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 249 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	$658.31M 28,253,811 shares	0.04%	+8.53M(+43.30%)Added	SEC filing ↗ Nov 13, 2024	▾
02	VANGUARD GROUP INC CIK 102909 · View history	$342.97M 14,719,541 shares	0.01%	+6.04M(+69.70%)Added	SEC filing ↗ Nov 13, 2024	▾
03	BlackRock, Inc. CIK 2012383 · View history	$299.25M 12,843,406 shares	0.01%	—	SEC filing ↗ Nov 13, 2024	▾
04	JPMORGAN CHASE & CO CIK 19617 · Amended · View history	$256.85M 11,023,628 shares	0.02%	+1.88M(+20.60%)Added	SEC filing ↗ Dec 26, 2024	▾
05	STATE STREET CORP CIK 93751 · View history	$127.83M 5,486,289 shares	0.01%	+1.62M(+41.70%)Added	SEC filing ↗ Nov 14, 2024	▾
06	Capital Research Global Investors CIK 1422848 · View history	$126.16M 5,414,432 shares	0.03%	+5.41MNew	SEC filing ↗ Nov 13, 2024	▾
07	Clearbridge Investments, LLC CIK 1348883 · View history	$91.62M 3,932,071 shares	0.07%	+252.76K(+6.90%)Added	SEC filing ↗ Nov 12, 2024	▾
08	Invesco Ltd. CIK 914208 · View history	$75.85M 3,255,275 shares	0.01%	-2.66M(-45.00%)Reduced	SEC filing ↗ Nov 12, 2024	▾
09	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$71.29M 3,059,634 shares	0.01%	+3.06MNew	SEC filing ↗ Nov 14, 2024	▾
10	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$59.70M 2,561,482 shares	0.00%	+1.19M(+86.50%)Added	SEC filing ↗ Nov 12, 2024	▾
11	PRINCIPAL FINANCIAL GROUP INC CIK 1126328 · Amended · View history	$58.24M 2,499,760 shares	0.03%	+308.94K(+14.10%)Added	SEC filing ↗ Oct 31, 2024	▾
12	MANUFACTURERS LIFE INSURANCE COMPANY, THE CIK 928047 · View history	$50.16M 2,152,922 shares	0.04%	+4.44K(+0.20%)Added	SEC filing ↗ Nov 13, 2024	▾
13	MORGAN STANLEY CIK 895421 · Amended · View history	$47.46M 2,036,894 shares	0.00%	-42.40K(-2.00%)Reduced	SEC filing ↗ May 14, 2025	▾
14	WESTFIELD CAPITAL MANAGEMENT CO LP CIK 1177719 · View history	$46.94M 2,014,481 shares	0.21%	+711.18K(+54.60%)Added	SEC filing ↗ Nov 12, 2024	▾
15	AMERIPRISE FINANCIAL INC CIK 820027 · View history	$45.45M 1,950,527 shares	0.01%	-146.19K(-7.00%)Reduced	SEC filing ↗ Nov 14, 2024	▾
16	ADAGE CAPITAL PARTNERS GP, L.L.C. CIK 1165408 · View history	$42.44M 1,821,567 shares	0.07%	+325.00K(+21.70%)Added	SEC filing ↗ Nov 14, 2024	▾
17	Analog Century Management LP CIK 1753384 · View history	$39.83M 1,709,448 shares	2.71%	+761.67K(+80.40%)Added	SEC filing ↗ Nov 14, 2024	▾
18	T. Rowe Price Investment Management, Inc. CIK 1897612 · View history	$36.69M 1,574,706 shares	0.02%	-1.28M(-44.80%)Reduced	SEC filing ↗ Nov 14, 2024	▾
19	Woodline Partners LP CIK 1784547 · View history	$36.07M 1,548,132 shares	0.30%	+104.36K(+7.20%)Added	SEC filing ↗ Nov 14, 2024	▾
20	Artisan Partners Limited Partnership CIK 1466153 · View history	$35.37M 1,518,095 shares	0.05%	-88.70K(-5.50%)Reduced	SEC filing ↗ Nov 12, 2024	▾

Showing 20 / 249 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

249

Cancelled or null records excluded

Disclosed shares

142,715,647

Not deduplicated across managers

Disclosed value

$3.32B

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. · Q3 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.