SilverBox Corp IV (SBXD)
Pursues a business combination and proposed Parataxis Holdings transaction.
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Breakdown13F · 13D/G · Form 4
| Institutions45 holders · as of Mar 31, 2026 · largest filers plus last quarter's tail | ≈ 315.05% | 20.23M shares | |
| Adds to | 315.05% |
6.42M company shares as of Sep 3, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing
Two share counts disagree (6.42M in the company's Sep 3, 2026 report, 20.46M elsewhere); stakes use the report.
This quarter's institutional total failed a plausibility check; shown: the largest filers plus last quarter's remainder.
These groups come from separate filings that can overlap, so they add to 315.05%; nothing is left for Other.
This company has 2 share classes; every stake here is a share of the whole company.
Institutions13F, as of Mar 31, 2026
45 holders · 20.23M shares · 6 new positions · 17 increased · 8 reduced · 6 closed
| Holder | Shares | % of company | Chg q/q | Filed |
|---|---|---|---|---|
| Linden Advisors LP | 2.00M | 31.14% | 0 | May 15, 2026 |
| Mizuho Securities USA LLC | 1.80M | 27.98% | +151.3K | May 11, 2026 |
| Berkley W R Corp | 1.51M | 23.58% | +302.9K | May 15, 2026 |
| Polar Asset Management Partners Inc. | 1.51M | 23.48% | +128.0K | May 15, 2026 |
| AQR Arbitrage LLC | 1.34M | 20.79% | −11.6K | May 15, 2026 |
| Wolverine Asset Management LLC | 993.8K | 15.47% | +21.7K | May 4, 2026 |
| D. E. Shaw & Co., Inc. | 989.4K | 15.41% | 0 | May 15, 2026 |
| Mmcap International Inc. SPC | 980.0K | 15.26% | 0 | May 15, 2026 |
Ownership statements13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| SilverBox Sponsor IV LLC | 21.40% | 5.46M | 13G | Feb 13, 2025 ↗ |
| AQR Capital Management, LLCincl. AQR Arbitrage, LLC, AQR Capital Management Holdings, LLC | 11.13% | 2.28M | Sep 9, 2024 ↗ | |
| Healthcare of Ontario Pension Plan Trust Fund | 9.80% | 2.00M | 13G | Nov 13, 2024 ↗ |
| Sculptor Special Funding, LPincl. Sculptor Capital Management, Inc., Sculptor Capital LP +2 more | 9.68% | 1.98M | 13G | Sep 3, 2024 ↗ |
| Mizuho Financial Group, Inc. | 8.00% | 1.65M | 13G | Feb 12, 2026 ↗ |
| Berkley Insurance Companyincl. W. R. Berkley Corporation | 7.40% | 1.51M | 13G | May 8, 2026 ↗ |
| Polar Asset Management Partners Inc. | 7.20% | 1.48M | 13G | Aug 14, 2025 ↗ |
| Barclays PLC | 7.00% | 1.43M | 13G | May 14, 2026 ↗ |
| Ramya Rao | 6.36% | 1.30M | 13G | Feb 7, 2025 ↗ |
Insider tradesForm 4
Latest trades
Nothing filed in the last 12 months.
CongressHouse and Senate disclosures
Not reported.