18 tracked 13F filers disclose a position in BLRKU as of the latest SEC 13F filings, a combined $22.1M 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 | MILLENNIUM MANAGEMENT LLC | $6.0M | 600K | —Held | Q1 2026 | |
| 2 | LMR Partners LLP | $4.0M | 400K | —Held | Q1 2026 | |
| 3 | Westchester Capital Management, LLC | $2.5M | 250K | —Held | Q1 2026 | |
| 4 | TORONTO DOMINION BANK | $2.4M | 236K | ▼−6.2% Reduced · −16K sh | Q1 2026 | |
| 5 | Quarry LP | $2.3M | 225K | —Held | Q1 2026 | |
| 6 | Ghisallo Capital Management LLC | $1.0M | 100K | —Held | Q1 2026 | |
| 7 | Cable Car Capital, LP | $1.0M | 100K | —Held | Q1 2026 | |
| 8 | TIG Advisors, LLC | $1.0M | 100K | —Held | Q1 2026 | |
| 9 | JPMORGAN CHASE & CO | $502K | 50K | —Held | Q1 2026 | |
| 10 | CANTOR FITZGERALD, L. P. | $349K | 35K | ▼−0.6% Reduced · −200 sh | Q1 2026 | |
| 11 | BlueCrest Capital Management Ltd | $251K | 25K | —Held | Q1 2026 | |
| 12 | PRELUDE CAPITAL MANAGEMENT, LLC | $251K | 25K | —Held | Q1 2026 | |
| 13 | Stoic Point Capital Management LLC | $250K | 25K | —Held | Q1 2026 | |
| 14 | BOOTHBAY FUND MANAGEMENT, LLC | $224K | 22K | —Held | Q1 2026 | |
| 15 | Clear Street Group Inc. | $61K | 6K | ▼−97% Reduced · −194K sh | Q1 2026 | |
| 16 | OSAIC HOLDINGS, INC. | $6K | 550 | ▲New +550 sh | Q1 2026 | |
| 17 | Magnetar Financial LLC | $80 | 8 | ▼−100% Reduced · −800K sh | Q1 2026 | |
| 18 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | $20 | 2 | ▼−100% Reduced · −500K 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, 0 funds opened a new position in BLRKU, while 1 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 |
|---|---|---|
| CANTOR EQUITY PARTNERS-CL ACEPV | 22 funds | $69.4M |
| ACTIVATE ENERGY ACQUISITIONAEAQU | 22 funds | $18.7M |
| MESHFLOW ACQUISITION CORPMESHU | 22 funds | $16.2M |
| M3-BRIGADE ACQUISITION-CL AMBVI | 21 funds | $108.6M |
| DAEDALUS SPECIAL ACQUISITIONDSACU | 21 funds | $15.7M |
| HCM IV ACQUISITION CORPHACQU | 20 funds | $111.0M |
| D. BORAL ARC ACQUISIT - CL ABCAR | 20 funds | $87.3M |
| ITHAX ACQUISITION CORP IIIITHAU | 20 funds | $8.1M |
| DRUGS MADE IN AMERICA ACQUISDMII | 19 funds | $152.5M |
| IDEA ACQUISITION CORPIACOU | 19 funds | $110.6M |
| BLUE WATER ACQUISITION C-ABLUW | 19 funds | $92.3M |
| CANTOR EQUITY PARTNERS-CL ACEPF | 19 funds | $90.4M |
Ranked by how many of BLRKU'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 |
|---|---|---|
| BLRKUSD CL A ORD SHS | 36 funds | $109.4M |
| BLRKWWarrant | 30 funds | $1.2M |
| BLRKUthis pageUnit | 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.
No filings captured for this ticker in the live stream yet.
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/BLRKU/capital-change-brief"
Use Arkolith's capital_change_brief for BLRKU. 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 BLRKU. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.