ALGM insider buying and SEC filings, explained
Allegro Microsystems, Inc. · CIK 866291
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$3.5M
Planned sales (10b5-1)
$1.7M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Aug 17, 2026 | Planned (10b5-1) | Jennie Raubacher (Director) sold 1,000 shares at $45.32 ($45K), marked as a 10b5-1 plan trade. Holdings down 7% to 13,976 shares. | SEC filing Filed Aug 18, 2026 |
| Aug 10, 2026 | Planned (10b5-1) | Erin Hagen (SVP, CHRO) sold 2,285 shares at $44.39 ($101K), marked as a 10b5-1 plan trade. Holdings down 7% to 31,052 shares. | SEC filing Filed Aug 12, 2026 |
| Jun 3, 2026 | Sale | Richard Madormo (SVP, Worldwide Sales) sold 5,000 shares at $52.72 ($264K). Holdings down 7% to 69,687 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 4, 2026 |
| May 22, 2026 | Sale | Troy Coleman (SVP, General Manager, Products) sold 4,500 shares at $45.72 ($206K). Holdings down 5% to 77,476 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 26, 2026 |
| May 21, 2026 | Sale | Roald Graham Webster (VP, Chief Accounting Officer) sold 5,217 shares at $44.89 ($234K). Holdings down 28% to 13,106 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 22, 2026 |
| May 18, 2026 | Sale | Ian Kent (SVP, Global Operations) sold 2,642 shares at $41.56 ($110K). Holdings down 9% to 25,392 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 19, 2026 |
| May 14, 2026 | Sale | Susan D Lynch (Director) sold 16,711 shares at about $45.46 ($760K). Holdings down 57% to 12,805 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 15, 2026 |
| May 11, 2026 | Sale | Sharon Briansky (SVP, GC and Secretary) sold 8,948 shares at about $47.54 ($425K). Holdings down 11% to 75,232 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 13, 2026 |
| May 11, 2026 | Sale | Michael Doogue (CEO and Director) sold 30,089 shares indirectly (by trust) at about $47.23 ($1.4M). Holdings by trust down 11% to 252,797 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 13, 2026 |
| Mar 2, 2026 | Planned (10b5-1) | Sharon Briansky (SVP, GC and Secretary) sold 9,727 shares at $35.00 ($340K), marked as a 10b5-1 plan trade. Holdings down 10% to 84,180 shares. | SEC filing Filed Mar 3, 2026 |
| Mar 2, 2026 | Sale | Erin Hagen (SVP, CHRO) sold 2,598 shares at $35.00 ($91K). Holdings down 8% to 30,094 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 3, 2026 |
| Feb 17, 2026 | Planned (10b5-1) | Sharon Briansky (SVP, GC and Secretary) sold 9,258 shares at $41.56 ($385K), marked as a 10b5-1 plan trade. Holdings down 8% to 103,014 shares. | SEC filing Filed Feb 18, 2026 |
| Dec 10, 2025 | Planned (10b5-1) | Sharon Briansky (SVP, GC and Secretary) sold 27,873 shares at $30.00 ($836K), marked as a 10b5-1 plan trade. Holdings down 19% to 121,263 shares. | SEC filing Filed Dec 12, 2025 |
34 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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