$ALGM

$32.32 +$0.84 (2.67%) Close

$ALGM Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 186.4M shares outstanding

Who owns ALGM?

By type of holder

Institutions 79.4% Insiders 1.2% Everyone else 19.5%

Concentration Top 10 holders own 55.5%

FMR LLC 13.7% · BlackRock, Inc. 7.5%

Institutional ownership

79.4%

+5.2 pts vs last qtr

Institutional holders

372

+49 vs last qtr

Net shares bought

+9.6M

by institutions in Q2 2026

New / sold out

98 / 49

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Invesco Ltd. +4.9M
Jpmorgan Chase & Co +4.1M

Biggest sellers in Q2 2026

FMR LLC −1.8M
Nomura Asset Management International Inc. −921.1K

Who is planning to sell?

Notices of proposed sale, last 12 months

$4.98M

12 notices from 8 people

Shares covered

120.6K

0.06% of the company

Arranged in advance

34%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Briansky Sharon Officer $1.99M
Doogue Michael Officer $1.42M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2019–FY2026

+1750.4%

+51.72% a year

Each share's claim on the business

−94.6%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$854M vs $279M

over 8 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years73% 3–5 years9% 1–3 years14% Under 1 year5%

Quarterly turnover

12.9%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ALGM on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
F FMR LLC	25.6M	13.72%	−1.8M (−6.7%)	≤2021	0.1%
Shares held by quarter Peak holding28.3M (Q3'24) Change over 8 quarters−2.7M Share of the company13.720% FMR LLC's full portfolio →
B BlackRock, Inc.	13.9M	7.45%	+1.4M (+11.2%)	≤2021	0.0%
Shares held by quarter Peak holding13.9M (Q2'26) Change over 8 quarters+1.0M Share of the company7.450% BlackRock, Inc.'s full portfolio →

FMR LLC

25.6M

% of company

13.72%

Change vs last qtr

−1.8M (−6.7%)

Held since

≤2021

BlackRock, Inc.

13.9M

% of company

7.45%

Change vs last qtr

+1.4M (+11.2%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Allegro Microsystems Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ALGM on Form N-PORT; together they hold 51.7% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
SS Select Semiconductors Portfolio Fidelity Select Portfolios	$433M	12.0M	6.41%	0.97%	August 31, 2026
SW SMALLCAP World Fund Inc SMALLCAP World Fund Inc	$383M	5.5M	2.95%	0.41%	June 30, 2026

Select Semiconductors Portfolio

Fidelity Select Portfolios

Position value

$433M

% of company

6.41%

% of the fund

0.97%

As of

August 31, 2026

SMALLCAP World Fund Inc

Position value

$383M

% of company

2.95%

% of the fund

0.41%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Allegro Microsystems Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
DM Doogue Michael Insider	663.3K	0.36%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.360% Doogue Michael's insider activity →
NV Nargolwala Vineet A Insider	356.1K	0.19%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.190% Nargolwala Vineet A's insider activity →

Doogue Michael

Insider

663.3K

% of company

0.36%

Change vs last qtr

—

Held since

—

Nargolwala Vineet A

Insider

356.1K

% of company

0.19%

Change vs last qtr

—

Held since

—

17 more holders behind a free account

See every insider and 5%+ holder of Allegro Microsystems Inc.

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