STRO · Insider trading · 13F holders · Congress trades
Sutro Biopharma, Inc. (STRO)
Who is buying and selling STRO: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 13
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
STRO at a glance
- No open-market insider purchases or sales of STRO were filed in the last 90 days.
- 13 13F filers hold STRO among their 50 largest positions, worth $249.3M combined, including Joseph Edelman. The biggest bets by portfolio weight are Velan Capital Investment Management LP (10.4%), Acuta Capital Partners, LLC (6.3%) and KVP Capital Advisors, LP (5.5%). In their latest 13Fs, 2 managers opened a new position and 1 added to one.
- No member of Congress has disclosed a trade in STRO.
STRO insider trading
No open-market insider purchases or sales of STRO were filed in the last 90 days.
Who owns STRO? Hedge funds and superinvestors
13 13F filers hold STRO among their 50 largest positions, worth $249.3M combined, including Joseph Edelman. The biggest bets by portfolio weight are Velan Capital Investment Management LP (10.4%), Acuta Capital Partners, LLC (6.3%) and KVP Capital Advisors, LP (5.5%). In their latest 13Fs, 2 managers opened a new position and 1 added to one.
Superinvestors holding STRO: Joseph Edelman 0.7%
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Joseph EdelmanHedge fund | 0.7% | $43.3M | 1,304,846 | — | Q2 2026 |
| Bvf Inc/ilInvestment manager | 1.1% | $41.6M | 1,251,788 | +0.0% shares | Q2 2026 |
| Affinity Asset Advisors, LLCHedge fund | 1.9% | $38.9M | 1,172,487 | +9.6% shares | Q2 2026 |
| Samsara Biocapital, LLCHedge fund | 2.9% | $35.3M | 1,062,872 | +0.0% shares | Q2 2026 |
| Kynam Capital Management, LPHedge fund | 1.6% | $29.0M | 872,558 | +0.0% shares | Q2 2026 |
| Velan Capital Investment Management LPHedge fund | 10.4% | $17.0M | 512,160 | +0.0% shares | Q2 2026 |
| ADAR1 Capital Management, LLCHedge fund | 0.6% | $13.4M | 404,014 | -23.0% shares | Q2 2026 |
| Merck & Co., Inc.Corporation | 1.7% | $9.0M | 272,351 | New | Q2 2026 |
| Acuta Capital Partners, LLCHedge fund | 6.3% | $9.0M | 270,251 | +0.3% shares | Q2 2026 |
| KVP Capital Advisors, LPHedge fund | 5.5% | $7.5M | 226,575 | +0.0% shares | Q2 2026 |
| Seven Fleet Capital Management LPHedge fund | 0.6% | $3.8M | 159,118 | — | Q2 2026 |
| Elmind Capital, LPHedge fund | 0.3% | $1.1M | 32,037 | New | Q2 2026 |
| AJU IB Investment Co., Ltd.Investment manager | 1.4% | $436K | 17,500 | +0.0% shares | Q1 2026 |
Each manager counts with its latest 13F (Q2 2026: 12, Q1 2026: 1). Screen STRO in the grand portfolio →
STRO stock trades by members of Congress
No member of Congress has disclosed a trade in STRO.
STRO questions and answers
Are insiders buying STRO stock?
No open-market insider purchases or sales of STRO were filed in the last 90 days.
Which hedge funds own STRO?
13 13F filers hold STRO among their 50 largest positions, worth $249.3M combined, including Joseph Edelman. The biggest bets by portfolio weight are Velan Capital Investment Management LP (10.4%), Acuta Capital Partners, LLC (6.3%) and KVP Capital Advisors, LP (5.5%). In their latest 13Fs, 2 managers opened a new position and 1 added to one.
Has Congress traded STRO?
No member of Congress has disclosed a trade in STRO.
Who is the largest holder of STRO?
Among 13F filers, Joseph Edelman reports the largest STRO position, $43.3M (1,304,846 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Velan Capital Investment Management LP's: 10.4% of its portfolio.
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