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Schedule 13G/A

BLDR Schedule 13G/A filing by BlackRock

BlackRock reported beneficial ownership of 12.9M shares, representing 12% of Builders FirstSource, Inc. in this filing.

FiledOct 5, 2026
Ownership dateSep 30, 2026
Reported shares12.9M
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 12.6M
Shared voting power 0
Sole dispositive power 12.9M
Shared dispositive power 0
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 BLDR. A change between filings does not by itself establish when shares were bought or sold.

Previous filingApr 17, 2025
Reported share change+4,425,341
Ownership percentage change+4.5 pts
Previous filingThis filing
Reported shares8.5M12.9M
Reported ownership7.5%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$56.25as of Oct 2, 2026
Latest stored close$52.85as of Oct 9, 2026View live quote ↗
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
BlackRock
CIK
CIK0002012383
Accession
0002012383-26-003316
Form
Schedule 13G/A
Read the filing in context

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