STRO — SUTRO BIOPHARMA, INC.
Price · 2024-08-26 → 2026-08-21
499 daily closes shownAnonymous view is capped at two years of history. A free account extends it to five, and Pro opens the whole archive back to 2018-09-27.
Performance
Technicals
Others in Healthcare
Measured signals that fired on STRO
| date | signal | measured base rate |
|---|---|---|
| 2026-08-12 | Fair value gap, bearish structure | -0.45% over 21 days · t = -3.29 · n = 108,591 statistically distinguishable from its control group |
| 2026-07-17 | Equal lows taken out structure | -0.64% over 21 days · t = -4.75 · n = 55,661 statistically distinguishable from its control group |
| 2026-05-15 | Institutional holders jumped in a quarter ownership | -0.52% over 21 days · t = -0.38 · n = 1,553 not distinguishable from its control group |
| 2026-04-13 | Equal highs taken out structure | -0.70% over 21 days · t = -8.28 · n = 68,636 statistically distinguishable from its control group |
| 2026-04-07 | Short volume far above its own normal short | -0.76% over 21 days · t = -2.79 · n = 5,897 statistically distinguishable from its control group |
| 2026-03-10 | Breakout to a 52-week high price | -1.00% over 21 days · t = -8.58 · n = 24,386 statistically distinguishable from its control group |
Excess return against a matched control group, on a point-in-time universe that includes delisted companies. Most families do not survive that. How the measurement works →
Insider transactions (Form 4)
| date | insider | what | shares | price | value |
|---|---|---|---|---|---|
| 2026-06-02 | Chow Gregory K. CFO | Option exercise | 2.5K | 0.00 | 0 |
| 2026-03-04 | Chung Jane Chief Executive Officer | Shares withheld for tax | 282 | 21.31 | 6.0K |
| 2026-03-04 | Pauling David Chief Admin. Ofcr. & GC | Shares withheld for tax | 277 | 21.31 | 5.9K |
| 2026-03-04 | Chung Jane Chief Executive Officer | Option exercise | 788 | 0.00 | 0 |
| 2026-03-04 | Pauling David Chief Admin. Ofcr. & GC | Option exercise | 675 | 0.00 | 0 |
| 2026-03-02 | Chung Jane Chief Executive Officer | Shares withheld for tax | 2.8K | 20.55 | 57.1K |
| 2026-03-02 | Gerber Hans-Peter CHIEF SCIENTIFIC OFFICER | Shares withheld for tax | 1.2K | 20.55 | 24.0K |
| 2026-03-02 | Pauling David Chief Admin. Ofcr. & GC | Shares withheld for tax | 970 | 20.55 | 19.9K |
| 2026-03-02 | Pauling David Chief Admin. Ofcr. & GC | Option exercise | 2.4K | 0.00 | 0 |
| 2026-03-02 | Chung Jane Chief Executive Officer | Option exercise | 7.8K | 0.00 | 0 |
Open-market purchases (code P) are the informative ones. Grants, option exercises and tax withholding are compensation mechanics, not decisions. How to read a Form 4 →
Largest institutional holders
| manager | value | shares |
|---|---|---|
| BVF INC/IL | 31.2M | 1.3M |
| Affinity Asset Advisors, LLC | 26.6M | 1.1M |
| SAMSARA BIOCAPITAL, LLC | 26.5M | 1.1M |
| Kynam Capital Management, LP | 21.7M | 872.6K |
| ORBIMED ADVISORS LLC | 20.0M | 801.1K |
| VANGUARD CAPITAL MANAGEMENT LLC | 17.9M | 720.4K |
| EVENTIDE ASSET MANAGEMENT, LLC | 17.8M | 715.3K |
| PERCEPTIVE ADVISORS LLC | 17.8M | 715.3K |
| RA CAPITAL MANAGEMENT, L.P. | 17.8M | 715.3K |
| Point72 Asset Management, L.P. | 17.2M | 692.1K |
13F positions as of 2026-03-31, filed up to 45 days after quarter end. Long-only US equity — shorts and derivatives never appear. What 13F does and does not show →
Latest SEC filings
| form | filed | period | |
|---|---|---|---|
| SCHEDULE 13G/A | 2026-08-14 | — | on EDGAR ↗ |
| SCHEDULE 13G/A | 2026-08-14 | — | on EDGAR ↗ |
| 10-Q | 2026-08-12 | 2026-06-30 | on EDGAR ↗ |
| 8-K | 2026-08-12 | 2026-08-12 | on EDGAR ↗ |
| SCHEDULE 13G | 2026-07-30 | — | on EDGAR ↗ |
| 4 | 2026-06-09 | 2026-06-05 | on EDGAR ↗ |
| 4 | 2026-06-09 | 2026-06-05 | on EDGAR ↗ |
| 4 | 2026-06-09 | 2026-06-05 | on EDGAR ↗ |
Short selling
This is off-exchange short volume, not short interest: it is flow, not position, and 40–50% is normal because market makers short to fill your buy. Why that number misleads →
Recent headlines
- Sutro Biopharma, Inc. (STRO) filed form 8-K · 2026-08-12 · SEC EDGAR
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