Organon & Co.: which funds bought and sold

Institutions that bought and sold Organon & shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 226 institutions that filed 13F reports for both quarters added to or opened positions in Organon &, and 278 cut or closed them. Together they added a net 15.4M shares, +7.7% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 12.2M shares (+29.2%); index fund managers were net sellers of 6.1M shares (−7.0%). 108 opened a new position and 91 sold out entirely.

Bought, Q2 2026 226 institutions, 108 of them new holders Sold, Q2 2026 278 institutions, 91 of them sold out

Net change, all compared +15.4M shares (+7.7%)

Net change, active managers +12.2M shares (+29.2%), 22 bought, 35 sold

Buyers versus sellers

institutions compared, 692

226 bought 188 278 sold

Active managers and hedge funds 22 bought · 35 sold · +12.2M

Index fund managers 9 bought · 3 sold · −6.1M

Other institutions 195 bought · 240 sold · +9.3M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Pentwater Capital Management LP Hedge fund	+18.1M New position	18.1M	$245M
Man Group PLC Hedge fund	+4.2M New position	4.2M	$56.6M
Alliancebernstein L.P. Active manager	+4.0M +559.9%	4.8M	$28.5M
AQR Arbitrage LLC	+3.9M New position	3.9M	$52.4M
Goldman Sachs Group Inc	+3.6M +223.9%	5.2M	$70.4M
Nexpoint Asset Management, L.P.	+3.0M New position	3.0M	$40.8M
Magnetar Financial LLC Hedge fund	+2.8M New position	2.8M	$38M
Glazer Capital, LLC	+2.7M New position	2.7M	$37.2M
Kryger Capital LLC	+2.2M New position	2.2M	$29.1M
Balyasny Asset Management L.P. Hedge fund	+2.0M +908.1%	2.2M	$29.7M
Westchester Capital Management, LLC Hedge fund	+1.4M New position	1.4M	$19.3M
Tig Advisors, LLC	+1.4M New position	1.4M	$19M
UBS Group AG	+1.4M +39.9%	4.9M	$65.8M
Water Island Capital LLC	+1.4M New position	1.4M	$18.6M
Alpine Associates Management Inc.	+1.3M New position	1.3M	$18.2M
HSBC Holdings PLC	+1.1M +4706.9%	1.1M	$14.6M
Allianz Asset Management Gmbh	+1.0M +93.3%	2.1M	$28.3M
Gabelli Funds LLC Active manager	+955K New position	955K	$12.9M
Polar Asset Management Partners Inc.	+950K New position	950K	$12.9M
Healthcare Of Ontario Pension Plan Trust Fund	+837K New position	837K	$11.3M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Pentwater Capital Management LP Hedge fund	+18.1M New position	18.1M	$245M
Man Group PLC Hedge fund	+4.2M New position	4.2M	$56.6M
Alliancebernstein L.P. Active manager	+4.0M +559.9%	4.8M	$28.5M
Magnetar Financial LLC Hedge fund	+2.8M New position	2.8M	$38M
Balyasny Asset Management L.P. Hedge fund	+2.0M +908.1%	2.2M	$29.7M
Westchester Capital Management, LLC Hedge fund	+1.4M New position	1.4M	$19.3M
Gabelli Funds LLC Active manager	+955K New position	955K	$12.9M
Centiva Capital, LP Hedge fund	+555K New position	555K	$7.5M
Winton Group Ltd Hedge fund	+510K New position	510K	$6.9M
Verition Fund Management LLC Hedge fund	+498K New position	498K	$6.7M

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Vanguard Portfolio Management LLC Index funds	−6.7M −30.7%	15.1M	$205M
Canada Pension Plan Investment Board	−5.0M Sold out	0	—
Think Investments LP	−4.0M Sold out	0	—
LSV Asset Management Active manager	−3.5M −48.5%	3.7M	$50.6M
Millennium Management LLC Hedge fund	−3.3M −49.2%	3.4M	$46.6M
Two Sigma Investments, LP Hedge fund	−2.9M −92.3%	241K	$3.3M
Kahn Brothers Group Inc	−2.9M −51.8%	2.7M	$36.2M
AQR Capital Management LLC Hedge fund	−2.2M −63.9%	1.2M	$16.8M
D. E. Shaw & Co., Inc. Hedge fund	−1.9M −72.8%	719K	$9.7M
Massachusetts Financial Services Co Active manager	−1.7M Sold out	0	—
Citadel Advisors LLC Hedge fund	−1.7M −82.8%	344K	$4.7M
FMR LLC Active manager	−1.4M −53.6%	1.2M	$16.1M
Cerity Partners LLC	−1.3M −56.3%	1.0M	$13.7M
Morgan Stanley	−1.1M −33.1%	2.2M	$29.8M
Mitsubishi Ufj Trust & Banking Corp	−964K −88.7%	123K	$1.7M
Sio Capital Management, LLC	−866K Sold out	0	—
Susquehanna International Group, LLP	−861K −79.5%	222K	$3M
M&G PLC	−819K −81.7%	184K	$2.6M
Hotchkis & Wiley Capital Management LLC Active manager	−633K −46.0%	743K	$10.1M
Private Management Group Inc	−632K −14.4%	3.7M	$50.7M

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
LSV Asset Management Active manager	−3.5M −48.5%	3.7M	$50.6M
Millennium Management LLC Hedge fund	−3.3M −49.2%	3.4M	$46.6M
Two Sigma Investments, LP Hedge fund	−2.9M −92.3%	241K	$3.3M
AQR Capital Management LLC Hedge fund	−2.2M −63.9%	1.2M	$16.8M
D. E. Shaw & Co., Inc. Hedge fund	−1.9M −72.8%	719K	$9.7M
Massachusetts Financial Services Co Active manager	−1.7M Sold out	0	—
Citadel Advisors LLC Hedge fund	−1.7M −82.8%	344K	$4.7M
FMR LLC Active manager	−1.4M −53.6%	1.2M	$16.1M
Hotchkis & Wiley Capital Management LLC Active manager	−633K −46.0%	743K	$10.1M
Bridgewater Associates, LP Hedge fund	−594K Sold out	0	—

New positions

largest by value

Institution	Shares	Value June 30, 2026
Pentwater Capital Management LPHedge fund	18.1M	$245M
Man Group PLCHedge fund	4.2M	$56.6M
AQR Arbitrage LLC	3.9M	$52.4M
Nexpoint Asset Management, L.P.	3.0M	$40.8M
Magnetar Financial LLCHedge fund	2.8M	$38M
Glazer Capital, LLC	2.7M	$37.2M
Kryger Capital LLC	2.2M	$29.1M
Westchester Capital Management, LLCHedge fund	1.4M	$19.3M
Tig Advisors, LLC	1.4M	$19M
Water Island Capital LLC	1.4M	$18.6M

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Canada Pension Plan Investment Board	5.0M	$30M
Think Investments LP	4.0M	$24M
Massachusetts Financial Services CoActive manager	1.7M	$10.1M
Sio Capital Management, LLC	866K	$5.2M
Bridgewater Associates, LPHedge fund	594K	$3.6M
Y-Intercept (Hong Kong) Ltd	476K	$2.9M
Grantham, Mayo, Van Otterloo & Co. LLCActive manager	449K	$2.7M
Trexquant Investment LPHedge fund	403K	$2.4M
Walleye Capital LLCHedge fund	393K	$2.4M
Lombard Odier Asset Management (USA) Corp	380K	$2.3M

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 618
Ten largest holders: 50.6%
Index fund managers: 37.2%
Active managers and hedge funds: 26.1%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	22	35	14	16	+12.2M	+29.2%
Index fund managers	9	3	1	0	−6.1M	−7.0%
Other institutions	195	240	93	75	+9.3M	+13.2%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Organon &.

Only managers that filed a holdings report for both quarters are compared (692 here). 29 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

← Back to Organon & Co. · Insiders · Politicians