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Mountaineer Partners Management’s Builders FirstSource BLDR Stock Holding History

Mountaineer Partners Management’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
Q2 		– Sell
-98,203
Closed -$8.09M – 12
2026
Q1 		$8.09M Buy
98,203
+4,112
+4% +$439K 4.02% 13
2025
Q4 		$9.68M Buy
94,091
+33,332
+55% +$3.75M 5.42% 10
2025
Q3 		$7.37M Sell
60,759
-1,705
-3% -$226K 4.28% 12
2025
Q2 		$7.29M Buy
62,464
+4,253
+7% +$491K 4.82% 13
2025
Q1 		$7.27M Buy
58,211
+2,336
+4% +$340K 6.96% 9
2024
Q4 		$7.99M Hold
55,875
– – 5.85% 11
2024
Q3 		$10.8M Buy
+55,875
New +$9.27M 6.75% 5
2021
Q1 		– Sell
-250,327
Closed -$10.2M – 17
2020
Q4 		$10.2M Sell
250,327
-47,540
-16% -$1.68M 7.33% 2
2020
Q3 		$9.72M Buy
297,867
+28,600
+11% +$776K 8.39% 2
2020
Q2 		$5.57M Sell
269,267
-3,000
-1% -$54.2K 7.48% 5
2020
Q1 		$3.33M Sell
272,267
-50,233
-16% -$1.13M 4.74% 8
2019
Q4 		$8.19M Sell
322,500
-43,800
-12% -$1.05M 9.12% 5
2019
Q3 		$7.54M Sell
366,300
-145,000
-28% -$2.7M 7.59% 7
2019
Q2 		$8.62M Sell
511,300
-26,800
-5% -$401K 3.98% 11
2019
Q1 		$7.18M Buy
538,100
+11,500
+2% +$151K 6.13% 11
2018
Q4 		$5.75M Buy
+526,600
New +$6.62M 4.89% 11

Other funds holding BLDR

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Capital International Investors
Capital International Investors Los Angeles, California $484B AUM 34.9% 1-Year Est. Return
Pictet Asset Management
Pictet Asset Management Carouge, Switzerland $105B AUM 38.07% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Mountaineer Partners Management's BLDR Position: Q2 2026 in Review

Mountaineer Partners Management sold out of Builders FirstSource (BLDR) in Q2 2026, closing a stake of 98,203 shares — an estimated $8.09M sold.

Mountaineer Partners Management first reported a position in BLDR in Q4 2018 and held it in 16 quarters. The position peaked at $10.8M in Q3 2024. 671 funds tracked by Wall St. Rank hold BLDR as of Q2 2026.

  • Mountaineer Partners Management reported no remaining Builders FirstSource position as of Q2 2026 after selling out during the quarter.
  • Mountaineer Partners Management sold 98,203 Builders FirstSource shares in Q2 2026, an estimated $8.09M.
  • Mountaineer Partners Management first reported a position in Builders FirstSource in Q4 2018 and held it in 16 quarters.
  • Mountaineer Partners Management's Builders FirstSource position peaked at $10.8M in Q3 2024.
  • 671 funds tracked by Wall St. Rank held Builders FirstSource as of Q2 2026.

Based on Mountaineer Partners Management's 13F filing for Q2 2026, filed 13 Aug 2026.