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Builders FirstSource

719 hedge funds and large institutions have $8.74B invested in Builders FirstSource in 2026 Q1 according to their latest regulatory filings, with 104 funds opening new positions, 274 increasing their positions, 239 reducing their positions, and 135 closing their positions.

New
Increased
Maintained
Reduced
Closed

more call options, than puts

Call options by funds: $ | Put options by funds: $

more repeat investments, than reductions

Existing positions increased: | Existing positions reduced:

more ownership

Funds ownership:

more funds holding in top 10

Funds holding in top 10:

6% less funds holding

Funds holding: 765719 (-46)

19% less capital invested

Capital invested by funds: $10.8B → $8.74B (-$2.09B)

23% less first-time investments, than exits

New positions opened: 104 | Existing positions closed: 135

Holders
719
Holders Change
Holders Change %
% of All Funds
Holding in Top 10
13
Holding in Top 10 Change
Holding in Top 10 Change %
% of All Funds
New
Increased
Reduced
Closed
Calls
$178M
Puts
$111M
Net Calls
Net Calls Change

Top Sellers

1 -$236M
2 -$180M
3 -$175M
4
Citadel Advisors
Citadel Advisors
Florida
-$79.4M
5
AssetMark Inc
AssetMark Inc
California
-$61.2M
Name Holding Trade Value Shares
Change
Change in
Stake
RP
126
RIHO Partners
Arizona
$8.18M
IMRF
127
Illinois Municipal Retirement Fund
Illinois
$8.18M
MPM
128
Mountaineer Partners Management
New York
$8.09M
AIM
129
Achmea Investment Management
Netherlands
$8.07M
IHL
130
Investment House LLC
California
$7.9M
TCAM
131
Turtle Creek Asset Management
Ontario, Canada
$7.82M
Rafferty Asset Management
132
Rafferty Asset Management
New York
$7.69M
GC
133
Giverny Capital
Quebec, Canada
$7.56M
PL
134
Parkwood LLC
Ohio
$7.53M
State of Wisconsin Investment Board
135
State of Wisconsin Investment Board
Wisconsin
$7.46M
Robeco Institutional Asset Management
136
Robeco Institutional Asset Management
Netherlands
$7.34M
New York State Teachers Retirement System (NYSTRS)
137
New York State Teachers Retirement System (NYSTRS)
New York
$7.27M
PCMI
138
Paradigm Capital Management Inc
New York
$7.06M
DLP
139
De Lisle Partners
United Kingdom
$6.96M
WCM
140
Wedge Capital Management
North Carolina
$6.93M
WT
141
Whittier Trust
California
$6.8M
Aviva
142
Aviva
United Kingdom
$6.7M
Thrivent Financial for Lutherans
143
Thrivent Financial for Lutherans
Minnesota
$6.62M
Manulife (Manufacturers Life Insurance)
144
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$6.59M
6CM
145
683 Capital Management
New York
$6.59M
OSAM
146
O'Shaughnessy Asset Management
Connecticut
$6.38M
AF
147
Atlas FRM
Connecticut
$6.34M
Russell Investments Group
148
Russell Investments Group
United Kingdom
$6.05M
RA
149
Royce & Associates
New York
$6.02M
MLL
150
Moody Lynn & Lieberson
Massachusetts
$5.94M