ORGANON & CO (OGN) Top 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 March 31, 2026. The institutional investors covered on this page collectively reported approximately $1.20B 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 $189.98M in its March 31, 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 $428.81M, representing an estimated gain of +125.71% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 54% of the total disclosed OGN value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management Llc, Vanguard Capital 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
588
Total Reported Value
$1.20B
Largest Holder
Blackrock, Inc.
Largest Position
$189.98M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
60
Funds Exiting Positions
1
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 31,717,028 | $189,984,998 | $428,814,219 | +$238,829,221 | +125.71% | |
| Vanguard Portfolio Management Llc | 0.01% | 21,846,036 | $130,857,756 | $295,358,407 | +$164,500,651 | +125.71% | |
| Vanguard Capital Management Llc | 0.00% | 11,737,018 | $70,304,738 | $158,684,483 | +$88,379,745 | +125.71% | |
| State Street Corp | 0.00% | 9,956,774 | $59,641,076 | $134,615,584 | +$74,974,508 | +125.71% | |
| Eversource Wealth Advisors, Llc | 1.28% | 126,291 | $41,756,324 | $1,707,454 | -$40,048,870 | -95.91% | |
| Millennium Management Llc | 0.03% | 6,781,535 | $40,621,395 | $91,686,353 | +$51,064,958 | +125.71% | |
| Kahn Brothers Group | Thomas Graham, Alan, Irving Kahns | 5.88% | 5,536,993 | $33,166,588 | $74,860,145 | +$41,693,557 | +125.71% |
| Canada Pension Plan Investment Board | 0.02% | 5,011,100 | $30,016,489 | $67,750,072 | +$37,733,583 | +125.71% | |
| Geode Capital Management, Llc | 0.00% | 4,759,337 | $28,515,397 | $64,346,236 | +$35,830,839 | +125.65% | |
| Storebrand Asset Management As | 0.01% | 968,903 | $26,530,320 | $13,099,569 | -$13,430,751 | -50.62% | |
| Private Management Group Inc | 0.75% | 4,374,108 | $26,200,907 | $59,137,940 | +$32,937,033 | +125.71% | |
| Think Investments Lp | 3.23% | 4,000,000 | $23,960,000 | $54,080,000 | +$30,120,000 | +125.71% | |
| Ubs Group Ag | 0.00% | 3,471,579 | $20,794,758 | $46,935,748 | +$26,140,990 | +125.71% | |
| Aqr Capital Management Llc | 0.01% | 3,450,626 | $20,186,160 | $46,652,464 | +$26,466,304 | +131.11% | |
| Charles Schwab Investment Management Inc | 0.00% | 3,362,349 | $20,140,471 | $45,458,958 | +$25,318,487 | +125.71% | |
| Morgan Stanley | 0.00% | 3,292,684 | $19,723,184 | $44,517,088 | +$24,793,904 | +125.71% | |
| Dimensional Fund Advisors Lp | 0.00% | 3,265,280 | $19,552,634 | $44,146,586 | +$24,593,952 | +125.78% | |
| First Trust Advisors Lp | 0.01% | 3,227,320 | $19,331,599 | $43,633,366 | +$24,301,767 | +125.71% | |
| Two Sigma Investments, Lp | 0.02% | 3,137,020 | $18,790,750 | $42,412,510 | +$23,621,760 | +125.71% | |
| D. E. Shaw & Co., Inc. | 0.01% | 2,644,552 | $15,840,867 | $35,754,343 | +$19,913,476 | +125.71% | |
| Fmr Llc | 0.00% | 2,558,692 | $15,326,564 | $34,593,516 | +$19,266,952 | +125.71% | |
| Cerity Partners Llc | 0.02% | 2,309,039 | $13,831,138 | $31,218,207 | +$17,387,069 | +125.71% | |
| Bank Of New York Mellon Corp | 0.00% | 2,231,761 | $13,368,252 | $30,173,409 | +$16,805,157 | +125.71% | |
| Invesco Ltd. | 0.00% | 2,226,714 | $13,338,017 | $30,105,173 | +$16,767,156 | +125.71% | |
| Citadel Advisors Llc | 0.01% | 1,998,390 | $11,970,356 | $27,018,233 | +$15,047,877 | +125.71% | |
| Northern Trust Corp | 0.00% | 1,914,114 | $11,465,542 | $25,878,821 | +$14,413,279 | +125.71% | |
| Massachusetts Financial Services Co | 0.00% | 1,689,210 | $10,118,368 | $22,838,119 | +$12,719,751 | +125.71% | |
| Vanguard Fiduciary Trust Co | 0.00% | 1,612,057 | $9,656,221 | $21,795,011 | +$12,138,790 | +125.71% | |
| Goldman Sachs Group Inc | 0.00% | 1,605,325 | $9,615,894 | $21,703,994 | +$12,088,100 | +125.71% | |
| Hotchkis & Wiley Capital Management Llc | 0.03% | 1,375,960 | $8,242,000 | $18,602,979 | +$10,360,979 | +125.71% | |
| Principal Financial Group Inc | 0.00% | 1,260,689 | $7,551,527 | $17,044,515 | +$9,492,988 | +125.71% | |
| Gotham Asset Management, Llc | 0.02% | 1,257,055 | $7,529,759 | $16,995,384 | +$9,465,625 | +125.71% | |
| Mitsubishi Ufj Trust & Banking Corp | 0.02% | 1,086,369 | $6,507,351 | $14,687,709 | +$8,180,358 | +125.71% | |
| Susquehanna International Group, Llp | 0.01% | 1,082,760 | $6,485,732 | $14,638,915 | +$8,153,183 | +125.71% | |
| Allianz Asset Management Gmbh | 0.01% | 1,082,748 | $6,485,661 | $14,638,753 | +$8,153,092 | +125.71% | |
| M&G Plc | 0.03% | 1,003,250 | $6,019,500 | $13,563,940 | +$7,544,440 | +125.33% | |
| First Manhattan Co. Llc. | 0.02% | 950,172 | $5,691,530 | $12,846,325 | +$7,154,795 | +125.71% | |
| Marshall Wace, Llp | 0.01% | 933,176 | $5,589,725 | $12,616,540 | +$7,026,815 | +125.71% | |
| Public Sector Pension Investment Board | 0.02% | 930,094 | $5,571,263 | $12,574,871 | +$7,003,608 | +125.71% | |
| Sio Capital Management, Llc | 0.75% | 865,908 | $5,186,789 | $11,707,076 | +$6,520,287 | +125.71% | |
| Alliancebernstein L.P. | 0.00% | 720,512 | $5,166,071 | $9,741,322 | +$4,575,251 | +88.56% | |
| Squarepoint Ops Llc | 0.01% | 831,424 | $4,980,230 | $11,240,852 | +$6,260,622 | +125.71% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 778,905 | $4,665,640 | $10,530,796 | +$5,865,156 | +125.71% | |
| Ameriprise Financial Inc | 0.00% | 754,240 | $4,517,901 | $10,197,325 | +$5,679,424 | +125.71% | |
| Bank Of America Corp | 0.00% | 738,502 | $4,423,629 | $9,984,547 | +$5,560,918 | +125.71% | |
| Wells Fargo & Company/Mn | 0.00% | 700,599 | $4,196,586 | $9,472,098 | +$5,275,512 | +125.71% | |
| Brandes Investment Partners, Lp | 0.03% | 691,625 | $4,142,834 | $9,350,770 | +$5,207,936 | +125.71% | |
| Legal & General Group Plc | 0.00% | 678,043 | $4,061,454 | $9,167,141 | +$5,105,687 | +125.71% | |
| Citigroup Inc | 0.00% | 596,772 | $3,574,664 | $8,068,357 | +$4,493,693 | +125.71% | |
| Bridgewater Associates, Lp | 0.02% | 594,483 | $3,560,953 | $8,037,410 | +$4,476,457 | +125.71% |
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.