The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
This stock page is the Follow view. The Build view lets your agent query BRK/A owners, fund changes, insider filings, and source links through REST or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/BRK.A"
Use Arkolith to show who owns BRK/A, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | FMR LLC | $12.2B | 17K | ▼−31% Reduced · −8K sh | Q1 2026 | |
| 2 | FIRST MANHATTAN CO. LLC. | $10.0B | 14K | ▼−0.8% Reduced · −108 sh | Q1 2026 | |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | $1.5B | 2K | ▲New +2K sh | Q1 2026 | |
| 4 | GARDNER RUSSO & QUINN LLC | $1.0B | 1K | ▼−1.9% Reduced · −28 sh | Q1 2026 | |
| 5 | MARKEL GROUP INC. | $800.0M | 1K | —Held | Q1 2026 | |
| 6 | Paralel Advisors LLC | $738.2M | 1K | —Held | Q1 2026 | |
| 7 | WELLCOME TRUST LTD (THE) as trustee of the WELLCOME TRUST | $502.7M | 700 | —Held | Q1 2026 | |
| 8 | S&G Foundation | $477.6M | 665 | ▲New +665 sh | Q1 2026 | |
| 9 | First Eagle Investment Management, LLC | $405.7M | 565 | ▲+2.2% Added · +12 sh | Q1 2026 | |
| 10 | Davis Asset Management, L.P. | $341.1M | 475 | ▲+296% Added · +355 sh | Q1 2026 | |
| 11 | Pathstone Holdings, LLC | $204.7M | 285 | ▲+1.8% Added · +5 sh | Q1 2026 | |
| 12 | STATE STREET CORP | $204.0M | 284 | ▼−18% Reduced · −62 sh | Q1 2026 | |
| 13 | WINTON GROUP Ltd | $155.8M | 217 | —Held | Q1 2026 | |
| 14 | Laird Norton Wetherby Trust Company, LLC | $109.2M | 152 | ▼−2.6% Reduced · −4 sh | Q1 2026 | |
| 15 | UMB Bank, n.a. | $104.1M | 145 | —Held | Q1 2026 | |
| 16 | BROWN BROTHERS HARRIMAN & CO | $98.4M | 137 | —Held | Q1 2026 | |
| 17 | ROYAL LONDON ASSET MANAGEMENT LTD | $91.9M | 129 | —Held | Q1 2026 | |
| 18 | Universal- Beteiligungs- und Servicegesellschaft mbH | $91.2M | 127 | ▼−2.3% Reduced · −3 sh | Q1 2026 | |
| 19 | Ruane, Cunniff & Goldfarb L.P. | $79.0M | 110 | ▼−4.3% Reduced · −5 sh | Q1 2026 | |
| 20 | Bank Pictet & Cie (Europe) AG | $63.9M | 89 | —Held | Q1 2026 | |
| 21 | ACR Alpine Capital Research, LLC | $61.0M | 85 | —Held | Q1 2026 | |
| 22 | CHOREO, LLC | $57.5M | 80 | —Held | Q1 2026 | |
| 23 | TIAA-CREF INDIVIDUAL & INSTITUTIONAL SERVICES, LLC | $55.3M | 77 | ▲New +77 sh | Q1 2026 | |
| 24 | EASTERN BANK | $54.6M | 76 | —Held | Q1 2026 | |
| 25 | Wilmington Savings Fund Society, FSB | $54.6M | 76 | ▲+2.7% Added · +2 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 |
|---|---|---|---|---|---|
| Mar 27, 2026 | Jain Ajit | Vice Chairman, Director | Gift (G) | 22 | — |
| Mar 17, 2026 | BUFFETT WARREN E | Chairman and CEO, Director, 10% Owner | Gift (G) | 2 | — |
| Mar 4, 2026 | Abel Gregory E. | See Remarks, Director | Buy (P) | 1 | $726K |
| Mar 4, 2026 | Abel Gregory E. | See Remarks, Director | Buy (P) | 1 | $726K |
| Mar 4, 2026 | Abel Gregory E. | See Remarks, Director | Buy (P) | 1 | $726K |
| Mar 4, 2026 | Abel Gregory E. | See Remarks, Director | Buy (P) | 1 | $727K |
| Mar 4, 2026 | Abel Gregory E. | See Remarks, Director | Buy (P) | 2 | $1.5M |
| Mar 4, 2026 | Abel Gregory E. | See Remarks, Director | Buy (P) | 1 | $727K |
| Mar 4, 2026 | Abel Gregory E. | See Remarks, Director | Buy (P) | 2 | $1.5M |
| Mar 4, 2026 | Abel Gregory E. | See Remarks, Director | Buy (P) | 1 | $729K |
| Mar 4, 2026 | Abel Gregory E. | See Remarks, Director | Buy (P) | 1 | $730K |
| Mar 4, 2026 | Abel Gregory E. | See Remarks, Director | Buy (P) | 1 | $731K |
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for BRK.A. 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.