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Atrium Therapeutics, Inc. 13F holders

154 funds reported a position in Atrium Therapeutics, Inc. in their 13F for the quarter ended 30 June 2026, together 15.8 million shares worth $211.9 million. Against the quarter before, 35 opened a position, 44 added, 35 trimmed and 45 sold out; together they bought a net 53,924 shares. The largest holders: Sessa Capital IM, L.P., Price T Rowe Associates Inc. and BlackRock, Inc.

Funds holding154-9 on Q1 2026
Shares they held15.8Mworth $211.9 million
Net bought on the quarter53,924 sharesabout $725,300 at the funds' values
Funds buying to selling79 to 80opened or added, to cut or sold
Opened 35Added 44Held 37Trimmed 35Sold out 45
Opened: 35 fundsAdded: 44 fundsHeld: 37 fundsTrimmed: 35 fundsSold out: 45 funds

What each fund did in RNA against its 13F for the quarter before; a change under 0.1% of a holding counts as held

Q1 2026: 163 funds, 14.8 million shares163Q1 2026Q2 2026: 154 funds, 15.8 million shares154Q2 2026

Funds reporting a position in RNA in their 13F, each quarter; hover a bar for the shares they held

Filed so far for the quarter to 30 September 2026

3,405 funds have filed their 13F for the quarter so far; the rest are due by 16 November 2026. Of those, 18 reported a position in Atrium Therapeutics, Inc.: 2 opened one, 9 added, 5 trimmed and 8 sold out, a net 128,212 shares sold.

FundChange in sharesShares nowStatusFiling
Trium Capital LLP-54,89658,382trimmed13F
Wealth Enhancement Advisory Services, LLC+11,70911,709new13F
Kestra Private Wealth Services, LLC+1,71012,080added13F
Strs Ohio+1,1003,700added13F
Versant Capital Management, Inc+666931added13F
Sterling Capital Management LLC+290415added13F
Essential Partners LLC-20979trimmed13F
Gamma Investing LLC+174369added13F
True Wealth Design, LLC-17241trimmed13F
Pinnacle Wealth Planning Services, Inc.+105115added13F
Farther Finance Advisors, LLC-10218trimmed13F
SJS Investment Consulting Inc.+6473added13F
Parkside Financial Bank & Trust+6060new13F
FNY Investment Advisers, LLC+70330added13F
Fortitude Family Office, LLC-2822trimmed13F
Covestor Ltd+2468added13F
AdvisorNet Financial, Inc-1390sold out13F
Fractal Investments LLC-20,0000sold out13F
Moran Wealth Management, LLC-33,3200sold out13F
Private Wealth Management Group, LLC-750sold out13F
TD Private Client Wealth LLC-740sold out13F
Torren Management, LLC-40sold out13F
Wealth Enhancement Trust Services, Inc.-400sold out13F
Y-Intercept (Hong Kong) Ltd-35,1030sold out13F

The largest moves in the name among the funds that have filed, against each fund's previous 13F.

The well-known funds

Of the 44 funds followed here, 7 reported a position in Atrium Therapeutics, Inc. in a 13F for the quarter ended 30 June 2026. The largest: Geode Capital Management, 386,929 shares worth $5.2 million, 0.0% of its reported book. New this quarter: Renaissance Technologies. Sold out: Point72 Asset Management. In the quarter, 5 funds added or opened a position and 2 trimmed or sold out; together they bought a net 197,925 shares, about $2.7 million at the funds' own value per share on 30 June 2026. A change under 0.1% of a holding counts as held.

FundSharesValueOf its bookChange on the quarterStatusQuarter endedFiling
Geode Capital Management386,929$5.2 million0.0%+67,098added30 June 202613F
Two Sigma Investments345,481$4.6 million0.0%+166,921added30 June 202613F
Millennium Management200,559$2.7 million0.0%+9,700added30 June 202613F
Norges Bank126,575$1.7 million0.0%held30 June 202613F
Citadel Advisors67,639$909,7450.0%-42,297trimmed30 June 202613F
FMR LLC33,532$451,0050.0%+4,240added30 June 202613F
Renaissance Technologies14,971$201,3600.0%+14,971new30 June 202613F
Point72 Asset Management0$00.0%-22,708exited30 June 202613F
Value is what the fund reported.
Read moreChange is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.

The largest holders

FundSharesShare of allValueOf its bookChange in sharesFiling
Sessa Capital IM, L.P.1,500,0009.52%$20.2 million0.35%+948,60913F
Price T Rowe Associates Inc.1,472,9849.35%$19.8 million0.00%-80,22613F
BlackRock, Inc.1,447,4769.19%$19.5 million0.00%+242,18513F
Crcm LP1,283,0788.15%$17.3 million5.67%new13F
Arbiter Partners Capital Management LLC783,8644.98%$10.5 million1.92%13F
Vanguard Capital Management LLC730,8314.64%$9.8 million0.00%+103,96213F
TIG Advisors, LLC561,5333.56%$7.6 million0.35%-46,01913F
Cantor Fitzgerald, L. P.513,8343.26%$6.9 million0.07%13F
Geode Capital Management, LLC386,9292.46%$5.2 million0.00%+67,09813F
Two Sigma Investments, LP345,4812.19%$4.6 million0.00%+166,92113F
Goldman Sachs Group Inc.310,3411.97%$4.2 million0.00%-39,60913F
683 Capital Management, LLC300,0001.90%$4.0 million0.39%no change13F
State Street Corp.271,7621.73%$3.7 million0.00%+14,67613F
Slotnik Capital, LLC237,6371.51%$3.2 million0.89%+56,69213F
Weiss Asset Management LP219,7301.39%$3.0 million0.04%-20,97113F
Millennium Management LLC200,5591.27%$2.7 million0.00%+9,70013F
Schonfeld Strategic Advisors LLC199,1581.26%$2.7 million0.01%+36,39913F
AQR Capital Management LLC172,2351.09%$2.3 million0.00%new13F
Nexpoint Asset Management, L.P.150,0250.95%$2.0 million0.14%no change13F
Polar Asset Management Partners Inc.150,0000.95%$2.0 million0.05%+80,00013F
Squarepoint Ops LLC146,7430.93%$2.0 million0.00%-84,72313F
Bracebridge Capital, LLC139,2390.88%$1.9 million0.41%no change13F
Nomura Holdings Inc.137,3940.87%$1.8 million0.01%+1413F
Yakira Capital Management, Inc.133,0470.84%$1.8 million0.53%+6,40213F
Bank of America Corp.132,8330.84%$1.8 million0.00%-3,41513F
Charles Schwab Investment Management Inc.130,2170.83%$1.8 million0.00%+13,61913F
Tudor Investment Corp. Et Al129,5910.82%$1.7 million0.01%+58,23213F
Dafna Capital Management LLC128,0000.81%$1.7 million0.33%new13F
Creek Drive Management Group LLC127,6000.81%$1.7 million1.06%+7,60013F
Norges Bank126,5750.80%$1.7 million0.00%13F
Anson Funds Management LP125,0000.79%$1.7 million0.15%new13F
Northern Trust Corp.119,7810.76%$1.6 million0.00%+21,19613F
ExodusPoint Capital Management, LP117,2750.74%$1.6 million0.01%+39,83313F
Trium Capital LLP113,2780.72%$1.5 million0.96%new13F
TD Asset Management Inc111,2000.71%$1.5 million0.00%no change13F
Vanguard Fiduciary Trust Co.109,9610.70%$1.5 million0.00%+14,83313F
Jane Street Group, LLC109,8100.70%$1.5 million0.00%+89,85513F
Athos Capital Ltd107,9650.69%$1.5 million0.52%no change13F
AWM Investment Company, Inc.107,5000.68%$1.4 million0.12%+57,50013F
Balyasny Asset Management L.P.105,8750.67%$1.4 million0.00%-129,24013F
Marble Bar Asset Management LLP103,8490.66%$1.4 million0.97%-43,15113F
Vanguard Portfolio Management LLC101,1950.64%$1.4 million0.00%-243,17413F
Adage Capital Partners GP, L.l.c.100,0000.63%$1.3 million0.00%-83,58013F
BlueCrest Capital Management Ltd100,0000.63%$1.3 million0.06%new13F
Credit Industriel Et Commercial89,7230.57%$1.2 million0.14%+66,72313F
Groupe la Francaise80,2730.51%$1.1 million0.01%+50,57513F
FIL Ltd76,5000.49%$1.0 million0.00%-2,00013F
Caption Management, LLC75,2770.48%$1.0 million0.04%-28,31513F
Citadel Advisors LLC67,6390.43%$909,7450.00%-42,29713F
Manufacturers Life Insurance Company, the62,8530.40%$845,3730.00%+47413F
The 50 largest of the 154 funds that reported a position in RNA in their 13F for the quarter ended 30 June 2026, by the value each reported.
Read moreShare of all is the fund's part of all the shares the funds reported. Change is shares against the fund's 13F for the quarter before. A 13F lists a manager's long positions in US-listed shares at the quarter's end. What is a 13F?

Schedule 13D and 13G filed on the name, last twelve months

FiledScheduleWhoHoldingOf the classEvent dateRule or purposeFiling
14 August 202613G/ARA Capital Management, L.P. and 7 others00.0%30 June 2026passive, other (13d-1(d))EDGAR
14 August 202613GSessa Capital IM, L.P. and 3 others1.5 million8.8%30 June 2026passive, institutional (13d-1(b))EDGAR
14 August 202613G/AT. Rowe Price Associates, Inc. and 1 other1.5 million8.6%30 June 2026passive, institutional (13d-1(b))EDGAR
27 July 202613G/ABlackRock, Inc. and 1 other1.1 million6.6%30 June 2026passive, institutional (13d-1(b))EDGAR
15 May 202613GRA Capital Management, L.P. and 7 others864,1025.6%31 March 2026passive, other (13d-1(d))EDGAR
27 April 202613GBlackRock, Inc. and 1 other892,3875.2%31 March 2026passive, institutional (13d-1(b))EDGAR
8 April 202613GT. Rowe Price Associates, Inc. and 1 other1.6 million10.0%31 March 2026passive, institutional (13d-1(b))EDGAR
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
Read moreAmendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short. 13D and 13G

Fails to deliver

Settlement dateShares failedPriceFile
21 August 20263,946$13.48SEC
17 August 2026183$12.84SEC
7 August 2026488$12.11SEC
30 July 2026304$11.18SEC
27 July 20265,055$11.49SEC
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.
Read moreLargest in the window: 5,055 on 27 July 2026. A fail is an operational fact about settlement, not a position.