William Blair Investment Management
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William Blair Investment Management’s Hanover Insurance THG Stock Holding History

William Blair Investment Management’s Portfolio THG Stock Details THG Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$33M Sell
154,277
-41,483
-21% -$7.85M 0.1% 179
2026
Q1 		$33.9M Buy
195,760
+46,541
+31% +$8.09M 0.11% 169
2025
Q4 		$27.3M Buy
149,219
+9,327
+7% +$1.68M 0.08% 216
2025
Q3 		$25.4M Buy
+139,892
New +$24M 0.07% 258
2022
Q4 		– Sell
-94,385
Closed -$12.1M – 416
2022
Q3 		$12.1M Buy
+94,385
New +$12.8M 0.05% 297
2021
Q3 		– Sell
-8,457
Closed -$1.15M – 503
2021
Q2 		$1.15M Sell
8,457
-65,043
-88% -$8.92M ﹤0.01% 310
2021
Q1 		$9.52M Sell
73,500
-43,029
-37% -$5.19M 0.03% 288
2020
Q4 		$13.6M Sell
116,529
-2,294
-2% -$247K 0.05% 252
2020
Q3 		$11.1M Buy
118,823
+9,988
+9% +$992K 0.04% 256
2020
Q2 		$11M Sell
108,835
-416
-0.4% -$40.8K 0.04% 238
2020
Q1 		$9.9M Buy
109,251
+10,776
+11% +$1.33M 0.05% 232
2019
Q4 		$13.5M Sell
98,475
-39,733
-29% -$5.35M 0.05% 244
2019
Q3 		$18.7M Sell
138,208
-8,227
-6% -$1.08M 0.08% 212
2019
Q2 		$18.8M Sell
146,435
-56,712
-28% -$6.89M 0.08% 212
2019
Q1 		$23.2M Sell
203,147
-8,938
-4% -$1.03M 0.1% 179
2018
Q4 		$24.8M Sell
212,085
-35,994
-15% -$4.04M 0.12% 166
2018
Q3 		$30.6M Sell
248,079
-13,989
-5% -$1.73M 0.11% 188
2018
Q2 		$31.3M Sell
262,068
-7,491
-3% -$891K 0.12% 182
2018
Q1 		$31.8M Sell
269,559
-6,881
-2% -$773K 0.12% 176
2017
Q4 		$29.9M Buy
276,440
+3,973
+1% +$410K 0.12% 191
2017
Q3 		$26.4M Buy
272,467
+7,760
+3% +$738K 0.09% 200
2017
Q2 		$23.5M Buy
264,707
+20,807
+9% +$1.79M 0.09% 210
2017
Q1 		$22M Sell
243,900
-988
-0.4% -$87.5K 0.08% 215
2016
Q4 		$22.3M Sell
244,888
-2,618
-1% -$218K 0.09% 213
2016
Q3 		$18.7M Sell
247,506
-4,505
-2% -$358K 0.07% 232
2016
Q2 		$21.3M Sell
252,011
-4,286
-2% -$369K 0.08% 208
2016
Q1 		$23.1M Sell
256,297
-3,208
-1% -$265K 0.09% 188
2015
Q4 		$21.1M Sell
259,505
-12,846
-5% -$1.06M 0.09% 188
2015
Q3 		$21.2M Buy
+272,351
New +$21.6M 0.04% 494

Other funds holding THG

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $36.7B AUM 74.15% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $170B AUM 46.21% 1-Year Est. Return

William Blair Investment Management's THG Position: Q2 2026 in Review

William Blair Investment Management reduced its Hanover Insurance (THG) stake by 21% in Q2 2026, selling an estimated $7.85M and leaving 154,277 shares worth $33M. The position accounts for 0.1% of the portfolio, ranked #179.

William Blair Investment Management first reported a position in THG in Q3 2015 and has held it in 29 quarters since. The position peaked at $33.9M in Q1 2026. 546 funds tracked by Wall St. Rank hold THG as of Q2 2026.

  • William Blair Investment Management held 154,277 shares of Hanover Insurance worth $33M as of Q2 2026.
  • William Blair Investment Management sold 41,483 Hanover Insurance shares in Q2 2026, an estimated $7.85M.
  • Hanover Insurance made up 0.1% of William Blair Investment Management's portfolio in Q2 2026, its #179 holding.
  • William Blair Investment Management first reported a position in Hanover Insurance in Q3 2015 and has held it in 29 quarters since.
  • William Blair Investment Management's Hanover Insurance position peaked at $33.9M in Q1 2026.
  • 546 funds tracked by Wall St. Rank held Hanover Insurance as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.