Key facts
- This page summarizes Jane Chung's Form 4 filing for SUTRO BIOPHARMA, INC. (STRO).
- 10 reported transactions and 5 derivative rows are listed below.
- Accepted by SEC: 03 Mar 2026, 18:48.
Jane Chung - 01 Mar 2026 Form 4 Insider Report for SUTRO BIOPHARMA, INC. (STRO)
- Reporting relationship
- Chief Executive Officer, Director
- Issuer ticker
- STRO
- Reported as of
- 01 Mar 2026
- Net transaction value
- -$83,126
- SEC form
- 4
- Accepted by SEC
- 03 Mar 2026, 18:48:50 UTC
- Prior SEC filing
- 16 Dec 2025
- Next SEC filing
- 06 Mar 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ David Pauling as attorney-in-fact
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Jane Chung filed Form 4 for SUTRO BIOPHARMA, INC. (STRO) on 03 Mar 2026.
Change
- Previous filing in this sequence was filed on 16 Dec 2025.
- Current net transaction value: -$83,126.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001872398
Primary reporting owner
Chung Jane
- Relationship
- Chief Executive Officer, Director
- Address
- C/O SUTRO BIOPHARMA, INC., 111 OYSTER POINT BLVD., SOUTH SAN FRANCISCO
- Signature
- /s/ David Pauling as attorney-in-fact
- Signature date
- 03 Mar 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
STRO
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +688
- Change %
- +5%
- Price
- $0.000000
- Shares after
- 14,579
- Date
- 01 Mar 2026
- Ownership
- Direct
STRO
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +2,500
- Change %
- +17%
- Price
- $0.000000
- Shares after
- 17,079
- Date
- 01 Mar 2026
- Ownership
- Direct
STRO
transaction
Common Stock
Tax liability
- Transaction value
- $26,017
- Shares
- -1,271
- Change %
- -7.4%
- Price
- $20.47
- Shares after
- 15,808
- Date
- 01 Mar 2026
- Ownership
- Direct
- Footnotes
- F1
STRO
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +7,750
- Change %
- +49%
- Price
- $0.000000
- Shares after
- 23,558
- Date
- 02 Mar 2026
- Ownership
- Direct
STRO
transaction
Common Stock
Tax liability
- Transaction value
- $57,108
- Shares
- -2,779
- Change %
- -12%
- Price
- $20.55
- Shares after
- 20,779
- Date
- 02 Mar 2026
- Ownership
- Direct
- Footnotes
- F1
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
STRO
transaction
Derivative
Restricted Stock Units (RSUs)
Options Exercise
- Transaction value
- $0
- Shares
- -688
- Change %
- -50%
- Price
- $0.000000
- Shares after
- 688
- Date
- 01 Mar 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 688
- Exercise price
- Footnotes
- F2, F3
STRO
transaction
Derivative
Restricted Stock Units (RSUs)
Options Exercise
- Transaction value
- $0
- Shares
- -2,500
- Change %
- -33%
- Price
- $0.000000
- Shares after
- 5,000
- Date
- 01 Mar 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 2,500
- Exercise price
- Footnotes
- F2, F4
STRO
transaction
Derivative
Restricted Stock Units (RSUs)
Options Exercise
- Transaction value
- $0
- Shares
- -7,750
- Change %
- -25%
- Price
- $0.000000
- Shares after
- 23,250
- Date
- 02 Mar 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 7,750
- Exercise price
- Footnotes
- F2, F5
STRO
transaction
Derivative
Restricted Stock Units (RSUs)
Award
- Transaction value
- $0
- Shares
- +40,000
- Change %
- Price
- $0.000000
- Shares after
- 40,000
- Date
- 02 Mar 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 40,000
- Exercise price
- Footnotes
- F2, F6
STRO
transaction
Derivative
Stock Option (right to buy)
Award
- Transaction value
- $0
- Shares
- +175,000
- Change %
- Price
- $0.000000
- Shares after
- 175,000
- Date
- 02 Mar 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 175,000
- Exercise price
- $20.55
- Footnotes
- F7
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 7 footnotes
Footnote F1
Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person.
Footnote F2
Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement.
Footnote F3
The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 1, 2024, subject to continued service through each vesting date.
Footnote F4
The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 1, 2025, subject to continued service through each vesting date.
Footnote F5
The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 2, 2026, subject to continued service through each vesting date.
Footnote F6
The RSUs shall vest as to 1/4 of the total award annually, with the first tranche vesting on March 1, 2027, subject to continued service through each vesting date.
Footnote F7
1/48 of the total option award shall vest monthly, subject to the reporting person's continued service through each vesting date, with the first tranche vesting on April 1, 2026.