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/B 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.B"
Use Arkolith to show who owns BRK/B, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $79.0B | 157.1M | ▲+1.8% Added · +2.8M sh | Q4 2025 | |
| 2 | BlackRock, Inc. | $58.1B | 121.2M | ▲~0% Added · +14K sh | Q1 2026 | |
| 3 | STATE STREET CORP | $35.5B | 74.1M | ▲+0.2% Added · +174K sh | Q1 2026 | |
| 4 | GEODE CAPITAL MANAGEMENT, LLC | $19.7B | 41.2M | ▲+2.8% Added · +1.1M sh | Q1 2026 | |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | $11.4B | 23.7M | ▲New +23.7M sh | Q1 2026 | |
| 6 | GATES FOUNDATION TRUST | $8.2B | 17.0M | ▼−12% Reduced · −2.4M sh | Q1 2026 | |
| 7 | FMR LLC | $7.2B | 15.0M | ▲+58% Added · +5.5M sh | Q1 2026 | |
| 8 | VANGUARD FIDUCIARY TRUST CO | $4.9B | 10.2M | ▲New +10.2M sh | Q1 2026 | |
| 9 | H&H International Investment, LLC | $4.4B | 9.1M | ▲+27% Added · +2.0M sh | Q1 2026 | |
| 10 | FLOSSBACH VON STORCH SE | $1.2B | 2.6M | ▼−5.6% Reduced · −154K sh | Q1 2026 | |
| 11 | FIRST MANHATTAN CO. LLC. | $864.3M | 1.8M | ▼−2.7% Reduced · −51K sh | Q1 2026 | |
| 12 | STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM | $760.4M | 1.6M | ▼−1.4% Reduced · −23K sh | Q1 2026 | |
| 13 | MARKEL GROUP INC. | $734.1M | 1.5M | —Held | Q1 2026 | |
| 14 | Rothschild & Co Wealth Management UK Ltd | $702.8M | 1.5M | ▼−0.7% Reduced · −11K sh | Q1 2026 | |
| 15 | Chevy Chase Trust Holdings, LLC | $640.6M | 1.3M | ▼−2.6% Reduced · −36K sh | Q1 2026 | |
| 16 | DIAMOND HILL CAPITAL MANAGEMENT INC | $609.7M | 1.3M | ▼−17% Reduced · −257K sh | Q1 2026 | |
| 17 | CITADEL ADVISORS LLC | $571.9M | 1.2M | ▲+14% Added · +147K sh | Q1 2026 | |
| 18 | AVIVA PLC | $546.4M | 1.1M | ▲+1.4% Added · +16K sh | Q1 2026 | |
| 19 | BROWN BROTHERS HARRIMAN & CO | $545.6M | 1.1M | ▲+1.3% Added · +15K sh | Q1 2026 | |
| 20 | GARDNER RUSSO & QUINN LLC | $532.1M | 1.1M | ▼−1.3% Reduced · −15K sh | Q1 2026 | |
| 21 | LONDON CO OF VIRGINIA | $518.6M | 1.1M | ▲+8.6% Added · +86K sh | Q1 2026 | |
| 22 | Mesirow Financial Investment Management, Inc. | $468.0M | 977K | ▲+20% Added · +164K sh | Q1 2026 | |
| 23 | WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | $465.6M | 993K | ▼−8.1% Reduced · −88K sh | Q1 2026 | |
| 24 | ROYAL LONDON ASSET MANAGEMENT LTD | $457.4M | 955K | ▲+1.4% Added · +14K sh | Q1 2026 | |
| 25 | Universal- Beteiligungs- und Servicegesellschaft mbH | $430.2M | 903K | ▼−0.1% Reduced · −1K 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.
No Form 4 insider transactions on file yet.
No filings captured for this ticker in the live stream yet.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for BRK.B. 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.