Marex Group plc (MRX) Ownership
MRX ownership summary
as of October 18, 2026- Institutions
- 81.9% of shares outstanding
- Insiders
- 6.75% of shares outstanding
- Shares outstanding
- 71.9M
- Float
- 66.2M shares available to trade
- Short interest
- 3.92% 2.6M shares short
- Days to cover
- 3.16 short interest up 3.0% vs prior month
- Institutions 81.85%
- Insiders 6.75%
- Other investors 11.39%
MRX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | FMR Inc | 7.46% | 5.4M | $378.5M | +1.9M (+54.2%) | June 30, 2026 |
| 2 | T. Rowe Price Associates, Inc. | 6.84% | 4.9M | $347.1M | +3.0M (+158.3%) | June 30, 2026 |
| 3 | BlackRock Inc | 6.39% | 4.6M | $323.9M | +204,824 (+4.7%) | June 30, 2026 |
| 4 | Capital Research & Mgmt Co - Division 3 | 4.54% | 3.3M | $230.1M | −223,729 (−6.4%) | June 30, 2026 |
| 5 | AllianceBernstein L.P. | 3.62% | 2.6M | $183.3M | +870,311 (+50.3%) | June 30, 2026 |
| 6 | Wasatch Advisors LP | 2.34% | 1.7M | $118.7M | +1.5M (+883.6%) | June 30, 2026 |
| 7 | Loomis, Sayles & Company LP | 2.26% | 1.6M | $114.7M | −291,920 (−15.2%) | June 30, 2026 |
| 8 | Samlyn Capital, LLC | 2.06% | 1.5M | $104.6M | −205,627 (−12.2%) | June 30, 2026 |
| 9 | Amvescap Plc. | 1.95% | 1.4M | $99.0M | +31,784 (+2.3%) | June 30, 2026 |
| 10 | Ophir Asset Management Pty Ltd | 1.93% | 1.4M | $98.1M | +144,965 (+11.6%) | June 30, 2026 |
| 11 | Two Sigma Investments LLC | 1.86% | 1.3M | $94.1M | −346,124 (−20.6%) | June 30, 2026 |
| 12 | Victory Capital Management Inc. | 1.80% | 1.3M | $91.0M | −23,479 (−1.8%) | June 30, 2026 |
| 13 | Granahan Investment Management Inc.. | 1.74% | 1.3M | $88.4M | +30,533 (+2.5%) | June 30, 2026 |
| 14 | Morgan Stanley - Brokerage Accounts | 1.63% | 1.2M | $82.5M | +692,424 (+145.1%) | June 30, 2026 |
| 15 | Royce & Associates, LP | 1.54% | 1.1M | $78.3M | −141,451 (−11.3%) | June 30, 2026 |
| 16 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 1.45% | 1.0M | $73.6M | +314,286 (+43.1%) | June 30, 2026 |
| 17 | State Street Corp | 1.43% | 1.0M | $72.4M | +153,270 (+17.5%) | June 30, 2026 |
| 18 | William Blair Investment Management, LLC | 1.40% | 1.0M | $71.1M | −556,982 (−35.6%) | June 30, 2026 |
| 19 | Ameriprise Financial Inc | 1.26% | 904K | $63.7M | −50,080 (−5.2%) | June 30, 2026 |
| 20 | Geode Capital Management, LLC | 1.25% | 897K | $63.3M | +170,759 (+23.5%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 12 holders added 9.0M shares and 8 cut 1.8M.
MRX top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | American Funds SMALLCAP World A | 4.42% | 3.2M | $224.0M | −311,414 (−8.9%) | June 30, 2026 |
| 2 | iShares Russell 2000 ETF | 2.26% | 1.6M | $114.7M | −12,807 (−0.8%) | September 30, 2026 |
| 3 | Invesco Discovery A | 1.84% | 1.3M | $93.2M | +109,095 (+9.0%) | August 31, 2026 |
| 4 | T. Rowe Price Integrated US Sm Gr Eq | 1.73% | 1.2M | $87.9M | — | August 31, 2026 |
| 5 | Fidelity Value | 1.54% | 1.1M | $78.0M | — | August 31, 2026 |
| 6 | T. Rowe Price Comm & Tech Investor | 1.08% | 777K | $54.8M | — | August 31, 2026 |
| 7 | Fidelity Small Cap Value Fund | 1.06% | 762K | $53.7M | −57,700 (−7.0%) | July 31, 2026 |
| 8 | American Century Small Cap Value Inv | 1.04% | 750K | $52.9M | −375,000 (−33.3%) | June 30, 2026 |
| 9 | Strategic Advisers Fidelity US TtlStk | 0.98% | 705K | $49.7M | +16,728 (+2.4%) | August 31, 2026 |
| 10 | Fidelity Small Cap Index | 0.95% | 680K | $47.9M | +5,984 (+0.9%) | July 31, 2026 |
| 11 | T. Rowe Price New Horizons | 0.94% | 675K | $47.6M | −291 (−0.0%) | August 31, 2026 |
| 12 | AB Small Cap Growth A | 0.81% | 581K | $41.0M | −7,678 (−1.3%) | August 31, 2026 |
| 13 | AB Discovery Growth A | 0.80% | 573K | $40.4M | −5,081 (−0.9%) | August 31, 2026 |
| 14 | Vanguard Explorer Inv | 0.78% | 563K | $39.7M | +523,331 (+1,312.8%) | June 30, 2026 |
| 15 | Loomis Sayles Small Cap Growth Instl | 0.77% | 551K | $38.8M | +37,276 (+7.3%) | August 31, 2026 |
| 16 | CT (Lux) American Smaller Com 9U USD | 0.76% | 547K | $38.6M | +11,682 (+2.2%) | August 31, 2026 |
| 17 | Victory Pioneer Select Mid Cap Growth A | 0.72% | 517K | $36.5M | −18,658 (−3.5%) | June 30, 2026 |
| 18 | Victory Trivalent International Sm-Cp I | 0.69% | 495K | $34.9M | — | June 30, 2026 |
| 19 | BGF World Financials A2 | 0.68% | 488K | $34.4M | — | June 30, 2026 |
| 20 | Artisan Small Cap Investor | 0.66% | 473K | $33.4M | +12,694 (+2.8%) | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
MRX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns MRX
Institutional investors own 81.9% of Marex's shares and insiders 6.75%. The largest holder is FMR Inc with 7.46% of the shares (5.4M), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 8 reduced their stake in the latest filings. Short interest is 3.92% of the float, or 3.16 days of average trading volume. The share count rose 25.6% since 2019.
Related: MRX analyst forecast, MRX key metrics, MRX dividend history. See the MRX stock overview for the latest quote and news.
MRX ownership FAQ
Who owns the most Marex stock?
The largest shareholders of Marex are FMR Inc (7.46%), T. Rowe Price Associates, Inc. (6.84%), BlackRock Inc (6.39%), Capital Research & Mgmt Co - Division 3 (4.54%), AllianceBernstein L.P. (3.62%).
What percentage of Marex is owned by institutions?
Institutions hold 81.9% of Marex's shares outstanding; insiders hold 6.75%.
Which funds own Marex?
The largest fund holders of Marex are American Funds SMALLCAP World A (4.42%), iShares Russell 2000 ETF (2.26%), Invesco Discovery A (1.84%), T. Rowe Price Integrated US Sm Gr Eq (1.73%), Fidelity Value (1.54%).
What is Marex's short interest?
2.6M shares of Marex were sold short, 3.92% of the float; at the average daily volume it would take 3.16 days to cover.
How many shares of Marex are outstanding?
Marex has 71.9M shares outstanding, of which 66.2M are in the public float.