Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ATYR held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | FMR LLC | 14.7M | $11.5M | +0.1% | 14.999% | 0.00% |
| 2 | FEDERATED HERMES, INC. | 10.5M | $8.2M | 0.0% | 10.719% | 0.01% |
| 3 | BlackRock, Inc. | 6.4M | $5.0M | -1.6% | 6.572% | 0.00% |
| 4 | UBS Group AG | 3.9M | $3.0M | +137.9% | 3.944% | 0.00% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 3.8M | $3.0M | β | 3.888% | 0.00% |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | 2.4M | $1.9M | +4.5% | 2.433% | 0.00% |
| 7 | STATE STREET CORP | 1.8M | $1.4M | +1.7% | 1.789% | 0.00% |
| 8 | MILLENNIUM MANAGEMENT LLC | 1.6M | $1.3M | β | 1.674% | 0.00% |
| 9 | MORGAN STANLEY | 1.2M | $956K | -12.7% | 1.250% | 0.00% |
| 10 | TWO SIGMA INVESTMENTS, LP | 1.1M | $893K | +151.9% | 1.167% | 0.00% |
| 11 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 1.1M | $883K | +4.0% | 1.155% | 0.00% |
| 12 | NORTHERN TRUST CORP | 711K | $555K | +1.3% | 0.725% | 0.00% |
| 13 | VANGUARD FIDUCIARY TRUST CO | 652K | $508K | β | 0.665% | 0.00% |
| 14 | VANGUARD PORTFOLIO MANAGEMENT LLC | 569K | $444K | β | 0.581% | 0.00% |
| 15 | AQR CAPITAL MANAGEMENT LLC | 496K | $387K | -35.6% | 0.506% | 0.00% |
| 16 | BANK OF AMERICA CORP /DE/ | 304K | $237K | +139.6% | 0.310% | 0.00% |
| 17 | GOLDMAN SACHS GROUP INC | 283K | $221K | -18.0% | 0.289% | 0.00% |
| 18 | EverSource Wealth Advisors, LLC | 581K | $219K | +360597.5% | 0.592% | 0.01% |
| 19 | Nuveen, LLC | 229K | $179K | +0.6% | 0.234% | 0.00% |
| 20 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 211K | $164K | -5.0% | 0.215% | 0.00% |
| 21 | CITADEL ADVISORS LLC | 203K | $159K | β | 0.207% | 0.00% |
| 22 | Bank of New York Mellon Corp | 194K | $151K | 0.0% | 0.197% | 0.00% |
| 23 | GROUP ONE TRADING, L.P. | 184K | $144K | -3.7% | 0.188% | 0.00% |
| 24 | MARSHALL WACE, LLP | 138K | $108K | β | 0.141% | 0.00% |
| 25 | XTX Topco Ltd | 111K | $87K | +40.4% | 0.114% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in ATYR β a direct measure of their conviction.
Filings activity in ATYR during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new ATYR position in Q1 2026
Institutions that fully closed their ATYR position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 107 | +32% | 99.10% | 26.06 pp | $43M | 21% |
| Q4 2025 | 81 | 19% | 125.16% | +1.91 pp | $54M | +1.6% |
| Q3 2025 | 100 | 6.5% | 123.25% | 76.74 pp | $53M | 84% |
| Q2 2025 | 107 | +26% | 199.99% | +0.00 pp | $325M | +82% |
| Q1 2025 | 85 | +10% | 199.99% | +0.00 pp | $178M | 9.6% |
| Q4 2024 | 77 | +40% | 199.99% | +10.55 pp | $197M | +141% |
| Q3 2024 | 55 | +22% | 189.44% | +23.63 pp | $82M | +14% |
| Q2 2024 | 45 | β | 165.81% | β | $72M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ATYR stock.
Based on Q1 2026 13F filings, institutional ownership of aTyr Pharma, Inc. stands at 99.1%, held across 107 reporting institutions.
FMR LLC is the largest reported institutional holder of ATYR, with approximately 14,706,843 shares worth $0.01B as of Q1 2026.
Yes β 4 widely-followed marquee investors appear among the top 25 institutional holders of ATYR, including MILLENNIUM MANAGEMENT LLC, TWO SIGMA INVESTMENTS, LP, SUSQUEHANNA INTERNATIONAL GROUP, LLP, CITADEL ADVISORS LLC.
Our composite Smart Money Score for ATYR is 63 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
38 institutions opened new positions in ATYR during Q1 2026, while 12 fully exited. 23 added to existing positions and 42 trimmed.
ATYR institutional ownership fell by 26.06 percentage points quarter-over-quarter, with a net change of +26 holders.
The top 10 institutions account for 86.6% of all reported 13F value in ATYR, and the top 25 account for 97.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
aTyr Pharma, Inc. (ATYR) Institutional Ownership