Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in SIRI held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BERKSHIRE HATHAWAY INC | 124.8M | $3.69B | 0.0% | 37.077% | 1.23% |
| 2 | BlackRock, Inc. | 17.6M | $520.0M | +82.9% | 5.229% | 0.01% |
| 3 | DIMENSIONAL FUND ADVISORS LP | 10.5M | $310.5M | +66.8% | 3.123% | 0.06% |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | 9.1M | $268.3M | +4.3% | 2.698% | 0.01% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 8.4M | $247.7M | +1.0% | 2.491% | 0.01% |
| 6 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 6.9M | $204.1M | -0.6% | 2.052% | 0.02% |
| 7 | Kontiki Capital Management (HK) Ltd. | 6.1M | $179.7M | +6.8% | 1.807% | 11.78% |
| 8 | STATE STREET CORP | 6.0M | $177.0M | +68.9% | 1.780% | 0.00% |
| 9 | CITADEL ADVISORS LLC | 5.3M | $156.9M | +7.9% | 1.578% | 0.01% |
| 10 | Boston Partners | 5.1M | $150.2M | — | 1.509% | 0.13% |
| 11 | GOLDMAN SACHS GROUP INC | 4.8M | $142.0M | +19.2% | 1.428% | 0.01% |
| 12 | Gates Capital Management, Inc. | 4.5M | $134.1M | +65.5% | 1.349% | 3.22% |
| 13 | GEODE CAPITAL MANAGEMENT, LLC | 3.9M | $115.3M | +5.3% | 1.159% | 0.01% |
| 14 | AQR CAPITAL MANAGEMENT LLC | 3.4M | $98.4M | +13.6% | 1.009% | 0.03% |
| 15 | Bank of New York Mellon Corp | 3.0M | $89.0M | +38.3% | 0.895% | 0.01% |
| 16 | J. Goldman & Co LP | 3.0M | $88.2M | — | 0.887% | 2.28% |
| 17 | CHECK CAPITAL MANAGEMENT INC/CA | 2.9M | $86.5M | -0.5% | 0.870% | 0.77% |
| 18 | CANADA PENSION PLAN INVESTMENT BOARD | 2.4M | $69.9M | -38.8% | 0.703% | 0.04% |
| 19 | NORGES BANK | 2.1M | $61.8M | — | 0.621% | 0.01% |
| 20 | BARCLAYS PLC | 2.0M | $57.9M | +171.9% | 0.582% | 0.01% |
| 21 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.8M | $52.0M | +1.2% | 0.523% | 0.01% |
| 22 | JANE STREET GROUP, LLC | 1.7M | $50.6M | -6.2% | 0.508% | 0.00% |
| 23 | Squarepoint Ops LLC | 1.6M | $48.7M | +3565.7% | 0.490% | 0.05% |
| 24 | MORGAN STANLEY | 1.6M | $48.5M | -23.9% | 0.488% | 0.00% |
| 25 | HBK INVESTMENTS L P | 1.6M | $47.9M | -14.0% | 0.482% | 0.23% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in SIRI — a direct measure of their conviction.
Filings activity in SIRI during Q2 2026, grouped by how each filer changed its position.
Institutions that opened a new SIRI position in Q2 2026
Institutions that fully closed their SIRI position in Q2 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 611 | +8.3% | 88.18% | +7.60 pp | $8.47B | +41% |
| Q1 2026 | 564 | +11% | 80.58% | +0.77 pp | $6.02B | +16% |
| Q4 2025 | 508 | 3.8% | 79.81% | +1.37 pp | $5.18B | 13% |
| Q3 2025 | 528 | 0.6% | 78.44% | +3.59 pp | $5.95B | +6.5% |
| Q2 2025 | 531 | 1.1% | 74.85% | 0.81 pp | $5.59B | 0.2% |
| Q1 2025 | 537 | +2.1% | 75.66% | 2.52 pp | $5.60B | 3.7% |
| Q4 2024 | 526 | +10% | 78.18% | +0.75 pp | $5.81B | 0.7% |
| Q3 2024 | 477 | — | 77.43% | — | $5.86B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying SIRI stock.
Based on Q2 2026 13F filings, institutional ownership of Sirius XM Holdings Inc. stands at 88.2%, held across 611 reporting institutions.
BERKSHIRE HATHAWAY INC is the largest reported institutional holder of SIRI, with approximately 124,807,117 shares worth $3.69B as of Q2 2026.
Yes — 4 widely-followed marquee investors appear among the top 25 institutional holders of SIRI, including BERKSHIRE HATHAWAY INC, SUSQUEHANNA INTERNATIONAL GROUP, LLP, CITADEL ADVISORS LLC, JANE STREET GROUP, LLC.
Our composite Smart Money Score for SIRI is 79 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
101 institutions opened new positions in SIRI during Q2 2026, while 58 fully exited. 432 added to existing positions and 59 trimmed.
SIRI institutional ownership rose by 7.60 percentage points quarter-over-quarter, with a net change of +47 holders.
The top 10 institutions account for 69.7% of all reported 13F value in SIRI, and the top 25 account for 83.7%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Sirius XM Holdings Inc. (SIRI) Institutional Ownership