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 BIRK 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/BIRK"
Use Arkolith to show who owns BIRK, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | $92.3M | 2.6M | ▲New +2.6M sh | Q1 2026 | |
| 2 | WESTFIELD CAPITAL MANAGEMENT CO LP | $83.8M | 2.3M | ▲+20% Added · +384K sh | Q1 2026 | |
| 3 | Point72 Asset Management, L.P. | $68.2M | 1.9M | ▼−32% Reduced · −899K sh | Q1 2026 | |
| 4 | Anomaly Capital Management, LP | $50.7M | 1.4M | ▲New +1.4M sh | Q1 2026 | |
| 5 | Freestone Grove Partners LP | $31.0M | 865K | ▲New +865K sh | Q1 2026 | |
| 6 | CITADEL ADVISORS LLC | $28.6M | 799K | ▲+313% Added · +606K sh | Q1 2026 | |
| 7 | RICE HALL JAMES & ASSOCIATES, LLC | $21.2M | 590K | ▲+27% Added · +124K sh | Q1 2026 | |
| 8 | STATE STREET CORP | $20.2M | 563K | ▼−3.1% Reduced · −18K sh | Q1 2026 | |
| 9 | Woodline Partners LP | $12.2M | 339K | ▲+23% Added · +63K sh | Q1 2026 | |
| 10 | Verition Fund Management LLC | $7.5M | 209K | ▼−46% Reduced · −175K sh | Q1 2026 | |
| 11 | CULLEN/FROST BANKERS, INC. | $7.2M | 201K | ▼−6.4% Reduced · −14K sh | Q1 2026 | |
| 12 | BOOTHBAY FUND MANAGEMENT, LLC | $6.7M | 186K | ▲+5.5% Added · +10K sh | Q1 2026 | |
| 13 | Unisphere Establishment | $5.1M | 142K | ▼−48% Reduced · −129K sh | Q1 2026 | |
| 14 | BW Gestao de Investimentos Ltda. | $5.0M | 139K | ▼−67% Reduced · −286K sh | Q1 2026 | |
| 15 | ABN AMRO INVESTMENT SOLUTIONS | $2.9M | 81K | ▲New +81K sh | Q1 2026 | |
| 16 | LOS ANGELES CAPITAL MANAGEMENT LLC | $2.8M | 77K | ▼−38% Reduced · −47K sh | Q1 2026 | |
| 17 | Polar Asset Management Partners Inc. | $2.6M | 73K | ▲New +73K sh | Q1 2026 | |
| 18 | VANGUARD PORTFOLIO MANAGEMENT LLC | $2.1M | 59K | ▲New +59K sh | Q1 2026 | |
| 19 | Entropy Technologies, LP | $1.1M | 30K | ▲New +30K sh | Q1 2026 | |
| 20 | Giverny Capital Inc. | $981K | 27K | —Held | Q1 2026 | |
| 21 | Venturi Wealth Management, LLC | $677K | 19K | ▼−9.6% Reduced · −2K sh | Q1 2026 | |
| 22 | Man Group plc | $642K | 18K | ▲New +18K sh | Q1 2026 | |
| 23 | Illinois Municipal Retirement Fund | $621K | 17K | ▼−52% Reduced · −19K sh | Q1 2026 | |
| 24 | Marex Group plc | $544K | 15K | ▲+56% Added · +5K sh | Q1 2026 | |
| 25 | Vontobel Holding Ltd. | $513K | 14K | ▲+38% Added · +4K 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.
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 78 funds | $29.0B |
| VISA INC-CLASS A SHARESV | 76 funds | $7.3B |
| NVIDIA CORPNVDA | 75 funds | $42.4B |
| AMAZON.COM INCAMZN | 75 funds | $25.2B |
| ALPHABET INC-CL AGOOGL | 75 funds | $20.8B |
| META PLATFORMS INC-CLASS AMETA | 75 funds | $13.8B |
| ELI LILLY & COLLY | 75 funds | $8.2B |
| APPLE INCAAPL | 74 funds | $34.0B |
| BOSTON SCIENTIFIC CORPBSX | 72 funds | $2.6B |
| SPOTIFY TECHNOLOGY SASPOT | 72 funds | $1.9B |
| BROADCOM INCAVGO | 71 funds | $15.7B |
| JPMORGAN CHASE & COJPM | 71 funds | $11.0B |
Ranked by how many of BIRK's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
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 BIRK. 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.