William Blair & Company
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William Blair & Company’s MP Materials MP Stock Holding History

William Blair & Company’s Portfolio MP Stock Details MP Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$603K Sell
12,491
-1,618
-11% -$96.8K ﹤0.01% 1089
2025
Q4 		$713K Buy
14,109
+1,516
+12% +$96.1K ﹤0.01% 1025
2025
Q3 		$845K Buy
12,593
+5,719
+83% +$360K ﹤0.01% 961
2025
Q2 		$229K Buy
+6,874
New +$175K ﹤0.01% 1368
2025
Q1 		– Sell
-13,632
Closed -$213K – 1851
2024
Q4 		$213K Sell
13,632
-16,050
-54% -$298K ﹤0.01% 1418
2024
Q3 		$524K Hold
29,682
– – ﹤0.01% 1101
2024
Q2 		$378K Sell
29,682
-4,200
-12% -$65.9K ﹤0.01% 1190
2024
Q1 		$485K Sell
33,882
-20,842
-38% -$330K ﹤0.01% 1093
2023
Q4 		$1.09M Buy
54,724
+2,000
+4% +$34.1K ﹤0.01% 831
2023
Q3 		$1.01M Sell
52,724
-20,000
-28% -$444K ﹤0.01% 831
2023
Q2 		$1.66M Buy
72,724
+65,004
+842% +$1.49M 0.01% 708
2023
Q1 		$218K Sell
7,720
-6,369
-45% -$193K ﹤0.01% 1371
2022
Q4 		$342K Buy
14,089
+250
+2% +$7.58K ﹤0.01% 1173
2022
Q3 		$378K Buy
+13,839
New +$452K ﹤0.01% 1135

Other funds holding MP

HP
Hancock Prospecting West Perth, Australia $3.33B AUM 65.96% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
VanEck Associates
VanEck Associates New York $133B AUM 72.99% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return

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

William Blair & Company reduced its MP Materials (MP) stake by 11% in Q1 2026, selling an estimated $96.8K and leaving 12,491 shares worth $603K. The position accounts for ﹤0.01% of the portfolio, ranked #1089.

William Blair & Company first reported a position in MP in Q3 2022 and has held it in 14 quarters since. The position peaked at $1.66M in Q2 2023. 712 funds tracked by Wall St. Rank hold MP as of Q1 2026.

  • William Blair & Company held 12,491 shares of MP Materials worth $603K as of Q1 2026.
  • William Blair & Company sold 1,618 MP Materials shares in Q1 2026, an estimated $96.8K.
  • MP Materials made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #1089 holding.
  • William Blair & Company first reported a position in MP Materials in Q3 2022 and has held it in 14 quarters since.
  • William Blair & Company's MP Materials position peaked at $1.66M in Q2 2023.
  • 712 funds tracked by Wall St. Rank held MP Materials as of Q1 2026.

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