ATYR · aTYR PHARMA INC · Holdings
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Holder Concentration
Across 92 13F filersWho Holds ATYR
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 89 filers, like-for-like change -30.6%; actively managed books -24.8%; index-like books -43.0%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 39.1% | 48 | +16.7% |
| Exempt adviser | 5.9% | 4 | +1569.3% |
| Adviser | 21.9% | 1 | -19.4% |
| Bank | 6.8% | 10 | -62.1% |
| Broker-dealer | 0.4% | 2 | -20.6% |
| Non-US | 0.1% | 1 | -80.5% |
| Holding company | 16.2% | 4 | -72.3% |
| Insurer | 0.0% | 0 | -100.0% |
| Benefit plan | 0.0% | 0 | -100.0% |
| Unknown | 9.6% | 19 | +63.7% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 26.3% | 14 | -43.0% |
| Systematic-like | 19.7% | 14 | +53.4% |
| Concentrated | 5.0% | 11 | +1868.7% |
| Diversified active | 49.1% | 50 | -42.3% |
| Not measured | 0.0% | 0 | — |
| Unknown | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 23.9% | 49 | -68.7% |
| Medium turnover | 33.7% | 15 | -15.1% |
| High turnover | 26.5% | 19 | +73.2% |
| Unknown | 16.0% | 6 | +22.5% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 25.6% | 11 | +44.2% |
| Medium horizon | 5.3% | 10 | -70.2% |
| Long horizon | 63.6% | 58 | -39.3% |
| Unknown | 5.5% | 10 | +38.7% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 5.0% | 14 | +924.9% |
| $1B to $10B | 10.5% | 20 | +78.1% |
| $10B to $100B | 25.0% | 21 | -11.4% |
| $100B or more | 59.4% | 34 | -45.8% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 1.0% | 27 | +5.8% |
| Pooled investment vehicles | 17.9% | 10 | +49.6% |
| Registered funds and BDCs | 13.1% | 3 | -29.7% |
| Pension and profit sharing plans | 0.1% | 2 | +100.2% |
| Governments and sovereign funds | 0.1% | 1 | -70.5% |
| Other investment advisers | 0.0% | 2 | -36.3% |
| Diversified | 6.9% | 3 | +351.7% |
| Insurance companies | 0.0% | 0 | -100.0% |
| Corporations | 0.0% | 0 | — |
| Unknown | 60.9% | 41 | -45.0% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 26.0% | 15 | +92.2% |
| Private equity funds | 0.3% | 4 | +13.8% |
| Venture capital funds | 0.0% | 1 | +208.4% |
| Real estate funds | 0.2% | 5 | -28.1% |
| Securitized asset funds | 0.0% | 1 | 0.0% |
| Other private funds | 5.2% | 6 | +518.8% |
| No private funds | 13.3% | 20 | -28.8% |
| Mixed private funds | 0.0% | 0 | -100.0% |
| Private funds, type not stated | 0.0% | 0 | — |
| Unknown | 55.0% | 37 | -50.2% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 85.0% | 78 | -33.9% |
| Outside the US | 15.0% | 11 | -3.5% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 2 holders with no observed 2026-06-30 13F.
Conviction and Crowding
89 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 23.5% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies ATYR's active holders also own, quarter ended Sep 30, 2025Shareholder Targets
13F filers that own its peers but not ATYR, quarter ended Sep 30, 2025Found through its holder-overlap peers: TRVI, DUK, LOW, ABBV, BAC, AMZN, GOOGL, PG, LLY, WMT, HD, XOM, JNJ, BRK-B, JPM, META, NVDA, AAPL, MSFT. 6,568 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | Capital Research Global Investors Adviser, Diversified active | $181,737,789,347 18 held | MSFT, NVDA, AMZN |
| 2 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser, Index-like | $170,297,381,652 19 held | NVDA, MSFT, AAPL |
| 3 | Capital International Investors Adviser, Diversified active | $162,075,585,080 14 held | MSFT, GOOGL, NVDA |
| 4 | Capital World Investors Adviser, Diversified active | $157,835,619,048 14 held | MSFT, META, NVDA |
| 5 | FRANKLIN RESOURCES INC Adviser, Diversified active | $113,484,034,175 19 held | MSFT, NVDA, GOOGL |
| 6 | Amundi Holding company, Index-like | $105,968,507,942 18 held | NVDA, MSFT, AAPL |
| 7 | AMERIPRISE FINANCIAL INC Adviser, Diversified active | $102,255,269,016 18 held | NVDA, MSFT, GOOGL |
| 8 | Berkshire Hathaway Inc Insurer, Concentrated | $96,496,945,134 4 held | AAPL, BAC, GOOGL |
| 9 | Fisher Asset Management, LLC Adviser, Diversified active | $90,385,263,681 18 held | NVDA, AAPL, MSFT |
| 10 | LILLY ENDOWMENT INC Unknown, Unknown | $72,861,153,659 1 held | LLY |
Fund Ownership of ATYR by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 7.13% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 2.60% | 2,545,571 |
| Index ETFs | 4.54% | 4,449,733 |
| Active ETFs | 0.01% | 7,662 |
| Active funds | 16.91% | 16,587,124 |
| Unclassified | 0.00% | 0 |
| All registered funds | 24.05% | 23,590,090 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Large FEDERATED HERMES, INC. Adviser | $5,080,277 | 21.52% | 8,509,678 | Shares | 2026-08-12 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $2,273,430 | 9.63% | 3,808,091 | Shares | 2026-08-13 | |
| Mid GSA CAPITAL PARTNERS LLP Registered adviser | $2,062,553 | 8.74% | 3,454,863 | Shares | 2026-08-06 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $1,558,495 | 6.60% | 2,610,548 | Shares | 2026-08-14 | |
| Mega FMR LLC Holding company | $1,475,436 | 6.25% | 2,471,418 | Shares | 2026-08-13 | |
| Mega BlackRock, Inc. Holding company | $1,090,914 | 4.62% | 1,827,332 | Shares | 2026-08-07 | |
| Small Kalehua Capital Management LLC Exempt adviser | $1,067,535 | 4.52% | 1,788,167 | Shares | 2026-08-19 | |
| Mega JANE STREET GROUP, LLC | $1,027,614 | 4.35% | 1,721,297 | Shares | 2026-08-14 | |
| Mega UBS Group AG Bank | $914,096 | 3.87% | 1,531,151 | Shares | 2026-08-13 | |
| Mega MORGAN STANLEY Holding company | $802,149 | 3.40% | 1,343,636 | Shares | 2026-08-13 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $743,352 | 3.15% | 1,245,147 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $741,513 | 3.14% | 1,242,067 | Shares | 2026-09-02 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $702,680 | 2.98% | 1,177,020 | Shares | 2026-08-12 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $445,982 | 1.89% | 747,039 | Shares | 2026-08-14 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $391,662 | 1.66% | 656,051 | Shares | 2026-08-14 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $382,800 | 1.62% | 641,208 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $343,946 | 1.46% | 576,125 | Shares | 2026-08-13 | |
| Mega STATE STREET CORP Bank | $295,485 | 1.25% | 494,951 | Shares | 2026-09-22 | |
| Large MARSHALL WACE, LLP Exempt adviser | $219,766 | 0.93% | 368,120 | Shares | 2026-08-13 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $148,653 | 0.63% | 249,000 | Call | 2026-09-02 | |
| Mid XTX Topco Ltd | $135,326 | 0.57% | 226,678 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $131,424 | 0.56% | 220,141 | Shares | 2026-08-13 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $123,858 | 0.52% | 207,468 | Shares | 2026-08-14 | |
| Mega JANE STREET GROUP, LLC | $106,624 | 0.45% | 178,600 | Call | 2026-08-14 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $98,637 | 0.42% | 165,222 | Shares | 2026-08-13 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $92,415 | 0.39% | 154,800 | Call | 2026-08-14 | |
| Mega JPMORGAN CHASE & CO Bank | $89,947 | 0.38% | 150,666 | Shares | 2026-08-12 | |
| Mid GROUP ONE TRADING LLC Broker-dealer | $82,910 | 0.35% | 138,878 | Shares | 2026-08-14 | |
| Mega Qube Research & Technologies Ltd Exempt adviser | $75,816 | 0.32% | 126,996 | Shares | 2026-08-14 | |
| Large HRT FINANCIAL LP | $75,628 | 0.32% | 126,681 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $69,550 | 0.29% | 116,500 | Put | 2026-08-14 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $54,243 | 0.23% | 90,861 | Shares | 2026-08-11 | |
| Mega HSBC HOLDINGS PLC | $39,512 | 0.17% | 66,185 | Shares | 2026-08-14 | |
| Large Mariner, LLC Registered adviser | $35,018 | 0.15% | 58,658 | Shares | 2026-08-13 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $34,148 | 0.14% | 57,200 | Put | 2026-09-02 | |
| Small HOHIMER WEALTH MANAGEMENT, LLC Registered adviser | $32,835 | 0.14% | 55,000 | Shares | 2026-08-03 | |
| Large MERCER GLOBAL ADVISORS INC /ADV Registered adviser | $31,958 | 0.14% | 53,531 | Shares | 2026-08-19 | |
| Mid KINGSWOOD WEALTH ADVISORS, LLC Registered adviser | $31,044 | 0.13% | 52,000 | Shares | 2026-07-27 | |
| Large Schonfeld Strategic Advisors LLC Registered adviser | $30,375 | 0.13% | 50,880 | Shares | 2026-08-14 | |
| Mid ADAR1 Capital Management, LLC Registered adviser | $30,258 | 0.13% | 50,685 | Shares | 2026-08-14 | |
| Small Alpha Wealth Funds, LLC Registered adviser | $29,850 | 0.13% | 50,000 | Shares | 2026-08-11 | |
| Mid Tower Research Capital LLC (TRC) | $29,114 | 0.12% | 48,768 | Shares | 2026-08-11 | |
| Mid Virtu Financial LLC | $28,011 | 0.12% | 46,921 | Shares | 2026-08-13 | |
| Mega Creative Planning Registered adviser | $24,831 | 0.11% | 41,593 | Shares | 2026-08-13 | |
| Large Point72 Asset Management, L.P. Registered adviser | $22,254 | 0.09% | 37,278 | Shares | 2026-08-14 | |
| Small Hobbs Group Advisors, LLC | $21,487 | 0.09% | 35,992 | Shares | 2026-08-13 | |
| Mega LPL Financial LLC Broker-dealer | $21,222 | 0.09% | 35,549 | Shares | 2026-08-07 | |
| Large CAPTRUST FINANCIAL ADVISORS Registered adviser | $20,265 | 0.09% | 33,946 | Shares | 2026-08-13 | |
| Mega Vanguard Global Advisers, LLC Registered adviser | $19,948 | 0.08% | 33,414 | Shares | 2026-08-13 | |
| Mega BARCLAYS PLC Bank | $18,524 | 0.08% | 31,029 | Shares | 2026-08-14 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $18,155 | 0.08% | 30,412 | Shares | 2026-08-12 | |
| Large Cerity Partners LLC Registered adviser | $17,450 | 0.07% | 29,232 | Shares | 2026-08-14 | |
| Large Rockefeller Capital Management L.P. Registered adviser | $16,786 | 0.07% | 28,118 | Shares | 2026-08-13 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $14,957 | 0.06% | 25,055 | Shares | 2026-08-13 | |
| Large Balyasny Asset Management L.P. Registered adviser | $13,739 | 0.06% | 23,015 | Shares | 2026-08-14 | |
| Large Steward Partners Investment Advisory, LLC Registered adviser | $11,701 | 0.05% | 19,600 | Shares | 2026-08-13 | |
| Large MAI Capital Management Registered adviser | $10,057 | 0.04% | 16,846 | Shares | 2026-08-14 | |
| Mega RAYMOND JAMES FINANCIAL INC | $10,029 | 0.04% | 16,801 | Shares | 2026-08-14 | |
| Large Arax Advisory Partners Registered adviser | $9,884 | 0.04% | 16,557 | Shares | 2026-08-10 | |
| Mega JANE STREET GROUP, LLC | $8,955 | 0.04% | 15,000 | Put | 2026-08-14 | |
| Large Vanguard Personalized Indexing Management, LLC Registered adviser | $8,894 | 0.04% | 14,899 | Shares | 2026-08-11 | |
| Small DIADEMA PARTNERS LP Registered adviser | $7,462 | 0.03% | 12,500 | Put | 2026-08-14 | |
| Mid TrinityBridge Ltd | $7,343 | 0.03% | 12,300 | Shares | 2026-08-11 | |
| Large TORONTO DOMINION BANK Bank | $7,283 | 0.03% | 12,200 | Call | 2026-08-14 | |
| Mid BRIGHTON JONES LLC Registered adviser | $6,840 | 0.03% | 11,458 | Shares | 2026-08-11 | |
| Mid Gladstone Institutional Advisory LLC Registered adviser | $6,746 | 0.03% | 11,300 | Shares | 2026-07-27 | |
| Large WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | $6,390 | 0.03% | 21,092 | Shares | 2026-10-13 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $3,880 | 0.02% | 6,500 | Shares | 2026-08-14 | |
| Mega ROYAL BANK OF CANADA Bank | $3,578 | 0.02% | 5,996 | Shares | 2026-08-14 | |
| Large Allworth Financial LP | $2,158 | 0.01% | 3,615 | Shares | 2026-08-11 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $1,200 | 0.01% | 2,011 | Shares | 2026-08-13 | |
| Small Vision Retirement, LLC Registered adviser | $895 | 0.00% | 1,500 | Shares | 2026-07-21 | |
| Mega JONES FINANCIAL COMPANIES LLLP | $895 | 0.00% | 1,500 | Shares | 2026-08-14 | |
| Mid MCF Advisors LLC Registered adviser | $835 | 0.00% | 1,400 | Shares | 2026-08-12 | |
| Mega PNC FINANCIAL SERVICES GROUP, INC. Bank | $761 | 0.00% | 1,276 | Shares | 2026-08-07 | |
| Mid EverSource Wealth Advisors, LLC Registered adviser | $685 | 0.00% | 1,149 | Shares | 2026-07-24 | |
| Small Ares Financial Consulting, LLC Registered adviser | $606 | 0.00% | 2,000 | Shares | 2026-10-19 | |
| Small NFSG Corp Registered adviser | $599 | 0.00% | 1,979 | Shares | 2026-10-15 | |
| Mega CITIGROUP INC Bank | $537 | 0.00% | 900 | Shares | 2026-08-03 | |
| Mid ROTHSCHILD INVESTMENT LLC Registered adviser | $528 | 0.00% | 885 | Shares | 2026-08-06 | |
| Mid Clearstead Advisors, LLC Registered adviser | $514 | 0.00% | 861 | Shares | 2026-08-06 | |
| Small FNY Investment Advisers, LLC | $454 | 0.00% | 1,500 | Shares | 2026-10-16 | |
| Small SJS Investment Consulting Inc. Registered adviser | $124 | 0.00% | 208 | Shares | 2026-07-22 | |
| Small True Wealth Design, LLC Registered adviser | $91 | 0.00% | 301 | Shares | 2026-10-13 | |
| Mid Larson Financial Group LLC Registered adviser | $89 | 0.00% | 150 | Shares | 2026-08-14 | |
| Small Essential Partners LLC Registered adviser | $73 | 0.00% | 242 | Shares | 2026-10-14 | |
| Large Farther Finance Advisors, LLC Registered adviser | $34 | 0.00% | 115 | Shares | 2026-10-08 | |
| Small CALDWELL SUTTER CAPITAL, INC. Registered adviser | $31 | 0.00% | 52 | Shares | 2026-08-05 | |
| Mid IFG Advisory, LLC Registered adviser | $29 | 0.00% | 50 | Shares | 2026-08-14 | |
| Small Persistent Asset Partners Ltd Exempt adviser | $16 | 0.00% | 27 | Put | 2026-08-07 | |
| Mega NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | $14 | 0.00% | 25 | Shares | 2026-08-12 | |
| Small FNY Investment Advisers, LLC | $4 | 0.00% | 15 | Put | 2026-10-16 | |
| Small Caitong International Asset Management Co., Ltd | $1 | 0.00% | 1 | Shares | 2026-08-05 | |
| Mid IFP Advisors, Inc Registered adviser | $0 | 0.00% | 1 | Shares | 2026-10-16 |