Institutional Stake Radar — 13D/13G
Who is building a >5% stake right now, who is raising or exiting — with the filer's stated intent. Event-driven, days-fresh; the timely complement to the quarterly 13F snapshot.
13D vs 13G — what's the difference?
13D = "I own 5%+ and I intend to shake things up" — must publicly state plans (Item 4).
13G = "I own 5%+ but I'm just passing through" — passive holding, no control agenda.
| 13D · Activist | 13G · Passive | |
|---|---|---|
| Intent | Seeks to influence or control (board seats, sale/merger, strategy) | Financial investment only; no control intent |
| Deadline | 5 business days after crossing 5%; material changes within 2 | 5 business days (passive); up to 45 days after quarter end for QIIs |
| Disclosure | Rich — Item 4 stated purpose, funding source, agreements | Thin — essentially just share count and percent |
| Cap | No ceiling | Forced onto 13D above 20% (passive investors) |
Why it matters here: a 13D is inherently a stronger signal than a 13G, a 13G→13D switch (a quiet holder turning activist) is the strongest event on this radar, and Item 4 is the only public text where an institution states its plans in its own words — that's the "stated intent" column.
All
Activist 13D only
New stakes only
| Filed | Institution | Security | Event | Stake | Stated intent |
|---|---|---|---|---|---|
| 2026-10-06 | Starboard Value | Qorvo, Inc. | Exited (<5%) | 6.4% → 0.0% | Item 4 is hereby amended to add the following: As previously disclosed, on October 27, 2025, the Issuer entered into an Agreement and Plan of Merger (the "Merg |
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Stated purpose (Item 4 excerpt)
Item 4 is hereby amended to add the following:
As previously disclosed, on October 27, 2025, the Issuer entered into an Agreement and Plan of Merger (the "Merger Agreement") with Skyworks Solutions, Inc., a Delaware Corporation ("Skyworks"), Comet Acquisition Corp., a Delaware corporation and a wholly owned subsidiary of Skyworks ("Merger Sub I"), and Comet Acquisition II, LLC, a Delaware limited liability company and a wholly owned subsidiary of Skyworks ("Merger Sub II"). Pursuant to the Merger Agreement, on October 5, 2026, (i) Merger Sub I merged with and into the Issuer (the "First Merger"), with the Issuer surviving the First Merger as a wholly owned subsidiary of Skyworks (the "Surviving Corporation"), and (ii) immediately following the First Merger, and as the second step in a single integrated transaction with the First Merger, the Surviving Corporation merged with and into Merger Sub II (the "Second Merger," and together with the First Merger, the "Mergers"), with Merger Sub II continuing as the surviving entity in the Second Merger and a wholly owned subsidiary of Skyworks. Pursuant to the terms of the Merger Agreement, concurrently with the effective time of the First Merger (the "Effective Time"), (i) each Share held by the Reporting Persons that was outstanding immediately prior to the Effective Time was converted into the right to receive (A) 0.960 shares of common stock, par value $0.25 per share, of Skyworks ("Skyworks Common Stock"), without interest, and (B) $32.50 in cash, without interest (collectively, the "Merger Consideration") and (ii) each outstanding restricted stock unit award corresponding to Shares held by Mr. Feld was cancelled in consideration for the right to receive (x) the Merger Consideration in respect of each Share then subject thereto and (y) an amount in cash equal to all dividend equivalents accrued but unpaid with respect thereto. In addition, as a result of the Mergers and pursuant to the Merger Agreement, at the Effective…
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| 2026-10-06 | Citadel Advisors | Quantinuum Inc. | New passive stake | — | |
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| 2026-10-06 | Citadel Advisors | REALLOYS INC. | New passive stake | — | |
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| 2026-10-06 | Citadel Advisors | STARFIGHTERS SPACE, INC. | New passive stake | — | |
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| 2026-10-06 | Citadel Advisors | Eco Wave Power Global AB (publ) | New passive stake | — | |
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| 2026-10-05 | Viking Global Investors | MID AMERICA APARTMENT COMMUNITIES INC. | New passive stake | — | |
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| 2026-10-05 | Point72 Asset Management | E.W. SCRIPPS Co | New passive stake | — | |
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| 2026-09-30 | Millennium Management | AMERISAFE, Inc. | New passive stake | — | |
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| 2026-09-29 | Millennium Management | Sweetgreen, Inc. | New passive stake | — | |
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| 2026-09-28 | Millennium Management | Beyond Meat, Inc. | New passive stake | — | |
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| 2026-09-23 | Millennium Management | Haymaker Acquisition Corp V | New passive stake | — | |
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| 2026-09-22 | GAMCO Investors | TENNANT CO | Exited (<5%) | 4.4% | The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be techn |
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Stated purpose (Item 4 excerpt)
The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.
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| 2026-09-18 | Millennium Management | Lincoln International, Inc. | New passive stake | — | |
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| 2026-09-16 | Viking Global Investors | REGAL REXNORD CORP | New passive stake | — | |
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| 2026-09-14 | Markel Group | Hagerty, Inc. | Trimmed | 44.8% → 42.0% | Item 4 of the Schedule 13D is hereby amended and supplemented as follows: On September 11, 2026, in connection with the closing of an underwritten secondary of |
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Stated purpose (Item 4 excerpt)
Item 4 of the Schedule 13D is hereby amended and supplemented as follows:
On September 11, 2026, in connection with the closing of an underwritten secondary offering of shares of Class A Common Stock by Hagerty Holding Corp. (the "September 2026 Secondary Offering"), and pursuant to the terms of the Amended and Restated Exchange Agreement, the Reporting Person exchanged 7,836,411 shares of Class V Common Stock and associated OpCo Units for, at the election of the Company, an equal number of shares of Class A Common Stock.
In connection with the September 2026 Secondary Offering, the Reporting Person agreed to waive certain notice and participation rights afforded by the Amended and Restated Registration Rights Agreement (as defined and described in the Original Schedule 13D) solely with respect to the September 2026 Secondary Offering, and the Company and Reporting Person agreed that the September 2026 Secondary Offering would not count against or reduce the four (4) Shelf Underwritings (as defined in the Amended and Restated Registration Rights Agreement) demandable pursuant to Section 2.1.1(b) of the Amended and Restated Registration Rights Agreement.
On September 9, 2026, in connection with the September 2026 Secondary Offering, the Reporting Person entered into a lock-up agreement with the representatives of the underwriters of the September 2026 Secondary Offering (the "September 2026 Lock-Up Agreement"), pursuant to which the Reporting Person agreed, subject to certain customary exceptions, not to take any of the following actions during the period beginning on the date of the September 2026 Lock-Up Agreement and ending at the close of business 60 days after the date of the final prospectus supplement relating to the September 2026 Secondary Offering:
(i) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right, or warrant to purchase, lend, or otherwise transfer or dis…
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| 2026-09-14 | Duquesne Family Office | Guardian Metal Resources PLC | New passive stake | — | |
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| 2026-09-10 | GAMCO Investors | GABELLI MULTIMEDIA TRUST INC. | Exited (<5%) | 2.5% | The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be techn |
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Stated purpose (Item 4 excerpt)
The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.
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| 2026-09-09 | Millennium Management | First Horizon Corporation | New passive stake | — | |
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| 2026-08-31 | GAMCO Investors | NATHANS FAMOUS, INC. | Trimmed | 7.0% → 6.4% | The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be techn |
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Stated purpose (Item 4 excerpt)
The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.
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| 2026-08-20 | Point72 Asset Management | Viridian Therapeutics, Inc. | New passive stake | — | |
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| 2026-08-20 | Icahn Capital (Carl Icahn) | JETBLUE AIRWAYS CORP | Exited (<5%) | 5.5% → 3.3% | |
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| 2026-08-19 | Point72 Asset Management | RxSight, Inc. | New passive stake | — | |
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| 2026-08-19 | Millennium Management | T1 Energy Inc. | New passive stake | — | |
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| 2026-08-19 | Millennium Management | Vanda Pharmaceuticals Inc. | New passive stake | — | |
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| 2026-08-19 | Millennium Management | Capricor Therapeutics, Inc. | New passive stake | — | |
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| 2026-08-17 | Millennium Management | Groupon, Inc. | New passive stake | — | |
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| 2026-08-14 | Southeastern Asset Management | Empire State Realty Trust, Inc. | New passive stake | — | |
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| 2026-08-14 | Point72 Asset Management | Neuronetics, Inc. | New passive stake | — | |
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| 2026-08-14 | Greenlight Capital (DME) | Dauch Corporation | New passive stake | — | |
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| 2026-08-14 | GAMCO Investors | Sphere Entertainment Co. | Exited (<5%) | 1.9% | The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be techn |
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Stated purpose (Item 4 excerpt)
The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.
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| 2026-08-14 | GAMCO Investors | Madison Square Garden Sports Corp. | Exited (<5%) | 2.6% | The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be techn |
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Stated purpose (Item 4 excerpt)
The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.
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| 2026-08-14 | Elliott Investment Management | Pinterest, Inc. | New passive stake | — | |
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| 2026-08-14 | Coatue Management | Cerebras Systems Inc. | New passive stake | — | |
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| 2026-08-14 | Coatue Management | Forgent Power Solutions, Inc. | New passive stake | — | |
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| 2026-08-14 | Citadel Advisors | VILLAGE FARMS INTERNATIONAL, INC. | New passive stake | — | |
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| 2026-08-14 | Citadel Advisors | XCHG Limited | New passive stake | — | |
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| 2026-08-14 | Berkshire Hathaway | LENNAR CORPORATION | New passive stake | — | |
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| 2026-08-14 | Ariel Investments | Mattel Inc | New passive stake | — | |
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| 2026-08-14 | Altimeter Capital | Cerebras Systems Inc. | New passive stake | — | |
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| 2026-08-14 | AQR Capital Management | Roman DBDR Acquisition Corp. II | New passive stake | — | |
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| 2026-08-13 | Renaissance Technologies | Bolt Biotherapeutics, Inc. | New passive stake | — | |
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| 2026-08-13 | Renaissance Technologies | Commercial Vehicle Group, Inc. | New passive stake | — | |
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| 2026-08-13 | Renaissance Technologies | Stitch Fix, Inc. | New passive stake | — | |
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| 2026-08-13 | Renaissance Technologies | TILLY'S, INC. | New passive stake | — | |
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| 2026-08-13 | Millennium Management | Ralliant Corporation | New passive stake | — | |
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| 2026-08-13 | Dodge & Cox | ROP | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | Iridium Communications Inc. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | KEMPER Corp | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | nCino, Inc. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | NNN REIT, INC. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | OLIN Corp | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | Tonix Pharmaceuticals Holding Corp. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | Ultragenyx Pharmaceutical Inc. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | Vanda Pharmaceuticals Inc. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | VRSN | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | WHIRLPOOL CORP /DE/ | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | ZIPRECRUITER, INC. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | ZoomInfo Technologies Inc. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | GRAPHIC PACKAGING HOLDING CO | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | SITE Centers Corp. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | Irenic Acquisition Corp. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | Rubrik, Inc. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | NewHold Investment Corp IV | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | Velos Acquisition I Corp. f/k/a M3-Brigade Acquisition V Corp. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | Keystone Acquisition Corp. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | Gesher Acquisition Corp. II | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | DraftKings Inc. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | DENTSPLY SIRONA Inc. | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | MOLSON COORS BEVERAGE CO | New passive stake | — | |
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| 2026-08-13 | AQR Capital Management | Ares Acquisition Corp III | New passive stake | — | |
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| 2026-08-12 | GAMCO Investors | ASTEC INDUSTRIES INC | Exited (<5%) | 4.7% | The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be techn |
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Stated purpose (Item 4 excerpt)
The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.
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| 2026-08-12 | GAMCO Investors | WESTWOOD HOLDINGS GROUP INC | Exited (<5%) | 4.7% | The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be techn |
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Stated purpose (Item 4 excerpt)
The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.
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| 2026-08-12 | Davis Selected Advisers | JBS N.V. | New passive stake | — | |
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| 2026-08-12 | Capital Research Global | Arxis, Inc. | New passive stake | — | |
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| 2026-08-12 | Capital Research Global | Ovintiv Inc. | New passive stake | — | |
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| 2026-08-12 | Capital Research Global | Fair Isaac Corp. | New passive stake | — | |
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| 2026-08-12 | Capital Research Global | Tractor Supply Co. | New passive stake | — | |
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| 2026-08-12 | Capital Research Global | Quantinuum Inc. | New passive stake | — | |
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| 2026-08-12 | AQR Capital Management | Aldeyra Therapeutics, Inc. | New passive stake | — | |
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| 2026-08-12 | AQR Capital Management | Atlassian Corp | New passive stake | — | |
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Compiled from public SEC Schedule 13D/13G filings for a sample of 64 tracked institutions — NOT the whole market. These schedules only cover stakes above 5% of a class (rare for megacaps), reflect filing dates (days of lag), and intent text is an excerpt of the filer's own words. Institutional-behavior observation, not investment advice.