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ATYR

aTYR PHARMA INC
$0.65 +0.06 (+10.27%) At close · Jul 6
Market Cap
$64.12M
Shares
98,051,212

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.

Holders: 112
Total Value: $43,981,208
Total Shares: 56,386,257
Showing 1–100 of 120 holdings by value · page 1 of 2

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 112 13F filers · Δ vs Dec 31, 2025
Top Holder
26.1%
Jun 2023 → Mar 2026 · range 20.3% – 32.7%
−0.2 pts
Top 5
69.8%
Jun 2023 → Mar 2026 · range 57.8% – 81.2%
−0.6 pts
Top 10
85.2%
Jun 2023 → Mar 2026 · range 73.8% – 93.7%
+0.3 pts
HHI
1,315
Jun 2023 → Mar 2026 · range 883 – 1,956
Broadly held−26

Quarterly Activity

vs Dec 31, 2025
New
35
Increased
27
Decreased
32
Sold Out
10
Unchanged
18
Holder count: +25
Institutional value: +0.5%
Shares held: +0.8%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega UBS Group AG +2,241,916 3,867,213
Mega TWO SIGMA INVESTMENTS, LP +690,122 1,144,565
Mega BANK OF AMERICA CORP /DE/ +176,859 303,559
Mega GEODE CAPITAL MANAGEMENT, LLC +101,768 2,385,485
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP +43,001 1,132,344

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mid GSA CAPITAL PARTNERS LLP −946,052 1,684,586
Mega AQR CAPITAL MANAGEMENT LLC −273,802 496,018
Mega CITADEL ADVISORS LLC −177,628 203,372
Mega MORGAN STANLEY −177,542 1,225,467
Mega BARCLAYS PLC −129,059 45,123

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 3,812,132 $2,973,462
Mega MILLENNIUM MANAGEMENT LLC 1,641,246 $1,280,171
Mega VANGUARD FIDUCIARY TRUST CO 651,832 $508,428
Large MARSHALL WACE, LLP 138,118 $107,731
Small HOHIMER WEALTH MANAGEMENT, LLC 100,000 $78,000

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 4,961,871 $3,885,144
Small Rosalind Advisors, Inc. 1,039,080 $813,599
Large TWO SIGMA ADVISERS, LP 841,350 $658,777
Small Tikvah Management LLC 460,833 $360,832
Small TWO SIGMA SECURITIES, LLC 39,006 $30,541
Filter: New 35 Increased 27 Reduced 32 Sold out 10 Unchanged 18
Showing 100 of 120
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Mega FMR LLC $11,471,337 26.08% 14,706,843
Large FEDERATED HERMES, INC. $8,197,548 18.64% 10,509,678
Mega BlackRock, Inc. $5,026,242 11.43% 6,443,904
Mega UBS Group AG $3,016,426 6.86% 3,867,213
Mega VANGUARD CAPITAL MANAGEMENT LLC $2,973,462 6.76% 3,812,132
Mega GEODE CAPITAL MANAGEMENT, LLC $1,860,677 4.23% 2,385,485
Mega STATE STREET CORP $1,368,431 3.11% 1,754,399
Mid GSA CAPITAL PARTNERS LLP $1,313,977 2.99% 1,684,586
Mega MILLENNIUM MANAGEMENT LLC $1,280,171 2.91% 1,641,246
Mega MORGAN STANLEY $955,862 2.17% 1,225,467
Mega TWO SIGMA INVESTMENTS, LP $892,760 2.03% 1,144,565
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $676,060 1.54% 866,744
Mega NORTHERN TRUST CORP Bank $554,660 1.26% 711,105
Mega VANGUARD FIDUCIARY TRUST CO Bank $508,428 1.16% 651,832
Mega AQR CAPITAL MANAGEMENT LLC $386,891 0.88% 496,018
Mega JANE STREET GROUP, LLC $353,262 0.80% 452,900
Mega BANK OF AMERICA CORP /DE/ Bank $236,775 0.54% 303,559
Mega GOLDMAN SACHS GROUP INC $220,923 0.50% 283,236
Mega Nuveen, LLC $178,840 0.41% 229,284
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $164,374 0.37% 210,737
Mega Bank of New York Mellon Corp Bank $150,952 0.34% 193,531
Mid GROUP ONE TRADING LLC $143,530 0.33% 184,014
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $127,062 0.29% 162,900
Large MARSHALL WACE, LLP $107,731 0.24% 138,118
Mid XTX Topco Ltd $86,909 0.20% 111,423
Mega CITADEL ADVISORS LLC $84,396 0.19% 108,200
Mega DEUTSCHE BANK AG\ Bank $80,593 0.18% 103,326
Mega RHUMBLINE ADVISERS $80,453 0.18% 103,146
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $80,106 0.18% 102,700
Small HOHIMER WEALTH MANAGEMENT, LLC $78,000 0.18% 100,000
Mega DIMENSIONAL FUND ADVISORS LP $71,658 0.16% 91,871
Mega VICTORY CAPITAL MANAGEMENT INC $68,980 0.16% 88,436
Mega ALLIANCEBERNSTEIN L.P. $50,294 0.11% 64,480
Mid KINGSWOOD WEALTH ADVISORS, LLC $40,560 0.09% 52,000
Mid ADAR1 Capital Management, LLC $39,534 0.09% 50,685
Small Redhawk Wealth Advisors, Inc. $38,337 0.09% 49,150
Mega JANE STREET GROUP, LLC $37,830 0.09% 48,502
Mega CITADEL ADVISORS LLC $37,284 0.08% 47,800
Mega CITADEL ADVISORS LLC $36,950 0.08% 47,372
Mega WELLS FARGO & COMPANY/MN $36,300 0.08% 46,540
Mega Invesco Ltd. $36,155 0.08% 46,354
Mega PRICE T ROWE ASSOCIATES INC /MD/ $35,978 0.08% 46,126
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $35,936 0.08% 46,073
Mid Belpointe Asset Management LLC $35,675 0.08% 45,738
Mega BARCLAYS PLC $35,195 0.08% 45,123
Mega JPMORGAN CHASE & CO $32,749 0.07% 41,987
Large RENAISSANCE TECHNOLOGIES LLC $31,607 0.07% 40,522
Mid Virtu Financial LLC $31,237 0.07% 40,048
Large CWM, LLC $28,087 0.06% 36,010
Mega LPL Financial LLC $27,728 0.06% 35,549
Large SEI INVESTMENTS CO $26,386 0.06% 33,829
Mega Vanguard Global Advisers, LLC $26,062 0.06% 33,414
Large Rockefeller Capital Management L.P. $21,932 0.05% 28,118
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $21,450 0.05% 27,500
Mid INTECH INVESTMENT MANAGEMENT LLC $20,425 0.05% 26,187
Large Police & Firemen's Retirement System of New Jersey Pension $20,343 0.05% 26,081
Mega BNP PARIBAS ARBITRAGE, SA $19,716 0.04% 25,278
Mega NEUBERGER BERMAN GROUP LLC $16,959 0.04% 21,743
Mid RBF Capital, LLC $15,600 0.04% 20,000
Micro Hobbs Group Advisors, LLC $15,146 0.03% 19,419
Mega HSBC HOLDINGS PLC $14,206 0.03% 18,214
Mid Tower Research Capital LLC (TRC) $13,592 0.03% 17,426
Mid Vanguard Personalized Indexing Management, LLC $13,001 0.03% 16,669
Small TRUST CO OF TOLEDO NA /OH/ Bank $12,979 0.03% 16,640
Mega RAYMOND JAMES FINANCIAL INC $12,948 0.03% 16,601
Large Steward Partners Investment Advisory, LLC $12,948 0.03% 16,600
Mid TrinityBridge Ltd $12,636 0.03% 16,200
Large CAPTRUST FINANCIAL ADVISORS $12,465 0.03% 15,982
Large WEALTH ENHANCEMENT ADVISORY SERVICES, LLC $12,150 0.03% 15,578
Large MERCER GLOBAL ADVISORS INC /ADV $11,859 0.03% 15,205
Large PRUDENTIAL FINANCIAL INC $11,434 0.03% 14,660
Large ProShare Advisors LLC $10,845 0.02% 13,905
Mid MAI Capital Management $10,533 0.02% 13,504
Mid Crossmark Global Holdings, Inc. $9,879 0.02% 12,666
Small DIADEMA PARTNERS LP $9,750 0.02% 12,500
Small Pasadena Private Wealth, LLC $9,537 0.02% 12,228
Small DIADEMA PARTNERS LP $9,516 0.02% 12,200
Mid Apollon Wealth Management, LLC $9,282 0.02% 11,900
Large Russell Investments Group, Ltd. $8,860 0.02% 11,361
Mid Gladstone Institutional Advisory LLC $8,814 0.02% 11,300
Mega ROYAL BANK OF CANADA Bank $8,693 0.02% 11,146
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $8,230 0.02% 10,552
Large Creative Planning $8,196 0.02% 10,508
Large VOYA INVESTMENT MANAGEMENT LLC $8,063 0.02% 10,338
Large Balyasny Asset Management L.P. $8,057 0.02% 10,330
Mid Ameritas Investment Partners, Inc. $6,927 0.02% 8,881
Mega PNC FINANCIAL SERVICES GROUP, INC. $6,392 0.01% 8,196
Mega Legal & General Group Plc $6,177 0.01% 7,920
Mid GAMMA Investing LLC $6,036 0.01% 7,739
Micro My Portfolio Guide, LLC $5,460 0.01% 7,000
Mid IFP Advisors, Inc $4,680 0.01% 6,001
Mega CITIGROUP INC $4,594 0.01% 5,891
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $4,048 0.01% 5,190
Large OSAIC HOLDINGS, INC. $3,900 0.01% 5,000
Small NFSG Corp $1,621 0.00% 2,079
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $1,568 0.00% 2,011
Micro Ares Financial Consulting, LLC $1,560 0.00% 2,000
Small Essential Partners LLC $1,262 0.00% 1,618
Small Vision Retirement, LLC Pension $1,170 0.00% 1,500
Large JONES FINANCIAL COMPANIES LLLP $1,170 0.00% 1,500
Key facts CIK 1339970 CUSIP 002120202 Visit website Investor relations

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