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Equibles

ATYR

aTYR PHARMA INC

Company with tickers: ATYR

CIK
1339970
CUSIP
002120202
Shares Outstanding
98,051,212
13F Activity (30d)
35 filings 34 filers

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: 86
Total Value: $11,857,351
Total Shares: 15,201,791

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 86 13F filers · Δ vs Dec 31, 2025
Top Holder
25.1%
Jun 2023 → Mar 2026 · range 19.8% – 32.7%
+5.3 pts
Top 5
70.9%
Jun 2023 → Mar 2026 · range 58.1% – 81.2%
+0.6 pts
Top 10
90.1%
Jun 2023 → Mar 2026 · range 74.2% – 93.7%
−0.5 pts
HHI
1,291
Jun 2023 → Mar 2026 · range 892 – 1,956
Broadly held+120

Quarterly Activity

vs Dec 31, 2025
New
31
Increased
22
Decreased
19
Sold Out
9
Unchanged
14
Holder count: +22
Institutional value: +13.9%
Shares held: +14.3%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega TWO SIGMA INVESTMENTS, LP +690,122 1,144,565
Mega GEODE CAPITAL MANAGEMENT, LLC +101,768 2,385,485
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP +43,001 1,132,344
Mid Belpointe Asset Management LLC +35,300 45,738
Mid XTX Topco Ltd +32,058 111,423

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mid GSA CAPITAL PARTNERS LLP −946,052 1,684,586
Mid Virtu Financial LLC −38,905 40,048
Mid SIMPLEX TRADING, LLC −24,892 1,335
Mega DEUTSCHE BANK AG\ −17,015 103,326
Mid GROUP ONE TRADING LLC −7,034 184,014

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 3,812,132 $2,973,462
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
Small Redhawk Wealth Advisors, Inc. 49,150 $38,337

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega UBS Group AG 1,625,297 $1,272,607
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
Large SG Americas Securities, LLC 24,032 $18,817
Filter: New 31 Increased 22 Reduced 19 Sold out 9 Unchanged 14
Showing 91 of 91
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega VANGUARD CAPITAL MANAGEMENT LLC $2,973,462 25.08% 3,812,132
Mega GEODE CAPITAL MANAGEMENT, LLC $1,860,677 15.69% 2,385,485
Mega STATE STREET CORP $1,368,431 11.54% 1,754,399
Mid GSA CAPITAL PARTNERS LLP $1,313,977 11.08% 1,684,586
Mega TWO SIGMA INVESTMENTS, LP $892,760 7.53% 1,144,565
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $676,060 5.70% 866,744
Mega NORTHERN TRUST CORP Bank $554,660 4.68% 711,105
Mega VANGUARD FIDUCIARY TRUST CO Bank $508,428 4.29% 651,832
Mega Nuveen, LLC $178,840 1.51% 229,284
Mid GROUP ONE TRADING LLC $143,530 1.21% 184,014
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $127,062 1.07% 162,900
Large MARSHALL WACE, LLP $107,731 0.91% 138,118
Mid XTX Topco Ltd $86,909 0.73% 111,423
Mega DEUTSCHE BANK AG\ Bank $80,593 0.68% 103,326
Mega RHUMBLINE ADVISERS $80,453 0.68% 103,146
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $80,106 0.68% 102,700
Small HOHIMER WEALTH MANAGEMENT, LLC $78,000 0.66% 100,000
Mid KINGSWOOD WEALTH ADVISORS, LLC $40,560 0.34% 52,000
Small Redhawk Wealth Advisors, Inc. $38,337 0.32% 49,150
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $35,936 0.30% 46,073
Mid Belpointe Asset Management LLC $35,675 0.30% 45,738
Mid Virtu Financial LLC $31,237 0.26% 40,048
Large CWM, LLC $28,087 0.24% 36,010
Mega LPL Financial LLC $27,728 0.23% 35,549
Large SEI INVESTMENTS CO $26,386 0.22% 33,829
Mega Vanguard Global Advisers, LLC $26,062 0.22% 33,414
Large Rockefeller Capital Management L.P. $21,932 0.18% 28,118
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $21,450 0.18% 27,500
Mid INTECH INVESTMENT MANAGEMENT LLC $20,425 0.17% 26,187
Large Police & Firemen's Retirement System of New Jersey Pension $20,343 0.17% 26,081
Mega BNP PARIBAS ARBITRAGE, SA $19,716 0.17% 25,278
Mega NEUBERGER BERMAN GROUP LLC $16,959 0.14% 21,743
Mid RBF Capital, LLC $15,600 0.13% 20,000
Micro Hobbs Group Advisors, LLC $15,146 0.13% 19,419
Mega HSBC HOLDINGS PLC $14,206 0.12% 18,214
Mid Tower Research Capital LLC (TRC) $13,592 0.11% 17,426
Mid Vanguard Personalized Indexing Management, LLC $13,001 0.11% 16,669
Small TRUST CO OF TOLEDO NA /OH/ Bank $12,979 0.11% 16,640
Mega RAYMOND JAMES FINANCIAL INC $12,948 0.11% 16,601
Large Steward Partners Investment Advisory, LLC $12,948 0.11% 16,600
Mid TrinityBridge Ltd $12,636 0.11% 16,200
Large CAPTRUST FINANCIAL ADVISORS $12,465 0.11% 15,982
Large WEALTH ENHANCEMENT ADVISORY SERVICES, LLC $12,150 0.10% 15,578
Large MERCER GLOBAL ADVISORS INC /ADV $11,859 0.10% 15,205
Large ProShare Advisors LLC $10,845 0.09% 13,905
Mid MAI Capital Management $10,533 0.09% 13,504
Mid Crossmark Global Holdings, Inc. $9,879 0.08% 12,666
Small DIADEMA PARTNERS LP $9,750 0.08% 12,500
Small Pasadena Private Wealth, LLC $9,537 0.08% 12,228
Small DIADEMA PARTNERS LP $9,516 0.08% 12,200
Mid Apollon Wealth Management, LLC $9,282 0.08% 11,900
Large Russell Investments Group, Ltd. $8,860 0.07% 11,361
Mid Gladstone Institutional Advisory LLC $8,814 0.07% 11,300
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $8,230 0.07% 10,552
Large Creative Planning $8,196 0.07% 10,508
Large VOYA INVESTMENT MANAGEMENT LLC $8,063 0.07% 10,338
Mid Ameritas Investment Partners, Inc. $6,927 0.06% 8,881
Mega PNC FINANCIAL SERVICES GROUP, INC. $6,392 0.05% 8,196
Mega Legal & General Group Plc $6,177 0.05% 7,920
Mid GAMMA Investing LLC $6,036 0.05% 7,739
Micro My Portfolio Guide, LLC $5,460 0.05% 7,000
Mid IFP Advisors, Inc $4,680 0.04% 6,001
Mega CITIGROUP INC $4,594 0.04% 5,891
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $4,048 0.03% 5,190
Large OSAIC HOLDINGS, INC. $3,900 0.03% 5,000
Small NFSG Corp $1,621 0.01% 2,079
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $1,568 0.01% 2,011
Micro Ares Financial Consulting, LLC $1,560 0.01% 2,000
Small Essential Partners LLC $1,262 0.01% 1,618
Small Vision Retirement, LLC Pension $1,170 0.01% 1,500
Large JONES FINANCIAL COMPANIES LLLP $1,170 0.01% 1,500
Small FNY Investment Advisers, LLC $1,170 0.01% 1,500
Small TOTH FINANCIAL ADVISORY CORP $1,092 0.01% 1,400
Mid SIMPLEX TRADING, LLC $1,041 0.01% 1,335
Mid Farther Finance Advisors, LLC $1,029 0.01% 1,320
Large NISA INVESTMENT ADVISORS, LLC $759 0.01% 974
Mid Sterling Capital Management LLC $578 0.00% 742
Mid EverSource Wealth Advisors, LLC $323 0.00% 415
Small MCF Advisors LLC $312 0.00% 400
Mid Allworth Financial LP $285 0.00% 366
Mid ROTHSCHILD INVESTMENT LLC $223 0.00% 287
Micro Wealth Preservation Advisors, LLC $122 0.00% 157
Mid Larson Financial Group LLC $117 0.00% 150
Micro True Wealth Design, LLC $56 0.00% 72
Small CALDWELL SUTTER CAPITAL, INC. $40 0.00% 52
Small SJS Investment Consulting Inc. $32 0.00% 42
Small Persistent Asset Partners Ltd $21 0.00% 28
Small Persistent Asset Partners Ltd $21 0.00% 27
Small FNY Investment Advisers, LLC $11 0.00% 15
Small Root Financial Partners, LLC $7 0.00% 9
Small Caitong International Asset Management Co., Ltd $0 0.00% 1

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