18 institutions reported holding $25.2M of M3-BRIGADE ACQUISITION VI CO (MBVIU) in SEC 13F filings for 2026-06-30. Largest institutional holders: HGC Investment Management Inc. ($6.4M), TORONTO DOMINION BANK ($6.0M), LMR Partners LLP ($2.6M), READYSTATE ASSET MANAGEMENT LP ($2.3M), SYQUANT CAPITAL SAS ($2.0M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | HGC Investment Management Inc. | $6.4M | 625,000 | Hold |
| 2 | TORONTO DOMINION BANK | $6.0M | 584,608 | Added |
| 3 | LMR Partners LLP | $2.6M | 250,000 | Hold |
| 4 | READYSTATE ASSET MANAGEMENT LP | $2.3M | 225,000 | Hold |
| 5 | SYQUANT CAPITAL SAS | $2.0M | 200,000 | Hold |
| 6 | Clear Street Group Inc. | $1.3M | 129,549 | Added |
| 7 | Walleye Capital LLC | $1.0M | 100,000 | Hold |
| 8 | JPMORGAN CHASE & CO | $1.0M | 100,000 | Hold |
| 9 | CITIGROUP INC | $933,300 | 90,000 | Hold |
| 10 | Quarry LP | $513,100 | 50,000 | Hold |
| 11 | Westchester Capital Management, LLC | $512,500 | 50,000 | Hold |
| 12 | SONA ASSET MANAGEMENT (US) LLC | $256,250 | 25,000 | Hold |
| 13 | Calamos Advisors LLC | $255,164 | 24,606 | Hold |
| 14 | FNY Investment Advisers, LLC | $54,000 | 5,288 | New |
| 15 | Rangeley Capital, LLC | $30,002 | 2,927 | New |
| 16 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | $20 | 2 | Hold |
| 17 | Magnetar Financial LLC | $0 | 0 | Exited |
| 18 | Bulldog Investors, LLP | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30