36 tracked 13F filers disclose a position in BLRK as of the latest SEC 13F filings, a combined $109.4M 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 | Magnetar Financial LLC | $7.9M | 800K | ▲New +800K sh | Q1 2026 | |
| 2 | LINDEN ADVISORS LP | $7.4M | 750K | ▲New +750K sh | Q1 2026 | |
| 3 | AQR Arbitrage LLC | $7.3M | 740K | ▲New +740K sh | Q1 2026 | |
| 4 | ARISTEIA CAPITAL, L.L.C. | $5.1M | 511K | ▲New +511K sh | Q1 2026 | |
| 5 | Alberta Investment Management Corp | $5.0M | 500K | —Held | Q1 2026 | |
| 6 | PICTON MAHONEY ASSET MANAGEMENT | $5.0M | 500K | ▲New +500K sh | Q1 2026 | |
| 7 | Polar Asset Management Partners Inc. | $5.0M | 500K | —Held | Q1 2026 | |
| 8 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | $5.0M | 500K | ▲New +500K sh | Q1 2026 | |
| 9 | BNP PARIBAS FINANCIAL MARKETS | $4.6M | 466K | ▲New +466K sh | Q1 2026 | |
| 10 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $4.5M | 450K | ▲New +450K sh | Q1 2026 | |
| 11 | Wealthspring Capital LLC | $4.2M | 419K | ▼−2.6% Reduced · −11K sh | Q2 2026 | |
| 12 | Radcliffe Capital Management, L.P. | $4.0M | 400K | —Held | Q1 2026 | |
| 13 | TENOR CAPITAL MANAGEMENT Co., L.P. | $4.0M | 400K | —Held | Q1 2026 | |
| 14 | Verition Fund Management LLC | $3.5M | 350K | ▲New +350K sh | Q1 2026 | |
| 15 | L1 Global Manager Pty Ltd | $3.5M | 350K | —Held | Q1 2026 | |
| 16 | Hudson Bay Capital Management LP | $3.5M | 350K | ▼~0% Reduced · −2 sh | Q1 2026 | |
| 17 | First Trust Capital Management L.P. | $3.3M | 333K | ▼~0% Reduced · −3 sh | Q1 2026 | |
| 18 | COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | $3.0M | 300K | ▲New +300K sh | Q1 2026 | |
| 19 | RIVERNORTH CAPITAL MANAGEMENT, LLC | $3.0M | 300K | ▲New +300K sh | Q1 2026 | |
| 20 | TWO SIGMA INVESTMENTS, LP | $2.7M | 272K | —Held | Q1 2026 | |
| 21 | METEORA CAPITAL, LLC | $2.6M | 261K | ▲New +261K sh | Q1 2026 | |
| 22 | Context Capital Management, LLC | $2.5M | 250K | —Held | Q2 2026 | |
| 23 | Shaolin Capital Management LLC | $2.5M | 250K | ▲New +250K sh | Q1 2026 | |
| 24 | WHITEBOX ADVISORS LLC | $2.2M | 219K | —Held | Q1 2026 | |
| 25 | Clear Street Group Inc. | $1.9M | 193K | ▲New +193K 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.
Last quarter, 14 funds opened a new position in BLRK, while 4 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 |
|---|---|---|
| CRANE HARBOR ACQUISITIO-CL ACRAN | 27 funds | $185.0M |
| REPUBLIC DIGITAL ACQUIS-CL ARDAG | 26 funds | $147.5M |
| TRAILBLAZER ACQUISITION-CL ABLZR | 26 funds | $137.2M |
| ITHAX ACQUISITION CORP-CL AITHA | 26 funds | $125.3M |
| EQV VENTURES ACQUISITION C-AEVAC | 25 funds | $217.3M |
| M3-BRIGADE ACQUISITION-CL AMBVI | 25 funds | $173.2M |
| MESHFLOW ACQUISITION CO-CL AMESH | 25 funds | $152.9M |
| CANTOR EQUITY PARTNERS-CL ACEPF | 25 funds | $148.6M |
| SIZZLE ACQUISITION CORP-CL ASZZL | 25 funds | $141.0M |
| OYSTER ENTERPRISES II ACQ-AOYSE | 25 funds | $139.8M |
| HIGHVIEW MERGER CORP-CL AHVMC | 25 funds | $131.4M |
| EVOLUTION GLOBAL ACQUIS-CL AEVOX | 25 funds | $124.4M |
Ranked by how many of BLRK's institutional holders also hold each name, a cross-fund conviction signal.
No open-market insider transactions on file yet. Grants, gifts, and exercises live on the full insider page.
| Class | 13F holders | Value held |
|---|---|---|
| BLRKthis pageUSD CL A ORD SHS | 36 funds | $109.4M |
| BLRKWWarrant | 30 funds | $1.2M |
| BLRKUUnit | 18 funds | $22.1M |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for BLRK
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/BLRK/capital-change-brief"
Use Arkolith's capital_change_brief for BLRK. 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 BLRK. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.