ALLEGRO MICROSYSTEMS, INC. (ALGM) — Institutional Holders, Q2 2026

376 institutional investment managers reported a ALGM position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $10.2B. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.

← ALGM stock profile

ALGM in Q2 2026: what funds did

Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.

New positions

Added to

118

Trimmed

107

Sold out

Biggest buyers

Invesco Ltd.Added · +4,926,912 sh+$343.0M
JPMORGAN CHASEAdded · +4,071,722 sh+$283.5M
PRICE T ROWE ASSOCIATESAdded · +3,596,489 sh+$250.4M
BlackRockAdded · +1,394,456 sh+$97.1M
MASSACHUSETTS FINANCIAL SERVICESAdded · +1,374,198 sh+$95.7M

Biggest sellers

FMRTrimmed · -1,840,185 sh-$128.1M
NOMURA ASSET MANAGEMENT INTERNATIONALTrimmed · -921,138 sh-$64.1M
MARSHALL WACE, LLPTrimmed · -726,471 sh-$50.6M
SEGALL BRYANT & HAMILLTrimmed · -715,900 sh-$49.8M
ALLIANCEBERNSTEIN L.P.Trimmed · -522,167 sh-$36.4M

ALGM 13F holders ranked 1–100 of 376

Institutional investors reporting a position in ALLEGRO MICROSYSTEMS, INC. on SEC Form 13F-HR for Q2 2026, ranked by reported value.
#	Institution	Shares	Value	% of portfolio	QoQShares vs Q1 2026
1	FMR#1 · 25,581,021 sh	25,581,021	$1.8B	0.08%	-6.7%
2	BlackRock#2 · 13,889,324 sh	13,889,324	$967.0M	0.01%	+11.2%
3	Invesco Ltd.#3 · 13,678,393 sh	13,678,393	$952.3M	0.08%	+56.3%
4	JPMORGAN CHASE#4 · 12,723,790 sh	12,723,790	$844.9M	0.05%	+47.1%
5	Capital Research Global Investors#5 · 12,006,396 sh	12,006,396	$835.9M	0.12%	-3.5%
6	VANGUARD PORTFOLIO MANAGEMENT#6 · 7,668,472 sh	7,668,472	$533.9M	0.02%	-3.2%
7	STATE STREET#7 · 5,676,421 sh	5,676,421	$395.2M	0.01%	+8.6%
8	VANGUARD CAPITAL MANAGEMENT#8 · 5,508,806 sh	5,508,806	$383.5M	<0.01%	+0.8%
9	PRICE T ROWE ASSOCIATES#9 · 3,710,288 sh	3,710,288	$258.3M	0.03%	+3160.4%
10	Clearbridge Investments#10 · 2,946,239 sh	2,946,239	$205.1M	0.17%	+2.9%
11	GEODE CAPITAL MANAGEMENT#11 · 2,644,929 sh	2,644,929	$184.2M	<0.01%	+7.7%
12	DIMENSIONAL FUND ADVISORS#12 · 2,123,963 sh	2,123,963	$147.8M	0.03%	-2.1%
13	MORGAN STANLEY#13 · 1,809,335 sh	1,809,335	$126.0M	<0.01%	-20.5%
14	LOOMIS SAYLES & L P#14 · 1,619,931 sh	1,619,931	$112.8M	0.14%	-3.2%
15	GOLDMAN SACHS GROUP#15 · 1,575,057 sh	1,575,057	$109.7M	<0.01%	+9.6%
16	PRINCIPAL FINANCIAL GROUP#16 · 1,489,791 sh	1,489,791	$103.7M	0.05%	-16.8%
17	MASSACHUSETTS FINANCIAL SERVICES#17 · 1,443,495 sh	1,443,495	$100.5M	0.03%	+1983.1%
18	CHARLES SCHWAB INVESTMENT MANAGEMENT#18 · 1,360,525 sh	1,360,525	$94.7M	0.01%	-2.2%
19	NORGES BANK#19 · 1,294,958 sh	1,294,958	$90.2M	<0.01%	—
20	NORTHERN#20 · 1,167,135 sh	1,167,135	$81.3M	<0.01%	+11.6%
21	NOMURA ASSET MANAGEMENT INTERNATIONAL#21 · 1,159,503 sh	1,159,503	$80.7M	0.12%	-44.3%
22	ADAGE CAPITAL PARTNERS GP, L.L.C.#22 · 1,121,950 sh	1,121,950	$78.1M	0.11%	-23.4%
23	VOYA INVESTMENT MANAGEMENT#23 · 966,871 sh	966,871	$67.3M	0.06%	-33.7%
24	RAYMOND JAMES FINANCIAL#24 · 928,060 sh	928,060	$64.6M	0.02%	-6.8%
25	BANK OF AMERICA#25 · 921,728 sh	921,728	$64.2M	<0.01%	+7.7%
26	WELLINGTON MANAGEMENT GROUP LLP#26 · 814,937 sh	814,937	$56.7M	<0.01%	+21.1%
27	VANGUARD FIDUCIARY#27 · 800,030 sh	800,030	$55.7M	0.01%	+4.5%
28	UBS Group AG#28 · 780,945 sh	780,945	$54.4M	<0.01%	+79.4%
29	Nuveen#29 · 722,645 sh	722,645	$50.3M	0.01%	-23.7%
30	Bank of New York Mellon#30 · 716,952 sh	716,952	$49.9M	<0.01%	-3.5%
31	KENNEDY CAPITAL MANAGEMENT#31 · 689,668 sh	689,668	$48.0M	0.85%	-24.2%
32	FIRST ADVISORS#32 · 684,022 sh	684,022	$47.6M	0.03%	+64.9%
33	GW&K Investment Management#33 · 666,812 sh	666,812	$46.4M	0.36%	+1.1%
34	AMERIPRISE FINANCIAL#34 · 608,793 sh	608,793	$43.0M	<0.01%	+69.4%
35	Allspring Global Investments#35 · 620,540 sh	620,540	$39.2M	0.06%	+101.7%
36	ALLIANCEBERNSTEIN L.P.#36 · 1,201,203 sh	1,201,203	$37.9M	0.01%	-30.3%
37	SILVERCREST ASSET MANAGEMENT GROUP#37 · 537,082 sh	537,082	$37.4M	0.24%	-24.1%
38	LORD, ABBETT#38 · 525,863 sh	525,863	$36.6M	0.10%	-0.9%
39	T. Rowe Price Investment Management#39 · 517,648 sh	517,648	$36.0M	0.02%	-7.8%
40	AQR CAPITAL MANAGEMENT#40 · 493,753 sh	493,753	$33.4M	0.01%	+43.1%
41	Aperture Investors#41 · 443,427 sh	443,427	$30.9M	2.79%	-37.5%
42	BRAUN STACEY ASSOCIATES#42 · 366,493 sh	366,493	$25.5M	—	New
43	TWO SIGMA INVESTMENTS#43 · 343,994 sh	343,994	$23.9M	0.02%	-46.2%
44	RHUMBLINE ADVISERS#44 · 333,507 sh	333,507	$23.2M	0.02%	+8.1%
45	S Squared Technology#45 · 332,451 sh	332,451	$23.1M	7.18%	-27.3%
46	SEGALL BRYANT & HAMILL#46 · 332,440 sh	332,440	$23.1M	0.27%	-68.3%
47	FRONTIER CAPITAL MANAGEMENT#47 · 330,904 sh	330,904	$23.0M	0.21%	+25.3%
48	CIBC Bancorp USA#48 · 327,536 sh	327,536	$22.8M	0.03%	New
49	Gotham Asset Management#49 · 325,436 sh	325,436	$22.7M	0.05%	+4.2%
50	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME#50 · 323,297 sh	323,297	$22.5M	<0.01%	-6.3%
51	HRT FINANCIAL#51 · 316,439 sh	316,439	$22.0M	0.06%	+20.9%
52	Russell Investments Group, Ltd.#52 · 272,403 sh	272,403	$19.0M	0.02%	+183.5%
53	BALYASNY ASSET MANAGEMENT L.P.#53 · 267,283 sh	267,283	$18.6M	0.02%	+8.7%
54	Swiss National Bank#54 · 250,900 sh	250,900	$17.5M	<0.01%	-2.1%
55	FEDERATED HERMES#55 · 237,367 sh	237,367	$16.5M	0.02%	+2305.4%
56	Pier Capital#56 · 227,777 sh	227,777	$15.9M	2.10%	+0.5%
57	Granite Investment Partners#57 · 215,679 sh	215,679	$15.0M	0.77%	New
58	Lightrock Netherlands B.V.#58 · 206,490 sh	206,490	$14.4M	2.84%	-59.4%
59	PEREGRINE CAPITAL MANAGEMENT#59 · 200,422 sh	200,422	$14.0M	0.45%	-22.8%
60	Granahan Investment Management#60 · 185,461 sh	185,461	$12.9M	0.46%	-13.7%
61	Talos Eurisko Asset Management#61 · 182,600 sh	182,600	$12.7M	1.81%	-63.0%
62	SUSQUEHANNA INTERNATIONAL GROUP, LLP#62 · 178,568 sh	178,568	$12.4M	<0.01%	+54.8%
63	SEI INVESTMENTS#63 · 169,643 sh	169,643	$11.8M	0.01%	-22.5%
64	Retirement Systems of Alabama#64 · 169,402 sh	169,402	$11.8M	0.04%	-12.3%
65	Quantinno Capital Management#65 · 166,217 sh	166,217	$11.6M	0.01%	+24.1%
66	Legal & General Group Plc#66 · 164,734 sh	164,734	$11.5M	<0.01%	0.0%
67	CITIGROUP#67 · 148,210 sh	148,210	$10.3M	<0.01%	+39.6%
68	Nippon Life Global Investors Americas#68 · 143,870 sh	143,870	$10.0M	0.40%	New
69	TRILLIUM ASSET MANAGEMENT#69 · 143,348 sh	143,348	$10.0M	0.31%	+12.4%
70	CASTLEARK MANAGEMENT#70 · 141,900 sh	141,900	$9.9M	0.27%	-3.7%
71	MIRAE ASSET GLOBAL ETFS Ltd.#71 · 133,903 sh	133,903	$9.3M	0.01%	+5.1%
72	VANGUARD ASSET MANAGEMENT, Ltd#72 · 119,149 sh	119,149	$8.3M	<0.01%	+2.7%
73	ROYAL BANK OF CANADA#73 · 108,497 sh	108,497	$7.6M	<0.01%	+257.6%
74	Lisanti Capital Growth#74 · 107,865 sh	107,865	$7.5M	1.65%	New
75	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM#75 · 96,177 sh	96,177	$6.7M	0.01%	+3.6%
76	Man Group plc#76 · 95,101 sh	95,101	$6.6M	0.01%	-69.0%
77	WELLS FARGO & COMPANY#77 · 94,917 sh	94,917	$6.6M	<0.01%	+29.2%
78	Edgestream Partners, L.P.#78 · 92,188 sh	92,188	$6.4M	0.19%	New
79	MANUFACTURERS LIFE INSURANCE COMPANY, THE#79 · 91,616 sh	91,616	$6.4M	<0.01%	+13.0%
80	NEW YORK STATE COMMON RETIREMENT FUND#80 · 89,119 sh	89,119	$6.2M	<0.01%	+92.3%
81	DEUTSCHE BANK AG\#81 · 88,759 sh	88,759	$6.2M	<0.01%	+268.0%
82	STATE OF WISCONSIN INVESTMENT BOARD#82 · 88,089 sh	88,089	$6.1M	0.01%	-7.2%
83	ENVESTNET ASSET MANAGEMENT#83 · 85,884 sh	85,884	$6.0M	<0.01%	+91.1%
84	Candriam S.C.A.#84 · 84,708 sh	84,708	$5.9M	0.03%	-1.6%
85	ArrowMark Colorado#85 · 83,361 sh	83,361	$5.8M	0.24%	-31.0%
86	NATIXIS ADVISORS#86 · 76,653 sh	76,653	$5.3M	<0.01%	+61.8%
87	LPL Financial#87 · 71,589 sh	71,589	$5.0M	<0.01%	+98.4%
88	VAN ECK ASSOCIATES#88 · 70,504 sh	70,504	$4.9M	<0.01%	+68.8%
89	ALGERT GLOBAL#89 · 65,240 sh	65,240	$4.5M	0.05%	+868.0%
90	MetLife Investment Management#90 · 64,638 sh	64,638	$4.5M	0.02%	+5.9%
91	Holocene Advisors#91 · 63,010 sh	63,010	$4.4M	<0.01%	New
92	State of Tennessee, Treasury Department#92 · 62,389 sh	62,389	$4.3M	0.01%	-21.3%
93	Zurcher Kantonalbank (Zurich Cantonalbank)#93 · 61,148 sh	61,148	$4.3M	<0.01%	+25.8%
94	Handelsbanken Fonder AB#94 · 59,900 sh	59,900	$4.2M	0.01%	+49.8%
95	Informed Momentum#95 · 59,485 sh	59,485	$4.1M	0.37%	New
96	GUGGENHEIM CAPITAL#96 · 59,349 sh	59,349	$4.1M	0.03%	+10.5%
97	Neuberger Berman Group#97 · 59,204 sh	59,204	$4.1M	<0.01%	+2.1%
98	AMALGAMATED BANK#98 · 58,401 sh	58,401	$4.1M	—	+4.7%
99	Jupiter Topco#99 · 57,329 sh	57,329	$4.0M	<0.01%	—
100	Police & Firemen's Retirement System of New Jersey#100 · 56,462 sh	56,462	$3.9M	0.03%	+5.9%

Funds that sold out of ALGM in Q2 2026 (43)

Held ALGM at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.

Institutions that held ALGM in Q1 2026 and reported no position in Q2 2026.
Institution	Shares sold	Value in Q1 2026
CITADEL ADVISORS399,444 sh	399,444	$12.6M
G2 Investment Partners Management208,569 sh	208,569	$6.6M
KETTLE HILL CAPITAL MANAGEMENT181,531 sh	181,531	$5.7M
Roubaix Capital169,993 sh	169,993	$5.4M
Trexquant Investment133,800 sh	133,800	$4.2M
RENAISSANCE TECHNOLOGIES123,900 sh	123,900	$3.9M
Brevan Howard Capital Management95,099 sh	95,099	$3.0M
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT54,000 sh	54,000	$1.7M
BOOTHBAY FUND MANAGEMENT51,418 sh	51,418	$1.6M
Y-Intercept (Hong Kong) Ltd45,132 sh	45,132	$1.4M
TUDOR INVESTMENT ET AL37,128 sh	37,128	$1.2M
LECAP ASSET MANAGEMENT LTD28,521 sh	28,521	$899.3K
ALTFEST L J28,167 sh	28,167	$888.1K
MILLENNIUM MANAGEMENT28,127 sh	28,127	$886.8K
FOX RUN MANAGEMENT, L.L.C.27,987 sh	27,987	$784.8K
MOODY NATIONAL BANK DIVISION22,355 sh	22,355	$704.9K
CenterBook Partners21,847 sh	21,847	$688.8K
MIRABELLA FINANCIAL SERVICES LLP17,082 sh	17,082	$538.6K
Bridgewater Associates16,645 sh	16,645	$524.8K
PEAK615,503 sh	15,503	$488.8K
Catalyst Funds Management Pty Ltd13,500 sh	13,500	$425.7K
Alpine Global Management12,630 sh	12,630	$398.2K
Virtu Financial11,703 sh	11,703	$369.0K
Schonfeld Strategic Advisors11,699 sh	11,699	$368.9K
MML INVESTORS SERVICES10,975 sh	10,975	$346.0K
Fieldview Capital Management10,251 sh	10,251	$323.2K
Caitong International Asset Management , Ltd9,886 sh	9,886	$311.7K
BAILARD8,100 sh	8,100	$255.4K
LEUCADIA NATIONAL7,652 sh	7,652	$241.3K
SIH Partners, LLLP6,872 sh	6,872	$216.7K
Machina Capital S.A.S.6,847 sh	6,847	$215.9K
Headlands Technologies6,685 sh	6,685	$210.8K
Walleye Trading3,515 sh	3,515	$110.8K
Eurizon Capital SGR S.p.A.2,523 sh	2,523	$70.7K
Federation des caisses Desjardins du Quebec1,646 sh	1,646	$51.9K
Kemnay Advisory Services634 sh	634	$20.0K
MAI Capital Management429 sh	429	$13.5K
SIMPLEX TRADING154 sh	154	$4.9K
TWIN PEAKS WEALTH ADVISORS149 sh	149	$4.7K
Root Financial Partners98 sh	98	$3.1K
ATWOOD & PALMER15 sh	15	$473.00
IFP Advisors8 sh	8	$252.00
Rachor Investment Advisory Services7 sh	7	$221.00

Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.