Who owns SEACOR Marine Holdings Inc. (SMHI)
Which tracked institutional funds hold SMHI, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See SMHI company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 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 SMHI is one-sided between 2025-Q4 and 2026-Q1: 17 added or opened and 2 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
SMHI’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in SMHI 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 90 tracked filers holding SMHI, 41 increased or opened the position and 43 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
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 SMHI 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 3
- VANGUARD CAPITAL MANAGEMENT LLC$7M
- VANGUARD FIDUCIARY TRUST CO$962K
- VANGUARD PORTFOLIO MANAGEMENT LLC$906K
Full exits 2
- VANGUARD GROUP INC$8M
- EPACRIA CAPITAL PARTNERS, LLC$934K
Largest adds
- Oppenheimer & Close, LLC$7M
- BlackRock, Inc.$2M
- DIMENSIONAL FUND ADVISORS LP$1M
- First Eagle Investment Management, LLC$975K
- GEODE CAPITAL MANAGEMENT, LLC$682K
- CITADEL ADVISORS LLC$582K
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 |
|---|---|---|---|---|
| BlackRock, Inc. trimmed | 1,539,507 | $11M | 10.9% | 2026-Q1 |
| Oppenheimer & Close, LLC added | 1,381,367 | $10M | 9.8% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,252,720 | $9M | 8.9% | 2026-Q1 |
| First Eagle Investment Management, LLC trimmed | 1,070,489 | $8M | 7.6% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,017,787 | $7M | 7.2% | 2026-Q1 |
| ROBOTTI ROBERT trimmed | 767,946 | $5M | 5.4% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 503,611 | $4M | 3.6% | 2026-Q1 |
| STATE STREET CORP trimmed | 498,529 | $4M | 3.5% | 2026-Q1 |
| Cerity Partners LLC trimmed | 434,932 | $3M | 3.1% | 2026-Q1 |
| FIRST MANHATTAN CO. LLC. trimmed | 320,585 | $2M | 2.3% | 2026-Q1 |
| MORGAN STANLEY added | 252,311 | $2M | 1.8% | 2026-Q1 |
| OPPENHEIMER & CO INC added | 223,000 | $2M | 1.6% | 2026-Q1 |
| Glenorchy Capital Ltd added | 210,927 | $2M | 1.5% | 2026-Q1 |
| SEMPER AUGUSTUS INVESTMENTS GROUP LLC | 208,175 | $1M | 1.5% | 2026-Q1 |
| NORTHERN TRUST CORP added | 195,091 | $1M | 1.4% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 147,275 | $1M | 1.1% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 134,348 | $962K | 0.9% | 2026-Q1 |
| HighTower Advisors, LLC trimmed | 128,775 | $922K | 0.9% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 126,504 | $906K | 0.9% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 120,400 | $862K | 0.9% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 119,468 | $855K | 0.8% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 89,776 | $643K | 0.6% | 2026-Q1 |
| Nuveen, LLC added | 70,360 | $504K | 0.5% | 2026-Q1 |
| UBS Group AG added | 65,057 | $466K | 0.5% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed | 64,070 | $459K | 0.5% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 59,650 | $427K | 0.4% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 58,210 | $417K | 0.4% | 2026-Q1 |
| Bank of New York Mellon Corp added | 53,553 | $383K | 0.4% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 47,725 | $342K | 0.3% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 46,089 | $330K | 0.3% | 2026-Q1 |
| Perennial Advisors, LLC | 46,038 | $330K | 0.3% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP added | 38,722 | $277K | 0.3% | 2026-Q1 |
| Wilmington Savings Fund Society, FSB | 38,567 | $276K | 0.3% | 2026-Q1 |
| Invesco Ltd. trimmed | 29,306 | $210K | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 28,672 | $205K | 0.2% | 2026-Q1 |
| Empowered Funds, LLC trimmed | 28,670 | $205K | 0.2% | 2026-Q1 |
| BARCLAYS PLC trimmed | 28,421 | $203K | 0.2% | 2026-Q1 |
| STEPHENS INC /AR/ | 23,536 | $169K | 0.2% | 2026-Q1 |
| Hilltop Holdings Inc. new | 20,600 | $147K | 0.1% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 19,074 | $137K | 0.1% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC trimmed | 16,337 | $117K | 0.1% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 15,188 | $109K | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 16,090 | $97K | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ | 13,512 | $97K | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 12,764 | $92K | 0.1% | 2026-Q1 |
| XTX Topco Ltd trimmed | 12,535 | $90K | 0.1% | 2026-Q1 |
| MetLife Investment Management, LLC added | 12,472 | $89K | 0.1% | 2026-Q1 |
| INTECH INVESTMENT MANAGEMENT LLC added | 12,193 | $87K | 0.1% | 2026-Q1 |
| MIRABELLA FINANCIAL SERVICES LLP new | 11,255 | $81K | 0.1% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 10,933 | $78K | 0.1% | 2026-Q1 |
| Almanack Investment Partners, LLC. new | 10,905 | $78K | 0.1% | 2026-Q1 |
| Pathstone Holdings, LLC | 10,825 | $78K | 0.1% | 2026-Q1 |
| FMR LLC added | 10,765 | $77K | 0.1% | 2026-Q1 |
| Callan Family Office, LLC added | 10,451 | $75K | 0.1% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 10,186 | $73K | 0.1% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 9,477 | $68K | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 8,253 | $59K | 0.1% | 2026-Q1 |
| Tower Research Capital LLC (TRC) added | 6,566 | $47K | 0.0% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 5,718 | $41K | 0.0% | 2026-Q1 |
| Police & Firemen's Retirement System of New Jersey | 4,890 | $35K | 0.0% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 4,662 | $33K | 0.0% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND trimmed | 4,203 | $30K | 0.0% | 2026-Q1 |
| Ameritas Investment Partners, Inc. | 1,989 | $14K | 0.0% | 2026-Q1 |
| Legal & General Group Plc | 1,890 | $14K | 0.0% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 1,816 | $13K | 0.0% | 2026-Q1 |
| PNC FINANCIAL SERVICES GROUP, INC. trimmed | 1,804 | $13K | 0.0% | 2026-Q1 |
| ROYAL LONDON ASSET MANAGEMENT LTD | 1,550 | $11K | 0.0% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 1,181 | $8K | 0.0% | 2026-Q1 |
| MV CAPITAL MANAGEMENT, INC. | 1,131 | $8K | 0.0% | 2026-Q1 |
| CITIGROUP INC trimmed | 1,014 | $7K | 0.0% | 2026-Q1 |
| NISA INVESTMENT ADVISORS, LLC | 1,006 | $7K | 0.0% | 2026-Q1 |
| Sterling Capital Management LLC trimmed | 723 | $5K | 0.0% | 2026-Q1 |
| Ascentis Independent Advisors new | 600 | $4K | 0.0% | 2026-Q1 |
| CWM, LLC added | 557 | $4K | 0.0% | 2026-Q1 |
| GAMMA Investing LLC trimmed | 243 | $2K | 0.0% | 2026-Q1 |
| VANGUARD GROUP INC added | 1,274,560 | $8M | 7.6% | 2025-Q4 stale |
| Carlyle Group Inc. | 1,355,761 | $7M | 6.8% | 2025-Q1 stale |
| EPACRIA CAPITAL PARTNERS, LLC | 155,230 | $934K | 0.9% | 2025-Q4 stale |
| Marex Group plc added | 61,852 | $313K | 0.3% | 2025-Q1 stale |
| Trexquant Investment LP trimmed | 29,518 | $192K | 0.2% | 2025-Q3 stale |
| BARINGTON COMPANIES MANAGEMENT, LLC new | 25,000 | $162K | 0.2% | 2025-Q3 stale |
| Capricorn Fund Managers Ltd | 26,235 | $133K | 0.1% | 2025-Q1 stale |
| HRT FINANCIAL LP trimmed | 19,767 | $128K | 0.1% | 2025-Q3 stale |
| RAYMOND JAMES FINANCIAL INC added | 15,065 | $98K | 0.1% | 2025-Q3 stale |
| MILLENNIUM MANAGEMENT LLC trimmed | 13,474 | $87K | 0.1% | 2025-Q3 stale |
| EXCHANGE TRADED CONCEPTS, LLC added | 17,233 | $87K | 0.1% | 2025-Q1 stale |
| HSBC HOLDINGS PLC trimmed | 13,538 | $81K | 0.1% | 2025-Q4 stale |
| Corebridge Financial, Inc. trimmed | 11,947 | $60K | 0.1% | 2025-Q1 stale |
| LEVIN CAPITAL STRATEGIES, L.P. trimmed | 10,000 | $60K | 0.1% | 2025-Q4 stale |
| Valeo Financial Advisors, LLC | 10,000 | $60K | 0.1% | 2025-Q4 stale |
| Squarepoint Ops LLC trimmed | 10,913 | $55K | 0.1% | 2025-Q1 stale |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 10,034 | $51K | 0.1% | 2025-Q1 stale |
| ACADIAN ASSET MANAGEMENT LLC added | 3,497 | $21K | 0.0% | 2025-Q4 stale |
| US BANCORP \DE\ | 1,648 | $11K | 0.0% | 2025-Q3 stale |
| BESSEMER GROUP INC trimmed | 2,000 | $10K | 0.0% | 2025-Q2 stale |
| SIMPLEX TRADING, LLC trimmed | 814 | $5K | 0.0% | 2025-Q4 stale |
| AMALGAMATED BANK trimmed | 686 | $4K | 0.0% | 2025-Q4 stale |
| ORG Partners LLC | 600 | $4K | 0.0% | 2025-Q4 stale |
| GROUP ONE TRADING LLC | 435 | $3K | 0.0% | 2025-Q4 stale |
| OSAIC HOLDINGS, INC. | 292 | $2K | 0.0% | 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.