Comparable stake leader
Starboard Value LP
SEC ownership of ACACIA RESEARCH CORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000934549.
Disclosed value leader
Starboard Value LP
Comparable rows
0/50
Latest evidence
19 Aug 2026
- Public ticker
- ACTG on Nasdaq
- Parsed ownership sources
-
13F and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Starboard Value LP
Ranking: Comparable ownership first, then disclosed value
- Latest parsed ownership date
-
19 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000934549
- Issuer location
- New York, NY
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of ACACIA RESEARCH 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
Starboard Value LP
Disclosed value leader
Starboard Value LP
Comparable rows
0/50
Latest evidence
19 Aug 2026
13F
3/4/5
Highest disclosed value: $284,835,953
50 rows are not safely comparable across share classes.
Showing 1-8 of 50 holder rows.
Quick read
Starboard Value LP has the largest disclosed position value at $284.84M.
0 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 Starboard Value LP's linked filing trail.
Disclosed position value
Top 5
Starboard Value LP
$284.84M
Starboard Principal Co LP
$223.59M
STATE STREET CORP
$14.76M
DIMENSIONAL FUND ADVISORS LP
$13.71M
BlackRock, Inc.
$12.1M
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Starboard Value LP |
13F
3/4/5
Company · Other*, 10%+ Owner
|
—
class O/S missing
|
$284,835,953
61,123,595 shares
|
— | 30 Jun 2026 |
| Starboard Principal Co LP |
3/4/5
Other*, 10%+ Owner
|
—
class O/S missing
|
$223,593,725
61,123,595 shares
|
— | 16 May 2025 |
| STATE STREET CORP |
13F
Company
|
—
class O/S missing
|
$14,756,901
3,166,717 shares
|
— | 30 Jun 2026 |
| DIMENSIONAL FUND ADVISORS LP |
13F
Company
|
—
class O/S missing
|
$13,708,479
2,941,723 shares
|
— | 30 Jun 2026 |
| BlackRock, Inc. |
13F
Company
|
—
class O/S missing
|
$12,103,298
2,597,274 shares
|
— | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
—
class O/S missing
|
$6,920,971
1,485,187 shares
|
— | 30 Jun 2026 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
—
class O/S missing
|
$6,594,310
1,415,088 shares
|
— | 30 Jun 2026 |
| GOLDMAN SACHS GROUP INC |
13F
Company
|
—
class O/S missing
|
$5,476,260
1,175,163 shares
|
— | 30 Jun 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
Net insider flow leans to selling over the last 12 months. Net value: -$196,318.
Buys
$0
Insiders: 0
Sells
$196,318
Insiders: 2
Net
-$196,318
Shares: -42,188
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 42,188
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 42,188 | $0 | $196,318 | -$196,318 |
| 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 1-20 of 20 reporting-owner rows connected to ACACIA RESEARCH CORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
20
Largest Forms 3/4/5 holder
Starboard Principal Co LP
Net 12M change
-$196,318
Latest report
19 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Starboard Principal Co LP | Other*, 10%+ Owner | $223,593,725 | Mixed | 16 May 2025 | ||
| Starboard Value LP | Other*, 10%+ Owner | $223,593,725 | Mixed | 16 May 2025 | ||
| Maureen Oconnell | Director | $2,611,923 | -$46,000 | -1.7% | Mixed | 19 Aug 2026 |
| Jason W. Soncini | General Counsel | $1,873,941 | Mixed | 05 Jun 2026 | ||
| Marc W. Booth | Chief IP Officer | $1,215,712 | Mixed | 18 Jun 2023 | ||
| Clifford Press | Chief Executive Officer, Director | $975,875 | Mixed | 06 Sep 2022 | ||
| Kirsten Hoover | Interim CFO | $855,265 | Mixed | 09 Jun 2025 | ||
| Lawrence Wesley Golby | Chief Investment Officer | $835,027 | Mixed | 01 Aug 2022 | ||
| Katharine Wolanyk | Director | $698,085 | Mixed | 26 May 2023 | ||
| Jonathan Sagal | Director | $690,679 | Mixed | 26 May 2023 | ||
| Martin D. McNulty Jr. | Chief Executive Officer, Director | $668,756 | Mixed | 05 Jun 2026 | ||
| Richard Jay Rosenstein | Chief Financial Officer | $639,149 | Mixed | 06 Jun 2022 | ||
| Gavin T. Molinelli | Director | $629,213 | Mixed | 30 Jun 2026 | ||
| Robert Rasamny | Chief Administrative Officer | $414,120 | Mixed | 05 Jun 2026 | ||
| Ajay Sundar | Other* | $371,277 | Mixed | 23 Jun 2026 | ||
| Kohlberg Isaac T. | Director | $365,707 | -$150,318 | -29% | Filing P/S | 12 Aug 2026 |
| Meredith A. Simmons | General Counsel | $290,400 | Mixed | 04 Jun 2020 | ||
| Geoffrey G. Ribar | Director | $287,591 | Mixed | 30 May 2025 | ||
| Michael Sikoryak Zambito | Chief Financial Officer | $25,146 | Filing P/S | 11 Aug 2025 | ||
| Michelle Felman | Director | Mixed | 23 Jun 2026 |
Recent insider transactions for ACACIA RESEARCH 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Maureen Oconnell | ACTG | ACTG Common Stock | Sale | -3.36% | $46,000 | $4.60 | -10,000 | 287,655 | 19 Aug 2026 | Direct |
| Kohlberg Isaac T. | ACTG | ACTG Common Stock | Sale | -29.1% | $150,318 | $4.67 | -32,188 | 78,310 | 12 Aug 2026 | Direct |
| Gavin T. Molinelli | ACTG | Common Stock, par value $0.001 | Award | 3.23% | 6,438 | 205,966 | 30 Jun 2026 | Direct | ||
| Ajay Sundar | ACTG | Common Stock, par value $0.001 | Award | 4.04% | 4,175 | 107,605 | 23 Jun 2026 | Direct | ||
| Gavin T. Molinelli | ACTG | Common Stock, par value $0.001 | Award | 14.4% | 25,052 | 199,528 | 23 Jun 2026 | Direct | ||
| Kohlberg Isaac T. | ACTG | ACTG Common Stock | Award | 29.3% | 25,052 | 110,498 | 23 Jun 2026 | Direct | ||
| Maureen Oconnell | ACTG | ACTG Common Stock | Award | 9.19% | 25,052 | 297,655 | 23 Jun 2026 | Direct | ||
| Michelle Felman | ACTG | ACTG Common Stock | Award | 77.9% | 25,052 | 57,224 | 23 Jun 2026 | Direct | ||
| Jason W. Soncini | ACTG | ACTG Common Stock | Tax liability | -17.2% | -48,985 | 235,615 | 08 Jun 2026 | Direct | ||
| Robert Rasamny | ACTG | ACTG Common Stock | Tax liability | -27.7% | -28,390 | 73,976 | 08 Jun 2026 | Direct | ||
| Martin D. McNulty Jr. | ACTG | ACTG Common Stock | Tax liability | -40.7% | -287,133 | 418,430 | 08 Jun 2026 | Direct | ||
| Jason W. Soncini | ACTG | ACTG Common Stock | Award | 48.6% | 93,049 | 284,600 | 05 Jun 2026 | Direct | ||
| Robert Rasamny | ACTG | ACTG Common Stock | Award | 143.3% | 60,285 | 102,366 | 05 Jun 2026 | Direct | ||
| Martin D. McNulty Jr. | ACTG | ACTG Common Stock | Award | 324% | 539,160 | 705,563 | 05 Jun 2026 | Direct | ||
| Gavin T. Molinelli | ACTG | Common Stock, par value $0.001 | Award | 3.71% | 6,237 | 174,476 | 31 Mar 2026 | Direct | ||
| Ajay Sundar | ACTG | Common Stock, par value $0.001 | Award | 4.19% | 4,158 | 103,430 | 31 Mar 2026 | Direct | ||
| Jason W. Soncini | ACTG | ACTG Common Stock | Tax liability | -3.11% | -6,147 | 191,551 | 23 Mar 2026 | Direct | ||
| Martin D. McNulty Jr. | ACTG | ACTG Common Stock | Tax liability | -4.7% | -8,207 | 166,403 | 10 Mar 2026 | Direct | ||
| Ajay Sundar | ACTG | Common Stock, par value $0.001 | Award | 5.69% | 5,348 | 99,272 | 31 Dec 2025 | Direct | ||
| Gavin T. Molinelli | ACTG | Common Stock, par value $0.001 | Award | 5.01% | 8,021 | 168,239 | 31 Dec 2025 | Direct | ||
| Ajay Sundar | ACTG | Common Stock, par value $0.001 | Award | 7.01% | 6,154 | 93,924 | 30 Sep 2025 | Direct | ||
| Gavin T. Molinelli | ACTG | Common Stock, par value $0.001 | Award | 6.11% | 9,231 | 160,218 | 30 Sep 2025 | Direct |
* marks a reported price that did not pass the local price check.