Supply breakdown
Shares as of Oct 27, 2026| Category | Shares | % | Value | Status |
|---|---|---|---|---|
| Circulating | 336.49M | 100.0% | $9.94B | Estimated |
| Free float | - | - | - | Unavailable |
| Insider-held, unrestricted | - | - | - | Unavailable |
| Locked team funds | - | - | - | Unavailable |
| Other restricted (unlisted classes only) | - | - | - | Unavailable |
| Total outstanding | 336.49M | 100.0% | $9.94B | Verified |
| Ownership views (overlap the categories above, never added) | ||||
| Institutional holdings (13F) | 282.16M | 83.9% | $8.34B | Estimated |
| Insider-held, all (Forms 3, 4, 5) | - | - | - | Unavailable |
Institutional and insider holdings can include both tradable and locked shares, so they are shown for reference and never added to the total. Check: no class has more shares deducted than it has outstanding, and the review found no shares that may be counted twice: reconciles.
Valuation
- Traditional$9.94B
- Fully diluted$10.71B
- Circulating$9.94B
- Free float-
- Locked team value$0
- Other restricted value$0
Locked and restricted shares
Not reviewed yet.
Institutional holders
13F, quarter ended Jun 30, 2026| Holder | Shares | % of total |
|---|---|---|
| Berkshire Hathaway Inc | 124.81M | 37.09% |
| BlackRock, Inc. | 17.60M | 5.23% |
| DIMENSIONAL FUND ADVISORS LP | 10.51M | 3.12% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 9.08M | 2.70% |
| VANGUARD CAPITAL MANAGEMENT LLC | 8.39M | 2.49% |
| Kontiki Capital Management (HK) Ltd. | 6.08M | 1.81% |
| STATE STREET CORP | 5.99M | 1.78% |
| Boston Partners | 5.08M | 1.51% |
| Gates Capital Management, Inc. | 4.54M | 1.35% |
| GEODE CAPITAL MANAGEMENT, LLC | 3.90M | 1.16% |
Sum of long share positions in Form 13F reports for the quarter. 13F covers managers with over $100M in US equities; some positions are reported by more than one filer.
Insiders
Forms 3, 4 and 5Form 4 aggregation pending
Share classes
| Class | Listing | Shares outstanding | As of |
|---|---|---|---|
| Common stock | SIRI on Nasdaq | 336,486,715 | Oct 27, 2026 |
Notes and sources
- SIRIUS XM HOLDINGS INC. 10-Q for period ended 2026-09-30, Cover page (0000908937-26-000028)
- SEC public float (non-affiliates): $7.41B as of Jun 30, 2025, from the 10-K cover. It is a dollar value at a past date, not circulating supply.