524 tracked 13F filers disclose a position in SIRI as of the latest SEC 13F filings, a combined $6.1B in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BERKSHIRE HATHAWAY INC | $2.9B | 124.8M | —Held | Q1 2026 | |
| 2 | BlackRock, Inc. | $222.1M | 9.6M | ▼−4.2% Reduced · −426K sh | Q1 2026 | |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | $200.9M | 8.7M | →First observed position No prior filed position | Q1 2026 | |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $191.6M | 8.3M | →First observed position No prior filed position | Q1 2026 | |
| 5 | DIMENSIONAL FUND ADVISORS LP | $145.4M | 6.3M | ▲+262% Added · +4.6M sh | Q1 2026 | |
| 6 | Kontiki Capital Management (HK) Ltd. | $179.7M | 6.1M | ▲+6.8% Added · +386K sh | Q2 2026 | |
| 7 | STATE STREET CORP | $177.0M | 6.0M | ▲+69% Added · +2.4M sh | Q2 2026 | |
| 8 | Gates Capital Management, Inc. | $134.1M | 4.5M | ▲+66% Added · +1.8M sh | Q2 2026 | |
| 9 | GOLDMAN SACHS GROUP INC | $90.3M | 3.9M | ▲+19% Added · +638K sh | Q1 2026 | |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | $115.3M | 3.9M | ▲+5.3% Added · +195K sh | Q2 2026 | |
| 11 | CANADA PENSION PLAN INVESTMENT BOARD | $89.1M | 3.9M | ▲+106% Added · +2.0M sh | Q1 2026 | |
| 12 | CITADEL ADVISORS LLC | $75.3M | 3.3M | ▲+313% Added · +2.5M sh | Q1 2026 | |
| 13 | AQR CAPITAL MANAGEMENT LLC | $68.3M | 3.0M | ▲+106% Added · +1.5M sh | Q1 2026 | |
| 14 | CHECK CAPITAL MANAGEMENT INC/CA | $67.9M | 2.9M | ▲+2.0% Added · +59K sh | Q1 2026 | |
| 15 | NORGES BANK | $57.1M | 2.9M | ▲+52% Added · +978K sh | Q4 2025 | |
| 16 | AMERIPRISE FINANCIAL INC | $55.7M | 2.4M | ▲+1.6% Added · +39K sh | Q1 2026 | |
| 17 | Bank of New York Mellon Corp | $50.3M | 2.2M | ▲+7.8% Added · +158K sh | Q1 2026 | |
| 18 | MORGAN STANLEY | $49.8M | 2.2M | ▲+26% Added · +445K sh | Q1 2026 | |
| 19 | HSBC HOLDINGS PLC | $41.6M | 1.8M | ▼−14% Reduced · −281K sh | Q1 2026 | |
| 20 | TWO SIGMA INVESTMENTS, LP | $41.0M | 1.8M | ▼−29% Reduced · −742K sh | Q1 2026 | |
| 21 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $40.2M | 1.7M | ▲+6.9% Added · +113K sh | Q1 2026 | |
| 22 | Tidal Investments LLC | $45.0M | 1.5M | ▲+26% Added · +316K sh | Q2 2026 | |
| 23 | Gotham Asset Management, LLC | $28.6M | 1.2M | ▲+47% Added · +395K sh | Q1 2026 | |
| 24 | PRIVATE MANAGEMENT GROUP INC | $36.5M | 1.2M | ▼−8.7% Reduced · −118K sh | Q2 2026 | |
| 25 | WEITZ INVESTMENT MANAGEMENT, INC. | $35.1M | 1.2M | ▼−8.1% Reduced · −105K sh | Q2 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
Last quarter, 3 funds opened a new position in SIRI and 22 added to an existing one, while 19 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 306 funds | $228.5B |
| NVIDIA CORPNVDA | 298 funds | $340.0B |
| AMAZON.COM INCAMZN | 297 funds | $172.6B |
| APPLE INCAAPL | 293 funds | $317.2B |
| META PLATFORMS INC-CLASS AMETA | 291 funds | $95.0B |
| ALPHABET INC-CL AGOOGL | 290 funds | $152.8B |
| BROADCOM INCAVGO | 288 funds | $133.6B |
| JPMORGAN CHASE & COJPM | 285 funds | $54.3B |
| ALPHABET INC-CL CGOOG | 284 funds | $111.2B |
| VISA INC-CLASS A SHARESV | 284 funds | $55.1B |
| CHEVRON CORPCVX | 281 funds | $43.7B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 278 funds | $34.9B |
Ranked by how many of SIRI's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 4, 2025 | BUFFETT WARREN E | 10% Owner | Buy (P) | 1.0M | $22.4M |
| Aug 1, 2025 | BUFFETT WARREN E | 10% Owner | Buy (P) | 1.9M | $40.6M |
| Jul 31, 2025 | BUFFETT WARREN E | 10% Owner | Buy (P) | 85K | $1.8M |
| Jul 31, 2025 | BUFFETT WARREN E | 10% Owner | Buy (P) | 2.0M | $41.6M |
| Feb 3, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy (P) | 433K | $10.2M |
| Feb 3, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy (P) | 284K | $6.8M |
| Jan 31, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy (P) | 840K | $19.8M |
| Jan 30, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy (P) | 751K | $17.1M |
| Dec 19, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy (P) | 31K | $674K |
| Dec 19, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy (P) | 2.0M | $42.5M |
| Dec 18, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy (P) | 916K | $20.1M |
| Dec 18, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy (P) | 539K | $12.1M |
Connected entities for SIRI
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/SIRI/capital-change-brief"
Use Arkolith's capital_change_brief for SIRI. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for SIRI. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.