SUTRO BIOPHARMA (STRO) stock: insider trades, news & valuation
Strong buyingShare price and insider trades
SUTRO BIOPHARMA insider trading at a glance (Oct 9, 2026): in the past 12 months, 5 insiders bought $90K and 0 sold $0 of STRO stock on the open market, including a cluster buy that began Oct 15, 2025.
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STRO insider buying and selling by quarter
Open-market purchases (green, above the line) and sales (red, below), by trade date.
| Quarter | Bought | Purchases | Sold | Sales |
|---|---|---|---|---|
| Q4 2026 | — | 0 | — | 0 |
| Q3 2026 | — | 0 | — | 0 |
| Q2 2026 | — | 0 | — | 0 |
| Q1 2026 | — | 0 | — | 0 |
| Q4 2025 | $90K | 5 | — | 0 |
Valuation, profit and volume
Summary
Over the past 12 months, 5 SUTRO BIOPHARMA, INC. insiders reported open-market purchases totaling $90K, while 0 insiders reported sales totaling $0. The most recent cluster buy began on Oct 15, 2025, when 5 insiders bought a combined $90K.
Insider transactions
Open-market purchases and sales.
| Filed | Insider | Type | Shares | Price | Value | Since | Score |
|---|---|---|---|---|---|---|---|
| Oct 16SEC | Connie MatsuiDirector | Buy | 50,000new position | $0.80 | $40K | +1683.7% | — |
| Oct 16SEC | Gregory K. ChowCFO | Buy | 19,750new position | $0.81 | $16K | +1661.7% | — |
| Oct 16SEC | Hans-peter GerberChief Scientific Officer | Buy | 17,00071,832 held (+31%) | $0.80 | $14K | +1683.7% | — |
| Oct 16SEC | David PaulingChief Admin. Ofcr. & Gc | Buy | 12,50471,737 held (+21%) | $0.80 | $10K | +1683.7% | — |
| Oct 16SEC | Jane ChungCEO | Buy | 12,500122,850 held (+11%) | $0.80 | $10K | +1683.7% | — |
Insiders at SUTRO BIOPHARMA, INC.
| Insider | Bought | Sold | Last filing | Score |
|---|---|---|---|---|
| Connie MatsuiDirector | $40K | — | Oct 16, 2025 | — |
| Gregory K. ChowCFO | $16K | — | Oct 16, 2025 | — |
| Hans-peter GerberChief Scientific Officer | $14K | — | Oct 16, 2025 | — |
| David PaulingChief Admin. Ofcr. & Gc | $10K | — | Oct 16, 2025 | — |
| Jane ChungCEO | $10K | — | Oct 16, 2025 | — |
STRO stock: common questions
Are SUTRO BIOPHARMA, INC. insiders buying STRO stock?
In the past 12 months, 5 insiders reported open-market purchases of STRO worth $90K. The latest was Director Connie Matsui bought $40K of STRO at $0.80 — first open-market purchase in our records; opens a new position.
Are SUTRO BIOPHARMA, INC. insiders selling STRO stock?
0 insiders reported sales worth $0 over the same period.
Where does this data come from?
Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.
What is STRO's 52-week range?
Over the past year STRO has traded between $7.30 and $40.91. It last closed at $14.27 on Oct 9, 2026.