STRO Institutional Ownership & Shareholders
SUTRO BIOPHARMA INC (STRO) is currently held by 101 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $541.89M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Perceptive Advisors Llc is currently the largest disclosed institutional shareholder of STRO tracked by InsiderSet, reporting ownership valued at approximately $43.32M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $11.89M, representing an estimated loss of -72.56% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 58% of the total disclosed STRO value among the investors covered in this analysis. Major shareholders include Perceptive Advisors Llc, Bvf Inc/Il, Affinity Asset Advisors, Llc, and several other long-term asset managers with concentrated positions in SUTRO BIOPHARMA INC (STRO).
This page ranks the largest institutional STRO shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
101
Total Reported Value
$541.89M
Largest Holder
Perceptive Advisors Llc
Largest Position
$43.32M
Insider Transactions (90d)
4
Latest Filing Quarter
Q2 2026
New Institutional Positions
128
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Perceptive Advisors Llc | 0.67% | 1,304,846 | $43,320,887 | $11,887,147 | -$31,433,740 | -72.56% | |
| Bvf Inc/Il | 1.06% | 1,251,788 | $41,559,362 | $11,403,789 | -$30,155,573 | -72.56% | |
| Affinity Asset Advisors, Llc | 1.90% | 1,172,487 | $38,926,568 | $10,681,357 | -$28,245,211 | -72.56% | |
| Blackrock, Inc. | 0.00% | 1,122,655 | $37,272,146 | $10,227,387 | -$27,044,759 | -72.56% | |
| Samsara Biocapital, Llc | 2.90% | 1,062,872 | $35,287,350 | $9,682,764 | -$25,604,586 | -72.56% | |
| Kynam Capital Management, Lp | 1.60% | 872,558 | $28,968,926 | $7,949,003 | -$21,019,923 | -72.56% | |
| Orbimed Advisors Llc | 0.47% | 743,944 | $24,698,941 | $6,777,330 | -$17,921,611 | -72.56% | |
| Balyasny Asset Management L.P. | 0.04% | 711,162 | $23,610,578 | $6,478,686 | -$17,131,892 | -72.56% | |
| Vanguard Capital Management Llc | 0.00% | 694,219 | $23,048,071 | $6,324,335 | -$16,723,736 | -72.56% | |
| Eventide Asset Management, Llc | 0.26% | 585,262 | $19,430,698 | $5,331,737 | -$14,098,961 | -72.56% | |
| Velan Capital Investment Management Lp | 10.42% | 512,160 | $17,003,712 | $4,665,778 | -$12,337,934 | -72.56% | |
| Woodline Partners Lp | 0.05% | 458,029 | $15,206,563 | $4,172,644 | -$11,033,919 | -72.56% | |
| Adar1 Capital Management, Llc | 0.63% | 404,014 | $13,413,265 | $3,680,568 | -$9,732,697 | -72.56% | |
| Geode Capital Management, Llc | 0.00% | 389,692 | $12,940,982 | $3,550,094 | -$9,390,888 | -72.57% | |
| Acadian Asset Management Llc | 0.01% | 373,839 | $12,405,000 | $3,405,673 | -$8,999,327 | -72.55% | |
| Millennium Management Llc | 0.01% | 365,972 | $12,150,270 | $3,334,005 | -$8,816,265 | -72.56% | |
| State Street Corp | 0.00% | 305,979 | $10,158,503 | $2,787,469 | -$7,371,034 | -72.56% | |
| Merck & Co., Inc. | 1.72% | 272,351 | $9,042,053 | $2,481,118 | -$6,560,935 | -72.56% | |
| Acuta Capital Partners, Llc | 6.25% | 270,251 | $8,972,333 | $2,461,987 | -$6,510,346 | -72.56% | |
| Ameriprise Financial Inc | 0.00% | 244,669 | $8,123,011 | $2,228,935 | -$5,894,076 | -72.56% | |
| Point72 Asset Management, L.P. | 0.01% | 237,827 | $7,895,856 | $2,166,604 | -$5,729,252 | -72.56% | |
| Kvp Capital Advisors, Lp | 5.52% | 226,575 | $7,522,290 | $2,064,098 | -$5,458,192 | -72.56% | |
| Ubs Group Ag | 0.00% | 208,512 | $6,922,599 | $1,899,544 | -$5,023,055 | -72.56% | |
| Two Sigma Investments, Lp | 0.01% | 201,688 | $6,696,042 | $1,837,378 | -$4,858,664 | -72.56% | |
| Vanguard Portfolio Management Llc | 0.00% | 197,562 | $6,559,058 | $1,799,790 | -$4,759,268 | -72.56% | |
| Marshall Wace, Llp | 0.00% | 175,246 | $5,818,167 | $1,596,491 | -$4,221,676 | -72.56% | |
| Nuveen, Llc | 0.00% | 167,997 | $5,577,500 | $1,530,453 | -$4,047,047 | -72.56% | |
| Jpmorgan Chase & Co | 0.00% | 159,627 | $5,323,560 | $1,454,202 | -$3,869,358 | -72.68% | |
| Goldman Sachs Group Inc | 0.00% | 149,216 | $4,953,971 | $1,359,358 | -$3,594,613 | -72.56% | |
| Northern Trust Corp | 0.00% | 125,933 | $4,180,976 | $1,147,250 | -$3,033,726 | -72.56% | |
| Seven Fleet Capital Management Lp | 0.63% | 159,118 | $3,794,182 | $1,449,565 | -$2,344,617 | -61.80% | |
| Qube Research & Technologies Ltd | 0.00% | 106,610 | $3,539,452 | $971,217 | -$2,568,235 | -72.56% | |
| Vanguard Fiduciary Trust Co | 0.00% | 104,232 | $3,460,502 | $949,554 | -$2,510,948 | -72.56% | |
| Citadel Advisors Llc | 0.00% | 101,965 | $3,385,238 | $928,901 | -$2,456,337 | -72.56% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 86,324 | $2,865,957 | $786,412 | -$2,079,545 | -72.56% |
| Invesco Ltd. | 0.00% | 57,305 | $1,902,526 | $522,049 | -$1,380,477 | -72.56% | |
| Squarepoint Ops Llc | 0.00% | 55,539 | $1,843,895 | $505,960 | -$1,337,935 | -72.56% | |
| Xtx Topco Ltd | 0.02% | 52,169 | $1,732,011 | $475,260 | -$1,256,751 | -72.56% | |
| Charles Schwab Investment Management Inc | 0.00% | 49,302 | $1,636,826 | $449,141 | -$1,187,685 | -72.56% | |
| Y-Intercept (Hong Kong) Ltd | 0.03% | 90,536 | $1,458,535 | $824,783 | -$633,752 | -43.45% | |
| Bank Of New York Mellon Corp | 0.00% | 41,369 | $1,373,451 | $376,872 | -$996,579 | -72.56% | |
| Barclays Plc | 0.00% | 36,954 | $1,226,872 | $336,651 | -$890,221 | -72.56% | |
| Bank Of America Corp | 0.00% | 36,140 | $1,199,848 | $329,235 | -$870,613 | -72.56% | |
| Fisher Asset Management, Llc | 0.00% | 35,295 | $1,171,794 | $321,537 | -$850,257 | -72.56% | |
| Mackenzie Financial Corp | 0.00% | 68,513 | $1,103,744 | $624,153 | -$479,591 | -43.45% | |
| Elmind Capital, Lp | 0.27% | 32,037 | $1,063,628 | $291,857 | -$771,771 | -72.56% | |
| D. E. Shaw & Co., Inc. | 0.00% | 30,128 | $1,000,250 | $274,466 | -$725,784 | -72.56% | |
| Trexquant Investment Lp | 0.01% | 27,636 | $917,515 | $251,764 | -$665,751 | -72.56% | |
| Bnp Paribas Financial Markets | 0.00% | 27,383 | $909,116 | $249,459 | -$659,657 | -72.56% | |
| Rhumbline Advisers | 0.00% | 20,628 | $684,845 | $187,921 | -$496,924 | -72.56% |
Frequently asked questions about STRO
Who are the largest institutional holders of STRO?
The largest institutional holders of STRO reported in the latest SEC Form 13F filings include Perceptive Advisors Llc, Bvf Inc/Il, Affinity Asset Advisors, Llc, Blackrock, Inc., and Samsara Biocapital, Llc. InsiderSet ranks institutional holders by their latest reported STRO position.
What is STRO institutional ownership?
This page tracks STRO positions reported by institutional investment managers through SEC Form 13F. SUTRO BIOPHARMA INC (STRO) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own STRO?
InsiderSet currently tracks 101 institutional managers reporting STRO holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of STRO shareholders.
How much STRO stock do institutions own?
Institutional investment managers disclosed approximately $541.89M in STRO holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was STRO institutional ownership last updated?
The latest STRO institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional STRO holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its STRO position after the reporting date.
Are institutions buying or selling STRO?
Institutional buying and selling can be analyzed by comparing STRO positions across consecutive 13F reporting periods. InsiderSet's STRO Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View STRO ownership changes.
How has STRO institutional ownership changed over time?
InsiderSet tracks STRO institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.