Who owns MRX
204 institutions reported holding MRX for 2026Q1, together 73% of the company, more than the 191 a quarter earlier.
204
Institutions reporting a position · as of 2026Q1 · up from 191 the quarter before
- Shares held by institutions
- 52.5M
Shares held by institutions · 73% of the company · long US equity positions only, as reported on Form 13F
- Reported value
- $2.33B
Reported value · at 2026-03-31 prices, not today's
- Top 5 holders
- 21%
Top 5 holders · of the whole company, between five filers
Details›
- Reporting quarter2026-03-31
- 2026Q1
- Quarters on record
- 8
- New positions
- 37
- Positions exited
- 27
- Added to
- 79
- Reduced
- 56
- Top 10 holdersof the company
- 33%
| Quarter | Filers | Shares | Reported value |
|---|---|---|---|
| 2026Q1 | 204 | 52.5M | $2.33B |
| 2025Q4 | 191 | 51.1M | $1.96B |
| 2025Q3 | 189 | 51.3M | $1.72B |
| 2025Q2 | 192 | 50.6M | $2.00B |
| 2025Q1 | 121 | 27.4M | $1.19B |
| 2024Q4 | 106 | 26.6M | $830M |
| 2024Q3 | 70 | 16.8M | $397M |
| 2024Q2 | 59 | 14.7M | $295M |
| Holder | Shares | % of company | Value |
|---|---|---|---|
| BlackRock Inc. | 4.4M | 6.1% | $196M |
| Capital International Investors | 3.5M | 4.8% | $155M |
| FMR LLC | 3.5M | 4.8% | $155M |
| LOOMIS SAYLES & CO L P | 1.9M | 2.7% | $86M |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1.9M | 2.6% | $85M |
| ALLIANCEBERNSTEIN L.P. | 1.7M | 2.4% | $66M |
| SAMLYN CAPITAL, LLC | 1.7M | 2.3% | $75M |
| TWO SIGMA INVESTMENTS, LP | 1.7M | 2.3% | $75M |
| JENNISON ASSOCIATES LLC | 1.6M | 2.2% | $72M |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 1.6M | 2.2% | $70M |
SEC Form 13F data sets (DERA bulk files). 13F is quarterly, filed up to 45 days late, and covers long US equity positions only, no shorts, no derivatives, nothing held below the reporting threshold.
reading the register…