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ATYR · aTYR PHARMA INC · Holdings

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$0.18 +0.00 (+2.71%)
Market Cap
$17.37M
Shares
98.09M
Volume · Oct 20 1.32M Avg daily vol (3M) 3.24M

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 holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 87
Total Value: $23,606,672
Total Shares: 39,555,673

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 92 13F filers
Top Holder
21.5%
Sep 2023 → Jun 2026 · range 20.3% – 30.6%
of institutional value
Top 5
52.6%
Sep 2023 → Jun 2026 · range 52.6% – 76.1%
of institutional value
Top 10
74.3%
Sep 2023 → Jun 2026 · range 73.9% – 93.7%
of institutional value
HHI
855
Sep 2023 → Jun 2026 · range 855 – 1,654
Broadly held

Who 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%

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, 2026

Measured 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.

Conviction holders
0
0.000% of filers hold it in their top 10
Mar 31, 2026: 0
Holders above 5%
0
median weight 0.000%
Mar 31, 2026: 0
Crowding
15.7%
of shares outstanding, 46th percentile
Mar 31, 2026: 7.28%
Private-fund advisers
12.6%
of shares outstanding
Institutional ownership
39.6%
40.3% of the estimated free float
Top 10 holders
74.8%
of 13F shares, Herfindahl 0.088
Active holders
-24.8%
like-for-like share change of active filers
5% stakes on record
1
0 13D, 1 13G (1 institutional, 0 passive, 0 exempt)
How long holders have held it value-weighted 12.6 quarters
Under 1 year 31.7% 1 to 3 years 22.0% 3 years or more 46.3% Since coverage start 0.000%

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 basis

Estimated, 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 avg cost
$0.83
estimated per share
Mar 31, 2026: $1.48
Quarter-end price
$0.60
implied by 13F values
Estimated gain or loss
-27.9%
price against the estimated cost
Estimated at a loss
100.0%
of costed 13F value

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, 2025
# Company Shared holders
1 TRVI Trevi Therapeutics, Inc. 3
2 DUK Duke Energy CORP 3
3 LOW Lowes Companies Inc 3
4 ABBV AbbVie Inc. 4
5 BAC Bank Of America Corp /De/ 3
6 AMZN Amazon Com Inc 4
7 GOOGL Alphabet Inc. 4
8 PG PROCTER & GAMBLE Co 3
9 LLY ELI LILLY & Co 3
10 WMT Walmart Inc. 3

Shareholder Targets

13F filers that own its peers but not ATYR, quarter ended Sep 30, 2025

Found 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
1 Capital Research Global Investors Adviser, Diversified active $181,737,789,347 18 held
2 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser, Index-like $170,297,381,652 19 held
3 Capital International Investors Adviser, Diversified active $162,075,585,080 14 held
4 Capital World Investors Adviser, Diversified active $157,835,619,048 14 held
5 FRANKLIN RESOURCES INC Adviser, Diversified active $113,484,034,175 19 held
6 Amundi Holding company, Index-like $105,968,507,942 18 held
7 AMERIPRISE FINANCIAL INC Adviser, Diversified active $102,255,269,016 18 held
8 Berkshire Hathaway Inc Insurer, Concentrated $96,496,945,134 4 held
9 Fisher Asset Management, LLC Adviser, Diversified active $90,385,263,681 18 held
10 LILLY ENDOWMENT INC Unknown, Unknown $72,861,153,659 1 held

Fund Ownership of ATYR by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index 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.

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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1339970 CUSIP 002120202 13F (30d) 9 filings 9 filers Visit website Investor relations