Allegro Microsystems, Inc. (ALGM) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

207,475,000Shares Outstanding

801,331Shares held by institutions

$33,407,489Value of institutional holdings

61.63%Institutional ownership %

0.32%Shares Changed QoQ

271No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

According to SEC filings for the period ending December 2025, Allegro Microsystems, Inc. (NASDAQ:ALGM) is held by 271 institutional firms.

Institutional ownership in Allegro Microsystems edged down to 61.6% in December 2025, compared to 63.9% in September 2025.
On a quarter-over-quarter basis, institutional holdings shifted by 0.32%, with a year-over-year an increase of 7.11% in the count of filers.
Among the 271 institutional holders of Allegro Microsystems, 126 added to their stakes while 110 trimmed their positions and 35 held steady.
The total number of shares held by institutions in Allegro Microsystems increased to 127.87Mn as of December 2025, a net change of up by 403.54K shares quarter on quarter, and down 14.96Mn shares year over year.
FMR LLC's holding of 23.64Mn shares as of December 31, 2025 makes it the primary institutional investor in Allegro Microsystems, owning 11.39% of the stock.
Among the most significant buyers of Allegro Microsystems during December 2025 were CITADEL ADVISORS LLC (2.23Mn), NOMURA ASSET MANAGEMENT INTERNATIONAL INC. (2.04Mn), NORGES BANK (1.46Mn), ADAGE CAPITAL PARTNERS GP, L.L.C. (1.23Mn), BlackRock, Inc. (824.04K).
Leading sellers of Allegro Microsystems stock in December 2025 included FMR LLC (3.83Mn), Capital Research Global Investors (3.71Mn), ALLIANCEBERNSTEIN L.P. (1.54Mn), T. Rowe Price Investment Management, Inc. (954.06K), ROYAL BANK OF CANADA (604.94K).
The top 10 institutional holders of Allegro Microsystems for the quarter ending December 2025 included FMR LLC (23.64Mn), VANGUARD GROUP INC (14.20Mn), Capital Research Global Investors (13.11Mn), BlackRock, Inc. (12.20Mn), JPMORGAN CHASE & CO (7.35Mn), STATE STREET CORP (5.36Mn), Clearbridge Investments, LLC (2.92Mn), ADAGE CAPITAL PARTNERS GP, L.L.C. (2.80Mn), CITADEL ADVISORS LLC (2.56Mn), GEODE CAPITAL MANAGEMENT, LLC (2.39Mn).

271 Institutional Holders

801,331 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
FMR LLC	31 Dec, 2025	23,635,746	-3,832,097	-13.95%	$623,510,987.00
VANGUARD GROUP INC	31 Dec, 2025	14,202,528	-90,937	-0.64%	$374,662,689.00
Capital Research Global Investors	31 Dec, 2025	13,111,292	-3,713,430	-22.07%	$345,875,883.00
BlackRock, Inc.	31 Dec, 2025	12,201,457	824,039	7.24%	$321,874,446.00
JPMORGAN CHASE & CO	31 Dec, 2025	7,347,422	-383,845	-4.96%	$193,825,019.00
STATE STREET CORP	31 Dec, 2025	5,359,488	78,203	1.48%	$141,383,293.00
Clearbridge Investments, LLC	31 Dec, 2025	2,916,785	-16,021	-0.55%	$76,944,799.00
ADAGE CAPITAL PARTNERS GP, L.L.C.	31 Dec, 2025	2,803,944	1,227,317	77.84%	$73,968,043.00
CITADEL ADVISORS LLC	31 Dec, 2025	2,560,520	2,228,889	672.10%	$67,546,518.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	2,393,968	24,839	1.05%	$63,165,468.00
MORGAN STANLEY	31 Dec, 2025	2,233,136	294,107	15.17%	$58,910,171.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	2,140,147	169,597	8.61%	$56,461,794.00
NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	31 Dec, 2025	2,036,212	2,036,212	0.00%	$53,715,000.00
Analog Century Management LP	31 Dec, 2025	1,890,072	-459,834	-19.57%	$49,860,099.00
PRINCIPAL FINANCIAL GROUP INC	31 Dec, 2025	1,742,296	-171,778	-8.97%	$45,961,768.00
NORGES BANK	31 Dec, 2025	1,457,805	1,457,805	0.00%	$38,456,896.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	1,413,339	486,213	52.44%	$37,283,883.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	1,362,418	67,425	5.21%	$35,940,587.00
SEGALL BRYANT & HAMILL, LLC	31 Dec, 2025	1,248,310	-75,416	-5.70%	$32,930,418.00
ALLIANCEBERNSTEIN L.P.	31 Dec, 2025	1,148,652	-1,541,844	-57.31%	$30,301,440.00

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