Allegro MicroSystems Ownership | Who Owns Allegro MicroSystems?

Overview Forecast RevenueFinancials Chart Transcripts

Allegro MicroSystems Ownership Summary

Allegro MicroSystems is owned by 13.33% institutional investors, 33.18% insiders, and 53.49% retail investors. Fmr is the largest institutional shareholder, holding 14.81% of ALGM shares. Fidelity Select Semiconductors is the top mutual fund, with 8.95% of its assets in Allegro MicroSystems shares.

ALGM Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Allegro MicroSystems	13.33%	33.18%	53.49%
Sector	Technology Stocks	36.77%	14.76%	48.48%
Idea	Semiconductor Stocks List	48.16%	6.95%	44.89%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Fmr	27.42M	14.81%	$864.59M
Vanguard group	14.20M	7.67%	$374.66M
Blackrock funding, inc. /de	12.49M	6.75%	$393.96M
Capital research global investors	12.44M	6.72%	$392.09M
Invesco	8.75M	4.73%	$275.93M
Jpmorgan chase	8.65M	4.67%	$242.60M
Blackrock	6.63M	3.45%	$187.36M
State street	5.23M	2.82%	$164.84M
Clearbridge investments	2.86M	1.55%	$90.29M
Geode capital management	2.46M	1.33%	$77.48M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
S squared	457.45K	5.46%	$14.42M
Lightrock netherlands b.v.	507.99K	3.42%	$16.02M
Aperture investors	709.67K	2.83%	$22.38M
Talos eurisko asset management lp	493.17K	2.66%	$15.55M
Roubaix capital	169.99K	2.50%	$5.36M
G2 investment partners management	208.57K	1.62%	$6.58M
Kettle hill capital management	181.53K	1.43%	$5.72M
Pier capital	226.57K	1.18%	$7.14M
Sirios capital management l p	298.42K	1.14%	$9.41M
Sphera management technology funds	57.15K	1.01%	$1.80M

Top Buyers

Holder	Shares	% Assets	Change
Fmr	27.42M	0.05%	3.79M
Norges bank	1.46M	0.00%	1.46M
Jpmorgan chase	8.65M	0.02%	1.30M
Invesco	8.75M	0.04%	1.10M
Kennedy capital management	910.04K	0.61%	865.18K

Top Sellers

Holder	Shares	% Assets	Change
Macquarie group	-	-	-2.20M
Citadel advisors	399.44K	0.00%	-2.16M
Analog century management lp	-	-	-1.89M
Artisan partners limited partnership	-	-	-1.43M
Adage capital partners gp	1.46M	0.07%	-1.34M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	1.46M	0.00%	1.46M	$38.46M
Vanguard fiduciary trust	765.89K	0.01%	765.89K	$24.15M
Aperture investors	709.67K	2.83%	709.67K	$22.38M
Lord, abbett	530.46K	0.05%	530.46K	$16.73M
Scout investments	389.39K	0.30%	389.39K	$11.00M

Sold Out

Holder	Change
Financial gravity asset management	-1.00
Jfs wealth advisors	-1.00
Claris advisors, llc / mo /	-2.00
Bay harbor wealth management	-3.00
Eastern bank	-3.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2026	156	-49.84%	24,676,223	-81.93%	13	0.25%	89	-33.58%	37	-69.42%
Dec 31, 2025	93	-70.48%	18,824,783	-86.15%	10	0.19%	31	-78.91%	41	-62.04%
Sep 30, 2025	113	-61.17%	29,584,099	-78.76%	16	0.28%	45	-70.20%	45	-54.55%
Jun 30, 2025	297	-4.81%	145,898,259	-6.38%	79	1.10%	152	-13.64%	101	27.85%
Mar 31, 2025	313	12.59%	156,307,245	9.92%	84	1.42%	176	35.38%	81	-27.03%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Fidelity Select Semiconductors	16.58M	8.95%	187.00K
American Funds Capital World Gr&Inc A	5.93M	3.20%	-
Capital Group World Growth & Inc Cmp	5.93M	3.20%	-
American Funds SMALLCAP World A	5.65M	3.05%	-608.03K
iShares Core S&P Mid-Cap ETF	4.19M	2.26%	-2.11K
Vanguard US Total Market Shares ETF	4.00M	2.17%	890.47K
Vanguard Total Stock Mkt Idx Inv	3.84M	2.07%	20.51K
Invesco Small Cap Value A	3.47M	1.87%	-1.87M
Vanguard Information Technology ETF	3.11M	1.68%	-3.53K
Vanguard Small Cap Index	2.78M	1.50%	48.56K

Recent Insider Transactions

Date	Name	Role	Activity	Value
May 18, 2026	Kent Ian	SVP, Global Operations	Sell	$109.80K
May 14, 2026	Lynch Susan D	-	Sell	$759.63K
May 11, 2026	Briansky Sharon	SVP, GC and Secretary	Sell	$425.38K
May 11, 2026	Doogue Michael	President and CEO	Sell	$1.42M
Mar 02, 2026	Briansky Sharon	SVP, GC and Secretary	Sell	$340.44K

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	-	4
2026 Q1	-	3
2025 Q4	-	1
2025 Q3	-	3
2025 Q2	-	2

ALGM Ownership FAQ

Who owns the most shares of Allegro MicroSystems?

Allegro MicroSystems’s largest shareholders are Fmr (27.42M shares, 14.81%), Vanguard group (14.2M shares, 7.67%), and Blackrock funding, inc. /de (12.49M shares, 6.75%). Together, they hold 29.23% of Allegro MicroSystems’s total shares outstanding.

Does Blackrock own Allegro MicroSystems?

Yes, BlackRock owns 3.45% of Allegro MicroSystems, totaling 6.63M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 187.36M$. In the last quarter, BlackRock decreased its holdings by -143K shares, a -2.11% change.

Who is Allegro MicroSystems’s biggest shareholder by percentage of total assets invested?

S squared is Allegro MicroSystems’s biggest shareholder by percentage of total assets invested, with 5.46% of its assets in 457.45K Allegro MicroSystems shares, valued at 14.42M$.

Who is the top mutual fund holder of Allegro MicroSystems shares?

Fidelity Select Semiconductors is the top mutual fund holder of Allegro MicroSystems shares, with 8.95% of its total shares outstanding invested in 16.58M Allegro MicroSystems shares.

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