- Quarter end
- 31 Mar 2025
- the date the book describes
- Filed
- 12 Aug 2025
- latest of these filings; the earliest 14 May 2025
- Managers listing it
- 4
- at least, of 95 tracked, among listed positions
- Comparable managers
- 95
- filed both Q4 2024 and Q1 2025; 4 listed it in both
- Shares listed
- 20,025,409
- combined, among listed positions
- Reported value
- $291m
- combined, at the quarter end
Among the 95 comparable managers: 2 buyers (opened or added shares) and 4 sellers (trimmed or exited), at least, among listed positions. Their net change in shares is not known from listed positions, because at least one of them lists it in only one of the two quarters.
Managers listing MIR in Q1 2025
4 of 4 holders
| Action | Filing | |||||
|---|---|---|---|---|---|---|
| Janus Henderson Group Ltd | 8,587,664 | $126m | 0.07% | Added | +257,169 | 15 May 2025 (the filing on sec.gov) |
| Maverick Capital Ltd | 8,056,109 | $117m | 2.06% | Added | +1,878,498 | 15 May 2025 (the filing on sec.gov) |
| Arrowstreet Capital LP | 2,789,509 | $40m | under 0.1% | Trimmed | -1,425,412 | 14 May 2025 (the filing on sec.gov) |
| GAMCO Investors Inc | 592,127 | $8.6m | 0.09% | Trimmed | -7,507 | 14 May 2025 (the filing on sec.gov) |
Largest increases and reductions, by shares
Increases
- Maverick Capital Ltdexisting position · 8,056,109 shares now+1,878,498
- Janus Henderson Group Ltdexisting position · 8,587,664 shares now+257,169
Reductions
- Arrowstreet Capital LPexisting position · 2,789,509 shares now-1,425,412
- GAMCO Investors Incexisting position · 592,127 shares now-7,507
New positions and exits
New (0)
No new position among listed positions.
Exited (2)
- Discovery Capital Management LLCwas $6.3m
- Moore Capital Management LPwas $1.0m
Ownership over time
Tracked managers listing it, at least.
| Quarter | Holders | Reported value | Buyers | Sellers |
|---|---|---|---|---|
| Q4 2021 | 2 | $10m | n.a. | n.a. |
| Q1 2022 | 1 | $3.0m | n.a. | n.a. |
| Q2 2022 | 1 | $2.0m | n.a. | n.a. |
| Q3 2022 | 1 | $88m | n.a. | n.a. |
| Q4 2022 | 1 | $77m | n.a. | n.a. |
| Q1 2023 | 4 | $105m | n.a. | n.a. |
| Q2 2023 | 2 | $84m | n.a. | n.a. |
| Q3 2023 | 2 | $71m | n.a. | n.a. |
| Q4 2023 | 2 | $104m | 1 | 1 |
| Q1 2024 | 3 | $116m | 2 | 1 |
| Q2 2024 | 3 | $103m | 1 | 2 |
| Q3 2024 | 4 | $105m | 2 | 2 |
| Q4 2024 | 7 | $349m | 5 | 2 |
| Q1 2025 | 4 | $291m | 2 | 4 |
| Q2 2025 | 8 | $442m | 4 | 4 |
| Q3 2025 | 9 | $431m | 5 | 5 |
| Q4 2025 | 6 | $241m | 10 | 17 |
| Q1 2026 | 7 | $261m | 14 | 12 |
| Q2 2026 | 8 | $287m | 14 | 12 |
Compare with…
Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.
MIR and GE →MIR and LRCX →MIR and GEV →Choose a stock to compare with MIR →
How much of the picture this is
A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.
Which funds own MIR, latest filings →Back to the 13F Explorer →