William Blair & Company
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William Blair & Company’s Mine Safety MSA Stock Holding History

William Blair & Company’s Portfolio MSA Stock Details MSA Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$318K Buy
1,824
+448
+33% +$75K ﹤0.01% 1394
2026
Q1 		$226K Buy
1,376
+68
+5% +$12.4K ﹤0.01% 1436
2025
Q4 		$209K Buy
+1,308
New +$213K ﹤0.01% 1448
2024
Q4 		– Sell
-1,420
Closed -$252K – 1860
2024
Q3 		$252K Buy
+1,420
New +$258K ﹤0.01% 1351

Other funds holding MSA

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
RCG
Ruane, Cunniff & Goldfarb New York $6.43B AUM 18.44% 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
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
CB
Cooke & Bieler Philadelphia, Pennsylvania $8.65B AUM 9.66% 1-Year Est. Return
FMI
Fiduciary Management Inc Milwaukee, Wisconsin $7.03B AUM 11.68% 1-Year Est. Return
MGP
M&G plc London, United Kingdom $20.1B AUM 16.62% 1-Year Est. Return

William Blair & Company's MSA Position: Q2 2026 in Review

William Blair & Company increased its Mine Safety (MSA) stake by 33% in Q2 2026, buying an estimated $75K and bringing the position to 1,824 shares worth $318K. The position accounts for ﹤0.01% of the portfolio, ranked #1394.

William Blair & Company first reported a position in MSA in Q3 2024 and has held it in 4 quarters since. 457 funds tracked by Wall St. Rank hold MSA as of Q2 2026.

  • William Blair & Company held 1,824 shares of Mine Safety worth $318K as of Q2 2026.
  • William Blair & Company bought 448 Mine Safety shares in Q2 2026, an estimated $75K.
  • Mine Safety made up ﹤0.01% of William Blair & Company's portfolio in Q2 2026, its #1394 holding.
  • William Blair & Company first reported a position in Mine Safety in Q3 2024 and has held it in 4 quarters since.
  • 457 funds tracked by Wall St. Rank held Mine Safety as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.