Who owns Tectonic Therapeutic, Inc.?
Institutional ownership of TECX from SEC Form 13F filings across 90 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
90
13F holders
$315.8M
value, 2026 filers
49.2%
of shares outstanding (9.3M sh)
20
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of TECX's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | FMR LLC | 2.8M | $97.3M | 0.0% | 15% | +0.5% |
| 2 | TCG Crossover Management, LLC | 1.2M | $41.4M | 1.0% | 6.4% | 0.0% |
| 3 | Aberdeen Group plc | 1.1M | $39.3M | 0.1% | 6.1% | 0.0% |
| 4 | BlackRock, Inc. | 862,592 | $29.7M | 0.0% | 4.6% | +0.3% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 488,805 | $16.8M | 0.0% | 2.6% | -48.4% |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | 270,461 | $9.3M | 0.0% | 1.4% | +0.8% |
| 7 | D. E. Shaw & Co., Inc. | 186,550 | $6.4M | 0.0% | 1% | +60.7% |
| 8 | MARSHALL WACE, LLP | 172,101 | $5.9M | 0.0% | 0.9% | -25.0% |
| 9 | MILLENNIUM MANAGEMENT LLC | 165,525 | $5.7M | 0.0% | 0.9% | +183.7% |
| 10 | Squarepoint Ops LLC | 145,028 | $5.0M | 0.0% | 0.8% | -11.8% |
| 11 | AMERIPRISE FINANCIAL INC | 142,448 | $4.9M | 0.0% | 0.8% | -0.7% |
| 12 | WELLS FARGO & COMPANY/MN | 117,428 | $4.0M | 0.0% | 0.6% | +4.2% |
| 13 | NORTHERN TRUST CORP | 113,904 | $3.9M | 0.0% | 0.6% | +45.4% |
| 14 | Woodline Partners LP | 100,000 | $3.4M | 0.0% | 0.5% | -50.0% |
| 15 | VANGUARD PORTFOLIO MANAGEMENT LLC | 94,414 | $3.2M | 0.0% | 0.5% | +48.4% |
| 16 | CITADEL ADVISORS LLCNEW | 90,393 | $3.1M | 0.0% | 0.5% | new |
| 17 | GOLDMAN SACHS GROUP INC | 73,924 | $2.5M | 0.0% | 0.4% | +18.4% |
| 18 | RAYMOND JAMES FINANCIAL INC | 72,674 | $2.5M | 0.0% | 0.4% | +13.2% |
| 19 | SECTORAL ASSET MANAGEMENT INC | 71,009 | $2.4M | 1.7% | 0.4% | +272.6% |
| 20 | VANGUARD FIDUCIARY TRUST CO | 68,394 | $2.4M | 0.0% | 0.4% | +0.7% |
| 21 | JANE STREET GROUP, LLCNEW | 65,821 | $2.3M | 0.0% | 0.3% | new |
| 22 | MORGAN STANLEY | 65,373 | $2.2M | 0.0% | 0.3% | +0.8% |
| 23 | Connor, Clark & Lunn Investment Management Ltd. | 64,940 | $2.2M | 0.0% | 0.3% | -3.1% |
| 24 | BOOTHBAY FUND MANAGEMENT, LLC | 60,771 | $2.1M | 0.0% | 0.3% | +31.7% |
| 25 | JPMORGAN CHASE & CO | 55,364 | $1.8M | 0.0% | 0.3% | -6.0% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.