William Blair & Company
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William Blair & Company’s Builders FirstSource BLDR Stock Holding History

William Blair & Company’s Portfolio BLDR Stock Details BLDR Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$1.11M Buy
+13,450
New +$1.44M ﹤0.01% 912
2025
Q1 		– Sell
-1,401
Closed -$200K – 1811
2024
Q4 		$200K Buy
1,401
+40
+3% +$7.08K ﹤0.01% 1440
2024
Q3 		$264K Sell
1,361
-4,209
-76% -$698K ﹤0.01% 1335
2024
Q2 		$771K Buy
5,570
+598
+12% +$102K ﹤0.01% 959
2024
Q1 		$1.04M Sell
4,972
-172
-3% -$31.8K ﹤0.01% 853
2023
Q4 		$859K Sell
5,144
-1,675
-25% -$223K ﹤0.01% 903
2023
Q3 		$849K Sell
6,819
-3,837
-36% -$529K ﹤0.01% 893
2023
Q2 		$1.45M Sell
10,656
-3,983
-27% -$443K 0.01% 735
2023
Q1 		$1.3M Sell
14,639
-784
-5% -$62.1K 0.01% 763
2022
Q4 		$1M Sell
15,423
-1,732
-10% -$108K ﹤0.01% 820
2022
Q3 		$1.01M Sell
17,155
-163
-0.9% -$10.2K ﹤0.01% 812
2022
Q2 		$930K Sell
17,318
-3,726
-18% -$228K ﹤0.01% 871
2022
Q1 		$1.36M Sell
21,044
-1,006
-5% -$73K ﹤0.01% 813
2021
Q4 		$1.89M Sell
22,050
-3,175
-13% -$215K 0.01% 745
2021
Q3 		$1.3M Buy
25,225
+460
+2% +$22.5K ﹤0.01% 820
2021
Q2 		$1.06M Buy
24,765
+8,325
+51% +$386K ﹤0.01% 900
2021
Q1 		$762K Sell
16,440
-513
-3% -$21.8K ﹤0.01% 986
2020
Q4 		$692K Buy
16,953
+5,942
+54% +$210K ﹤0.01% 985
2020
Q3 		$359K Buy
+11,011
New +$299K ﹤0.01% 1068

Other funds holding BLDR

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
Capital International Investors
Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Sands Capital Management
Sands Capital Management Arlington, Virginia $25.5B AUM 26.46% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

William Blair & Company's BLDR Position: Q1 2026 in Review

William Blair & Company opened a new position in Builders FirstSource (BLDR) in Q1 2026: 13,450 shares worth $1.11M. The stake represents ﹤0.01% of the portfolio and ranks #912 among its holdings. This is a return to the name: William Blair & Company previously reported a position in BLDR as recently as Q4 2024.

William Blair & Company first reported a position in BLDR in Q3 2020 and has held it in 19 quarters since. The position peaked at $1.89M in Q4 2021. 721 funds tracked by Wall St. Rank hold BLDR as of Q1 2026.

  • William Blair & Company held 13,450 shares of Builders FirstSource worth $1.11M as of Q1 2026.
  • Builders FirstSource was a new William Blair & Company position in Q1 2026.
  • Builders FirstSource made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #912 holding.
  • William Blair & Company first reported a position in Builders FirstSource in Q3 2020 and has held it in 19 quarters since.
  • William Blair & Company's Builders FirstSource position peaked at $1.89M in Q4 2021.
  • 721 funds tracked by Wall St. Rank held Builders FirstSource as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.