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Of the 16 tracked institutions holding SIRI, 10 have a 3-year clone track record — 7 of them beat the S&P. Average holder's clone alpha: +3.0pt. It's a gauge of who owns the name, not just how many.
Among the 16 tracked institutional investors we monitor, SIRI (SIRIUSXM HOLDINGS INC) is held with a combined value of $3.76B across 165,509,276 shares. The largest holder is BERKSHIRE HATHAWAY INC with a position worth $2.88B (1.09% of their portfolio). Magnetar Financial LLC opened a new position in the most recent quarter. 7 funds increased their holdings. 7 funds reduced their position.
Total Institutional Value
$3.76B
Total Shares Held
165,509,276
Institutional Holders
16
% of Shares Outstanding
49.2%
of 336.62M shares · SEC 2026-04-28
Days to Cover
7.2-0.4%
36.42M shares short · FINRA 2026-06-30
Tracked 13F institutions hold 49.2% of SIRI's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-04-28), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
2
$83.24M
0
$0
Total Transactions
2
Last 12 months
| Date | Insider | Code | Type | Shares | Value |
|---|---|---|---|---|---|
| Jul 31, 2025 | BERKSHIRE HATHAWAY INC | P | Purchase | 1,977,837 | $41.62M |
| Jul 31, 2025 | WARREN E BUFFETT | P | Purchase | 1,977,837 | $41.62M |
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | BERKSHIRE HATHAWAY INC | $2.88B | 1.09% | - |
| 2 | VANGUARD GROUP INC | $366.32M | 0.01% | -1.9% |
| 3 | BlackRock, Inc. | $222.15M | 0.00% | -4.2% |
| 4 | STATE STREET CORP | $81.88M | 0.00% | +1.7% |
| 5 | CITADEL ADVISORS LLC | $75.28M | 0.05% | +312.7% |
| 6 | AQR CAPITAL MANAGEMENT LLC | $68.30M | 0.03% | +106.1% |
| 7 | Gotham Asset Management, LLC | $28.59M | 0.09% | +46.9% |
| 8 | MILLENNIUM MANAGEMENT LLC | $17.73M | 0.01% | -6.7% |
| 9 | Point72 Asset Management, L.P. | $8.20M | 0.01% | -62.5% |
| 10 | PRICE T ROWE ASSOCIATES INC /MD/ | $3.72M | 0.00% | +8.0% |
| Member | Type | Date |
|---|---|---|
| John W Hickenlooper | Sell | Feb 5, 2026 |
| August Lee II. Pfluger | Sell | Jan 13, 2026 |
| August Lee II. Pfluger | Sell | Jul 1, 2025 |
| John W Hickenlooper | Sell |
As of the latest SEC 13F filings, BERKSHIRE HATHAWAY INC is the largest institutional holder of SIRI with a position worth $2.88B, representing 1.09% of their portfolio. In total, 16 institutional investors hold SIRI with a combined value of $3.76B.
In the most recent quarter, 1 fund opened a new position in SIRI. Additionally, 7 increased their holdings and 7 reduced their positions.
Institutional investors hold $3.76B worth of SIRI stock across 16 positions. The largest institutional holder is BERKSHIRE HATHAWAY INC with $2.88B in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For SIRI, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their SIRI positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
| Apr 25, 2025 |
| Thomas H. Jr. Kean | exchange | Sep 10, 2024 |
| August Lee II. Pfluger | exchange | Sep 10, 2024 |
Last Close
$29.80
2026-07-24
YTD
+45.3%
87% of 52-week range
