ORGANON & CO (OGN) Institutional Shareholders
ORGANON & CO (OGN) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $2.83B in OGN holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of OGN tracked by InsiderSet, reporting ownership valued at approximately $434.05M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $440.78M, representing an estimated gain of +1.55% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 53% of the total disclosed OGN value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Pentwater Capital Management Lp, Vanguard Portfolio Management Llc, and several other long-term asset managers with concentrated positions in ORGANON & CO (OGN).
This page ranks the largest institutional OGN shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
607
Total Reported Value
$2.83B
Largest Holder
Blackrock, Inc.
Largest Position
$434.05M
Insider Transactions (90d)
3
Latest Filing Quarter
Q2 2026
New Institutional Positions
68
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 32,056,866 | $434,049,961 | $440,781,908 | +$6,731,947 | +1.55% | |
| Pentwater Capital Management Lp | 1.96% | 18,100,000 | $245,074,000 | $248,875,000 | +$3,801,000 | +1.55% | |
| Vanguard Portfolio Management Llc | 0.01% | 15,132,118 | $204,888,878 | $208,066,623 | +$3,177,745 | +1.55% | |
| Vanguard Capital Management Llc | 0.00% | 11,909,865 | $161,259,572 | $163,760,644 | +$2,501,072 | +1.55% | |
| State Street Corp | 0.00% | 9,659,371 | $130,787,883 | $132,816,351 | +$2,028,468 | +1.55% | |
| Goldman Sachs Group Inc | 0.01% | 5,199,002 | $70,394,490 | $71,486,278 | +$1,091,788 | +1.55% | |
| Ubs Group Ag | 0.01% | 4,856,529 | $65,757,403 | $66,777,274 | +$1,019,871 | +1.55% | |
| Geode Capital Management, Llc | 0.00% | 4,815,610 | $65,219,903 | $66,214,638 | +$994,735 | +1.53% | |
| Man Group Plc | 0.10% | 4,180,500 | $56,603,970 | $57,481,875 | +$877,905 | +1.55% | |
| Aqr Arbitrage Llc | 0.75% | 3,880,354 | $52,384,779 | $53,354,868 | +$970,089 | +1.85% | |
| Private Management Group Inc | 1.33% | 3,742,161 | $50,668,860 | $51,454,714 | +$785,854 | +1.55% | |
| Charles Schwab Investment Management Inc | 0.01% | 3,457,262 | $46,811,327 | $47,537,353 | +$726,026 | +1.55% | |
| Sixth Street Partners Management Company, L.P. | 0.01% | 3,457,262 | $46,811,327 | $47,537,353 | +$726,026 | +1.55% | |
| Millennium Management Llc | 0.03% | 3,442,430 | $46,610,502 | $47,333,413 | +$722,911 | +1.55% | |
| Dimensional Fund Advisors Lp | 0.01% | 3,266,826 | $44,233,037 | $44,918,858 | +$685,821 | +1.55% | |
| First Trust Advisors Lp | 0.02% | 3,099,481 | $41,966,777 | $42,617,864 | +$651,087 | +1.55% | |
| Capula Management Ltd | 0.19% | 3,049,207 | $41,286,263 | $41,926,596 | +$640,333 | +1.55% | |
| Nexpoint Asset Management, L.P. | 2.72% | 3,009,630 | $40,750,390 | $41,382,413 | +$632,023 | +1.55% | |
| Magnetar Financial Llc | 0.35% | 2,810,019 | $38,047,658 | $38,637,761 | +$590,103 | +1.55% | |
| Kahn Brothers Group | Thomas Graham, Alan, Irving Kahns | 5.88% | 5,536,993 | $33,166,588 | $76,133,654 | +$42,967,066 | +129.55% |
| Bank Of New York Mellon Corp | 0.01% | 2,282,161 | $30,900,464 | $31,379,714 | +$479,250 | +1.55% | |
| Morgan Stanley | 0.00% | 2,202,199 | $29,817,803 | $30,280,236 | +$462,433 | +1.55% | |
| Balyasny Asset Management L.P. | 0.05% | 2,196,642 | $29,742,533 | $30,203,828 | +$461,295 | +1.55% | |
| Kryger Capital Llc | 1.66% | 2,152,693 | $29,147,463 | $29,599,529 | +$452,066 | +1.55% | |
| Alliancebernstein L.P. | 0.01% | 4,754,671 | $28,480,479 | $65,376,726 | +$36,896,247 | +129.55% | |
| Allianz Asset Management Gmbh | 0.03% | 2,093,459 | $28,345,435 | $28,785,061 | +$439,626 | +1.55% | |
| Northern Trust Corp | 0.00% | 2,080,508 | $28,170,079 | $28,606,985 | +$436,906 | +1.55% | |
| Vanguard Fiduciary Trust Co | 0.00% | 1,660,492 | $22,483,062 | $22,831,765 | +$348,703 | +1.55% | |
| Invesco Ltd. | 0.00% | 1,643,187 | $22,248,752 | $22,593,821 | +$345,069 | +1.55% | |
| Westchester Capital Management, Llc | 0.97% | 1,426,578 | $19,315,866 | $19,615,448 | +$299,582 | +1.55% | |
| Tig Advisors, Llc | 0.87% | 1,400,283 | $18,959,832 | $19,253,891 | +$294,059 | +1.55% | |
| Water Island Capital Llc | 1.97% | 1,374,899 | $18,616,133 | $18,904,861 | +$288,728 | +1.55% | |
| Alpine Associates Management Inc. | 1.14% | 1,345,233 | $18,214,455 | $18,496,954 | +$282,499 | +1.55% | |
| Principal Financial Group Inc | 0.01% | 1,266,614 | $17,149,953 | $17,415,943 | +$265,990 | +1.55% | |
| Aqr Capital Management Llc | 0.01% | 1,245,588 | $16,815,436 | $17,126,835 | +$311,399 | +1.85% | |
| Fmr Llc | 0.00% | 1,187,549 | $16,079,421 | $16,328,799 | +$249,378 | +1.55% | |
| Hsbc Holdings Plc | 0.01% | 1,078,134 | $14,571,361 | $14,824,343 | +$252,982 | +1.74% | |
| Gotham Asset Management, Llc | 0.03% | 1,032,313 | $13,977,518 | $14,194,304 | +$216,786 | +1.55% | |
| Cerity Partners Llc | 0.02% | 1,009,842 | $13,673,253 | $13,885,328 | +$212,075 | +1.55% | |
| Gabelli Funds Llc | 0.08% | 954,910 | $12,929,481 | $13,130,013 | +$200,532 | +1.55% | |
| Polar Asset Management Partners Inc. | 0.24% | 949,806 | $12,860,373 | $13,059,833 | +$199,460 | +1.55% | |
| Public Sector Pension Investment Board | 0.03% | 902,195 | $12,215,720 | $12,405,181 | +$189,461 | +1.55% | |
| Healthcare Of Ontario Pension Plan Trust Fund | 0.02% | 837,305 | $11,337,110 | $11,512,944 | +$175,834 | +1.55% | |
| Marshall Wace, Llp | 0.01% | 828,133 | $11,212,922 | $11,386,829 | +$173,907 | +1.55% | |
| Groupe La Francaise | 0.13% | 775,382 | $10,498,672 | $10,661,503 | +$162,831 | +1.55% | |
| Hotchkis & Wiley Capital Management Llc | 0.03% | 743,270 | $10,063,876 | $10,219,963 | +$156,087 | +1.55% | |
| Brandes Investment Partners, Lp | 0.07% | 729,502 | $9,877,457 | $10,030,653 | +$153,196 | +1.55% | |
| D. E. Shaw & Co., Inc. | 0.01% | 718,753 | $9,731,916 | $9,882,854 | +$150,938 | +1.55% | |
| Tokio Marine Asset Management Co Ltd | 0.30% | 704,100 | $9,533,514 | $9,681,375 | +$147,861 | +1.55% | |
| Sagefield Capital Lp | 0.70% | 701,857 | $9,503,144 | $9,650,534 | +$147,390 | +1.55% |
Frequently asked questions about OGN
Who owns the most OGN stock?
The largest holders of OGN are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for ORGANON & CO (OGN).
Is OGN widely held by superinvestors?
Many widely followed stocks like OGN appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly OGN is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.