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.
| # | 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 | ▲New +8.7M sh | Q1 2026 | |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $191.6M | 8.3M | ▲New +8.3M sh | Q1 2026 | |
| 5 | DIMENSIONAL FUND ADVISORS LP | $145.4M | 6.3M | ▲+262% Added · +4.6M sh | Q1 2026 | |
| 6 | Kontiki Capital Management (HK) Ltd. | $131.5M | 5.7M | ▼−4.5% Reduced · −271K sh | Q1 2026 | |
| 7 | GOLDMAN SACHS GROUP INC | $90.3M | 3.9M | ▲+19% Added · +638K sh | Q1 2026 | |
| 8 | CANADA PENSION PLAN INVESTMENT BOARD | $89.1M | 3.9M | ▲+106% Added · +2.0M sh | Q1 2026 | |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | $85.6M | 3.7M | ▲+0.5% Added · +18K sh | Q1 2026 | |
| 10 | STATE STREET CORP | $81.9M | 3.5M | ▲+1.7% Added · +60K sh | Q1 2026 | |
| 11 | CITADEL ADVISORS LLC | $75.3M | 3.3M | ▲+313% Added · +2.5M sh | Q1 2026 | |
| 12 | AQR CAPITAL MANAGEMENT LLC | $68.3M | 3.0M | ▲+106% Added · +1.5M sh | Q1 2026 | |
| 13 | CHECK CAPITAL MANAGEMENT INC/CA | $67.9M | 2.9M | ▲+2.0% Added · +59K sh | Q1 2026 | |
| 14 | NORGES BANK | $57.1M | 2.9M | ▲+52% Added · +978K sh | Q4 2025 | |
| 15 | Gates Capital Management, Inc. | $63.3M | 2.7M | ▲New +2.7M sh | Q1 2026 | |
| 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 | SEIZERT CAPITAL PARTNERS, LLC | $42.5M | 1.8M | ▼−3.1% Reduced · −59K sh | Q1 2026 | |
| 20 | HSBC HOLDINGS PLC | $41.6M | 1.8M | ▼−14% Reduced · −281K sh | Q1 2026 | |
| 21 | TWO SIGMA INVESTMENTS, LP | $41.0M | 1.8M | ▼−29% Reduced · −742K sh | Q1 2026 | |
| 22 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $40.2M | 1.7M | ▲+6.9% Added · +113K sh | Q1 2026 | |
| 23 | PRIVATE MANAGEMENT GROUP INC | $31.2M | 1.4M | ▲+0.5% Added · +6K sh | Q1 2026 | |
| 24 | Gotham Asset Management, LLC | $28.6M | 1.2M | ▲+47% Added · +395K sh | Q1 2026 | |
| 25 | Tidal Investments LLC | $27.9M | 1.2M | ▼−2.0% Reduced · −25K sh | Q1 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.
| 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 |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 155 funds | $58.1B |
| AMAZON.COM INCAMZN | 153 funds | $47.3B |
| BROADCOM INCAVGO | 152 funds | $29.6B |
| META PLATFORMS INC-CLASS AMETA | 152 funds | $25.9B |
| NVIDIA CORPNVDA | 151 funds | $83.1B |
| ALPHABET INC-CL AGOOGL | 151 funds | $54.0B |
| COSTCO WHOLESALE CORPCOST | 151 funds | $10.2B |
| BANK OF AMERICA CORPBAC | 150 funds | $31.0B |
| VISA INC-CLASS A SHARESV | 150 funds | $12.4B |
| NETFLIX INCNFLX | 150 funds | $7.1B |
| APPLE INCAAPL | 149 funds | $128.8B |
| CAPITAL ONE FINANCIAL CORPCOF | 149 funds | $4.6B |
Ranked by how many of SIRI's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
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. Every panel above is one call to the Arkolith API & MCP server.