Comparable stake leader
SilverBox Sponsor IV LLC
SEC ownership of SilverBox Corp IV
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0002015947.
Disclosed value leader
SilverBox Sponsor IV LLC
Comparable rows
48/50
Latest evidence
31 Mar 2026
- Public ticker
- SBXD, SBXD-UN, SBXD-WT on NYSE
- Parsed ownership sources
-
13D/G and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
SilverBox Sponsor IV LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
48 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
SilverBox Sponsor IV LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0002015947
- Issuer location
- Austin, TX
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of SilverBox Corp IV (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
SilverBox Sponsor IV LLC
Disclosed value leader
SilverBox Sponsor IV LLC
Comparable rows
48/50
Latest evidence
31 Mar 2026
13D/G
13F
Lead comparable stake: 21%
2 rows are not safely comparable across share classes.
13D/G row: SilverBox Sponsor IV LLC
Showing 1-8 of 50 holder rows.
Quick read
SilverBox Sponsor IV LLC leads the comparable SEC ownership view at 21%.
48 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens SilverBox Sponsor IV LLC's linked filing trail.
Comparable ownership
Top 5
SilverBox Sponsor IV LLC
21%
MIZUHO FINANCIAL GROUP INC
8%
BERKLEY W R CORP
7.4%
Polar Asset Management Partners Inc.
7.2%
BARCLAYS PLC
7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| SilverBox Sponsor IV LLC |
13D/G
|
21%
|
$56,131,950
5,455,000 shares
|
$0 | 31 Dec 2024 |
| MIZUHO FINANCIAL GROUP INC |
13D/G
|
8%
|
$17,411,220
1,645,673 shares
|
$0 | 31 Dec 2025 |
| BERKLEY W R CORP |
13F
13D/G
Company · W. R. Berkley Corporation
|
7.4%
from 13D/G
|
$16,205,931
1,514,573 shares
|
— | 31 Mar 2026 |
| Polar Asset Management Partners Inc. |
13D/G
13F
Company
|
7.2%
|
$16,894,496
1,480,000 shares
|
$0 | 30 Jun 2025 |
| BARCLAYS PLC |
13D/G
|
7%
|
$15,320,795
1,431,850 shares
|
+$4,931,876 | 31 Mar 2026 |
| AQR CAPITAL MANAGEMENT LLC |
13D/G
|
6.6%
|
$14,547,622
1,347,002 shares
|
-$2,299,946 | 30 Jun 2025 |
| GOLDMAN SACHS GROUP INC |
13D/G
13F
THE GOLDMAN SACHS GROUP, INC. · Company
|
3.2%
|
$6,847,610
654,022 shares
|
-$9,976,936 | 30 Sep 2025 |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC |
13D/G
13F
Company
|
1.4%
|
$2,931,600
280,000 shares
|
-$9,933,936 | 30 Sep 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 16 Jun 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-9 of 9 reporting-owner rows connected to SilverBox Corp IV. Open a relationship link for the CIK-to-CIK filing trail.
Rows
9
Largest Forms 3/4/5 holder
Jonathan M. Lewis
Net 12M change
$0
Latest report
25 Jun 2025
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Jonathan M. Lewis | Director | Mixed | 15 Aug 2024 | |||
| SilverBox Sponsor IV LLC | 10%+ Owner | Mixed | 15 Aug 2024 | |||
| Matthew R. Eilers | Director | Mixed | 15 Aug 2024 | |||
| Reed J. Seaton | Director | Mixed | 23 Sep 2024 | |||
| Daniel E. Esters | Chief Financial Officer, Director | Mixed | 15 Aug 2024 | |||
| David H. Lee | General Counsel | Mixed | 15 Aug 2024 | |||
| Duncan D. Murdoch | Chief Investment Officer | Mixed | 15 Aug 2024 | |||
| Jin Chun | Chief Operating Officer | Mixed | 15 Aug 2024 | |||
| Glenn P. Marino | Director | Mixed | 25 Jun 2025 |
Recent insider transactions for SilverBox Corp IV
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.