of Common Stock of the Issuer.

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January 06, 2026 Filed Jan 8, 2026 17:49 UTC
Mahmood NadirPresident
GrantStock Option (right to buy) · Derivative 160,000 $0.00 Strike: $1.93 $0.00
Disclosure

SEC source: 0001193125-26-007897 · ownership.xml · derivative · entry 2

Mahmood Nadir · CIK 0001816598 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 160,000

Underlying: Common Stock · 160,000 shares

Expires 2036-01-05

F2 · derivative.exercise_date: This option is scheduled to vest and become exercisable in 48 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following January 14, 2026.

Read SEC document
January 06, 2026 Filed Jan 8, 2026 17:49 UTC
Mahmood NadirPresident
GrantCommon Stock 80,000 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-007897 · ownership.xml · nonDerivative · entry 1

Mahmood Nadir · CIK 0001816598 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 173,376

F1 · shares: Represents Restricted Stock Units ("RSUs") which vest in four equal annual installments beginning on January 14, 2027. Each RSU represents a contingent right to receive one share of Common Stock of the Issuer.

Read SEC document
January 06, 2026 Filed Jan 8, 2026 22:48 UTC
HASTINGS PAUL JDirector · Chief Executive Officer
GrantStock Option (right to buy) · Derivative 562,000 $0.00 Strike: $1.93 $0.00
Disclosure

SEC source: 0001193125-26-007896 · ownership.xml · derivative · entry 2

HASTINGS PAUL J · CIK 0001309702 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 562,000

Underlying: Common Stock · 562,000 shares

Expires 2036-01-05

F3 · derivative.exercise_date: This option is scheduled to vest and become exercisable in 48 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following January 14, 2026.

Read SEC document
January 06, 2026 Filed Jan 8, 2026 22:48 UTC
HASTINGS PAUL JDirector · Chief Executive Officer
GrantCommon Stock 94,000 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-007896 · ownership.xml · nonDerivative · entry 1

HASTINGS PAUL J · CIK 0001309702 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 416,069

F1 · shares: Represents Restricted Stock Units ("RSUs") which vest in four equal annual installments beginning on January 14, 2027. Each RSU represents a contingent right to receive one share of Common Stock of the Issuer.

F2 · balance_after: Includes 2,000 shares acquired under the Issuer's 2020 Employee Stock Purchase Plan on November 30, 2025.

Read SEC document
June 23, 2025 Filed Jun 25, 2025 16:00 UTC GrantStock Option (right to buy) · Derivative 500,000 $0.00 Strike: $1.75 $0.00
Disclosure

SEC source: 0000950170-25-089939 · ownership.xml · derivative · entry 1

Rose Shawn Marshall · CIK 0002073530 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 500,000

Underlying: Common Stock · 500,000 shares

Expires 2035-06-22

F1 · derivative.exercise_date: The option is scheduled to vest and become exercisable as to 25% of the shares subject to the grant on July 23, 2026. The remaining portion of the option is scheduled to vest and become exercisable in 36 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following June 23, 2026.

Read SEC document
June 18, 2025 Filed Jun 20, 2025 20:08 UTC
HASTINGS PAUL JDirector · Chief Executive Officer
SaleCommon Stock 1,790 $1.79 $3,204.10
Disclosure

SEC source: 0000950170-25-088501 · ownership.xml · nonDerivative · entry 1

HASTINGS PAUL J · CIK 0001309702 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 320,069

F1 · shares: Represents shares sold to satisfy tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units and does not represent a discretionary transaction by the Reporting Person.

F2 · price: This transaction was executed in multiple trades at prices ranging from $1.76 to $1.79. The price reported above reflects the weighted average price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was effected.

F3 · balance_after: Includes 2,000 shares acquired under the Issuer's 2020 Employee Stock Purchase Plan on May 31, 2025.

Read SEC document
June 05, 2025 Filed Jun 9, 2025 20:05 UTC GrantStock Option (right to buy) · Derivative 46,000 $0.00 Strike: $1.83 $0.00
Disclosure

SEC source: 0000950170-25-083707 · ownership.xml · derivative · entry 1

Vratsanos George · CIK 0002025731 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,000

Underlying: Common Stock · 46,000 shares

Expires 2035-06-04

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 5, 2026 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

Read SEC document
June 05, 2025 Filed Jun 9, 2025 16:08 UTC
Mahmood NadirPresident
GrantStock Option (right to buy) · Derivative 123,500 $0.00 Strike: $1.83 $0.00
Disclosure

SEC source: 0000950170-25-083718 · ownership.xml · derivative · entry 1

Mahmood Nadir · CIK 0001816598 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 123,500

Underlying: Common Stock · 123,500 shares

Expires 2035-06-04

F1 · derivative.exercise_date: The option is scheduled to vest and become exercisable as to 40% of the shares subject to the grant on June 5, 2026. The remaining 60% of the shares subject to the grant is scheduled to vest and become exercisable on June 5, 2027.

Read SEC document
June 05, 2025 Filed Jun 9, 2025 20:02 UTC GrantStock Option (right to buy) · Derivative 46,000 $0.00 Strike: $1.83 $0.00
Disclosure

SEC source: 0000950170-25-083684 · ownership.xml · derivative · entry 1

Scheiner Zachary · CIK 0001816523 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,000

Underlying: Common Stock · 46,000 shares

Expires 2035-06-04

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 5, 2026 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

F2 · ownership.direct: Under the Reporting Person's arrangement with RA Capital Management, L.P. (the "Adviser"), the Reporting Person holds the stock option for the benefit of the RA Capital Healthcare Fund, L.P. (the "Fund") and the RA Capital Nexus Fund, L.P. (the "Nexus Fund"). The Reporting Person is obligated to turn over to the Adviser any net cash or stock received upon exercise of the stock option, which will offset advisory fees owed by the Fund and the Nexus Fund to the Adviser. The Reporting Person therefore disclaims beneficial ownership of the stock option and underlying common stock.

Read SEC document
June 05, 2025 Filed Jun 9, 2025 20:04 UTC GrantStock Option (right to buy) · Derivative 46,000 $0.00 Strike: $1.83 $0.00
Disclosure

SEC source: 0000950170-25-083688 · ownership.xml · derivative · entry 1

Thedinga Angela · CIK 0001804588 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,000

Underlying: Common Stock · 46,000 shares

Expires 2035-06-04

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 5, 2026 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

Read SEC document
June 05, 2025 Filed Jun 9, 2025 20:01 UTC GrantStock Option (right to buy) · Derivative 46,000 $0.00 Strike: $1.83 $0.00
Disclosure

SEC source: 0000950170-25-083681 · ownership.xml · derivative · entry 1

PATTERSON LEONE D · CIK 0001233539 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,000

Underlying: Common Stock · 46,000 shares

Expires 2035-06-04

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 5, 2026 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

Read SEC document
June 05, 2025 Filed Jun 9, 2025 20:05 UTC
HASTINGS PAUL JDirector · Chief Executive Officer
GrantStock Option (right to buy) · Derivative 377,000 $0.00 Strike: $1.83 $0.00
Disclosure

SEC source: 0000950170-25-083708 · ownership.xml · derivative · entry 1

HASTINGS PAUL J · CIK 0001309702 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 377,000

Underlying: Common Stock · 377,000 shares

Expires 2035-06-05

F1 · derivative.exercise_date: The option is scheduled to vest and become exercisable as to 40% of the shares subject to the grant on June 5, 2026. The remaining 60% of the shares subject to the grant is scheduled to vest and become exercisable on June 5, 2027.

Read SEC document
June 05, 2025 Filed Jun 9, 2025 20:10 UTC
RA CAPITAL MANAGEMENT, L.P.Director · 10% owner
RA Capital Healthcare Fund LPDirector · 10% owner
Kolchinsky PeterDirector · 10% owner
Shah Rajeev M.Director · 10% owner
GrantStock Option (right to buy) · Derivative 46,000 $0.00 Strike: $1.83 $0.00
Disclosure

SEC source: 0001415889-25-016224 · form4-06092025_080617.xml · derivative · entry 1

RA CAPITAL MANAGEMENT, L.P. · CIK 0001346824 · Director · 10% owner

RA Capital Healthcare Fund LP · CIK 0001315082 · Director · 10% owner

RA Capital Nexus Fund, L.P. · CIK 0001780117 · Director

Kolchinsky Peter · CIK 0001384859 · Director · 10% owner

Shah Rajeev M. · CIK 0001619841 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 46,000

Underlying: Common Stock · 46,000 shares

Expires 2035-06-04

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 5, 2026 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award, subject to Dr. Scheiner's continued service through the applicable vesting date. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Dr. Scheiner's separation from service with the Issuer due to the his death or "disability" (as described in the applicable award agreement).

F2 · ownership.nature: RA Capital Management, L.P. (the "Adviser") is the investment manager for RA Capital Healthcare Fund, L.P. (the "Fund") and RA Capital Nexus Fund, L.P. (the "Nexus Fund"). The general partner of the Adviser is RA Capital Management GP, LLC (the "Adviser GP"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. Each of the Adviser, the Adviser GP, the Fund, the Nexus Fund, Dr. Kolchinsky and Mr. Shah disclaims beneficial ownership of any of the reported securities, except to the extent of its or his respective pecuniary interest therein.

F3 · ownership.nature: Zachary Scheiner is a Principal of the Adviser who serves on the Issuer's board of directors. Under Dr. Scheiner's arrangement with the Adviser, Dr. Scheiner holds the option for the benefit of the Fund and the Nexus Fund. Dr. Scheiner is obligated to turn over to the Adviser any net cash or stock received upon exercise of the option, which will offset advisory fees owed by the Fund and the Nexus Fund to the Adviser. The Reporting Persons therefore disclaim beneficial ownership of the option and underlying common stock.

Read SEC document
June 05, 2025 Filed Jun 9, 2025 20:39 UTC GrantStock Option (right to buy) · Derivative 46,000 $0.00 Strike: $1.83 $0.00
Disclosure

SEC source: 0000950170-25-083803 · ownership.xml · derivative · entry 1

George Simeon · CIK 0001595117 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,000

Underlying: Common Stock · 46,000 shares

Expires 2035-06-04

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 5, 2026 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

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June 05, 2025 Filed Jun 9, 2025 20:00 UTC GrantStock Option (right to buy) · Derivative 46,000 $0.00 Strike: $1.83 $0.00
Disclosure

SEC source: 0000950170-25-083677 · ownership.xml · derivative · entry 1

Dybbs Michael · CIK 0001601264 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,000

Underlying: Common Stock · 46,000 shares

Expires 2035-06-04

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 5, 2026 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

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June 05, 2025 Filed Jun 9, 2025 20:25 UTC GrantStock Option (right to buy) · Derivative 46,000 $0.00 Strike: $1.83 $0.00
Disclosure

SEC source: 0000950170-25-083779 · ownership.xml · derivative · entry 1

Behbahani Ali · CIK 0001613867 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,000

Underlying: Common Stock · 46,000 shares

Expires 2035-06-04

F1 · derivative.exercise_date: All shares subject to the option vest 100% on the first to occur of (i) June 5, 2026 or (ii) the day immediately preceding the first annual meeting of the Issuer's stockholders to occur after the date of grant of the award. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement).

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January 15, 2025 Filed Jan 17, 2025 17:36 UTC
Levin AlyssaSee Remarks
SaleCommon Stock 5,838 $2.20 $12,843.60
Disclosure

SEC source: 0000950170-25-006827 · ownership.xml · nonDerivative · entry 1

Levin Alyssa · CIK 0001981854 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 102,662

F1 · shares: Represents shares sold as required by the applicable award terms to satisfy tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units and does not represent a discretionary transaction by the Reporting Person.

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January 15, 2025 Filed Jan 17, 2025 22:37 UTC
Shook DavidSee Remarks
SaleCommon Stock 8,638 $2.20 $19,003.60
Disclosure

SEC source: 0000950170-25-006829 · ownership.xml · nonDerivative · entry 1

Shook David · CIK 0001959742 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 190,955

F1 · shares: Represents shares sold as required by the applicable award terms to satisfy tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units and does not represent a discretionary transaction by the Reporting Person.

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January 15, 2025 Filed Jan 17, 2025 17:36 UTC
Brandenberger RalphChief Technical Officer
SaleCommon Stock 7,447 $2.20 $16,383.40
Disclosure

SEC source: 0000950170-25-006826 · ownership.xml · nonDerivative · entry 1

Brandenberger Ralph · CIK 0001853197 · Chief Technical Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 124,796

F1 · shares: Represents shares sold as required by the applicable award terms to satisfy tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units and does not represent a discretionary transaction by the Reporting Person.

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January 15, 2025 Filed Jan 17, 2025 22:35 UTC
HASTINGS PAUL JDirector · Chief Executive Officer
SaleCommon Stock 17,378 $2.20 $38,231.60
Disclosure

SEC source: 0000950170-25-006824 · ownership.xml · nonDerivative · entry 1

HASTINGS PAUL J · CIK 0001309702 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 319,859

F1 · shares: Represents shares sold as required by the applicable award terms to satisfy tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units and does not represent a discretionary transaction by the Reporting Person.

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January 15, 2025 Filed Jan 17, 2025 17:35 UTC
Hager Alicia J.Chief Legal Officer
SaleCommon Stock 9,584 $2.20 $21,084.80
Disclosure

SEC source: 0000950170-25-006823 · ownership.xml · nonDerivative · entry 1

Hager Alicia J. · CIK 0001553354 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 146,735

F1 · shares: Represents shares sold as required by the applicable award terms to satisfy tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units and does not represent a discretionary transaction by the Reporting Person.

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January 03, 2025 Filed Jan 7, 2025 16:06 UTC
Levin AlyssaSee Remarks
GrantStock Option (right to buy) · Derivative 105,000 $0.00 Strike: $2.50 $0.00
Disclosure

SEC source: 0000950170-25-002834 · ownership.xml · derivative · entry 2

Levin Alyssa · CIK 0001981854 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 105,000

Underlying: Common Stock · 105,000 shares

Expires 2035-01-02

F2 · derivative.exercise_date: This option is scheduled to vest and become exercisable in 48 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following January 14, 2025.

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January 03, 2025 Filed Jan 7, 2025 16:06 UTC
Levin AlyssaSee Remarks
GrantCommon Stock 52,500 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-002834 · ownership.xml · nonDerivative · entry 1

Levin Alyssa · CIK 0001981854 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 108,500

F1 · shares: Represents Restricted Stock Units ("RSUs") which vest in four equal annual installments beginning on January 14, 2026. Each RSU represents a contingent right to receive one share of Common Stock of the Issuer.

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January 03, 2025 Filed Jan 7, 2025 21:06 UTC
Shook DavidSee Remarks
GrantStock Option (right to buy) · Derivative 117,500 $0.00 Strike: $2.50 $0.00
Disclosure

SEC source: 0000950170-25-002835 · ownership.xml · derivative · entry 2

Shook David · CIK 0001959742 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 117,500

Underlying: Common Stock · 117,500 shares

Expires 2035-01-02

F3 · derivative.exercise_date: This option is scheduled to vest and become exercisable in 48 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following January 14, 2025.

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January 03, 2025 Filed Jan 7, 2025 21:06 UTC
Shook DavidSee Remarks
GrantCommon Stock 59,000 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-002835 · ownership.xml · nonDerivative · entry 1

Shook David · CIK 0001959742 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 199,593

F1 · shares: Represents Restricted Stock Units ("RSUs") which vest in four equal annual installments beginning on January 14, 2026. Each RSU represents a contingent right to receive one share of Common Stock of the Issuer.

F2 · balance_after: Includes 2,000 shares acquired under the Issuer's 2020 Employee Stock Purchase Plan on November 30, 2024.

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January 03, 2025 Filed Jan 7, 2025 16:06 UTC
Brandenberger RalphChief Technical Officer
GrantStock Option (right to buy) · Derivative 105,000 $0.00 Strike: $2.50 $0.00
Disclosure

SEC source: 0000950170-25-002833 · ownership.xml · derivative · entry 2

Brandenberger Ralph · CIK 0001853197 · Chief Technical Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 105,000

Underlying: Common Stock · 105,000 shares

Expires 2035-01-02

F2 · derivative.exercise_date: This option is scheduled to vest and become exercisable in 48 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following January 14, 2025.

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January 03, 2025 Filed Jan 7, 2025 16:06 UTC
Brandenberger RalphChief Technical Officer
GrantCommon Stock 52,500 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-002833 · ownership.xml · nonDerivative · entry 1

Brandenberger Ralph · CIK 0001853197 · Chief Technical Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 132,243

F1 · shares: Represents Restricted Stock Units ("RSUs") which vest in four equal annual installments beginning on January 14, 2026. Each RSU represents a contingent right to receive one share of Common Stock of the Issuer.

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January 03, 2025 Filed Jan 7, 2025 16:06 UTC
Mahmood NadirPresident
GrantStock Option (right to buy) · Derivative 123,500 $0.00 Strike: $2.50 $0.00
Disclosure

SEC source: 0000950170-25-002831 · ownership.xml · derivative · entry 2

Mahmood Nadir · CIK 0001816598 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 123,500

Underlying: Common Stock · 123,500 shares

Expires 2035-01-02

F2 · derivative.exercise_date: This option is scheduled to vest and become exercisable in 48 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following January 14, 2025.

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January 03, 2025 Filed Jan 7, 2025 16:06 UTC
Mahmood NadirPresident
GrantCommon Stock 62,000 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-002831 · ownership.xml · nonDerivative · entry 1

Mahmood Nadir · CIK 0001816598 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 93,376

F1 · shares: Represents Restricted Stock Units ("RSUs") which vest in four equal annual installments beginning on January 14, 2026. Each RSU represents a contingent right to receive one share of Common Stock of the Issuer.

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January 03, 2025 Filed Jan 7, 2025 21:05 UTC
HASTINGS PAUL JDirector · Chief Executive Officer
GrantStock Option (right to buy) · Derivative 565,500 $0.00 Strike: $2.50 $0.00
Disclosure

SEC source: 0000950170-25-002827 · ownership.xml · derivative · entry 2

HASTINGS PAUL J · CIK 0001309702 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 565,500

Underlying: Common Stock · 565,500 shares

Expires 2035-01-02

F3 · derivative.exercise_date: This option is scheduled to vest and become exercisable in 48 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following January 14, 2025.

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January 03, 2025 Filed Jan 7, 2025 21:05 UTC
HASTINGS PAUL JDirector · Chief Executive Officer
GrantCommon Stock 94,500 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-002827 · ownership.xml · nonDerivative · entry 1

HASTINGS PAUL J · CIK 0001309702 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 337,237

F1 · shares: Represents Restricted Stock Units ("RSUs") which vest in four equal annual installments beginning on January 14, 2026. Each RSU represents a contingent right to receive one share of Common Stock of the Issuer.

F2 · balance_after: Includes 2,000 shares acquired on May 31, 2024 and 2,000 shares acquired on November 30, 2024, in each case under the Issuer's 2020 Employee Stock Purchase Plan.

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January 03, 2025 Filed Jan 7, 2025 16:06 UTC
Hager Alicia J.Chief Legal Officer
GrantStock Option (right to buy) · Derivative 105,000 $0.00 Strike: $2.50 $0.00
Disclosure

SEC source: 0000950170-25-002832 · ownership.xml · derivative · entry 2

Hager Alicia J. · CIK 0001553354 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 105,000

Underlying: Common Stock · 105,000 shares

Expires 2035-01-02

F2 · derivative.exercise_date: This option is scheduled to vest and become exercisable in 48 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following January 14, 2025.

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January 03, 2025 Filed Jan 7, 2025 16:06 UTC
Hager Alicia J.Chief Legal Officer
GrantCommon Stock 52,500 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-002832 · ownership.xml · nonDerivative · entry 1

Hager Alicia J. · CIK 0001553354 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 156,319

F1 · shares: Represents Restricted Stock Units ("RSUs") which vest in four equal annual installments beginning on January 14, 2026. Each RSU represents a contingent right to receive one share of Common Stock of the Issuer.

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August 21, 2024 Filed Aug 23, 2024 20:30 UTC
Shook DavidSee Remarks
GrantCommon Stock 1,352 $5.11 $6,908.72
Disclosure

SEC source: 0000950170-24-100209 · ownership.xml · nonDerivative · entry 1

Shook David · CIK 0001959742 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 138,593

F1 · shares: Represents shares sold to satisfy tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units and does not represent a discretionary transaction by the Reporting Person.

F2 · balance_after: Includes 2,000 shares acquired under the Issuer's 2020 Employee Stock Purchase Plan on May 31, 2024.

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July 29, 2024 Filed Jul 31, 2024 16:48 UTC
Mahmood NadirPresident
GrantStock Option (right to buy) · Derivative 550,000 $0.00 Strike: $6.69 $0.00
Disclosure

SEC source: 0000950170-24-088663 · ownership.xml · derivative · entry 1

Mahmood Nadir · CIK 0001816598 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 550,000

Underlying: Common Stock · 550,000 shares

Expires 2034-07-28

F1 · derivative.exercise_date: The option is scheduled to vest and become exercisable as to 25% of the shares subject to the grant on July 29, 2025. The remaining portion of the option is scheduled to vest and become exercisable in 36 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following July 29, 2025.

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July 16, 2024 Filed Jul 18, 2024 16:22 UTC
Hager Alicia J.Chief Legal Officer
SaleCommon Stock 3,396 $8.00 $27,168.00
Disclosure

SEC source: 0000950170-24-084588 · ownership.xml · nonDerivative · entry 1

Hager Alicia J. · CIK 0001553354 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 103,819

F1 · kind: The transaction reported in this Form 4 was effected automatically pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person on March 28, 2024.

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July 15, 2024 Filed Jul 31, 2024 20:45 UTC
Shook DavidSee Remarks
GrantStock Option (right to buy) · Derivative 30,000 $0.00 Strike: $7.02 $0.00
Disclosure

SEC source: 0000950170-24-088659 · ownership.xml · derivative · entry 2

Shook David · CIK 0001959742 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,000

Underlying: Common Stock · 30,000 shares

Expires 2034-07-14

F1 · date: This transaction is inadvertently filed late due to an administrative error.

F3 · derivative.exercise_date: This option is scheduled to vest and become exercisable in 48 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following July 15, 2024.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.