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ATYR · NASDAQ · Biotechnology

aTyr Pharma (ATYR)

Develops efzofitimod and tRNA-synthetase-derived therapies for fibrosis and inflammation.

$0.5000
Pre-market+0.00 (+0.20%)
At close$0.4990(+4.72%)

Breakdown13F · 13D/G · Form 4

Insiders5 holders · as of May 28, 20261.03%1.01M shares
Strategic holders3 holders · as of Jun 5, 202622.68%22.24M shares
Otherremainder76.29%74.83M shares

98.09M company shares as of Sep 3, 2026 · holders as of their latest filing

Top shareholders13F · 13D/G · Form 4

HolderStakeSharesEvidence
Federated Hermes, Inc.Strategic
10.75%10.54M13Gfiled Oct 7, 2025
FMR LLCStrategic
6.05%5.94M13Gfiled Jun 5, 2026
BlackRock, Inc.Strategic
5.88%5.76M13Gfiled Jul 17, 2025
Paul SchimmelInsiderdirector
0.79%779,143Form 4filed May 28, 2026
Sanjay ShuklaInsiderdirector, officer: President and CEO
0.16%153,553Form 4filed Feb 4, 2026
Jill Marie BroadfootInsiderofficer: Chief Financial Officer
0.04%37,296Form 4filed Feb 4, 2026
Nancy DenyesInsiderofficer: General Counsel
0.03%33,124Form 4filed Feb 4, 2026
Jane A. GrossInsiderdirector
0.01%9,750Form 4filed Mar 17, 2025
Altium Capital Management, LPInstitution
3.20% of class, as filed13G/Afiled Feb 12, 2021
Alyeska Investment Group, L.P.Institution
8.30% of class, as filed13D/Gfiled Feb 16, 2021
EcoR1 Capital, LLCStrategic
11.00% of class, as filed13G/Afiled Feb 14, 2018
Ikarian Capital, LLCInstitution
5.30% of class, as filed13Gfiled Sep 17, 2021
Laurence W. LyttonInsider
11.00% of class, as filed13Gfiled Feb 22, 2023
Logos Global Management GP LLCStrategic
11.00% of class, as filed13Gfiled Jan 2, 2024
Page 3 of 15 PagesInsider
9.15% of class, as filed13Gfiled Feb 17, 2021
Redmile Group, LLCStrategic
8.52% of class, as filed13Gfiled Mar 8, 2018
Renaissance Technologies LLCInstitution
5.14% of class, as filed13Gfiled Feb 12, 2020
Venrock Healthcare Capital Partners III, L.P.Institution
5.60% of class, as filed13G/Afiled Feb 14, 2022
EcoR1 Capital Fund Qualified, L.P.1Strategic10 percent owner
0.23%229,237Form 4filed Dec 14, 2017
  1. Last filed Dec 14, 2017; leaving the company requires no filing. Not in the bar.

13D/13G — an ownership statement filed at 5% or more · Form 4 — an insider's transaction report

Institutions13F

No 13F holders on record.

Ownership statements13D/G · 5% or more, as filed

Holder% of classSharesFormFiled
Federated Hermes, Inc.10.76%10.54M13GOct 7, 2025
BlackRock, Inc.6.50%5.76M13GJul 17, 2025
Point72 Capital Advisors, Inc.incl. Steven A. Cohen, Point72 Asset Management, L.P.6.20%5.04M13GOct 15, 2024
FMR LLC6.10%5.94M13GJun 5, 2026

Insider tradesForm 4

Latest trades

DateInsiderTypeSharesAvg priceOwned after
May 27, 2026
Paul Schimmeldirector
Purchase100,000$0.4963779,143
Feb 4, 2026
Nancy Denyesofficer: General Counsel
Sale1,118$0.976133,124
Feb 4, 2026
Jill Marie Broadfootofficer: Chief Financial Officer
Sale1,558$0.976037,296
Feb 4, 2026
Sanjay Shukladirector, officer: President and CEO
Sale3,745$0.9760153,553
Oct 8, 2025
Paul Schimmeldirector
Purchase682,001$0.89801,095,024
Oct 9, 2025
Paul Schimmeldirector
Purchase317,999$0.94141,413,023

CongressHouse and Senate disclosures

Not reported.