ALLEGRO MICROSYSTEMS, INC.

ALGMNASDAQ

$38.76+0.30 (+0.78%)as of Oct 6, 2026

Legend

Insider buy

Insider sell

Congress buy

Congress sell

Hedge Funds
bought vs soldGreener markers show more buyers; redder markers show more sellers.

Company share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size.

Insider buy
Insider sell
Congress buy
Congress sell
Hedge Funds bought vs sold

Share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size. Greener fund markers mean more buyers.

Insider Buy
Insider Sell
Congress Buy
Congress Sell
Hedge funds bought vs sold
BuybackNo changeNet dilution

ALLEGRO MICROSYSTEMS, INC. price and activity chart data

Showing the 1Y range: Oct 6, 2025 to Oct 6, 2026. Price (+37.3%). 0 insider or congressional trades plotted in this window as 0 markers; nearby trades of the same kind are grouped.

Transactions plotted on the price chart
Date	Category	Person	Role	Action	Amount	Change in holding

Largest institutional holders

13F · Q2 2026

Fund	% of company held	Value	% of portfolio	Quarterly activity
FMR LLC	13.73%	$1.78B	0.08%	Not reported
BlackRock, Inc.	7.45%	$967M	0.01%	Not reported
Invesco Ltd.	7.34%	$952M	0.08%	Not reported
JPMorgan Chase & Co	6.83%	$845M	0.05%	Not reported
Capital Research Global Investors	6.44%	$836M	0.12%	Not reported
Vanguard Portfolio Management LLC	4.12%	$534M	0.02%	Not reported
State Street Corp	3.05%	$395M	0.01%	Not reported
Vanguard Capital Management LLC	2.96%	$384M	0.01%	Not reported
Clearbridge Investments, LLC	1.58%	$205M	0.17%	Not reported
Geode Capital Management, LLC	1.42%	$184M	0.01%	Not reported
Dimensional Fund Advisors LP	1.14%	$148M	0.03%	Not reported
Morgan Stanley	0.97%	$126M	0.01%	Not reported
Loomis Sayles & Co L P	0.87%	$113M	0.14%	Reduce 3.24%
Goldman Sachs Group Inc	0.85%	$110M	0.01%	Not reported
Principal Financial Group Inc	0.80%	$104M	0.05%	Not reported
Massachusetts Financial Services Co	0.77%	$100M	0.03%	Add 1983.06%
Charles Schwab Investment Management Inc	0.73%	$94.7M	0.01%	Not reported
Norges Bank	0.70%	$90.2M	0.01%	Not reported
Alliancebernstein L.P.	0.64%	$37.9M	0.01%	Not reported
Northern Trust Corp	0.63%	$81.3M	0.01%	Not reported
Nomura Asset Management International Inc.	0.62%	$80.7M	0.12%	Reduce 44.27%
Adage Capital Partners GP, L.L.C.	0.60%	$78.1M	0.11%	Reduce 23.40%
Voya Investment Management LLC	0.52%	$67.3M	0.06%	Not reported
Raymond James Financial Inc	0.50%	$64.6M	0.02%	Not reported
Bank of America Corp	0.49%	$64.2M	0.00%	Not reported
Wellington Management Group LLP	0.44%	$56.7M	0.01%	Add 21.07%
Vanguard Fiduciary Trust Co	0.43%	$55.7M	0.01%	Not reported
UBS Group AG	0.42%	$54.4M	0.01%	Not reported
Nuveen, LLC	0.39%	$50.3M	0.01%	Not reported
Bank of New York Mellon Corp	0.38%	$49.9M	0.01%	Not reported
Kennedy Capital Management LLC	0.37%	$48M	0.85%	Reduce 24.22%
First Trust Advisors LP	0.37%	$47.6M	0.03%	Add 64.87%
GW&K Investment Management, LLC	0.36%	$46.4M	0.36%	Not reported
Ameriprise Financial Inc	0.33%	$43M	0.01%	Not reported
Silvercrest Asset Management Group LLC	0.29%	$37.4M	0.25%	Reduce 24.13%
Lord, Abbett & Co. LLC	0.28%	$36.6M	0.10%	Reduce 0.87%
T. Rowe Price Investment Management, Inc.	0.28%	$36M	0.02%	Reduce 7.78%
AQR Capital Management LLC	0.27%	$33.4M	0.01%	Not reported
Aperture Investors, LLC	0.24%	$30.9M	2.79%	Reduce 37.52%
Braun Stacey Associates Inc	0.20%	$25.5M	0.72%	New Not reported
Two Sigma Investments, LP	0.18%	$23.9M	0.02%	Not reported
Rhumbline Advisers	0.18%	$23.2M	0.02%	Not reported
S Squared Technology, LLC	0.18%	$23.1M	7.18%	Reduce 27.33%
Segall Bryant & Hamill, LLC	0.18%	$23.1M	0.27%	Reduce 68.19%
Frontier Capital Management Co LLC	0.18%	$23M	0.21%	Add 25.33%
Gotham Asset Management, LLC	0.17%	$22.7M	0.05%	Add 4.22%
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	0.17%	$22.5M	0.00%	Not reported
Russell Investments Group, Ltd.	0.15%	$19M	0.02%	Not reported
Balyasny Asset Management L.P.	0.14%	$18.6M	0.02%	Not reported
Swiss National Bank	0.13%	$17.5M	0.01%	Not reported

50 of 347 holders

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