STRO (Sutro Biopharma, Inc.)

Insider Trading Activity

Every open-market purchase and sale reported by STRO officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.

Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.

Form 4 Filings
50
most recent
Open-Market Buys
5
code P
Sales
0
code S
Reporting Insiders
23
current holders
STRO — Recent Form 4 Transactions (latest 2026-06-09)
FiledInsiderRole TypeSharesValue
2026-06-09 Sukhi Jagpal Director A
2026-06-09 Michael Dybbs Director A
2026-06-09 CONNIE MATSUI Director A
2026-06-09 Daniel H Petree Director A
2026-06-09 JAMES P PANEK Director A
2026-06-09 Jon Marc Wigginton Director A
2026-06-09 Heidi Hunter Director A
2026-06-09 Joseph M Lobacki Director A
2026-06-02 Gregory K. Chow CFO M
2026-03-06 David Pauling Chief Admin. Ofcr. & GC MIXED
2026-03-06 Jane Chung Chief Executive Officer MIXED
2026-03-03 Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER MIXED
2026-03-03 Gregory K. Chow CFO A
2026-03-03 David Pauling Chief Admin. Ofcr. & GC MIXED
2026-03-03 Jane Chung Chief Executive Officer MIXED
2025-12-29 Gregory K. Chow CFO A
2025-12-29 Daniel H Petree Director A
2025-12-29 Heidi Hunter Director A
2025-12-29 JAMES P PANEK Director A
2025-12-29 Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER A
2025-12-29 Michael Dybbs Director A
2025-12-29 Joseph M Lobacki Director A
2025-12-29 Sukhi Jagpal Director A
2025-12-29 CONNIE MATSUI Director A
2025-12-29 David Pauling Chief Admin. Ofcr. & GC A
2025-12-29 Jon Marc Wigginton Director A
2025-12-16 Jane Chung Chief Executive Officer MIXED
2025-10-16 Gregory K. Chow CFO Buy
2025-10-16 CONNIE MATSUI Director Buy
2025-10-16 Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER Buy
2025-10-16 David Pauling Chief Admin. Ofcr. & GC Buy
2025-10-16 Jane Chung Chief Executive Officer Buy
2025-09-22 Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER MIXED
2025-08-26 Jane Chung Chief Executive Officer MIXED
2025-08-26 Barbara Leyman Chief Business Officer MIXED
2025-06-10 Sukhi Jagpal Director A
2025-06-10 Joseph M Lobacki Director A
2025-06-10 Daniel H Petree Director A
2025-06-10 JAMES P PANEK Director A
2025-06-10 CONNIE MATSUI Director A
2025-06-10 Heidi Hunter Director A
2025-06-10 Michael Dybbs Director A
2025-06-10 Jon Marc Wigginton Director A
2025-06-02 Gregory K. Chow CFO A
2025-05-19 EDWARD C ALBINI CFO AND SECRETARY MIXED
2025-05-05 Venkatesh Srinivasan CHIEF TECH OP OFFICER MIXED
2025-05-05 LINDA A FITZPATRICK CHIEF PEOPLE & COMM. OFFICER MIXED
2025-05-05 Anne Elizabeth Borgman CHIEF MEDICAL OFFICER MIXED
2025-04-15 Venkatesh Srinivasan CHIEF TECH OP OFFICER MIXED
2025-04-08 Venkatesh Srinivasan CHIEF TECH OP OFFICER A
STRO — Current Insider Holders
InsiderRole Shares HeldValue
10%+ Owner 205,684
Director 194,490
10%+ Owner 172,620
10%+ Owner 144,584
10%+ Owner 143,069
CEO 40,905
Chief Executive Officer 21,285
CFO AND SECRETARY 15,652
CHIEF PEOPLE & COMM. OFFICER 13,782
CHIEF MEDICAL OFFICER 10,622
Pres. Rsrch & Cf. Sctific Ofcr 10,166
Chief Admin. Ofcr. & GC 9,748
CHIEF SCIENTIFIC OFFICER 8,308
CHIEF TECH OP OFFICER 5,369
Director 5,000
CFO 4,725
Chief Technical Ops. Officer 3,830
Chief Medical Officer 3,774
Director 2,246
Chief Business Officer 1,606
Director 1,293
CHIEF PORT. STRAT & ALNCE OFCR 1,280
10%+ Owner 855
How to read Form 4 activity

Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.

Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.

Full filing history and per-insider positions are on the STRO quote page; the site-wide leaderboard is on the insider transactions hub.