Comparable stake leader
FMR LLC
SEC ownership of ALLEGRO MICROSYSTEMS, INC.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000866291.
Disclosed value leader
FMR LLC
Comparable rows
50/50
Latest evidence
17 Jun 2026
- Public ticker
- ALGM on Nasdaq
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
FMR LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
FMR LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
17 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000866291
- Issuer location
- Manchester, NH
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 ALLEGRO MICROSYSTEMS, INC. (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
FMR LLC
Disclosed value leader
FMR LLC
Comparable rows
50/50
Latest evidence
17 Jun 2026
13D/G
13F
3/4/5
Lead comparable stake: 15%
13D/G row: FMR LLC
Showing 1-8 of 50 holder rows.
Quick read
FMR LLC leads the comparable SEC ownership view at 15%.
50 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 FMR LLC's linked filing trail.
Comparable ownership
Top 5
FMR LLC
15%
Capital Research Global Investors
7.1%
JPMORGAN CHASE & CO
4.8%
Michael C. Doogue
0.29%
Derek P. D'Antilio
0.13%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| FMR LLC |
13D/G
13F
Company
|
15%
|
$1,043,102,661
27,421,206 shares
|
+$143,998,860 | 31 Mar 2026 |
| Capital Research Global Investors |
13D/G
13F
Company
|
7.1%
|
$410,252,327
13,111,292 shares
|
-$87,395,004 | 31 Dec 2025 |
| JPMORGAN CHASE & CO |
13F
13D/G
Company
|
4.8%
from 13D/G
|
$242,604,037
8,652,068 shares
|
— | 31 Mar 2026 |
| Michael C. Doogue |
3/4/5
President and CEO, Director
|
0.29%
|
$16,769,955
531,873 shares
|
-$1,421,251 | 16 May 2026 |
| Derek P. D'Antilio |
3/4/5
EVP, CFO & Treasurer
|
0.13%
|
$7,529,773
238,813 shares
|
— | 16 May 2026 |
| Yoshihiro Suzuki |
3/4/5
Director
|
0.12%
|
$7,850,465
213,560 shares
|
— | 07 Aug 2025 |
| Sharon S. Briansky |
3/4/5
SVP, GC and Secretary
|
0.04%
|
$2,514,612
79,753 shares
|
-$1,986,777 | 16 May 2026 |
| Troy Coleman |
3/4/5
SVP, General Manager, Products
|
0.04%
|
$3,542,202
77,476 shares
|
-$205,740 | 22 May 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: -$5,722,996.
Buys
$0
Insiders: 0
Sells
$5,722,996
Insiders: 9
Net
-$5,722,996
Shares: -142,872
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 142,872
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 73,107 | $0 | $3,419,563 | -$3,419,563 |
| 3-6 | 0 | 21,583 | $0 | $816,137 | -$816,137 |
| 6-9 | 0 | 27,873 | $0 | $836,190 | -$836,190 |
| 9-12 | 0 | 20,309 | $0 | $651,106 | -$651,106 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 34 reporting-owner rows connected to ALLEGRO MICROSYSTEMS, INC.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
34
Largest Forms 3/4/5 holder
Sanken Electric Co., Ltd.
Net 12M change
-$5,722,997
Latest report
17 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Sanken Electric Co., Ltd. | 10%+ Owner | $1,383,411,231 | Filing P/S | 07 Aug 2024 | ||
| OEP SKNA, L.P. | 10%+ Owner | $494,884,886 | Mixed | 02 Feb 2023 | ||
| Ravi Vig | President and CEO, Director | $91,743,601 | Mixed | 13 Jun 2022 | ||
| Paul V Walsh Jr. | SVP, CFO & Treasurer | $21,871,032 | Mixed | 21 Dec 2021 | ||
| Michael C. Doogue | President and CEO, Director | $16,769,955 | -$1,421,251 | -7.8% | Median | 16 May 2026 |
| Yoshihiro Suzuki | Director | $7,850,465 | Mixed | 07 Aug 2025 | ||
| Derek P. D'Antilio | EVP, CFO & Treasurer | $7,529,773 | Median | 16 May 2026 | ||
| Vineet A. Nargolwala | President and CEO, Director | $7,075,965 | Filing P/S | 05 Nov 2024 | ||
| Reza Kazerounian | Director | $6,163,416 | Mixed | 03 Aug 2023 | ||
| Max R. Glover | SVP of Worldwide Sales | $5,124,362 | Mixed | 18 Nov 2024 | ||
| Christopher Brown | SVP and General Counsel | $4,065,464 | Mixed | 19 Nov 2021 | ||
| Richard Madormo | SVP, Worldwide Sales | $3,673,898 | -$263,600 | -6.7% | Filing P/S | 03 Jun 2026 |
| Joanne Valente | Svp, Chro | $3,553,173 | Mixed | 17 Nov 2023 | ||
| Troy Coleman | SVP, General Manager, Products | $3,542,202 | -$205,740 | -5.5% | Filing P/S | 22 May 2026 |
| Suman Narayan | SVP, Products | $3,019,251 | Mixed | 30 Aug 2024 | ||
| Sharon S. Briansky | SVP, GC and Secretary | $2,514,612 | -$1,986,777 | -44% | Median | 16 May 2026 |
| Thomas C. Teebagy Jr. | SVP of Operations and Quality | $2,056,341 | Mixed | 18 Nov 2022 | ||
| Joseph R. Martin | Director | $1,293,180 | Mixed | 07 Aug 2025 | ||
| Ian Kent | SVP, Global Operations | $1,055,291 | -$109,802 | -9.4% | Filing P/S | 16 May 2026 |
| Erin E. Hagen | Svp, Chro | $1,051,115 | -$248,171 | -19% | Median | 16 May 2026 |
Recent insider transactions for ALLEGRO MICROSYSTEMS, INC.
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Brian C. White | ALGM | Common Stock | Award | 594 | 594 | 17 Jun 2026 | Direct | |||
| Richard Madormo | ALGM | Common Stock | Sale | -6.69% | $263,600 | $52.72 | -5,000 | 69,687 | 03 Jun 2026 | Direct |
| Troy Coleman | ALGM | Common Stock | Sale | -5.49% | $205,740 | $45.72 | -4,500 | 77,476 | 22 May 2026 | Direct |
| Roald G. Webster | ALGM | Common Stock | Sale | -28.5% | $234,165 | $44.88 | -5,217 | 13,106 | 21 May 2026 | Direct |
| Ian Kent | ALGM | Common Stock | Sale | -9.42% | $109,802 | $41.56 | -2,642 | 25,392 | 18 May 2026 | Direct |
| Erin E. Hagen | ALGM | Common Stock | Tax liability | -14.8% | -5,815 | 33,337 | 16 May 2026 | Direct | ||
| Ian Kent | ALGM | Common Stock | Tax liability | -7.72% | -2,345 | 28,034 | 16 May 2026 | Direct | ||
| Derek P. D'Antilio | ALGM | Common Stock | Tax liability | -13.7% | -37,840 | 238,813 | 16 May 2026 | Direct | ||
| Richard Madormo | ALGM | Common Stock | Tax liability | -6.79% | -5,439 | 74,687 | 16 May 2026 | Direct | ||
| Roald G. Webster | ALGM | Common Stock | Tax liability | -18.9% | -4,277 | 18,323 | 16 May 2026 | Direct | ||
| Michael C. Doogue | ALGM | Common Stock | Tax liability | -17.8% | -60,508 | 279,076 | 16 May 2026 | Direct | ||
| Sharon S. Briansky | ALGM | Common Stock | Tax liability | -14.9% | -13,942 | 79,753 | 16 May 2026 | Direct | ||
| Troy Coleman | ALGM | Common Stock | Tax liability | -10.6% | -9,670 | 81,976 | 16 May 2026 | Direct | ||
| Susan D. Lynch | ALGM | Common Stock | Sale | -56.6% | $759,625 | $45.46 | -16,711 | 12,805 | 14 May 2026 | Direct |
| Robert J. Willett | ALGM | Common Stock | Award | 1,094 | 1,094 | 13 May 2026 | Direct | |||
| Ian Kent | ALGM | Common Stock | Award | 38.8% | 8,492 | 30,379 | 13 May 2026 | Direct | ||
| Richard Madormo | ALGM | Common Stock | Award | 32.8% | 19,815 | 80,126 | 13 May 2026 | Direct | ||
| Sharon Briansky | ALGM | Common Stock | Award | 24.5% | 18,463 | 93,695 | 13 May 2026 | Direct | ||
| Derek P. D'Antilio | ALGM | Common Stock | Award | 27.6% | 59,877 | 276,653 | 13 May 2026 | Direct | ||
| Troy Coleman | ALGM | Common Stock | Award | 24.6% | 18,116 | 91,646 | 13 May 2026 | Direct | ||
| Michael C. Doogue | ALGM | Common Stock | Award | 90% | 160,835 | 339,584 | 13 May 2026 | Direct | ||
| Erin E. Hagen | ALGM | Common Stock | Award | 30.1% | 9,058 | 39,152 | 13 May 2026 | Direct | ||
| Roald G. Webster | ALGM | Common Stock | Award | 30.6% | 5,300 | 22,600 | 13 May 2026 | Direct | ||
| Sharon Briansky | ALGM | Common Stock | Sale | -10.6% | $425,380 | $47.54 | -8,948 | 75,232 | 11 May 2026 | Direct |
| Michael C. Doogue | ALGM | Common Stock | Sale | -10.6% | $1,421,251 | $47.23 | -30,089 | 252,797 | 11 May 2026 | By the Michael C. Doogue Revocable Trust of 2015 |
| Richard Madormo | ALGM | Common Stock | Disposed to Issuer | -9.73% | -6,498 | 60,311 | 24 Mar 2026 | Direct | ||
| Sharon Briansky | ALGM | Common Stock | Sale | -10.4% | $340,445 | $35.00 | -9,727 | 84,180 | 02 Mar 2026 | Direct |
| Erin Hagen | ALGM | Common Stock | Sale | -7.95% | $90,930 | $35.00 | -2,598 | 30,094 | 02 Mar 2026 | Direct |
| Sharon Briansky | ALGM | Common Stock | Tax liability | -8.84% | -9,107 | 93,907 | 27 Feb 2026 | Direct | ||
| Derek P. D'Antilio | ALGM | Common Stock | Tax liability | -4.41% | -9,995 | 216,776 | 27 Feb 2026 | Direct | ||
| Erin Hagen | ALGM | Common Stock | Tax liability | -5.75% | -1,996 | 32,692 | 27 Feb 2026 | Direct | ||
| Sharon Briansky | ALGM | Common Stock | Sale | -8.25% | $384,762 | $41.56 | -9,258 | 103,014 | 17 Feb 2026 | Direct |
| Sharon Briansky | ALGM | Common Stock | Tax liability | -7.41% | -8,991 | 112,272 | 13 Feb 2026 | Direct | ||
| Derek P. D'Antilio | ALGM | Common Stock | Tax liability | -7.28% | -17,808 | 226,771 | 13 Feb 2026 | Direct | ||
| Ian Kent | ALGM | Common Stock | Award | 72.3% | 9,183 | 21,887 | 02 Feb 2026 | Direct | ||
| Sharon S. Briansky | ALGM | Common Stock | Sale | -18.7% | $836,190 | $30.00 | -27,873 | 121,263 | 10 Dec 2025 | Direct |
| Troy Coleman | ALGM | Common Stock | Award | 73,530 | 73,530 | 11 Nov 2025 | Direct | |||
| Roald G. Webster | ALGM | Common Stock | Sale | -32.3% | $271,193 | $32.81 | -8,266 | 17,300 | 22 Aug 2025 | Direct |
| Richard R. Lury | ALGM | Common Stock | Sale | -27.1% | $222,673 | $31.81 | -7,000 | 18,857 | 12 Aug 2025 | Direct |
| Mary G. Puma | ALGM | Common Stock | Award | 51.4% | 5,932 | 17,483 | 07 Aug 2025 | Direct | ||
| Joseph R. Martin | ALGM | Common Stock | Award | 20.3% | 5,932 | 35,179 | 07 Aug 2025 | Direct | ||
| Yoshihiro Suzuki | ALGM | Common Stock | Award | 2.86% | 5,932 | 213,560 | 07 Aug 2025 | Direct | ||
| Krishna G. Palepu | ALGM | Common Stock | Award | 147.2% | 5,932 | 9,961 | 07 Aug 2025 | Direct | ||
| Jennie M. Raubacher | ALGM | Common Stock | Award | 65.6% | 5,932 | 14,976 | 07 Aug 2025 | Direct | ||
| Susan D. Lynch | ALGM | Common Stock | Award | 25.2% | 5,932 | 29,516 | 07 Aug 2025 | Direct | ||
| Richard R. Lury | ALGM | Common Stock | Award | 29.8% | 5,932 | 25,857 | 07 Aug 2025 | Direct | ||
| Erin E. Hagen | ALGM | Common Stock | Sale | -12.7% | $157,241 | $31.18 | -5,043 | 34,688 | 04 Aug 2025 | Direct |
* marks a reported price that did not pass the local price check.