William Blair Investment Management
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William Blair Investment Management’s Inspire Medical Systems INSP Stock Holding History

William Blair Investment Management’s Portfolio INSP Stock Details INSP Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		– Sell
-1,137,384
Closed -$58.7M – 423
2026
Q1 		$58.7M Sell
1,137,384
-23,901
-2% -$1.67M 0.19% 125
2025
Q4 		$107M Sell
1,161,285
-136,288
-11% -$13M 0.3% 94
2025
Q3 		$96.3M Buy
1,297,573
+528,404
+69% +$53.5M 0.25% 104
2025
Q2 		$99.8M Buy
769,169
+76,251
+11% +$11.1M 0.26% 100
2025
Q1 		$110M Sell
692,918
-209,693
-23% -$37.9M 0.31% 91
2024
Q4 		$167M Sell
902,611
-3,738
-0.4% -$726K 0.41% 80
2024
Q3 		$191M Buy
906,349
+135,936
+18% +$23.6M 0.47% 61
2024
Q2 		$103M Buy
770,413
+13,602
+2% +$2.57M 0.27% 98
2024
Q1 		$163M Sell
756,811
-50,136
-6% -$9.83M 0.42% 74
2023
Q4 		$164M Buy
806,947
+112,802
+16% +$18.3M 0.48% 69
2023
Q3 		$138M Sell
694,145
-142,017
-17% -$35.8M 0.46% 75
2023
Q2 		$271M Sell
836,162
-528
-0.1% -$151K 0.87% 18
2023
Q1 		$196M Buy
836,690
+3,267
+0.4% +$826K 0.68% 39
2022
Q4 		$210M Buy
833,423
+174,811
+27% +$37.3M 0.8% 32
2022
Q3 		$117M Sell
658,612
-5,779
-0.9% -$1.16M 0.46% 76
2022
Q2 		$121M Sell
664,391
-89,694
-12% -$17.9M 0.45% 77
2022
Q1 		$194M Sell
754,085
-130,106
-15% -$29.7M 0.58% 59
2021
Q4 		$203M Sell
884,191
-11,785
-1% -$2.88M 0.55% 61
2021
Q3 		$209M Buy
895,976
+134,501
+18% +$28.1M 0.59% 54
2021
Q2 		$147M Buy
761,475
+118,294
+18% +$23.5M 0.46% 86
2021
Q1 		$133M Buy
643,181
+115,100
+22% +$24.5M 0.43% 89
2020
Q4 		$99.3M Buy
+528,081
New +$86.3M 0.33% 102
2020
Q1 		– Sell
-1,190,766
Closed -$88.4M – 363
2019
Q4 		$88.4M Buy
1,190,766
+72,666
+6% +$4.67M 0.35% 94
2019
Q3 		$68.2M Sell
1,118,100
-42,780
-4% -$2.82M 0.29% 96
2019
Q2 		$70.4M Buy
1,160,880
+64,785
+6% +$3.49M 0.3% 98
2019
Q1 		$62.2M Buy
1,096,095
+883,826
+416% +$47.8M 0.26% 102
2018
Q4 		$8.97M Buy
+212,269
New +$9.02M 0.04% 317

Other funds holding INSP

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
SCM
Soleus Capital Management Greenwich, Connecticut $2.9B AUM 169.69% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return
Nomura Holdings
Nomura Holdings Tokyo, Japan $85.4B AUM 91.09% 1-Year Est. Return
DM
Deerfield Management New York $9.59B AUM 113.36% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

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

William Blair Investment Management sold out of Inspire Medical Systems (INSP) in Q2 2026, closing a stake of 1,137,384 shares — an estimated $58.7M sold.

William Blair Investment Management first reported a position in INSP in Q4 2018 and held it in 27 quarters. The position peaked at $271M in Q2 2023. 275 funds tracked by Wall St. Rank hold INSP as of Q2 2026.

  • William Blair Investment Management reported no remaining Inspire Medical Systems position as of Q2 2026 after selling out during the quarter.
  • William Blair Investment Management sold 1,137,384 Inspire Medical Systems shares in Q2 2026, an estimated $58.7M.
  • William Blair Investment Management first reported a position in Inspire Medical Systems in Q4 2018 and held it in 27 quarters.
  • William Blair Investment Management's Inspire Medical Systems position peaked at $271M in Q2 2023.
  • 275 funds tracked by Wall St. Rank held Inspire Medical Systems as of Q2 2026.

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