Comparable stake leader
BERKLEY W R CORP
SEC ownership of Haymaker Acquisition Corp. 4
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001970509.
Disclosed value leader
Frederick Vincent Fortmiller Jr.
Comparable rows
41/42
Latest evidence
08 Apr 2026
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BERKLEY W R CORP
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
41 of 42
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BERKLEY W R CORP
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
08 Apr 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001970509
- Issuer location
- New York, NY
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 Haymaker Acquisition Corp. 4 (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
Frederick Vincent Fortmil...
Comparable rows
41/42
Latest evidence
08 Apr 2026
13F
13D/G
3/4/5
Lead comparable stake: 9.9%
1 rows are not safely comparable across share classes.
13D/G row: BERKLEY W R CORP
Showing 1-8 of 42 holder rows.
Quick read
BERKLEY W R CORP leads the comparable SEC ownership view at 9.9%.
41 of 42 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 BERKLEY W R CORP's linked filing trail.
Comparable ownership
Top 5
BERKLEY W R CORP
9.9%
Westchester Capital Management, LLC
8.2%
MIZUHO FINANCIAL GROUP INC
5.3%
First Trust Capital Management L.P.
1.1%
Fort Baker Capital Management LP
1.1%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 42 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BERKLEY W R CORP |
13F
13D/G
Company · W.R. Berkley Corporation
|
9.9%
from 13D/G
|
$26,721,996
2,321,633 shares
|
— | 31 Mar 2026 |
| Westchester Capital Management, LLC |
13F
13D/G
Company
|
8.2%
from 13D/G
|
$22,221,261
1,939,028 shares
|
— | 31 Mar 2026 |
| MIZUHO FINANCIAL GROUP INC |
13D/G
|
5.3%
|
$14,215,054
1,249,126 shares
|
$0 | 31 Dec 2025 |
| First Trust Capital Management L.P. |
13F
13D/G
Company
|
1.1%
from 13D/G
|
$2,794,934
243,886 shares
|
— | 31 Mar 2026 |
| Fort Baker Capital Management LP |
13F
13D/G
Company
|
1.1%
from 13D/G
|
$2,885,001
250,000 shares
|
— | 31 Mar 2026 |
| Frederick Vincent Fortmiller Jr. |
3/4/5
10%+ Owner
|
21%
|
$55,796,014
4,902,989 shares
|
— | 08 Apr 2026 |
| Harraden Circle Concentrated, LP |
3/4/5
10%+ Owner
|
21%
|
$55,796,014
4,902,989 shares
|
— | 08 Apr 2026 |
| Harraden Circle Investments, LLC |
3/4/5
13F
10%+ Owner · Company
|
21%
|
$55,796,014
4,902,989 shares
|
— | 08 Apr 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 17 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 1-13 of 13 reporting-owner rows connected to Haymaker Acquisition Corp. 4. Open a relationship link for the CIK-to-CIK filing trail.
Rows
13
Largest Forms 3/4/5 holder
Frederick Vincent Fortmiller Jr.
Net 12M change
$0
Latest report
08 Apr 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Frederick Vincent Fortmiller Jr. | 10%+ Owner | $55,796,014 | Mixed | 08 Apr 2026 | ||
| Harraden Circle Investors GP, LLC | 10%+ Owner | $55,796,014 | Mixed | 08 Apr 2026 | ||
| Harraden Circle Investors, LP | 10%+ Owner | $55,796,014 | Mixed | 08 Apr 2026 | ||
| Harraden Circle Special Opportunities, LP | 10%+ Owner | $55,796,014 | Mixed | 08 Apr 2026 | ||
| Harraden Circle Strategic Investments, LP | 10%+ Owner | $55,796,014 | Mixed | 08 Apr 2026 | ||
| Harraden Circle Concentrated, LP | 10%+ Owner | $55,796,014 | Mixed | 08 Apr 2026 | ||
| Harraden Circle Investments, LLC | 10%+ Owner | $55,796,014 | Mixed | 08 Apr 2026 | ||
| Harraden Circle Investors GP, LP | 10%+ Owner | $55,796,014 | Mixed | 08 Apr 2026 | ||
| Roger Meltzer | Director | Mixed | 25 Jul 2023 | |||
| Walter Field McLallen | Director | Mixed | 25 Jul 2023 | |||
| Christopher Bradley | Chief Financial Officer | Mixed | 25 Jul 2023 | |||
| Brian Shimko | Director | Mixed | 25 Jul 2023 | |||
| Haymaker Sponsor IV LLC | 10%+ Owner | Mixed | 25 Jul 2023 |
Recent insider transactions for Haymaker Acquisition Corp. 4
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Harraden Circle Investments, LLC | HYAC | Class A | 0 | 4,902,989 | 08 Apr 2026 | See Remarks | ||||
| Harraden Circle Investments, LLC | HYAC | Class A | 0 | 4,902,989 | 08 Apr 2026 | See Remarks | ||||
| Harraden Circle Investments, LLC | HYAC | Class A | 0 | 4,902,989 | 08 Apr 2026 | See Remarks | ||||
| Harraden Circle Investments, LLC | HYAC | Class A | 0 | 4,902,989 | 08 Apr 2026 | See Remarks | ||||
| Harraden Circle Investments, LLC | HYAC | Class A | 0 | 4,902,989 | 08 Apr 2026 | See Remarks | ||||
| Harraden Circle Investments, LLC | HYAC | Class A | 0 | 4,902,989 | 08 Apr 2026 | See Remarks | ||||
| Harraden Circle Investments, LLC | HYAC | Class A | 0 | 4,902,989 | 08 Apr 2026 | See Remarks | ||||
| Harraden Circle Investments, LLC | HYAC | Class A | 0 | 4,902,989 | 08 Apr 2026 | See Remarks |
* marks a reported price that did not pass the local price check.