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RNA · Atrium Therapeutics, Inc. · Holdings

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$8.27 +0.22 (+2.73%)
Russell 2000 member Rebalance outlook locked
Market Cap
$137.70M
Shares
17.11M
Volume · Oct 27 48.19K Avg daily vol (3M) 264.95K

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.

Use institutional holdings through the 13F API or MCP → See every holder of RNA: 13F, 13D and 13G, insiders and funds →
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: 153
Total Value: $203,349,499
Total Shares: 15,147,019
Showing 1–100 of 158 holdings by value · page 1 of 2

Institutional Ownership Trend

3 quarters

Holder Concentration

Across 156 13F filers
Top Holder
9.8%
Mar 2026 → Jun 2026 · range 9.7% – 9.8%
of institutional value
Top 5
39.3%
Mar 2026 → Jun 2026 · range 32.9% – 39.3%
of institutional value
Top 10
54.0%
Mar 2026 → Jun 2026 · range 49.7% – 54.0%
of institutional value
HHI
423
Mar 2026 → Jun 2026 · range 348 – 423
Broadly held

Who Holds RNA

Last 3 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: 154 filers, like-for-like change -4.5%; actively managed books -8.0%; index-like books +9.3%.

Holder type Share Filers Change
Registered adviser 68.3% 81 -0.6%
Exempt adviser 1.4% 4 -18.9%
Adviser 1.3% 3 -70.6%
Bank 4.3% 13 -4.3%
Broker-dealer 0.1% 2 +431.9%
Benefit plan 0.0% 2 +6.6%
Non-US 2.5% 11 -54.0%
Holding company 13.8% 6 +0.7%
Unknown 8.3% 32 +15.9%

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 3 holders with no observed 2026-03-31 13F and 1 holder with no observed 2026-06-30 13F. Compared across CIK changes: JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.

Conviction and Crowding

154 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
2
1.30% of filers hold it in their top 10
Mar 31, 2026: 4
Holders above 5%
1
median weight 0.000%
Mar 31, 2026: 0
Crowding
51.7%
of shares outstanding, 98th percentile
Private-fund advisers
49.0%
of shares outstanding
Institutional ownership
83.8%
87.5% of the estimated free float
Top 10 holders
53.7%
of 13F shares, Herfindahl 0.044
Active holders
-8.0%
like-for-like share change of active filers
5% stakes on record
3
0 13D, 3 13G (3 institutional, 0 passive, 0 exempt)
How long holders have held it value-weighted 1.9 quarters
Under 1 year 100.0% 1 to 3 years 0.000% 3 years or more 0.000% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $8,347,135 (1 buying, 1 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
$13.77
estimated per share
Mar 31, 2026: $14.05
Quarter-end price
$13.45
implied by 13F values
Estimated gain or loss
-2.3%
price against the estimated cost
Estimated at a loss
74.2%
of costed 13F value

Estimated cost covers 92.3% 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 RNA's active holders also own, quarter ended Jun 30, 2026
# Company Shared holders
1 SRG Seritage Growth Properties 4
2 ELME Elme Communities 4
3 BHF Brighthouse Financial, Inc. 6
4 AVNS Avanos Medical, Inc. 4
5 BLD QXO Insulation, LLC 6
6 OGN Organon & Co. 5
7 APGE Apogee Therapeutics, Inc. 6
8 JHG Janus Henderson Group Ltd. 5
9 ROKU Roku, Inc 9
10 AQST Aquestive Therapeutics, Inc. 3

Shareholder Targets

13F filers that own its peers but not RNA, quarter ended Jun 30, 2026

Found through its holder-overlap peers: SRG, ELME, BHF, AVNS, BLD, OGN, APGE, JHG, ROKU, AQST, PZZA, LION, GSAT, LBRDK, WBD, TALK, NKTR, GEF, PEN, EA. 2,005 filers in all.

# Filer In peers
1 Pentwater Capital Management LP Registered adviser, Concentrated $5,280,364,059 8 held
2 PUBLIC INVESTMENT FUND Unknown, Concentrated $5,086,618,377 1 held
3 HBK INVESTMENTS L P Registered adviser, Concentrated $3,629,756,890 8 held
4 FARALLON CAPITAL MANAGEMENT LLC Registered adviser, Diversified active $1,623,814,280 1 held
5 Qube Research & Technologies Ltd Exempt adviser, Systematic-like $1,598,728,950 16 held
6 DIMENSIONAL FUND ADVISORS LP Registered adviser, Diversified active $1,541,212,061 16 held
7 TRIAN FUND MANAGEMENT, L.P. Registered adviser, Concentrated $1,332,745,144 1 held
8 D. E. Shaw & Co., Inc. Unknown, Systematic-like $1,254,751,298 16 held
9 Venrock Adviser, LLC Registered adviser, Concentrated $1,127,318,496 1 held
10 AQR Arbitrage LLC Registered adviser, Diversified active $1,086,564,245 14 held

Fund Ownership of RNA by Fund Type

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

Index funds and index ETFs hold 11.21% of shares outstanding.

Fund type Of shares outstanding Shares
Index funds 2.67% 456,837
Index ETFs 8.54% 1,461,002
Active ETFs 0.76% 130,068
Active funds 9.41% 1,609,473
Unclassified 0.05% 8,533
All registered funds 21.43% 3,665,913
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 type: Registered adviser 80 Exempt adviser 3 Adviser 3 Bank 13 Broker-dealer 2 Benefit plan 2 Non-US 11 Holding company 6 Unknown 33
Showing 100 of 158
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Sessa Capital IM, L.P. $20,175,000 9.92% 1,500,000
PRICE T ROWE ASSOCIATES INC /MD/ $19,811,634 9.74% 1,472,984
BlackRock, Inc. $19,468,547 9.57% 1,447,476
SUSQUEHANNA INTERNATIONAL GROUP, LLP $11,306,070 5.56% 840,600
VANGUARD CAPITAL MANAGEMENT LLC $9,829,676 4.83% 730,831
CRCM LP $8,628,699 4.24% 641,539
TIG Advisors, LLC $7,552,618 3.71% 561,533
GEODE CAPITAL MANAGEMENT, LLC $5,204,194 2.56% 386,929
TWO SIGMA INVESTMENTS, LP $4,646,719 2.29% 345,481
GOLDMAN SACHS GROUP INC $4,174,086 2.05% 310,341
683 Capital Management, LLC $4,035,000 1.98% 300,000
STATE STREET CORP $3,655,198 1.80% 271,762
Arbiter Partners Capital Management LLC $3,514,323 1.73% 261,288
CANTOR FITZGERALD, L. P. $3,455,533 1.70% 256,917
Slotnik Capital, LLC $3,196,217 1.57% 237,637
Weiss Asset Management LP $2,955,368 1.45% 219,730
MILLENNIUM MANAGEMENT LLC $2,697,518 1.33% 200,559
Schonfeld Strategic Advisors LLC $2,678,675 1.32% 199,158
AQR CAPITAL MANAGEMENT LLC $2,316,558 1.14% 172,235
NEXPOINT ASSET MANAGEMENT, L.P. $2,017,835 0.99% 150,025
Polar Asset Management Partners Inc. $2,017,500 0.99% 150,000
Squarepoint Ops LLC $1,973,693 0.97% 146,743
Bracebridge Capital, LLC $1,872,764 0.92% 139,239
NOMURA HOLDINGS INC $1,847,949 0.91% 137,394
Yakira Capital Management, Inc. $1,789,482 0.88% 133,047
BANK OF AMERICA CORP /DE/ $1,786,603 0.88% 132,833
CHARLES SCHWAB INVESTMENT MANAGEMENT INC $1,751,418 0.86% 130,217
TUDOR INVESTMENT CORP ET AL $1,742,998 0.86% 129,591
DAFNA Capital Management LLC $1,721,600 0.85% 128,000
Creek Drive Management Group LLC $1,716,220 0.84% 127,600
NORGES BANK $1,702,433 0.84% 126,575
Anson Funds Management LP $1,681,250 0.83% 125,000
NORTHERN TRUST CORP $1,611,053 0.79% 119,781
ExodusPoint Capital Management, LP $1,577,348 0.78% 117,275
TD Asset Management Inc $1,495,640 0.74% 111,200
VANGUARD FIDUCIARY TRUST CO $1,478,975 0.73% 109,961
JANE STREET GROUP, LLC $1,476,943 0.73% 109,810
Athos Capital Ltd $1,452,129 0.71% 107,965
AWM Investment Company, Inc. $1,445,875 0.71% 107,500
Balyasny Asset Management L.P. $1,424,018 0.70% 105,875
Marble Bar Asset Management LLP $1,396,769 0.69% 103,849
VANGUARD PORTFOLIO MANAGEMENT LLC $1,361,072 0.67% 101,195
BlueCrest Capital Management Ltd $1,345,000 0.66% 100,000
ADAGE CAPITAL PARTNERS GP, L.L.C. $1,345,000 0.66% 100,000
CREDIT INDUSTRIEL ET COMMERCIAL $1,206,774 0.59% 89,723
Groupe la Francaise $1,079,671 0.53% 80,273
FIL Ltd $1,028,925 0.51% 76,500
Caption Management, LLC $1,012,475 0.50% 75,277
CITADEL ADVISORS LLC $909,744 0.45% 67,639
MANUFACTURERS LIFE INSURANCE COMPANY, THE $845,372 0.42% 62,853
Caption Management, LLC $817,760 0.40% 60,800
ADAR1 Capital Management, LLC $775,903 0.38% 57,688
FRANKLIN RESOURCES INC $762,600 0.38% 56,699
JACOBS LEVY EQUITY MANAGEMENT, INC $726,192 0.36% 53,992
ODDO BHF ASSET MANAGEMENT SAS $606,460 0.30% 45,090
CAXTON ASSOCIATES LLP $594,893 0.29% 44,230
ALETHEA CAPITAL MANAGEMENT, LLC $588,545 0.29% 43,758
CANADA PENSION PLAN INVESTMENT BOARD $564,496 0.28% 41,970
MORGAN STANLEY $564,117 0.28% 41,942
Saba Capital Management, L.P. $533,158 0.26% 39,640
Bank of New York Mellon Corp $527,937 0.26% 39,252
Trium Capital LLP $483,402 0.24% 58,382
KENNEDY CAPITAL MANAGEMENT LLC $470,467 0.23% 34,979
FMR LLC $451,004 0.22% 33,532
BOUSSARD & GAVAUDAN GESTION SAS $441,765 0.22% 32,845
LMR Partners LLP $437,125 0.21% 32,500
LOS ANGELES CAPITAL MANAGEMENT LLC $423,365 0.21% 31,477
Nuveen, LLC $417,904 0.21% 31,071
Jump Financial, LLC $417,178 0.21% 31,017
Quantinno Capital Management LP $368,772 0.18% 27,418
Twin Securities, Inc. $356,653 0.18% 26,517
Odyssean, LLC $285,583 0.14% 21,233
Walleye Trading LLC $281,105 0.14% 20,900
Brevan Howard Capital Management LP $280,217 0.14% 20,834
Fractal Investments LLC $269,000 0.13% 20,000
UBS Group AG $263,243 0.13% 19,572
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND $250,035 0.12% 18,590
Vestcor Inc $235,361 0.12% 17,499
WELLS FARGO & COMPANY/MN $234,714 0.12% 17,451
ALLIANCEBERNSTEIN L.P. $230,129 0.11% 17,110
RHUMBLINE ADVISERS $222,987 0.11% 16,579
BLUEFIN CAPITAL MANAGEMENT, LLC $215,347 0.11% 16,011
RENAISSANCE TECHNOLOGIES LLC $201,359 0.10% 14,971
DEUTSCHE BANK AG\ $201,305 0.10% 14,967
Invesco Ltd. $190,638 0.09% 14,174
Jupiter Topco LLC $186,053 0.09% 13,833
AlphaCentric Advisors LLC $181,279 0.09% 13,478
AXQ CAPITAL, LP $153,020 0.08% 11,377
KESTRA PRIVATE WEALTH SERVICES, LLC $139,476 0.07% 10,370
MetLife Investment Management, LLC $138,306 0.07% 10,283
Corsicana & Co. $132,079 0.06% 9,820
JPMORGAN CHASE & CO $126,267 0.06% 9,388
BNP PARIBAS ARBITRAGE, SA $106,268 0.05% 7,901
WEALTH ENHANCEMENT ADVISORY SERVICES, LLC $96,950 0.05% 11,709
CITIGROUP INC $89,913 0.04% 6,685
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. $88,796 0.04% 6,602
Vanguard Global Advisers, LLC $75,118 0.04% 5,585
Walleye Trading LLC $67,250 0.03% 5,000
Russell Investments Group, Ltd. $60,185 0.03% 4,475
Skandinaviska Enskilda Banken AB (publ) $59,180 0.03% 4,400

Showing the top 100 of 158 holders. Create a free account to see every holder, past quarters, search, filters and CSV export.

Key facts CIK 2093101 CUSIP 04965N104 13F (30d) 13 filings 13 filers Visit website Investor relations