- Quarter end
- 31 Dec 2025
- the date the book describes
- Filed
- 17 Feb 2026
- latest of these filings; the earliest 12 Feb 2026
- Managers listing it
- 7
- at least, of 95 tracked, among listed positions
- Comparable managers
- 92
- filed both Q3 2025 and Q4 2025; 1 listed it in both
- Shares listed
- 2,527,378
- combined, among listed positions
- Reported value
- $241m
- combined, at the quarter end
Among the 92 comparable managers: 6 buyers (opened or added shares) and 2 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +775.
Managers listing MBB in Q4 2025
7 of 7 holders
| Action | Filing | |||||
|---|---|---|---|---|---|---|
| Bridgewater Associates LP | 1,375,400 | $131m | 0.48% | Added | +20,300 | 13 Feb 2026 (the filing on sec.gov) |
| AllianceBernstein LP | 768,215 | $73m | under 0.1% | Added | +80,313 | 17 Feb 2026 (the filing on sec.gov) |
| Fidelity (FMR LLC) | 351,630 | $33m | under 0.1% | Trimmed | -2,491 | 17 Feb 2026 (the filing on sec.gov) |
| AQR Capital Management LLC | 10,951 | $1.0m | under 0.1% | Added | +1,831 | 17 Feb 2026 (the filing on sec.gov) |
| Renaissance Technologies LLC | 8,386 | $799k | under 0.1% | New | new | 12 Feb 2026 (the filing on sec.gov) |
| Millennium Management LLC | 8,315 | $792k | under 0.1% | Added | +4,086 | 17 Feb 2026 (the filing on sec.gov) |
| Squarepoint Ops LLC | 4,481 | $427k | under 0.1% | New | new | 13 Feb 2026 (the filing on sec.gov) |
Largest increases and reductions, by shares
Increases
- AllianceBernstein LPexisting position · 768,215 shares now+80,313
- Bridgewater Associates LPexisting position · 1,375,400 shares now+20,300
- Renaissance Technologies LLCnew position · 8,386 shares now+8,386
- Squarepoint Ops LLCnew position · 4,481 shares now+4,481
- Millennium Management LLCexisting position · 8,315 shares now+4,086
Reductions
- Fidelity (FMR LLC)existing position · 351,630 shares now-2,491
New positions and exits
New (2)
Exited (1)
Ownership over time
Tracked managers listing it, at least.
| Quarter | Holders | Reported value | Buyers | Sellers |
|---|---|---|---|---|
| Q1 2014 | 1 | $16m | n.a. | n.a. |
| Q1 2016 | 1 | $9.3m | n.a. | n.a. |
| Q3 2016 | 1 | $6.4m | n.a. | n.a. |
| Q1 2018 | 1 | $136m | n.a. | n.a. |
| Q3 2018 | 1 | $41m | n.a. | n.a. |
| Q1 2019 | 1 | $47m | n.a. | n.a. |
| Q2 2019 | 1 | $18m | n.a. | n.a. |
| Q3 2019 | 1 | $175m | n.a. | n.a. |
| Q4 2019 | 1 | $331m | n.a. | n.a. |
| Q1 2020 | 2 | $501m | n.a. | n.a. |
| Q2 2020 | 4 | $645m | n.a. | n.a. |
| Q3 2020 | 4 | $631m | n.a. | n.a. |
| Q4 2020 | 2 | $130m | n.a. | n.a. |
| Q1 2021 | 4 | $1.1bn | n.a. | n.a. |
| Q2 2021 | 3 | $1.2bn | n.a. | n.a. |
| Q3 2021 | 2 | $190m | n.a. | n.a. |
| Q4 2021 | 3 | $538m | n.a. | n.a. |
| Q1 2022 | 1 | $66m | n.a. | n.a. |
| Q2 2022 | 2 | $338m | n.a. | n.a. |
| Q3 2022 | 2 | $471m | n.a. | n.a. |
| Q4 2022 | 1 | $138m | n.a. | n.a. |
| Q1 2023 | 1 | $139m | n.a. | n.a. |
| Q2 2023 | 4 | $338m | n.a. | n.a. |
| Q3 2023 | 2 | $176m | n.a. | n.a. |
| Q4 2023 | 2 | $260m | 1 | 2 |
| Q1 2024 | 2 | $916m | 2 | 0 |
| Q2 2024 | 2 | $141m | 1 | 1 |
| Q3 2024 | 2 | $142m | 0 | 2 |
| Q4 2024 | 1 | $132m | 1 | 0 |
| Q1 2025 | 2 | $225m | 2 | 0 |
| Q2 2025 | 1 | $137m | 1 | 1 |
| Q3 2025 | 1 | $129m | 0 | 1 |
| Q4 2025 | 1 | $131m | 6 | 2 |
| Q1 2026 | 3 | $208m | 8 | 3 |
| Q2 2026 | 3 | $289m | 7 | 4 |
Compare with…
Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.
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 MBB, latest filings →Back to the 13F Explorer →