Allegro Microsystems, Inc.
A maker of the tiny magnetic sensors and power chips that quietly run modern life, Allegro MicroSystems builds the components that measure wheel speed for anti-lock brakes, position for electric power steering, and current for everything from car motors to AI data centers. The company traces back to the semiconductor division of Sprague Electric, spun off in 1990 and bought by Japan's Sanken Electric. Fun fact: the "Allegro" name means "fast and lively" in music — fitting for chips that track motion, and the company still calls New Hampshire home.
Sold 38.77M
Sold 13.61M
Granted 1.39M · Sold 440.5K
Sold 392.4K
Granted 575.1K · Bought 15.0K · Sold 397.4K
Granted 486.3K · Bought 11.0K
Granted 255.3K · Sold 110.8K
Granted 377.8K · Bought 1.5K
Granted 12.2K
Granted 25.9K
Sold 2.1K
Granted 50.8K · Sold 10.0K
Granted 99.5K
Granted 219.4K · Sold 55.8K
Granted 91.6K · Sold 4.5K
Granted 24.3K · Sold 248.5K
Granted 57.4K · Sold 5.0K
Granted 25.0K · Sold 74.6K
Granted 53.7K · Sold 7.6K
Granted 19.1K
Granted 17.7K · Sold 2.6K
Granted 25.0K · Sold 43.3K
Granted 17.5K
Granted 15.0K
Granted 38.9K · Sold 13.5K
Granted 28.9K · Bought 590 · Sold 16.7K
Granted 10.0K
Granted 10.2K
Sold 12.1K
Granted 1.1K
Granted 594
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Sanken Electric Co., Ltd.10% owner · 2 transactions | -39.4% | 59.73Mas of Aug 2024 | — | — | 38.77M |
| Oep Skna GP, LLC +3 co-filers10% owner · 2 transactions | — | 17.65Mas of Feb 2023 | — | — | 13.61M |
| Vig RaviPresident and CEO, Director · 27 transactions | -17.3% | 4.31Mas of Jun 2022 | 1.39M | — | 440.5K |
| Walsh Paul V JrSVP, CFO & Treasurer · 8 transactions | -30.4% | 830.0Kas of Dec 2021 | — | — | 392.4K |
| Doogue MichaelPresident and CEO, Director · 41 transactions | +3.1% | 531.9K | 575.1K | 15.0K | 397.4K |
| Nargolwala Vineet APresident and CEO, Director · 16 transactions | — | 355.9Kas of Nov 2024 | 486.3K | 11.0K | — |
| Glover Max R.SVP of Worldwide Sales · 20 transactions | +4.1% | 266.3Kas of Nov 2024 | 255.3K | — | 110.8K |
| D'Antilio DerekEVP, CFO & Treasurer · 21 transactions | — | 238.8K | 377.8K | 1.5K | — |
| Kazerounian RezaDirector · 2 transactions | +5.9% | 219.8Kas of Aug 2023 | 12.2K | — | — |
| Suzuki YoshihiroDirector · 5 transactions | +13.8% | 213.6Kas of Aug 2025 | 25.9K | — | — |
| Brown ChristopherSVP and General Counsel · 1 transaction | -1.4% | 145.0Kas of Nov 2021 | — | — | 2.1K |
| Valente JoanneSVP, CHRO · 9 transactions | — | 126.7Kas of Nov 2023 | 50.8K | — | 10.0K |
| Narayan SumanSVP, Products · 12 transactions | — | 123.1Kas of Aug 2024 | 99.5K | — | — |
| Briansky SharonSVP, GC and Secretary · 27 transactions | — | 79.8K | 219.4K | — | 55.8K |
| Coleman TroySVP, General Manager, Products · 4 transactions | — | 77.5K | 91.6K | — | 4.5K |
| Teebagy Thomas C. Jr.SVP of Operations and Quality · 12 transactions | -78.5% | 73.3Kas of Nov 2022 | 24.3K | — | 248.5K |
| Madormo RichardSVP, Worldwide Sales · 5 transactions | — | 69.7K | 57.4K | — | 5.0K |
| Martin Joseph RDirector · 9 transactions | -58.5% | 35.2Kas of Aug 2025 | 25.0K | — | 74.6K |
| Hagen ErinSVP, CHRO · 11 transactions | — | 33.3K | 53.7K | — | 7.6K |
| Aldrich David JDirector · 3 transactions | +248.6% | 26.7Kas of Aug 2024 | 19.1K | — | — |
| Kent IanSVP, Global Operations · 4 transactions | — | 25.4K | 17.7K | — | 2.6K |
| Lury Richard R.Director · 10 transactions | -49.3% | 18.9Kas of Aug 2025 | 25.0K | — | 43.3K |
| Puma Mary GDirector · 3 transactions | — | 17.5Kas of Aug 2025 | 17.5K | — | — |
| Raubacher JennieDirector · 3 transactions | — | 15.0Kas of Aug 2025 | 15.0K | — | — |
| Webster Roald GrahamVP, Chief Accounting Officer · 14 transactions | — | 13.1K | 38.9K | — | 13.5K |
| Lynch Susan DDirector · 8 transactions | — | 12.8K | 28.9K | 590 | 16.7K |
| Palepu Krishna G.Director · 2 transactions | — | 10.5Kas of Aug 2025 | 10.0K | — | — |
| Schorr Paul IVDirector · 2 transactions | — | 10.2Kas of Aug 2024 | 10.2K | — | — |
| Fujita NoriharuDirector · 1 transaction | -54.7% | 10.0Kas of Sep 2021 | — | — | 12.1K |
| Willett RobertDirector · 1 transaction | — | 1.1K | 1.1K | — | — |
| White Brian CDirector · 1 transaction | — | 594 | 594 | — | — |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over the last 5 years: -54.18M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.