OGN Institutional Ownership & Shareholders
ORGANON & CO (OGN) is currently held by 587 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $2.90B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
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 $443.67M, representing an estimated gain of +2.22% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 51% 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
587
Total Reported Value
$2.90B
Largest Holder
Blackrock, Inc.
Largest Position
$434.05M
Insider Transactions (90d)
3
Latest Filing Quarter
Q2 2026
New Institutional Positions
48
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 | $443,667,025 | +$9,617,064 | +2.22% | |
| Pentwater Capital Management Lp | 1.96% | 18,100,000 | $245,074,000 | $250,504,000 | +$5,430,000 | +2.22% | |
| Vanguard Portfolio Management Llc | 0.01% | 15,132,118 | $204,888,878 | $209,428,513 | +$4,539,635 | +2.22% | |
| Vanguard Capital Management Llc | 0.00% | 11,909,865 | $161,259,572 | $164,832,532 | +$3,572,960 | +2.22% | |
| State Street Corp | 0.00% | 9,659,371 | $130,787,883 | $133,685,695 | +$2,897,812 | +2.22% | |
| Goldman Sachs Group Inc | 0.01% | 5,199,002 | $70,394,490 | $71,954,188 | +$1,559,698 | +2.22% | |
| Ubs Group Ag | 0.01% | 4,856,529 | $65,757,403 | $67,214,361 | +$1,456,958 | +2.22% | |
| Geode Capital Management, Llc | 0.00% | 4,815,610 | $65,219,903 | $66,648,042 | +$1,428,139 | +2.19% | |
| Man Group Plc | 0.10% | 4,180,500 | $56,603,970 | $57,858,120 | +$1,254,150 | +2.22% | |
| Aqr Arbitrage Llc | 0.75% | 3,880,354 | $52,384,779 | $53,704,099 | +$1,319,320 | +2.52% | |
| Private Management Group Inc | 1.33% | 3,742,161 | $50,668,860 | $51,791,508 | +$1,122,648 | +2.22% | |
| Lsv Asset Management | 0.09% | 3,737,036 | $50,599,000 | $51,720,578 | +$1,121,578 | +2.22% | |
| Charles Schwab Investment Management Inc | 0.01% | 3,457,262 | $46,811,327 | $47,848,506 | +$1,037,179 | +2.22% | |
| Millennium Management Llc | 0.03% | 3,442,430 | $46,610,502 | $47,643,231 | +$1,032,729 | +2.22% | |
| Dimensional Fund Advisors Lp | 0.01% | 3,266,826 | $44,233,037 | $45,212,872 | +$979,835 | +2.22% | |
| First Trust Advisors Lp | 0.02% | 3,099,481 | $41,966,777 | $42,896,817 | +$930,040 | +2.22% | |
| Capula Management Ltd | 0.19% | 3,049,207 | $41,286,263 | $42,201,025 | +$914,762 | +2.22% | |
| Nexpoint Asset Management, L.P. | 2.72% | 3,009,630 | $40,750,390 | $41,653,279 | +$902,889 | +2.22% | |
| Magnetar Financial Llc | 0.35% | 2,810,019 | $38,047,658 | $38,890,663 | +$843,005 | +2.22% | |
| Glazer Capital, Llc | 0.92% | 2,745,000 | $37,167,000 | $37,990,800 | +$823,800 | +2.22% | |
| Kahn Brothers Group | Thomas Graham, Alan, Irving Kahns | 5.72% | 2,670,523 | $36,158,881 | $36,960,038 | +$801,157 | +2.22% |
| Bank Of New York Mellon Corp | 0.01% | 2,282,161 | $30,900,464 | $31,585,108 | +$684,644 | +2.22% | |
| Morgan Stanley | 0.00% | 2,202,199 | $29,817,803 | $30,478,434 | +$660,631 | +2.22% | |
| Balyasny Asset Management L.P. | 0.05% | 2,196,642 | $29,742,533 | $30,401,525 | +$658,992 | +2.22% | |
| Kryger Capital Llc | 1.66% | 2,152,693 | $29,147,463 | $29,793,271 | +$645,808 | +2.22% | |
| Alliancebernstein L.P. | 0.01% | 4,754,671 | $28,480,479 | $65,804,647 | +$37,324,168 | +131.05% | |
| Allianz Asset Management Gmbh | 0.03% | 2,093,459 | $28,345,435 | $28,973,473 | +$628,038 | +2.22% | |
| Northern Trust Corp | 0.00% | 2,080,508 | $28,170,079 | $28,794,231 | +$624,152 | +2.22% | |
| Vanguard Fiduciary Trust Co | 0.00% | 1,660,492 | $22,483,062 | $22,981,209 | +$498,147 | +2.22% | |
| Invesco Ltd. | 0.00% | 1,643,187 | $22,248,752 | $22,741,708 | +$492,956 | +2.22% | |
| Westchester Capital Management, Llc | 0.97% | 1,426,578 | $19,315,866 | $19,743,840 | +$427,974 | +2.22% | |
| Tig Advisors, Llc | 0.87% | 1,400,283 | $18,959,832 | $19,379,917 | +$420,085 | +2.22% | |
| Water Island Capital Llc | 1.97% | 1,374,899 | $18,616,133 | $19,028,602 | +$412,469 | +2.22% | |
| Alpine Associates Management Inc. | 1.14% | 1,345,233 | $18,214,455 | $18,618,025 | +$403,570 | +2.22% | |
| Principal Financial Group Inc | 0.01% | 1,245,982 | $17,069,953 | $17,244,391 | +$174,438 | +1.02% | |
| Aqr Capital Management Llc | 0.01% | 1,245,588 | $16,815,436 | $17,238,938 | +$423,502 | +2.52% | |
| Fmr Llc | 0.00% | 1,187,549 | $16,079,421 | $16,435,678 | +$356,257 | +2.22% | |
| Hsbc Holdings Plc | 0.01% | 1,078,134 | $14,571,361 | $14,921,375 | +$350,014 | +2.40% | |
| Gotham Asset Management, Llc | 0.03% | 1,032,313 | $13,977,518 | $14,287,212 | +$309,694 | +2.22% | |
| Cerity Partners Llc | 0.02% | 1,009,842 | $13,673,253 | $13,976,213 | +$302,960 | +2.22% | |
| Gabelli Funds Llc | 0.08% | 954,910 | $12,929,481 | $13,215,954 | +$286,473 | +2.22% | |
| Polar Asset Management Partners Inc. | 0.24% | 949,806 | $12,860,373 | $13,145,315 | +$284,942 | +2.22% | |
| Gfs Advisors, Llc | 1.30% | 1,267 | $12,304,334 | $17,535 | -$12,286,799 | -99.86% | |
| Public Sector Pension Investment Board | 0.03% | 902,195 | $12,215,720 | $12,486,379 | +$270,659 | +2.22% | |
| Healthcare Of Ontario Pension Plan Trust Fund | 0.02% | 837,305 | $11,337,110 | $11,588,301 | +$251,191 | +2.22% | |
| Marshall Wace, Llp | 0.01% | 828,133 | $11,212,922 | $11,461,361 | +$248,439 | +2.22% | |
| Groupe La Francaise | 0.13% | 775,382 | $10,498,672 | $10,731,287 | +$232,615 | +2.22% | |
| Hotchkis & Wiley Capital Management Llc | 0.03% | 743,270 | $10,063,876 | $10,286,857 | +$222,981 | +2.22% | |
| Brandes Investment Partners, Lp | 0.07% | 729,502 | $9,877,457 | $10,096,308 | +$218,851 | +2.22% | |
| D. E. Shaw & Co., Inc. | 0.01% | 718,753 | $9,731,916 | $9,947,542 | +$215,626 | +2.22% |
Frequently asked questions about OGN
Who are the largest institutional holders of OGN?
The largest institutional holders of OGN reported in the latest SEC Form 13F filings include Blackrock, Inc., Pentwater Capital Management Lp, Vanguard Portfolio Management Llc, Vanguard Capital Management Llc, and State Street Corp. InsiderSet ranks institutional holders by their latest reported OGN position.
What is OGN institutional ownership?
This page tracks OGN positions reported by institutional investment managers through SEC Form 13F. ORGANON & CO (OGN) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own OGN?
InsiderSet currently tracks 587 institutional managers reporting OGN holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of OGN shareholders.
How much OGN stock do institutions own?
Institutional investment managers disclosed approximately $2.90B in OGN holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was OGN institutional ownership last updated?
The latest OGN institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional OGN holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its OGN position after the reporting date.
Are institutions buying or selling OGN?
Institutional buying and selling can be analyzed by comparing OGN positions across consecutive 13F reporting periods. InsiderSet's OGN Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View OGN ownership changes.
How has OGN institutional ownership changed over time?
InsiderSet tracks OGN institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.