Company · Ownership research

ALLEGRO MICROSYSTEMS, INC. ALGM

CIK 0000866291 · CUSIP 01749D105

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 01749D105 (ALGM), not CUSIP 01749D905 (ALGM), CUSIP 01749D955 (ALGM), and does not merge CUSIPs.

This page lists the top 20 of 257 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	FMR LLC CIK 315066 · View history	$497.85M 22,774,491 shares	0.03%	-5.48M(-19.40%)Reduced	SEC filing ↗ Feb 13, 2025	▾
02	VANGUARD GROUP INC CIK 102909 · View history	$307.85M 14,082,947 shares	0.01%	-636.59K(-4.30%)Reduced	SEC filing ↗ Feb 11, 2025	▾
03	BlackRock, Inc. CIK 2012383 · View history	$257.02M 11,757,608 shares	0.01%	-1.09M(-8.50%)Reduced	SEC filing ↗ Feb 7, 2025	▾
04	JPMORGAN CHASE & CO CIK 19617 · View history	$230.22M 10,531,507 shares	0.02%	-492.12K(-4.50%)Reduced	SEC filing ↗ Feb 12, 2025	▾
05	STATE STREET CORP CIK 93751 · View history	$128.48M 5,877,482 shares	0.01%	+391.19K(+7.10%)Added	SEC filing ↗ Feb 14, 2025	▾
06	Capital Research Global Investors CIK 1422848 · View history	$126.09M 5,768,208 shares	0.03%	+353.78K(+6.50%)Added	SEC filing ↗ Feb 13, 2025	▾
07	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · Amended · View history	$87.30M 3,993,682 shares	0.02%	+934.05K(+30.50%)Added	SEC filing ↗ Feb 12, 2025	▾
08	Clearbridge Investments, LLC CIK 1348883 · View history	$74.00M 3,384,997 shares	0.06%	-547.07K(-13.90%)Reduced	SEC filing ↗ Feb 12, 2025	▾
09	ADAGE CAPITAL PARTNERS GP, L.L.C. CIK 1165408 · View history	$59.76M 2,733,560 shares	0.10%	+911.99K(+50.10%)Added	SEC filing ↗ Feb 14, 2025	▾
10	MORGAN STANLEY CIK 895421 · Amended · View history	$58.08M 2,656,798 shares	0.00%	+619.90K(+30.40%)Added	SEC filing ↗ May 15, 2025	▾
11	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$51.70M 2,364,582 shares	0.00%	-196.90K(-7.70%)Reduced	SEC filing ↗ Feb 12, 2025	▾
12	PRINCIPAL FINANCIAL GROUP INC CIK 1126328 · View history	$49.65M 2,271,278 shares	0.03%	-228.48K(-9.10%)Reduced	SEC filing ↗ Jan 31, 2025	▾
13	WESTFIELD CAPITAL MANAGEMENT CO LP CIK 1177719 · View history	$49.13M 2,247,672 shares	0.21%	+233.19K(+11.60%)Added	SEC filing ↗ Feb 11, 2025	▾
14	Paloma Partners Management Co CIK 1103882 · View history	$45.99M 2,103,800 shares	3.03%	+1.59M(+312.80%)Added	SEC filing ↗ Feb 14, 2025	▾
15	Invesco Ltd. CIK 914208 · View history	$45.66M 2,088,761 shares	0.01%	-1.17M(-35.80%)Reduced	SEC filing ↗ Feb 13, 2025	▾
16	T. Rowe Price Investment Management, Inc. CIK 1897612 · View history	$45.16M 2,065,879 shares	0.03%	+491.17K(+31.20%)Added	SEC filing ↗ Feb 14, 2025	▾
17	Analog Century Management LP CIK 1753384 · View history	$43.75M 2,001,438 shares	2.93%	+291.99K(+17.10%)Added	SEC filing ↗ Feb 14, 2025	▾
18	Woodline Partners LP CIK 1784547 · View history	$40.08M 1,833,705 shares	0.27%	+285.57K(+18.40%)Added	SEC filing ↗ Feb 14, 2025	▾
19	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$37.58M 1,719,274 shares	0.01%	+404.76K(+30.80%)Added	SEC filing ↗ Feb 13, 2025	▾
20	Schonfeld Strategic Advisors LLC CIK 1665241 · View history	$35.43M 1,620,888 shares	0.22%	+1.62MNew	SEC filing ↗ Feb 14, 2025	▾

Showing 20 / 257 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

257

Cancelled or null records excluded

Disclosed shares

142,072,015

Not deduplicated across managers

Disclosed value

$3.11B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

ALLEGRO MICROSYSTEMS, INC. · Q4 2024

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This page includes 20 of 257 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.