L3VLUP
ProSign in

ALGM in the 13F filings

Allegro Microsystems Inc · CUSIP 01749D105

Sector · SemiconductorsTheme · AI infrastructure and semiconductors· L3VLUP-definedTheme · Semiconductors
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
31 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
29
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 3 listed it in both
Shares listed
54,663,559
combined, among listed positions
Reported value
$1.7bn
combined, at the quarter end

1 line marked †. Value as filed implies a price far from other filers'. Each counts in holders and value as filed, and is left out of the net change in shares.

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 16 buyers (opened or added shares) and 16 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -1,900,647.

Managers listing ALGM in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

29 of 29 holders

ActionFiling
Fidelity (FMR LLC)27,421,206$865munder 0.1%Added+3,785,46015 May 2026 (the filing on sec.gov)
Capital Research Global Investors12,435,558$392m0.06%Trimmed-675,73413 May 2026 (the filing on sec.gov)
Invesco Ltd8,751,481$276munder 0.1%Added+1,100,43012 May 2026 (the filing on sec.gov)
AllianceBernstein LP1,723,370$45munder 0.1%Added+574,71815 May 2026 (the filing on sec.gov)
Marshall Wace LLP739,780$23munder 0.1%Added+25,20115 May 2026 (the filing on sec.gov)
Wellington Management Group LLP673,096$21munder 0.1%Trimmed-433,24115 May 2026 (the filing on sec.gov)
Two Sigma Investments LP639,841$20munder 0.1%Added+328,91615 May 2026 (the filing on sec.gov)
Citadel Advisors LLC399,444$13munder 0.1%Trimmed-2,161,07615 May 2026 (the filing on sec.gov)
AQR Capital Management LLC† Value as filed implies a price far from other filers'.345,126$10munder 0.1%Added+17,15315 May 2026 (the filing on sec.gov)
Man Group PLC306,349$9.7munder 0.1%Trimmed-80,75615 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC245,910$7.8munder 0.1%Trimmed-564,55015 May 2026 (the filing on sec.gov)
Walleye Capital LLC130,668$4.1munder 0.1%Added+127,06313 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC123,900$3.9munder 0.1%Trimmed-312,30014 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP115,383$3.6munder 0.1%Trimmed-18,89715 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc113,799$3.6munder 0.1%Added+12,43315 May 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP95,099$3.0munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
MFS Investment Management69,297$2.2munder 0.1%Trimmed-10,86014 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC57,977$1.8munder 0.1%Trimmed-61,76427 Oct 2026 (the filing on sec.gov)
Janus Henderson Group Ltd57,329$1.8munder 0.1%Held018 May 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP44,900$1.4munder 0.1%Newnew14 May 2026 (the filing on sec.gov)
Maverick Capital Ltd42,224$1.3munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Tudor Investment Corp37,128$1.2munder 0.1%Added+11,46315 May 2026 (the filing on sec.gov)
Millennium Management LLC28,127$887kunder 0.1%Trimmed-1,313,61215 May 2026 (the filing on sec.gov)
Bridgewater Associates LP16,645$525kunder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Jane Street Group LLC15,479$488kunder 0.1%Trimmed-165,69912 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (6)

Exited (4)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
7 in Q3 2024 to 7 in Q2 2026

Tracked managers listing it, at least.

051015202120222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
ALGM by quarter
QuarterHoldersReported valueBuyersSellers
Q4 20204$50mn.a.n.a.
Q1 20216$125mn.a.n.a.
Q2 20213$106mn.a.n.a.
Q3 20212$118mn.a.n.a.
Q4 20213$209mn.a.n.a.
Q1 20225$154mn.a.n.a.
Q2 20225$110mn.a.n.a.
Q3 20223$111mn.a.n.a.
Q4 20222$138mn.a.n.a.
Q1 202310$881mn.a.n.a.
Q2 202311$325mn.a.n.a.
Q3 202312$151mn.a.n.a.
Q4 20237$120m53
Q1 20245$560m43
Q2 20248$688m62
Q3 20247$907m61
Q4 202410$806m72
Q1 20256$1.1bn43
Q2 20258$1.7bn63
Q3 20254$1.4bn31
Q4 20253$989m2010
Q1 20264$1.3bn1616
Q2 20267$3.9bn920

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

ALGM and NVDA →ALGM and AVGO →ALGM and MU →Choose a stock to compare with ALGM →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own ALGM, latest filings →Back to the 13F Explorer →