William Blair Investment Management
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William Blair Investment Management’s Selective Insurance SIGI Stock Holding History

William Blair Investment Management’s Portfolio SIGI Stock Details SIGI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$28.4M Sell
292,525
-77,894
-21% -$6.73M 0.09% 192
2026
Q1 		$27.9M Buy
370,419
+12,952
+4% +$1.06M 0.09% 200
2025
Q4 		$29.9M Sell
357,467
-37,394
-9% -$3M 0.08% 199
2025
Q3 		$32M Sell
394,861
-23,812
-6% -$1.92M 0.08% 199
2025
Q2 		$36.3M Buy
418,673
+127,012
+44% +$11.1M 0.1% 162
2025
Q1 		$26.7M Buy
+291,661
New +$25.6M 0.08% 245
2021
Q3 		– Sell
-19,278
Closed -$1.56M – 494
2021
Q2 		$1.56M Sell
19,278
-148,025
-88% -$11.3M ﹤0.01% 295
2021
Q1 		$12.1M Sell
167,303
-97,947
-37% -$6.82M 0.04% 264
2020
Q4 		$17.8M Sell
265,250
-5,225
-2% -$313K 0.06% 219
2020
Q3 		$13.9M Buy
270,475
+22,758
+9% +$1.25M 0.05% 230
2020
Q2 		$13.1M Sell
247,717
-579
-0.2% -$29.3K 0.05% 217
2020
Q1 		$12.3M Buy
248,296
+48,177
+24% +$2.93M 0.06% 220
2019
Q4 		$13M Sell
200,119
-80,854
-29% -$5.59M 0.05% 249
2019
Q3 		$21.1M Sell
280,973
-18,072
-6% -$1.39M 0.09% 187
2019
Q2 		$22.4M Sell
299,045
-47,469
-14% -$3.38M 0.09% 183
2019
Q1 		$21.9M Sell
346,514
-15,350
-4% -$966K 0.09% 189
2018
Q4 		$22.1M Sell
361,864
-110,194
-23% -$6.86M 0.11% 179
2018
Q3 		$30M Sell
472,058
-33,652
-7% -$2.07M 0.1% 190
2018
Q2 		$27.8M Sell
505,710
-68,061
-12% -$3.95M 0.1% 195
2018
Q1 		$34.8M Sell
573,771
-18,628
-3% -$1.1M 0.13% 167
2017
Q4 		$34.8M Buy
592,399
+2,815
+0.5% +$163K 0.14% 173
2017
Q3 		$31.7M Buy
589,584
+9,659
+2% +$491K 0.11% 179
2017
Q2 		$29M Buy
579,925
+26,310
+5% +$1.3M 0.11% 175
2017
Q1 		$26.1M Sell
553,615
-2,260
-0.4% -$101K 0.1% 189
2016
Q4 		$23.9M Sell
555,875
-3,126
-0.6% -$126K 0.1% 203
2016
Q3 		$22.3M Sell
559,001
-10,868
-2% -$427K 0.08% 204
2016
Q2 		$21.8M Sell
569,869
-12,143
-2% -$438K 0.09% 203
2016
Q1 		$21.3M Sell
582,012
-6,973
-1% -$231K 0.08% 194
2015
Q4 		$19.8M Sell
588,985
-26,792
-4% -$927K 0.08% 202
2015
Q3 		$19.1M Buy
+615,777
New +$18.8M 0.04% 530

Other funds holding SIGI

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 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
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $170B AUM 46.21% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

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

William Blair Investment Management reduced its Selective Insurance (SIGI) stake by 21% in Q2 2026, selling an estimated $6.73M and leaving 292,525 shares worth $28.4M. The position accounts for 0.09% of the portfolio, ranked #192.

William Blair Investment Management first reported a position in SIGI in Q3 2015 and has held it in 30 quarters since. The position peaked at $36.3M in Q2 2025. 374 funds tracked by Wall St. Rank hold SIGI as of Q2 2026.

  • William Blair Investment Management held 292,525 shares of Selective Insurance worth $28.4M as of Q2 2026.
  • William Blair Investment Management sold 77,894 Selective Insurance shares in Q2 2026, an estimated $6.73M.
  • Selective Insurance made up 0.09% of William Blair Investment Management's portfolio in Q2 2026, its #192 holding.
  • William Blair Investment Management first reported a position in Selective Insurance in Q3 2015 and has held it in 30 quarters since.
  • William Blair Investment Management's Selective Insurance position peaked at $36.3M in Q2 2025.
  • 374 funds tracked by Wall St. Rank held Selective Insurance as of Q2 2026.

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