Comparable stake leader
BERKLEY W R CORP
SEC ownership of Ribbon Acquisition Corp.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0002035016.
Disclosed value leader
RIVERNORTH CAPITAL MANAGEMENT, LLC
Comparable rows
15/31
Latest evidence
31 Mar 2026
- Symbol
- RIBB, RIBBR, RIBBU on Nasdaq
- SEC evidence covered
- 13F, 13D/G, and 3/4/5
- Largest SEC-reported holder
- BERKLEY W R CORP
- Latest 13D/G holder
- BERKLEY W R CORP
- Latest parsed evidence date
- 31 Mar 2026
- CIK
- 0002035016
- Location
- Tokyo, Japan
Ownership snapshot
2 signals
Issuer
2 identity fields
Ownership snapshot
Top shareholders of Ribbon Acquisition Corp. (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
BERKLEY W R CORP
Disclosed value leader
RIVERNORTH CAPITAL MANAGE...
Comparable rows
15/31
Latest evidence
31 Mar 2026
13F
13D/G
3/4/5
Lead comparable stake: 7.9%
16 rows are not safely comparable across share classes.
13D/G row: BERKLEY W R CORP
Showing 1-8 of 31 holder rows.
Quick read
BERKLEY W R CORP leads the comparable SEC ownership view at 7.9%.
15 of 31 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.
Comparable ownership
Top 5
BERKLEY W R CORP
7.9%
Westchester Capital Management, LLC
7.8%
RIVERNORTH CAPITAL MANAGEMENT, LLC
7.7%
WOLVERINE ASSET MANAGEMENT LLC
6.4%
Feis Equities LLC
5.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 31 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BERKLEY W R CORP |
13F
13D/G
Company · W. R. Berkley Corporation
|
7.9%
from 13D/G
|
$3,130,972
333,313 shares
mixed-class rows
|
— | 31 Mar 2026 |
| Westchester Capital Management, LLC |
13F
13D/G
Company
|
7.8%
from 13D/G
|
$3,941,450
375,734 shares
|
— | 31 Mar 2026 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC |
13D/G
13F
Company
|
7.7%
|
$4,304,000
400,000 shares
|
$0 | 31 Dec 2025 |
| WOLVERINE ASSET MANAGEMENT LLC |
13D/G
13F
Company
|
6.4%
|
$4,101,051
410,927 shares
|
$0 | 31 Mar 2025 |
| Feis Equities LLC |
13D/G
|
5.3%
|
$2,790,804
266,293 shares
|
$0 | 11 Feb 2026 |
| Hudson Bay Capital Management LP |
13F
13D/G
Company
|
5.2%
from 13D/G
|
$2,670,796
495,998 shares
mixed-class rows
|
— | 31 Mar 2026 |
| Polar Asset Management Partners Inc. |
13D/G
13F
Company
|
2.1%
|
$1,045,090
100,000 shares
|
$0 | 31 Mar 2026 |
| MIZUHO FINANCIAL GROUP INC |
13D/G
|
0.2%
|
—
12,398 shares
|
$0 | 31 Dec 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 02 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 1-6 of 6 reporting-owner rows connected to Ribbon Acquisition Corp.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
6
Largest Forms 3/4/5 holder
Zhiyang Zhou
Net 12M change
$0
Latest report
14 Jan 2025
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Zhiyang Zhou | Chief Financial Officer | Mixed | 14 Jan 2025 | |||
| James Zhang | Director | Mixed | 14 Jan 2025 | |||
| Jon Nathan Miller | Director | Mixed | 14 Jan 2025 | |||
| Kani Chen | Director | Mixed | 14 Jan 2025 | |||
| Ribbon Investment Co Ltd | 10%+ Owner | Mixed | 14 Jan 2025 | |||
| Angshuman Ghosh | Chief Executive Officer, Director | Mixed | 14 Jan 2025 |
Recent insider transactions for Ribbon Acquisition Corp.
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.