Ticker · CUSIP 01749D105

ALGM

ALLEGRO MICROSYSTEMS INC

Technology·Semiconductors

···Share

Holders (tracked)

Combined shares

9,100,499

Combined value

$240.07M

Last close

$40.00

Quarter

2025Q4

Price is +51.6% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$40.00+21.94 (+121.48%)H $42.81 · L $16.53 · Avg Vol 2.2M

Position opened

Tracked holders · last 8 quarters

+6 vs previous quarter over the last 8.

SEC event timeline

20 events

Ken Griffin (Citadel Advisors) added2026-02-17
+2,228,889 shares · 2025Q4
Position
Two Sigma Investments added2026-02-17
+149,577 shares · 2025Q4
Position
D.E. Shaw & Co. opened position2026-02-17
+55,304 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) added2026-02-17
+539,113 shares · 2025Q4
Position
Steve Cohen (Point72) added2026-02-17
+132,465 shares · 2025Q4
Position
T. Rowe Price added2026-02-17
+4,736 shares · 2025Q4
Position
Paul Tudor Jones (Tudor Investment) opened position2026-02-17
+25,665 shares · 2025Q4
Position
Wellington Management trimmed2026-02-17
−54,580 shares · 2025Q4
Position
AQR Capital Management added2026-02-17
+77,589 shares · 2025Q4
Position
Renaissance Technologies opened position2026-02-12
+436,200 shares · 2025Q4
Position
Norges Bank (Norway SWF) opened position2026-02-10
+1,457,805 shares · 2025Q4
Position
AQR Capital Management added2025-11-14
+229,655 shares · 2025Q3
Position
Izzy Englander (Millennium Mgmt) added2025-11-14
+123,008 shares · 2025Q3
Position
T. Rowe Price added2025-11-14
+7,303 shares · 2025Q3
Position
Two Sigma Investments trimmed2025-11-14
−185,458 shares · 2025Q3
Position
Steve Cohen (Point72) added2025-11-14
+692,245 shares · 2025Q3
Position
Wellington Management trimmed2025-11-14
−1,475,922 shares · 2025Q3
Position
Ray Dalio (Bridgewater Associates) exited2025-11-13
−77,321 shares · 2025Q3
Position
Norges Bank (Norway SWF) exited2025-11-13
−1,407,943 shares · 2025Q3
Position
Norges Bank (Norway SWF) added2025-11-12
+521,421 shares · 2024Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for ALGM →

Follow-the-investor returns

If you'd copied each holder of ALGM…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Wellington Management	2021Q2	$25.04	+59.8%	$44.3M
Ken Griffin (Citadel Advisors)	2021Q2	$26.39	+51.5%	$5.7M
Ken Griffin (Citadel Advisors)	2021Q2	$26.39	+51.5%	$5.7M
Ken Griffin (Citadel Advisors)	2021Q2	$26.39	+51.5%	$5.7M
Steve Cohen (Point72)	2020Q4	$26.42	+51.4%	$44.8M
Steve Cohen (Point72)	2020Q4	$26.42	+51.4%	$44.8M
Steve Cohen (Point72)	2020Q4	$26.42	+51.4%	$44.8M
Izzy Englander (Millennium Mgmt)	2020Q4	$26.53	+50.8%	$1.1M
Izzy Englander (Millennium Mgmt)	2020Q4	$26.53	+50.8%	$1.1M
Izzy Englander (Millennium Mgmt)	2020Q4	$26.53	+50.8%	$1.1M
Renaissance Technologies	2022Q1	$27.16	+47.3%	$17.4M
T. Rowe Price	2022Q4	$28.42	+40.7%	$4.1M
Paul Tudor Jones (Tudor Investment)	2022Q3	$28.74	+39.2%	$1.0M
AQR Capital Management	2022Q1	$29.03	+37.8%	$13.1M
Two Sigma Investments	2020Q4	$29.94	+33.6%	$12.4M
D.E. Shaw & Co.	2021Q2	$33.55	+19.2%	$2.2M
Norges Bank (Norway SWF)	2020Q4	$2843.21	-98.6%	$58.3M

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions4

Norges Bank (Norway SWF)
+1,457,805
$38.5M
Renaissance Technologies
+436,200
$11.5M
D.E. Shaw & Co.
+55,304
$1.5M
Paul Tudor Jones (Tudor Investment)
+25,665
$677K

Added to6

Ken Griffin (Citadel Advisors)
+2,228,889
$58.8M
Izzy Englander (Millennium Mgmt)
+539,113
$14.2M
Two Sigma Investments
+149,577
$3.9M
Steve Cohen (Point72)
+132,465
$3.5M
AQR Capital Management
+77,589
$2.0M
T. Rowe Price
+4,736
$125

Trimmed1

Wellington Management
−54,580
$1.4M

Exited0

—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	11	5,659,160	$9.24B	—
2022Q2	13	6,609,590	$8.13B	+2
2022Q3	12	6,837,417	$149.4M	-1
2022Q4	12	10,918,348	$327.7M	—
2023Q1	16	11,451,676	$549.5M	+4
2023Q2	14	11,649,638	$525.8M	-2
2023Q3	14	10,190,521	$325.5M	—
2023Q4	13	10,053,869	$304.3M	-1
2024Q1	12	11,454,278	$308.8M	-1
2024Q2	12	9,967,707	$281.5M	—
2024Q3	10	8,127,933	$189.4M	-2
2024Q4	10	6,035,413	$131.9M	—
2025Q1	9	10,329,225	$259.6M	-1
2025Q2	17	7,828,346	$267.6M	+8
2025Q3	11	4,081,336	$119.2M	-6
2025Q4	17	9,100,499	$240.1M	+6

Who owns ALGM

17 super-investors · 2025Q4

Tracked stake

9.10M

Combined value

$240M

% of shares outstanding

—

shares-out unknown

Quarter action mix

New4Added12Trim1

#	Manager	Shares	Value	% of book	Last action
1	Ken Griffin Citadel Advisors	2.56M	$68M	0.0%	Added+2.23M
2	Norges Bank Norway SWF	1.46M	$38M	0.0%	New+1.46M
3	Izzy Englander Millennium Mgmt	1.34M	$35M	0.0%	Added+539.1K
4	Steve Cohen Point72	1.12M	$30M	0.0%	Added+132.5K
5	Wellington Management	1.11M	$29M	0.0%	Trim−54.6K
6	Renaissance Technologies	436.2K	$12M	0.0%	New+436.2K
7	AQR Capital Management	328.0K	$9M	0.0%	Added+77.6K
8	Two Sigma Investments	310.9K	$8M	0.0%	Added+149.6K
9	Ken Griffin Citadel Advisors	142.9K	$4M	0.0%	Added+2.23M
10	T. Rowe Price	101.4K	$3M	0.0%	Added+4.7K
11	D.E. Shaw & Co.	55.3K	$1M	0.0%	New+55.3K
12	Izzy Englander Millennium Mgmt	43.8K	$1M	0.0%	Added+539.1K
13	Izzy Englander Millennium Mgmt	27.8K	$733K	0.0%	Added+539.1K
14	Paul Tudor Jones Tudor Investment	25.7K	$677K	0.0%	New+25.7K
15	Steve Cohen Point72	16.2K	$427K	0.0%	Added+132.5K
16	Steve Cohen Point72	14.5K	$383K	0.0%	Added+132.5K
17	Ken Griffin Citadel Advisors	12.2K	$322K	0.0%	Added+2.23M

Recent moves

20 transactions

NEWPaul Tudor Jones (Tudor Investment)
+25,665 · 2025Q4
ADDAQR Capital Management
+77,589 · 2025Q4
ADDKen Griffin (Citadel Advisors)
+2,228,889 · 2025Q4
TRIMWellington Management
−54,580 · 2025Q4
ADDIzzy Englander (Millennium Mgmt)
+539,113 · 2025Q4
ADDSteve Cohen (Point72)
+132,465 · 2025Q4
NEWD.E. Shaw & Co.
+55,304 · 2025Q4
ADDT. Rowe Price
+4,736 · 2025Q4
ADDTwo Sigma Investments
+149,577 · 2025Q4
NEWRenaissance Technologies
+436,200 · 2025Q4
NEWNorges Bank (Norway SWF)
+1,457,805 · 2025Q4
ADDSteve Cohen (Point72)
+692,245 · 2025Q3
TRIMWellington Management
−1,475,922 · 2025Q3
TRIMTwo Sigma Investments
−185,458 · 2025Q3
ADDAQR Capital Management
+229,655 · 2025Q3
ADDIzzy Englander (Millennium Mgmt)
+123,008 · 2025Q3
ADDT. Rowe Price
+7,303 · 2025Q3
SOLDNorges Bank (Norway SWF)
−1,407,943 · 2025Q3
SOLDRay Dalio (Bridgewater Associates)
−77,321 · 2025Q3
ADDNorges Bank (Norway SWF)
+521,421 · 2024Q3

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