Who owns OLN (OLN)
Which tracked institutional funds hold OLN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See OLN company fundamentals →
Ownership as of the 2026-Q1 13F filings. 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on OLN is one-sided between 2025-Q4 and 2026-Q1: 169 added or opened and 50 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
OLN’s largest tracked holder by dollar value, HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC, sizes it at 1.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 1.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in OLN divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 416 tracked filers holding OLN, 258 increased or opened the position and 155 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in OLN between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 45
- VANGUARD PORTFOLIO MANAGEMENT LLC$162M
- VANGUARD CAPITAL MANAGEMENT LLC$150M
- TWO SIGMA INVESTMENTS, LP$36M
- NORGES BANK$35M
- VANGUARD FIDUCIARY TRUST CO$21M
- BRIDGEWAY CAPITAL MANAGEMENT, LLC$20M
Full exits 33
- VANGUARD GROUP INC$218M
- Orbis Allan Gray Ltd$79M
- VOLORIDGE INVESTMENT MANAGEMENT, LLC$17M
- MASTERS CAPITAL MANAGEMENT LLC$15M
- Jain Global LLC$14M
- Invenomic Capital Management LP$8M
Largest adds
- HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC$130M
- GOLDMAN SACHS GROUP INC$75M
- DIMENSIONAL FUND ADVISORS LP$72M
- STATE STREET CORP$44M
- YACKTMAN ASSET MANAGEMENT LP$40M
- PZENA INVESTMENT MANAGEMENT LLC$38M
Largest trims
- BlackRock, Inc.$64M
- Point72 Asset Management, L.P.$22M
- Thomist Capital Management, LP$7M
- CenterBook Partners LP$5M
- CANADA PENSION PLAN INVESTMENT BOARD$3M
- Verition Fund Management LLC$3M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC trimmed | 15,084,224 | $448M | 13.1% | 2026-Q1 |
| BlackRock, Inc. trimmed | 6,219,102 | $185M | 5.4% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 5,627,997 | $167M | 4.9% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 5,439,407 | $162M | 4.7% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 5,038,968 | $150M | 4.4% | 2026-Q1 |
| FULLER & THALER ASSET MANAGEMENT, INC. trimmed | 5,015,877 | $149M | 4.4% | 2026-Q1 |
| STATE STREET CORP added | 4,800,018 | $143M | 4.2% | 2026-Q1 |
| PZENA INVESTMENT MANAGEMENT LLC trimmed | 4,431,613 | $132M | 3.8% | 2026-Q1 |
| YACKTMAN ASSET MANAGEMENT LP added | 4,092,211 | $122M | 3.6% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 2,836,183 | $84M | 2.5% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,111,576 | $63M | 1.8% | 2026-Q1 |
| SEMPER AUGUSTUS INVESTMENTS GROUP LLC added | 2,029,319 | $60M | 1.8% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 1,774,009 | $53M | 1.5% | 2026-Q1 |
| MORGAN STANLEY trimmed | 1,651,667 | $49M | 1.4% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 1,640,514 | $49M | 1.4% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 1,557,182 | $46M | 1.4% | 2026-Q1 |
| Bank of New York Mellon Corp added | 1,232,912 | $37M | 1.1% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 1,195,624 | $36M | 1.0% | 2026-Q1 |
| NORGES BANK added | 1,437,295 | $35M | 1.0% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 1,164,086 | $35M | 1.0% | 2026-Q1 |
| UBS Group AG added | 1,122,054 | $33M | 1.0% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 1,065,487 | $32M | 0.9% | 2026-Q1 |
| NORTHERN TRUST CORP added | 989,256 | $29M | 0.9% | 2026-Q1 |
| Gotham Asset Management, LLC added | 791,070 | $24M | 0.7% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 782,157 | $23M | 0.7% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 721,822 | $21M | 0.6% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 713,041 | $21M | 0.6% | 2026-Q1 |
| FMR LLC trimmed | 707,215 | $21M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 706,029 | $21M | 0.6% | 2026-Q1 |
| Amundi added | 684,036 | $20M | 0.6% | 2026-Q1 |
| Invesco Ltd. trimmed | 676,073 | $20M | 0.6% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 664,843 | $20M | 0.6% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL added | 660,524 | $20M | 0.6% | 2026-Q1 |
| Wolf Hill Capital Management, LP new | 633,516 | $19M | 0.5% | 2026-Q1 |
| MetLife Investment Management, LLC added | 627,557 | $19M | 0.5% | 2026-Q1 |
| Merewether Investment Management, LP added | 623,377 | $19M | 0.5% | 2026-Q1 |
| Nuveen, LLC added | 576,883 | $17M | 0.5% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 573,992 | $17M | 0.5% | 2026-Q1 |
| PDT Partners, LLC added | 507,411 | $15M | 0.4% | 2026-Q1 |
| SEGALL BRYANT & HAMILL, LLC added | 496,791 | $15M | 0.4% | 2026-Q1 |
| KLCM Advisors, Inc. added | 473,056 | $14M | 0.4% | 2026-Q1 |
| Allianz Asset Management GmbH added | 470,865 | $14M | 0.4% | 2026-Q1 |
| Retirement Systems of Alabama added | 452,567 | $13M | 0.4% | 2026-Q1 |
| GRIZZLYROCK CAPITAL, LLC added | 445,094 | $13M | 0.4% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 435,752 | $13M | 0.4% | 2026-Q1 |
| Empowered Funds, LLC added | 435,599 | $13M | 0.4% | 2026-Q1 |
| CITIGROUP INC added | 407,235 | $12M | 0.4% | 2026-Q1 |
| Quantinno Capital Management LP trimmed | 405,798 | $12M | 0.4% | 2026-Q1 |
| MACKENZIE FINANCIAL CORP added | 396,180 | $12M | 0.3% | 2026-Q1 |
| SG Americas Securities, LLC trimmed | 353,924 | $11M | 0.3% | 2026-Q1 |
| READYSTATE ASSET MANAGEMENT LP new | 350,842 | $10M | 0.3% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC added | 328,913 | $10M | 0.3% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 318,085 | $9M | 0.3% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 313,901 | $9M | 0.3% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 301,587 | $9M | 0.3% | 2026-Q1 |
| LPL Financial LLC added | 284,270 | $8M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 275,287 | $8M | 0.2% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 272,045 | $8M | 0.2% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 253,727 | $8M | 0.2% | 2026-Q1 |
| ExodusPoint Capital Management, LP added | 247,536 | $7M | 0.2% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 243,298 | $7M | 0.2% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 250,233 | $7M | 0.2% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 232,173 | $7M | 0.2% | 2026-Q1 |
| Edgestream Partners, L.P. added | 231,874 | $7M | 0.2% | 2026-Q1 |
| Rokos Capital Management LLP new | 229,817 | $7M | 0.2% | 2026-Q1 |
| Swiss National Bank | 226,032 | $7M | 0.2% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 225,438 | $7M | 0.2% | 2026-Q1 |
| GABELLI FUNDS LLC trimmed | 221,243 | $7M | 0.2% | 2026-Q1 |
| Lloyd Harbor Capital Management, LLC new | 220,000 | $7M | 0.2% | 2026-Q1 |
| Stanley-Laman Group, Ltd. added | 214,704 | $6M | 0.2% | 2026-Q1 |
| First Eagle Investment Management, LLC added | 213,752 | $6M | 0.2% | 2026-Q1 |
| Tiptree Advisors, LLC new | 205,000 | $6M | 0.2% | 2026-Q1 |
| Walleye Capital LLC trimmed | 201,569 | $6M | 0.2% | 2026-Q1 |
| Loews Corp | 200,000 | $6M | 0.2% | 2026-Q1 |
| SummitTX Capital, L.P. new | 197,018 | $6M | 0.2% | 2026-Q1 |
| Legal & General Group Plc trimmed | 196,036 | $6M | 0.2% | 2026-Q1 |
| Old West Investment Management, LLC new | 192,371 | $6M | 0.2% | 2026-Q1 |
| CenterBook Partners LP trimmed | 188,122 | $6M | 0.2% | 2026-Q1 |
| BARCLAYS PLC added | 184,999 | $6M | 0.2% | 2026-Q1 |
| STIFEL FINANCIAL CORP added | 182,686 | $5M | 0.2% | 2026-Q1 |
| GAMCO INVESTORS, INC. ET AL added | 179,164 | $5M | 0.2% | 2026-Q1 |
| Bridgewater Associates, LP added | 178,567 | $5M | 0.2% | 2026-Q1 |
| SEI INVESTMENTS CO added | 169,374 | $5M | 0.1% | 2026-Q1 |
| Qsemble Capital Management, LP added | 156,844 | $5M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 10,484,767 | $218M | 6.4% | 2025-Q4 stale |
| Orbis Allan Gray Ltd added | 3,804,561 | $79M | 2.3% | 2025-Q4 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC added | 794,711 | $17M | 0.5% | 2025-Q4 stale |
| Qube Research & Technologies Ltd added | 772,049 | $16M | 0.5% | 2025-Q2 stale |
| MASTERS CAPITAL MANAGEMENT LLC added | 700,000 | $15M | 0.4% | 2025-Q4 stale |
| Jain Global LLC added | 667,101 | $14M | 0.4% | 2025-Q4 stale |
| STEADFAST CAPITAL MANAGEMENT LP new | 444,000 | $11M | 0.3% | 2025-Q3 stale |
| Cubist Systematic Strategies, LLC trimmed | 376,728 | $9M | 0.3% | 2025-Q3 stale |
| Invenomic Capital Management LP added | 387,259 | $8M | 0.2% | 2025-Q4 stale |
| FRANKLIN RESOURCES INC trimmed | 330,705 | $8M | 0.2% | 2025-Q1 stale |
| Cambria Investment Management, L.P. added | 384,346 | $8M | 0.2% | 2025-Q4 stale |
| Clearbridge Investments, LLC added | 310,675 | $8M | 0.2% | 2025-Q1 stale |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 350,000 | $7M | 0.2% | 2025-Q4 stale |
| Man Group plc trimmed | 250,487 | $6M | 0.2% | 2025-Q1 stale |
| Arete Wealth Advisors, LLC trimmed | 5,653 | $5M | 0.2% | 2025-Q2 stale |
| DARK FOREST CAPITAL MANAGEMENT LP added | 238,404 | $5M | 0.1% | 2025-Q4 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.