MCGA Yorkville Acquisition Corp. - Class A Ordinary Share
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Institutional owners (13F) 58 filers · $145.8M total · As of June 30, 2026
Institutions that report holding this stock in their quarterly SEC Form 13F. Long positions only; a single filer may appear twice for separate option legs. Large offsetting put/call legs typically reflect market-making or hedged inventory, not directional conviction.
| New positions | Exited positions | Increased | Decreased | Net shares change |
|---|---|---|---|---|
| 5 (-5 vs prior Q) | 2 (-3 vs prior Q) | 10 (-4 vs prior Q) | 12 (+3 vs prior Q) | +557K |
Compared to Q1 2026. SEC Form 13F filings are due within 45 days of quarter-end plus a short buffer for late filers — quarters still inside that window are skipped in favor of the most recent fully-reported pair.
| Institution | Value | Shares | % of tracked 13F | Type |
|---|---|---|---|---|
| BERKLEY W R CORP | $16,801,270 | 1,645,570 | 11.52% | Shares |
| MIZUHO SECURITIES USA LLC | $15,936,027 | 1,565,425 | 10.93% | Shares |
| Murchinson Ltd. | $10,214,084 | 1,000,400 | 7.00% | Shares |
| Davidson Kempner Capital Management LP | $8,678,500 | 850,000 | 5.95% | Shares |
| Crossingbridge Advisors, LLC | $8,678,500 | 850,000 | 5.95% | Shares |
| D. E. Shaw & Co., Inc. | $7,657,500 | 750,000 | 5.25% | Shares |
| Meteora Capital, LLC | $7,191,444 | 704,353 | 4.93% | Shares |
| BOOTHBAY FUND MANAGEMENT, LLC | $6,509,998 | 637,610 | 4.46% | Shares |
| DLD Asset Management, LP | $6,268,021 | 613,910 | 4.30% | Shares |
| Westchester Capital Management, LLC | $5,092,932 | 498,818 | 3.49% | Shares |
| BCK CAPITAL MANAGEMENT LP | $3,831,690 | 379,000 | 2.63% | Shares |
| Shaolin Capital Management LLC | $3,457,361 | 338,625 | 2.37% | Shares |
| MILLENNIUM MANAGEMENT LLC | $3,231,465 | 316,500 | 2.22% | Shares |
| First Trust Capital Management L.P. | $3,188,889 | 312,330 | 2.19% | Shares |
| AQR Arbitrage LLC | $3,016,994 | 295,494 | 2.07% | Shares |
| Radcliffe Capital Management, L.P. | $3,008,785 | 294,690 | 2.06% | Shares |
| Polar Asset Management Partners Inc. | $2,702,505 | 264,692 | 1.85% | Shares |
| Quarry LP | $2,573,992 | 252,105 | 1.77% | Shares |
| LMR Partners LLP | $2,115,594 | 207,208 | 1.45% | Shares |
| TENOR CAPITAL MANAGEMENT Co., L.P. | $2,042,000 | 200,000 | 1.40% | Shares |
| Linden Advisors LP | $2,042,000 | 200,000 | 1.40% | Shares |
| TORONTO DOMINION BANK | $2,012,605 | 197,121 | 1.38% | Shares |
| Magnetar Financial LLC | $1,990,950 | 195,000 | 1.37% | Shares |
| JANE STREET GROUP, LLC | $1,811,336 | 177,408 | 1.24% | Shares |
| Hudson Bay Capital Management LP | $1,531,500 | 150,000 | 1.05% | Shares |
| Periscope Capital Inc. | $1,276,250 | 125,000 | 0.88% | Shares |
| CITADEL ADVISORS LLC | $1,253,788 | 122,800 | 0.86% | Call option |
| BNP PARIBAS FINANCIAL MARKETS | $1,107,366 | 108,459 | 0.76% | Shares |
| Lineage Point Capital LP | $1,022,021 | 100,100 | 0.70% | Shares |
| Context Capital Management, LLC | $1,021,000 | 100,000 | 0.70% | Shares |
| WHITEBOX ADVISORS LLC | $1,021,000 | 100,000 | 0.70% | Shares |
| MOORE CAPITAL MANAGEMENT, LP | $1,021,000 | 100,000 | 0.70% | Shares |
| PICTON MAHONEY ASSET MANAGEMENT | $867,809 | 84,996 | 0.60% | Shares |
| CSS LLC/IL | $839,803 | 82,253 | 0.58% | Shares |
| JANE STREET GROUP, LLC | $787,191 | 77,100 | 0.54% | Call option |
| Jain Global LLC | $765,750 | 75,000 | 0.53% | Shares |
| Brevan Howard Capital Management LP | $612,900 | 60,000 | 0.42% | Shares |
| Maso Capital Partners Ltd | $533,000 | 50,000 | 0.37% | Shares |
| CITADEL ADVISORS LLC | $401,998 | 39,373 | 0.28% | Shares |
| JPMORGAN CHASE & CO | $305,483 | 29,920 | 0.21% | Shares |
| Schonfeld Strategic Advisors LLC | $305,258 | 29,898 | 0.21% | Shares |
| ATW SPAC MANAGEMENT LLC | $199,342 | 18,700 | 0.14% | Shares |
| K2 PRINCIPAL FUND, L.P. | $184,546 | 18,075 | 0.13% | Shares |
| ROBINSON CAPITAL MANAGEMENT, LLC | $155,192 | 15,200 | 0.11% | Shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $137,835 | 13,500 | 0.09% | Call option |
| Clear Street Group Inc. | $137,709 | 263,316 | 0.09% | Shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $126,686 | 12,408 | 0.09% | Shares |
| WOLVERINE ASSET MANAGEMENT LLC | $65,957 | 6,460 | 0.05% | Shares |
| HGC Investment Management Inc. | $39,329 | 3,852 | 0.03% | Shares |
| Rangeley Capital, LLC | $20,583 | 2,016 | 0.01% | Shares |
| GROUP ONE TRADING LLC | $15,315 | 1,500 | 0.01% | Shares |
| GLAZER CAPITAL, LLC | $2,687 | 263,158 | 0.00% | Shares |
| UBS Group AG | $2,256 | 221 | 0.00% | Shares |
| HRT FINANCIAL LP | $1,504 | 147,371 | 0.00% | Shares |
| Mint Tower Capital Management B.V. | $1,021 | 100,000 | 0.00% | Shares |
| SIMPLEX TRADING, LLC | $939 | 92 | 0.00% | Shares |
| MORGAN STANLEY | $633 | 62 | 0.00% | Shares |
| Virtu Financial LLC | $380 | 37,259 | 0.00% | Shares |
Company insiders 3 insiders · 1 officers · 1 directors
| Insider | Role | Last activity | Shares owned | Buys 12m | Sells 12m | Net 12m |
|---|---|---|---|---|---|---|
| Troy Rillo | Chief Financial Officer | Aug. 25, 2025 P | 91,770 | 1 | 0 | $91,770 |
| Mark Angelo | Director | June 30, 2025 P | 351,825 | 0 | 0 | $0 |
| Yorkville Acquisition Sponsor LLC | 10% owner | June 30, 2025 P | 351,825 | 0 | 0 | $0 |
Insiders from SEC Form 3/4/5 filings; net = open-market P/S only
Activists & 5%+ owners 1 position
Investors who filed SEC Schedule 13D — beneficial ownership above 5% with an intent to influence the issuer (activist stakes, board campaigns, M&A). Each row shows the most recent known state of that filer's position.
| Filer | Filed | Stake | Status | Purpose | Filing |
|---|---|---|---|---|---|
| Yorkville Acquisition Sponsor LLC, YA II PN, Ltd., YA Global Investments II (U.S.), LP, Yorkville Advisors Global, LP, Yorkville Advisors Global II, LLC, YAII GP, LP, YAII GP II, LLC, Mark Angelo, SC-Sigma Global Partners, LP | July 3, 2025 | 25.88% | Initial filing | Passive investment | SEC |
Purpose is an automated classification of the filer's own stated purpose (SEC Item 4) — not investment advice. "—" means no clear purpose was stated or the text could not be classified.