Ticker · CUSIP 589889104
Holders (tracked)
15
Combined shares
5,871,827
Combined value
$460.76M
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
+4 vs previous quarter over the last 8.
SEC event timeline
24 events
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−83,194 shares · 2025Q4Position
- D.E. Shaw & Co. added2026-02-17+4,704 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+37,961 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−63,370 shares · 2025Q4Position
- Steve Cohen (Point72) opened position2026-02-17+436,531 shares · 2025Q4Position
- T. Rowe Price added2026-02-17+4,016 shares · 2025Q4Position
- Wellington Management added2026-02-17+86,504 shares · 2025Q4Position
- +6,800 shares · 2025Q4Position
- AQR Capital Management added2026-02-17+3,825 shares · 2025Q4Position
- Lee Ainslie (Maverick Capital) trimmed2026-02-13−1,124,048 shares · 2025Q4Position
- Renaissance Technologies added2026-02-12+51,300 shares · 2025Q4Position
- Norges Bank (Norway SWF) opened position2026-02-10+861,781 shares · 2025Q4Position
- Ken Fisher (Fisher Asset Mgmt) trimmed2026-02-09−16,606 shares · 2025Q4Position
- D.E. Shaw & Co. trimmed2025-11-14−101,265 shares · 2025Q3Position
- AQR Capital Management added2025-11-14+6,772 shares · 2025Q3Position
- Izzy Englander (Millennium Mgmt) trimmed2025-11-14−216,188 shares · 2025Q3Position
- Two Sigma Investments trimmed2025-11-14−331,435 shares · 2025Q3Position
- Lee Ainslie (Maverick Capital) added2025-11-14+230,806 shares · 2025Q3Position
- T. Rowe Price trimmed2025-11-14−91,497 shares · 2025Q3Position
- Wellington Management added2025-11-14+980,823 shares · 2025Q3Position
- Renaissance Technologies trimmed2025-11-13−96,000 shares · 2025Q3Position
- Norges Bank (Norway SWF) exited2025-11-13−574,422 shares · 2025Q3Position
- Ken Fisher (Fisher Asset Mgmt) added2025-11-12+6,164 shares · 2025Q3Position
- Norges Bank (Norway SWF) trimmed2025-11-12−48,036 shares · 2024Q3Position
Insider activity
No insider transactions in the last 30 days.
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions3
- Norges Bank (Norway SWF)+861,781$76.0M
- Steve Cohen (Point72)+436,531$38.5M
- Paul Tudor Jones (Tudor Investment)+6,800$599K
Added to6
- Wellington Management+86,504$7.6M
- Renaissance Technologies+51,300$4.5M
- Two Sigma Investments+37,961$3.3M
- D.E. Shaw & Co.+4,704$415K
- AQR Capital Management+3,825$337K
- T. Rowe Price+4,016$354
Trimmed4
- Lee Ainslie (Maverick Capital)−1,124,048$99.1M
- Ken Griffin (Citadel Advisors)−83,194$7.3M
- Izzy Englander (Millennium Mgmt)−63,370$5.6M
- Ken Fisher (Fisher Asset Mgmt)−16,606$1.5M
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 13 | $29.43B |
| 2022Q2 | 14 | $27.79B |
| 2022Q3 | 11 | $30.0M |
| 2022Q4 | 11 | $755.4M |
| 2023Q1 | 12 | $830.8M |
| 2023Q2 | 14 | $987.9M |
| 2023Q3 | 15 | $812.6M |
| 2023Q4 | 15 | $906.6M |
| 2024Q1 | 14 | $866.9M |
| 2024Q2 | 16 | $1.04B |
| 2024Q3 | 14 | $244.7M |
| 2024Q4 | 14 | $255.4M |
| 2025Q1 | 13 | $401.4M |
| 2025Q2 | 12 | $490.5M |
| 2025Q3 | 11 | $414.6M |
| 2025Q4 | 15 | $460.8M |
Congress members trading this stock
| Date | Member | Type | Amount range | Filing |
|---|---|---|---|---|
| 2025-09-25 | Lisa McClain | Sell | $1K – $15K | PDF ↗ |
| 2025-07-22 | Lisa McClain | Buy | $1K – $15K | PDF ↗ |
Who owns MMSI
15 super-investors · 2025Q4
Tracked stake
5.87M
shares
Combined value
$461M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New3Added6Trim6
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Wellington Management | 1.33M | $117M |
| 2 | Ken Griffin Citadel Advisors | 1.09M | $96M |
| 3 | Norges Bank Norway SWF | 861.8K | $76M |
| 4 | Lee Ainslie Maverick Capital | 486.2K | $43M |
| 5 | Steve Cohen Point72 | 436.5K | $38M |
| 6 | Two Sigma Investments | 379.7K | $33M |
| 7 | Ken Fisher Fisher Asset Mgmt | 205.0K | $18M |
| 8 | D.E. Shaw & Co. | 197.7K | $17M |
| 9 | Renaissance Technologies | 126.2K | $11M |
| 10 | Izzy Englander Millennium Mgmt | 50.0K | $4M |
| 11 | Izzy Englander Millennium Mgmt | 26.3K | $2M |
| 12 | AQR Capital Management | 24.8K | $2M |
| 13 | Paul Tudor Jones Tudor Investment | 6.8K | $599K |
| 14 | Ken Griffin Citadel Advisors | 5.4K | $476K |
| 15 | T. Rowe Price | 644.9K | $57K |
Recent moves
20 transactions
- +3,825 · 2025Q4
- +6,800 · 2025Q4
- +4,016 · 2025Q4
- +37,961 · 2025Q4
- +436,531 · 2025Q4
- −83,194 · 2025Q4
- +86,504 · 2025Q4
- −63,370 · 2025Q4
- +4,704 · 2025Q4
- −1,124,048 · 2025Q4
- +51,300 · 2025Q4
- +861,781 · 2025Q4
- −16,606 · 2025Q4
- TRIMD.E. Shaw & Co.−101,265 · 2025Q3
- −216,188 · 2025Q3
- −331,435 · 2025Q3
- +230,806 · 2025Q3
- TRIMT. Rowe Price−91,497 · 2025Q3
- +980,823 · 2025Q3
- +6,772 · 2025Q3
Embed this chart
Paste this iframe anywhere to embed the live MMSI chart.
<iframe src="https://openstocks.me/embed/stock/MMSI" width="100%" height="480" frameborder="0" loading="lazy" title="MMSI chart by OpenStocks" style="border:0;border-radius:12px;background:transparent"></iframe>