Hudson Bay Capital Management
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Hudson Bay Capital Management’s Builders FirstSource BLDR Stock Holding History

Hudson Bay Capital 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
Q1 		$3.32M Buy
40,363
+15,000
+59% +$1.6M 0.01% 633
2025
Q4 		$2.61M Sell
25,363
-30,783
-55% -$3.46M 0.01% 655
2025
Q3 		$6.81M Buy
56,146
+647
+1% +$85.8K 0.02% 462
2025
Q2 		$6.48M Sell
55,499
-75,742
-58% -$8.74M 0.02% 485
2025
Q1 		$16.4M Buy
131,241
+60,144
+85% +$8.75M 0.05% 296
2024
Q4 		$10.2M Buy
71,097
+14,597
+26% +$2.58M 0.04% 363
2024
Q3 		$11M Sell
56,500
-3,240
-5% -$537K 0.04% 266
2024
Q2 		$8.27M Buy
59,740
+7,500
+14% +$1.27M 0.04% 267
2024
Q1 		$10.9M Sell
52,240
-13,500
-21% -$2.49M 0.06% 167
2023
Q4 		$11M Buy
65,740
+40,840
+164% +$5.43M 0.07% 167
2023
Q3 		$3.1M Sell
24,900
-5,100
-17% -$704K 0.02% 398
2023
Q2 		$4.08M Buy
+30,000
New +$3.34M 0.03% 354
2022
Q3 		– Sell
-25,000
Closed -$1.34M – 1236
2022
Q2 		$1.34M Buy
+25,000
New +$1.53M 0.01% 881
2022
Q1 		– Sell
-32,742
Closed -$2.81M – 1200
2021
Q4 		$2.81M Sell
32,742
-89,110
-73% -$6.04M 0.03% 576
2021
Q3 		$6.3M Sell
121,852
-50,148
-29% -$2.45M 0.09% 258
2021
Q2 		$7.34M Buy
172,000
+152,000
+760% +$7.05M 0.09% 214
2021
Q1 		$927K Buy
+20,000
New +$851K 0.01% 694
2017
Q4 		– Sell
-64,191
Closed -$1.16M – 493
2017
Q3 		$1.16M Buy
+64,191
New +$1.04M 0.03% 289
2016
Q4 		– Sell
-65,013
Closed -$748K – 629
2016
Q3 		$748K Sell
65,013
-49,723
-43% -$626K 0.02% 331
2016
Q2 		$1.29M Buy
+114,736
New +$1.32M 0.04% 225
2015
Q4 		– Sell
-298,280
Closed -$3.78M – 187
2015
Q3 		$3.78M Sell
298,280
-640,440
-68% -$9.1M 0.16% 93
2015
Q2 		$12.1M Buy
+938,720
New +$11.5M 0.36% 60

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

Hudson Bay Capital Management's BLDR Position: Q1 2026 in Review

Hudson Bay Capital Management increased its Builders FirstSource (BLDR) stake by 59% in Q1 2026, buying an estimated $1.6M and bringing the position to 40,363 shares worth $3.32M. The position accounts for 0.01% of the portfolio, ranked #633.

Hudson Bay Capital Management first reported a position in BLDR in Q2 2015 and has held it in 22 quarters since. The position peaked at $16.4M in Q1 2025. 719 funds tracked by Wall St. Rank hold BLDR as of Q1 2026.

  • Hudson Bay Capital Management held 40,363 shares of Builders FirstSource worth $3.32M as of Q1 2026.
  • Hudson Bay Capital Management bought 15,000 Builders FirstSource shares in Q1 2026, an estimated $1.6M.
  • Builders FirstSource made up 0.01% of Hudson Bay Capital Management's portfolio in Q1 2026, its #633 holding.
  • Hudson Bay Capital Management first reported a position in Builders FirstSource in Q2 2015 and has held it in 22 quarters since.
  • Hudson Bay Capital Management's Builders FirstSource position peaked at $16.4M in Q1 2025.
  • 719 funds tracked by Wall St. Rank held Builders FirstSource as of Q1 2026.

Based on Hudson Bay Capital Management's 13F filing for Q1 2026, filed 13 May 2026.