BUILDERS FIRSTSOURCE INC

BLDR

Institutions

Combined AUM (Q2 2026)

$39.6M

Combined Shares (Q2 2026)

443,000

Overall Trend

Increase

All institutions combined

Basis: holder count and combined value / shares merge all share classes of the same company (e.g. Class A / C); each institution is counted once, and value & shares are the sum across classes.

📥 Inflow (Q1 2026→Q2 2026)

+33,000

4 institutions added · 1 new buys

Est. buy amount ≈ —

📤 Outflow (Q1 2026→Q2 2026)

-3,800

2 institutions reduced · 2 exits

Est. sell amount ≈ —

⚖️ Net Share Change

+29,200

—

Net Buy

💰 Est. Net Value

≈ —

—

est. price —

⏳

Latest AUM (Q2 2026)

$39.6M

Institutions

New Buys

Adds

Reduces

Exits

Unchanged

	Portfolio %	Prev Q %	Rank	Q2 2026 Value	Q2 2026 Shares	Prev Q Value	Prev Q Shares	Shares Change	Action
IMC-Chicago, LLC	0.01%	0.01%	#2	$29.0M	324,100	$25.8M	313,200	+10,900+3.48%	Add
GROUP ONE TRADING LLC	0.01%	0.01%	#1	$5.5M	61,500	$4.1M	49,400	+12,100+24.49%	Add
SIMPLEX TRADING, LLC	<0.01%	<0.01%	#4	$5.1M	56,900	$3.9M	47,400	+9,500+20.04%	Add
SUMMIT SECURITIES GROUP LLC	<0.01%	—	#3	$44,740	500	$0	0	+500	New Buy

🧭 Institutional Sector Flow Heatmap

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Net Outflow Net Inflow