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 278 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	$472.95M 17,542,774 shares	0.03%	+7.09M(+67.90%)Added	SEC filing ↗ May 13, 2024	▾
02	VANGUARD GROUP INC CIK 102909 · View history	$226.47M 8,400,064 shares	0.00%	+999.94K(+13.50%)Added	SEC filing ↗ May 10, 2024	▾
03	BlackRock Inc. CIK 1364742 · View history	$182.72M 6,777,470 shares	0.00%	+210.75K(+3.20%)Added	SEC filing ↗ May 10, 2024	▾
04	JPMORGAN CHASE & CO CIK 19617 · Amended · View history	$152.44M 5,654,160 shares	0.01%	+1.17M(+26.00%)Added	SEC filing ↗ Dec 26, 2024	▾
05	OEP CAPITAL ADVISORS, L.P. CIK 1817681 · View history	$115.91M 4,299,246 shares	42.16%	-8.35M(-66.00%)Reduced	SEC filing ↗ May 15, 2024	▾
06	Invesco Ltd. CIK 914208 · View history	$110.00M 4,080,133 shares	0.02%	-73.25K(-1.80%)Reduced	SEC filing ↗ May 14, 2024	▾
07	Clearbridge Investments, LLC CIK 1348883 · View history	$100.59M 3,731,268 shares	0.08%	+235.34K(+6.70%)Added	SEC filing ↗ May 13, 2024	▾
08	MORGAN STANLEY CIK 895421 · Amended · View history	$94.75M 3,514,631 shares	0.01%	+2.37M(+208.20%)Added	SEC filing ↗ Oct 17, 2024	▾
09	STATE STREET CORP CIK 93751 · View history	$94.52M 3,505,954 shares	0.00%	-44.24K(-1.20%)Reduced	SEC filing ↗ May 15, 2024	▾
10	T. Rowe Price Investment Management, Inc. CIK 1897612 · View history	$74.60M 2,767,125 shares	0.05%	+1.08M(+64.00%)Added	SEC filing ↗ May 15, 2024	▾
11	Allspring Global Investments Holdings, LLC CIK 1890906 · Amended · View history	$65.89M 2,444,042 shares	0.10%	-132.23K(-5.10%)Reduced	SEC filing ↗ Apr 29, 2024	▾
12	PRINCIPAL FINANCIAL GROUP INC CIK 1126328 · View history	$58.76M 2,179,587 shares	0.03%	+44.64K(+2.10%)Added	SEC filing ↗ Apr 29, 2024	▾
13	MANUFACTURERS LIFE INSURANCE COMPANY, THE CIK 928047 · View history	$50.22M 1,862,731 shares	0.05%	+687.31K(+58.50%)Added	SEC filing ↗ May 14, 2024	▾
14	Artisan Partners Limited Partnership CIK 1466153 · View history	$43.57M 1,616,084 shares	0.06%	+44.88K(+2.90%)Added	SEC filing ↗ May 13, 2024	▾
15	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$41.21M 1,528,583 shares	0.03%	+1.21M(+384.80%)Added	SEC filing ↗ May 15, 2024	▾
16	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$36.45M 1,351,833 shares	0.00%	+46.32K(+3.50%)Added	SEC filing ↗ May 13, 2024	▾
17	Balyasny Asset Management L.P. CIK 1218710 · View history	$31.20M 1,157,328 shares	0.08%	+1.16MNew	SEC filing ↗ May 13, 2024	▾
18	FIRST TRUST ADVISORS LP CIK 1125816 · View history	$29.70M 1,101,656 shares	0.03%	-52.07K(-4.50%)Reduced	SEC filing ↗ May 13, 2024	▾
19	ADAGE CAPITAL PARTNERS GP, L.L.C. CIK 1165408 · View history	$29.61M 1,098,202 shares	0.06%	+96.61K(+9.60%)Added	SEC filing ↗ May 15, 2024	▾
20	Amundi CIK 1330387 · View history	$29.22M 1,106,351 shares	0.01%	+560.12K(+102.50%)Added	SEC filing ↗ May 15, 2024	▾

Showing 20 / 278 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

278

Cancelled or null records excluded

Disclosed shares

103,965,538

Not deduplicated across managers

Disclosed value

$2.80B

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. · Q1 2024

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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.