Builders FirstSource ($BLDR) Insider Trading & Smart Money Activity

Builders FirstSource, Inc. · Building Products & Equipment · Latest filing Oct 15, 2026

Builders FirstSource, Inc. ($BLDR) has 1 insider trade and 14 13F position changes on file. Insiders filed 1 Form 4 transaction in the last 12 months, none of them open-market purchases or sales.

Insider buyers (12 mo)

0

Insider sellers (12 mo)

0

Net insider $ (12 mo)

$0

Congress trades (12 mo)

0

13F moves on file

14

Analyst ratings on file

0

BLDR insider buying and selling by quarter

Quarter	Insider buys	Insider sales	Congress buys / sales	13F added / cut
Q1 2026	0	0	0 / 0	0 / 0
Q2 2026	0	0	0 / 0	11 / 1
Q3 2026	0	0	0 / 0	0 / 0
Q4 2026	0	0	0 / 0	1 / 1

Insider buys and sales count open-market trades only (Form 4 codes P and S). Grants, option exercises and tax withholding are left out.

All BLDR insider, congress, 13F and analyst activity

All Insiders 13F

Date	Source	Who	Action	Shares	Value / amount	ΔOwn	1W	1M	6M	Filing	Story
Oct 15, 2026	13F	V-Square Quantitative Management	Sold out	-3.96K sh							—
Oct 14, 2026	13F	Mather Group	Added	+56.80K sh	$5.20M						—
Jun 13, 2026	Insider	Gayatri NarayanPresident - Tech & Digital	Sell (Tax withholding)	2.84K sh	$221.02K		-0.6%	-5.5%			—
May 15, 2026	13F	Verition Fund Management	Added	+29.07K sh	$20.44M		+5.3%	+10.5%			Read
May 15, 2026	13F	Schonfeld Strategic Advisors	Added	+120.63K sh	$24.49M		+5.3%	+10.5%			Read
May 15, 2026	13F	Mirae Asset Global Etfs Holdings	Added	+29.25K sh	$73.61M		+5.3%	+10.5%			—
May 15, 2026	13F	Mirae Asset Global Etfs Holdings	Added	+29.25K sh	$64.63M		+5.3%	+10.5%			—
May 15, 2026	13F	Marshall Wace	Added	+620.26K sh	$69.45M		+5.3%	+10.5%			—
May 15, 2026	13F	Marshall Wace	Added	+620.26K sh	$60.98M		+5.3%	+10.5%			—
May 15, 2026	13F	Focus Partners Wealth	Added	+970.55K sh	$148.82M		+5.3%	+10.5%			—
May 15, 2026	13F	Focus Partners Wealth	Added	+970.55K sh	$130.68M		+5.3%	+10.5%			—
May 15, 2026	13F	Cerity Partners	Added	+74.13K sh	$23.50M		+5.3%	+10.5%			Read
May 8, 2026	13F	Sands Capital Management	Reduced	-136.88K sh	$234.53M		-9.0%	-5.5%			—
May 6, 2026	13F	Bessemer Group	Added	+27.04K sh	$47.25M		-9.6%	-8.0%			—
May 6, 2026	13F	Bessemer Group	Added	+27.04K sh	$41.49M		-9.6%	-8.0%			—

1W / 1M / 6M = how BLDR moved from the trade or filing date.

Insider trading in BLDR: who is buying and selling

Insider	Role	Trades	Open-market net	Shares held	Last trade
Gayatri Narayan	President - Tech & Digital	1	—		Jun 13, 2026

Institutions moving BLDR (13F)

• Mirae Asset Global Etfs Holdings2
• Marshall Wace2
• Focus Partners Wealth2
• Bessemer Group2
• V-Square Quantitative Management1
• Mather Group1
• Verition Fund Management1
• Schonfeld Strategic Advisors1
• Cerity Partners1
• Sands Capital Management1

Frequently asked questions

What is the latest insider trade in BLDR?

Gayatri Narayan, President - Tech & Digital filed a sell (tax withholding) of 2.84K sh worth $221.02K on Jun 13, 2026.

Which institutions changed their BLDR positions?

Recent 13F filers moving the stock include Mirae Asset Global Etfs Holdings, Marshall Wace, Focus Partners Wealth, Bessemer Group and V-Square Quantitative Management.

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Data comes from public SEC Form 4 and 13F filings and STOCK Act disclosures. Dates are the trade or filing date reported. This page is for research only and is not investment advice.