Stocks › ALGM
ALLEGRO MICROSYSTEMS, INC.
ALGM·Nasdaq·
United States·USD
United States·USD$38.76
+0.30 (+0.78%)
Close · Oct 6, 2026 · Close Prices from Tiingo.com
ALGM
ALLEGRO MICROSYSTEMS, INC. · Nasdaq
Nasdaq 100S&P 500
Filings
Default90D1Y5YALL
ALGMS&P 500 (rebased)
Congress BuyCongress SellInsider BuyInsider SellForm 1448-K ResultsLobbying
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Daily closes, adjusted for splits and dividends · Close Prices from Tiingo.comHover a marker, every one is a filing · move across the line for the crosshair
Congressional Trades
Recent trades of ALGM by members of U.S. Congress · 10 on record
Whale Activity
Position changes in ALGM reported for 2026-06-30 by 9 tracked institutional filers
- Increased2
- New0
- Held0
- Decreased2
- Closed4
- No prior filing1
| Filer | Shares | Value | Change |
|---|---|---|---|
| BlackRock, Inc. | 13.9M | $967.0M | increased |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 7.7M | $533.9M | decreased |
| VANGUARD CAPITAL MANAGEMENT LLC | 5.5M | $383.5M | increased |
| KENNEDY CAPITAL MANAGEMENT LLC | 689.7K | $48.0M | — |
| TWO SIGMA INVESTMENTS, LP | 344.0K | $23.9M | decreased |
| Citadel Advisors LLC | 0 | $0 | closed |
| Bridgewater Associates | 0 | $0 | closed |
| Millennium Management LLC | 0 | $0 | closed |
| Renaissance Technologies | 0 | $0 | closed |
KeyVex tracks a curated set of large 13F filers plus the largest positions in recent filings, so this is a sample of institutional activity, not the whole market.
Insider Trading
Net shares bought (+) or sold (−) on the open market by ALGM insiders, by quarter · Form 4
Recent Insider Transactions
416 transactions on record · newest first
| Insider | Type | Shares | Price | Value | Date | |
|---|---|---|---|---|---|---|
| Raubacher JennieDirector · Director | Sale | −1,000 | $45.32 | $45K | Aug 17, 2026 | Form 4 ↗ |
| Hagen ErinSVP, CHRO | Sale | −2,285 | $44.39 | $101K | Aug 10, 2026 | Form 4 ↗ |
| WHITE BRIAN CDirector | Grant / award | +594 | $0.00 | $0 | Jun 17, 2026 | Form 4 ↗ |
| Madormo RichardSVP, Worldwide Sales | Sale | −5,000 | $52.72 | $264K | Jun 3, 2026 | Form 4 ↗ |
| Coleman TroySVP, General Manager, Products | Sale | −4,500 | $45.72 | $206K | May 22, 2026 | Form 4 ↗ |
| Webster Roald GrahamVP, Chief Accounting Officer | Sale | −5,217 | $44.89 | $234K | May 21, 2026 | Form 4 ↗ |
| Kent IanSVP, Global Operations | Sale | −2,642 | $41.56 | $110K | May 18, 2026 | Form 4 ↗ |
| Kent IanSVP, Global Operations | Tax withholding | −2,345 | $43.10 | $101K | May 16, 2026 | Form 4 ↗ |
| Hagen ErinSVP, CHRO | Tax withholding | −5,815 | $43.10 | $251K | May 16, 2026 | Form 4 ↗ |
| D'Antilio DerekEVP, CFO & Treasurer | Tax withholding | −37.8K | $43.10 | $1.6M | May 16, 2026 | Form 4 ↗ |
| Madormo RichardSVP, Worldwide Sales | Tax withholding | −5,439 | $43.10 | $234K | May 16, 2026 | Form 4 ↗ |
| Webster Roald GrahamVP, Chief Accounting Officer | Tax withholding | −4,277 | $43.10 | $184K | May 16, 2026 | Form 4 ↗ |
| Doogue MichaelPresident and CEO · Director | Tax withholding | −60.5K | $43.10 | $2.6M | May 16, 2026 | Form 4 ↗ |
| Briansky SharonSVP, GC and Secretary | Tax withholding | −13.9K | $43.10 | $601K | May 16, 2026 | Form 4 ↗ |
| Coleman TroySVP, General Manager, Products | Tax withholding | −9,670 | $43.10 | $417K | May 16, 2026 | Form 4 ↗ |
| Lynch Susan DDirector | Sale | −16.7K | $45.46 | $760K | May 14, 2026 | Form 4 ↗ |
| Willett RobertDirector | Grant / award | +1,094 | $0.00 | $0 | May 13, 2026 | Form 4 ↗ |
| Kent IanSVP, Global Operations | Grant / award | +8,492 | $0.00 | $0 | May 13, 2026 | Form 4 ↗ |
| D'Antilio DerekEVP, CFO & Treasurer | Grant / award | +30.4K | $0.00 | $0 | May 13, 2026 | Form 4 ↗ |
| D'Antilio DerekEVP, CFO & Treasurer | Grant / award | +29.4K | $0.00 | $0 | May 13, 2026 | Form 4 ↗ |
Fund Holders
Mutual funds and ETFs holding ALGM · SEC Form N-PORT
| Fund | Shares | Value | % of fund | As of |
|---|---|---|---|---|
| Select Semiconductors Portfolio Fidelity Select Portfolios | 16.7M | $801.3M | 1.56% | May 31, 2026 |
| SMALLCAP World Fund Inc | 5.5M | $383.2M | 0.41% | Jun 30, 2026 |
| iShares Core S&P Mid-Cap ETF iShares Trust | 4.2M | $295.8M | 0.24% | Jun 30, 2026 |
| Capital World Growth & Income Fund | 5.9M | $283.7M | 0.18% | May 31, 2026 |
| VANGUARD TOTAL STOCK MARKET INDEX FUND VANGUARD INDEX FUNDS | 3.8M | $267.4M | 0.01% | Jun 30, 2026 |
| VANGUARD SMALL-CAP INDEX FUND VANGUARD INDEX FUNDS | 2.8M | $193.3M | 0.10% | Jun 30, 2026 |
| Invesco Small Cap Value Fund AIM Sector Funds (Invesco Sector Funds) | 4.4M | $184.3M | 1.66% | Jul 31, 2026 |
| VANGUARD INFORMATION TECHNOLOGY INDEX FUND VANGUARD WORLD FUND | 3.1M | $149.3M | 0.09% | May 31, 2026 |
| JPMorgan Growth Advantage Fund J.P. Morgan Mutual Fund Investment Trust | 2.0M | $136.3M | 0.61% | Jun 30, 2026 |
| T. Rowe Price New Horizons Fund, Inc. | 1.6M | $114.6M | 0.78% | Jun 30, 2026 |
Mutual funds and ETFs whose N-PORT filings list ALGM's shares (CUSIP 01749D105), each fund at its latest report since Mar 7, 2026, largest positions first. Bonds, options and short positions are left out.
Activist & Passive Stakes
Schedule 13D / 13G beneficial-ownership filings
- Invesco Ltd.SCHEDULE 13G · passive (13G) · 13.7M shares7.3%
Aug 13, 2026 · ↗ - Abigail P. JohnsonSCHEDULE 13G/A · passive (13G) · 25.6M shares13.7%
Aug 6, 2026 · ↗ - FMR LLCSCHEDULE 13G/A · passive (13G) · 25.6M shares13.7%
Aug 6, 2026 · ↗ - BlackRock, Inc.SCHEDULE 13G/A · passive (13G) · 12.8M shares6.9%
Jul 27, 2026 · ↗ - JPMORGAN CHASE & COSCHEDULE 13G · passive (13G) · 12.7M shares6.8%
Jul 16, 2026 · ↗ - Abigail P. JohnsonSCHEDULE 13G/A · passive (13G) · 27.4M shares14.8%
May 6, 2026 · ↗ - FMR LLCSCHEDULE 13G/A · passive (13G) · 27.4M shares14.8%
May 6, 2026 · ↗
Corporate Lobbying
Estimated quarterly lobbying spending reported under the LDA, filings naming ALLEGRO MICROSYSTEMS, INC. as client
No lobbying filings found naming ALLEGRO MICROSYSTEMS, INC. as the client.
Government Contracts
Federal awards to ALLEGRO MICROSYSTEMS, INC. · USAspending
No federal contract awards found for ALLEGRO MICROSYSTEMS, INC..
U.S. Patents
Recent USPTO applications naming ALLEGRO MICROSYSTEMS, INC.
No USPTO patent applications found for ALLEGRO MICROSYSTEMS, INC..
Annual Financials
From ALGM's 10-K filings · XBRL
No annual XBRL figures on record for ALGM. KeyVex's fundamentals cover about 130 large companies so far.
Stock Splits
Every split and reverse split in the price history
No stock splits in ALGM's price history.
Material Events (8-K)
Corporate events filed with the SEC
- 8-K · Items 5.07, 9.01Shareholder voteAug 7, 2026
EDGAR ↗ - 8-K · Items 2.02, 9.01Results of operationsJul 30, 2026
EDGAR ↗ - 8-K · Items 5.02, 7.01, 9.01Officer / director change · Reg FD disclosureJun 18, 2026
EDGAR ↗ - 8-K · Items 5.02, 7.01, 9.01Officer / director change · Reg FD disclosureMay 13, 2026
EDGAR ↗ - 8-K · Items 2.02, 9.01Results of operationsMay 7, 2026
EDGAR ↗
About ALLEGRO MICROSYSTEMS, INC.
From SEC EDGAR company records
Industry (SIC 3674)Semiconductors & Related Devices
SectorTechnology
HeadquartersMANCHESTER, NH
SEC CIK0000866291 ↗
Former namesALLEGRO MICROSYSTEMS, INC., ALLEGRO MICROSYSTEMS INC