Comparable stake leader
Feis Equities LLC
SEC ownership of Cayson Acquisition Corp
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0002024203.
Disclosed value leader
BERKLEY W R CORP
Comparable rows
11/34
Latest evidence
31 Mar 2026
- Symbol
- CAPN, CAPNR, CAPNU on Nasdaq
- SEC evidence covered
- 13D/G, 13F, and 3/4/5
- Largest SEC-reported holder
- Feis Equities LLC
- Latest 13D/G holder
- Feis Equities LLC
- Latest parsed evidence date
- 31 Mar 2026
- CIK
- 0002024203
- Location
- New York, NY
Ownership snapshot
2 signals
Issuer
2 identity fields
Ownership snapshot
Top shareholders of Cayson 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
Feis Equities LLC
Disclosed value leader
BERKLEY W R CORP
Comparable rows
11/34
Latest evidence
31 Mar 2026
13D/G
13F
3/4/5
Lead comparable stake: 9.8%
23 rows are not safely comparable across share classes.
13D/G row: Feis Equities LLC
Showing 1-8 of 34 holder rows.
Quick read
Feis Equities LLC leads the comparable SEC ownership view at 9.8%.
11 of 34 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
Feis Equities LLC
9.8%
BERKLEY W R CORP
9.4%
MIZUHO FINANCIAL GROUP INC
9%
WOLVERINE ASSET MANAGEMENT LLC
5.2%
Polar Asset Management Partners Inc.
5.2%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 34 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Feis Equities LLC |
13D/G
|
9.8%
|
$8,187,182
769,472 shares
|
+$3,867,629 | 31 Dec 2025 |
| BERKLEY W R CORP |
13D/G
13F
W.R. Berkley Corporation · Company
|
9.4%
|
$10,990,048
997,282 shares
|
+$2,578,460 | 31 Mar 2026 |
| MIZUHO FINANCIAL GROUP INC |
13D/G
|
9%
|
$7,312,710
704,500 shares
|
+$5,190 | 30 Jun 2025 |
| WOLVERINE ASSET MANAGEMENT LLC |
13F
13D/G
Company
|
5.2%
from 13D/G
|
$3,034,280
282,882 shares
mixed-class rows
|
— | 31 Mar 2026 |
| Polar Asset Management Partners Inc. |
13F
13D/G
Company
|
5.2%
from 13D/G
|
$3,085,500
550,000 shares
mixed-class rows
|
— | 31 Mar 2026 |
| AQR CAPITAL MANAGEMENT LLC |
13D/G
|
4.6%
|
$3,650,590
357,901 shares
|
$0 | 31 Dec 2024 |
| MIZUHO SECURITIES USA LLC |
13F
Company
|
9%
|
$5,139,720
475,900 shares
|
— | 31 Mar 2026 |
| RLH Capital LLC |
13F
Company
|
2%
|
$1,168,398
106,218 shares
|
— | 31 Mar 2026 |
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 Cayson Acquisition Corp. Open a relationship link for the CIK-to-CIK filing trail.
Rows
6
Largest Forms 3/4/5 holder
Yawei Cao
Net 12M change
$0
Latest report
10 Oct 2025
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Yawei Cao | Chief Executive Officer, Director, 10%+ Owner | Mixed | 15 Oct 2024 | |||
| Zhuge Yue | Director | Mixed | 19 Sep 2024 | |||
| Dahe Zhang | Chief Financial Officer, 10%+ Owner | Mixed | 15 Oct 2024 | |||
| Annie Liang-Zhou | Director | Mixed | 19 Sep 2024 | |||
| Raymond Xia | Director | Mixed | 19 Sep 2024 | |||
| Sanxin Yan | Director | Mixed | 10 Oct 2025 |
Recent insider transactions for Cayson 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.