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Schedule 13G/A

ALGM Schedule 13G/A filing by Capital Research Global Investors

Capital Research Global Investors reported beneficial ownership of 185.1M shares, representing 12% of ALLEGRO MICROSYSTEMS, INC. in this filing.

FiledFeb 12, 2026
Ownership dateDec 31, 2025
Reported shares185.1M
Reported ownership12%
Ownership details

Voting and dispositive power reported in the filing

These figures describe the reporting filer’s disclosed voting and investment authority. They should be read together with the reported share count and percentage.

Sole voting power 13.1M
Shared voting power 13.1M
Sole dispositive power 13.1M
Shared dispositive power 13.1M
Compared with the prior filing

How the reported position changed

This compares the current filing with the previous tracked Schedule 13 filing from the same reporting CIK for ALGM. A change between filings does not by itself establish when shares were bought or sold.

Previous filingAug 13, 2025
Reported share change+193,650
Ownership percentage change0 pts
Previous filingThis filing
Reported shares184.9M185.1M
Reported ownership12%12%
Price context

Price dates alongside the ownership filing

Price data provides market context around the disclosure. It does not identify the filer’s actual transaction price.

Close near filing date$41.83as of Feb 12, 2026
Latest tracked price$42.01as of Aug 5, 2026
Source

Original filing and accession

Use the SEC filing as the primary source when you need the complete disclosure, footnotes, exhibits, or reporting-person details.

Reporting filer
Capital Research Global Investors
CIK
CIK0001422848
Accession
0001422848-26-000011
Form
Schedule 13G/A
Read the filing in context

Understand what a Schedule 13 filing does—and does not—tell you.