Ticker · CUSIP 578605107
Holders (tracked)
6
Combined shares
737,262
Combined value
$13.80M
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
+3 vs previous quarter over the last 8.
SEC event timeline
9 events
- AQR Capital Management trimmed2026-02-17−27,632 shares · 2025Q4Position
- D.E. Shaw & Co. opened position2026-02-17+19,416 shares · 2025Q4Position
- +153,200 shares · 2025Q4Position
- +103,463 shares · 2025Q4Position
- Renaissance Technologies trimmed2026-02-12−83,800 shares · 2025Q4Position
- First Eagle Investment Management added2026-02-04+3,500 shares · 2025Q4Position
- AQR Capital Management added2025-11-14+34,166 shares · 2025Q3Position
- Renaissance Technologies added2025-11-13+11,000 shares · 2025Q3Position
- First Eagle Investment Management added2025-11-12+500 shares · 2025Q3Position
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
- Izzy Englander (Millennium Mgmt)+153,200$2.9M
- Ken Griffin (Citadel Advisors)+103,463$1.9M
- D.E. Shaw & Co.+19,416$363K
Added to1
- First Eagle Investment Management+3,500$66K
Trimmed2
- Renaissance Technologies−83,800$1.6M
- AQR Capital Management−27,632$517K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 7 | $9.6M |
| 2022Q2 | 5 | $5.1M |
| 2022Q3 | 6 | $4.1M |
| 2022Q4 | 3 | $4.4M |
| 2023Q1 | 5 | $4.9M |
| 2023Q2 | 7 | $10.9M |
| 2023Q3 | 5 | $8.5M |
| 2023Q4 | 4 | $11.5M |
| 2024Q1 | 6 | $11.5M |
| 2024Q2 | 7 | $19.3M |
| 2024Q3 | 7 | $9.9M |
| 2024Q4 | 7 | $8.9M |
| 2025Q1 | 7 | $10.5M |
| 2025Q2 | 4 | $8.6M |
| 2025Q3 | 3 | $7.8M |
| 2025Q4 | 6 | $13.8M |
Who owns MEC
6 super-investors · 2025Q4
Tracked stake
737.3K
shares
Combined value
$14M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New3Added1Trim2
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | First Eagle Investment Management | 358.1K | $7M |
| 2 | Izzy Englander Millennium Mgmt | 153.2K | $3M |
| 3 | Ken Griffin Citadel Advisors | 103.5K | $2M |
| 4 | Renaissance Technologies | 71.2K | $1M |
| 5 | AQR Capital Management | 31.9K | $597K |
| 6 | D.E. Shaw & Co. | 19.4K | $363K |
Recent moves
20 transactions
- +103,463 · 2025Q4
- −27,632 · 2025Q4
- +19,416 · 2025Q4
- +153,200 · 2025Q4
- −83,800 · 2025Q4
- +3,500 · 2025Q4
- +34,166 · 2025Q3
- +11,000 · 2025Q3
- +500 · 2025Q3
- −44,435 · 2025Q2
- −112,350 · 2025Q2
- +58,100 · 2025Q2
- +2,200 · 2025Q2
- +82,006 · 2025Q1
- −1,834 · 2025Q1
- −26,800 · 2025Q1
- +19,500 · 2025Q1
- +30,344 · 2024Q4
- −4,501 · 2024Q4
- +54,632 · 2024Q4
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