William Blair Investment Management
THR

William Blair Investment Management’s Thermon Group Holdings THR Stock Holding History

William Blair Investment Management’s Portfolio THR Stock Details THR Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$32.6M Sell
647,539
-239,912
-27% -$11.2M 0.11% 176
2025
Q4 		$33M Sell
887,451
-92,897
-9% -$3.05M 0.09% 188
2025
Q3 		$26.2M Sell
980,348
-59,447
-6% -$1.6M 0.07% 249
2025
Q2 		$29.2M Sell
1,039,795
-82,523
-7% -$2.24M 0.08% 218
2025
Q1 		$31.3M Buy
1,122,318
+264,685
+31% +$7.66M 0.09% 212
2024
Q4 		$24.7M Buy
857,633
+6,821
+0.8% +$201K 0.06% 286
2024
Q3 		$25.4M Buy
850,812
+5,816
+0.7% +$175K 0.06% 271
2024
Q2 		$26M Sell
844,996
-56,248
-6% -$1.8M 0.07% 258
2024
Q1 		$29.5M Buy
901,244
+163,640
+22% +$4.81M 0.08% 246
2023
Q4 		$24M Sell
737,604
-92
-0% -$2.74K 0.07% 267
2023
Q3 		$20.3M Sell
737,696
-33,545
-4% -$900K 0.07% 273
2023
Q2 		$20.5M Buy
+771,241
New +$17.9M 0.07% 278

Other funds holding THR

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
MVP
Medina Value Partners Los Angeles, California $477M AUM 25.52% 1-Year Est. Return
GKIM
GW&K Investment Management Boston, Massachusetts $11.3B AUM 31.98% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
WHG
Westwood Holdings Group Dallas, Texas $13.7B AUM 21.48% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

William Blair Investment Management's THR Position: Q1 2026 in Review

William Blair Investment Management reduced its Thermon Group Holdings (THR) stake by 27% in Q1 2026, selling an estimated $11.2M and leaving 647,539 shares worth $32.6M. The position accounts for 0.11% of the portfolio, ranked #176.

William Blair Investment Management first reported a position in THR in Q2 2023 and has held it in 12 quarters since. The position peaked at $33M in Q4 2025. 215 funds tracked by Wall St. Rank hold THR as of Q1 2026.

  • William Blair Investment Management held 647,539 shares of Thermon Group Holdings worth $32.6M as of Q1 2026.
  • William Blair Investment Management sold 239,912 Thermon Group Holdings shares in Q1 2026, an estimated $11.2M.
  • Thermon Group Holdings made up 0.11% of William Blair Investment Management's portfolio in Q1 2026, its #176 holding.
  • William Blair Investment Management first reported a position in Thermon Group Holdings in Q2 2023 and has held it in 12 quarters since.
  • William Blair Investment Management's Thermon Group Holdings position peaked at $33M in Q4 2025.
  • 215 funds tracked by Wall St. Rank held Thermon Group Holdings as of Q1 2026.

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