- Quarter end
- 31 Mar 2025
- the date the book describes
- Filed
- 15 May 2025
- latest of these filings; the earliest 13 May 2025
- Managers listing it
- 6
- at least, of 95 tracked, among listed positions
- Comparable managers
- 95
- filed both Q4 2024 and Q1 2025; 3 listed it in both
- Shares listed
- 128,100,325
- combined, among listed positions
- Reported value
- $2.9bn
- combined, at the quarter end
Among the 95 comparable managers: 5 buyers (opened or added shares) and 1 seller (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 SIRI in Q1 2025
6 of 6 holders
| Action | Filing | |||||
|---|---|---|---|---|---|---|
| Berkshire Hathaway Inc | 119,776,692 | $2.7bn | 1.04% | Added | +2,308,119 | 15 May 2025 (the filing on sec.gov) |
| D. E. Shaw & Co. | 4,397,102 | $99m | 0.09% | Added | +1,344,815 | 15 May 2025 (the filing on sec.gov) |
| AQR Capital Management LLC | 1,957,518 | $44m | under 0.1% | Added | n.a. | 15 May 2025 (the filing on sec.gov) |
| Two Sigma Investments LP | 1,294,484 | $29m | 0.06% | Added | n.a. | 15 May 2025 (the filing on sec.gov) |
| GAMCO Investors Inc | 477,433 | $11m | 0.12% | Trimmed | -32,559 | 14 May 2025 (the filing on sec.gov) |
| Quantbot Technologies LP | 197,096 | $4.4m | 0.14% | New | new | 13 May 2025 (the filing on sec.gov) |
Largest increases and reductions, by shares
Increases
- Berkshire Hathaway Incexisting position · 119,776,692 shares now+2,308,119
- D. E. Shaw & Co.existing position · 4,397,102 shares now+1,344,815
- Quantbot Technologies LPnew position · 197,096 shares now+197,096
Reductions
- GAMCO Investors Incexisting position · 477,433 shares now-32,559
New positions and exits
New (1)
Exited (0)
No exit shown by a manager’s own filing.
Ownership over time
Tracked managers listing it, at least.
| Quarter | Holders | Reported value | Buyers | Sellers |
|---|---|---|---|---|
| Q3 2024 | 9 | $2.6bn | 9 | 0 |
| Q4 2024 | 3 | $2.8bn | 2 | 3 |
| Q1 2025 | 6 | $2.9bn | 5 | 1 |
| Q2 2025 | 5 | $3.1bn | 2 | 2 |
| Q3 2025 | 10 | $3.1bn | 7 | 3 |
| Q4 2025 | 5 | $2.6bn | 8 | 23 |
| Q1 2026 | 5 | $2.9bn | 16 | 13 |
| Q2 2026 | 8 | $3.8bn | 19 | 13 |
Compare with…
Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.
SIRI and NFLX →SIRI and TMUS →SIRI and CMCSA →Choose a stock to compare with SIRI →
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 SIRI, latest filings →Back to the 13F Explorer →