Ken Griffin
INSP icon

Ken Griffin’s Inspire Medical Systems INSP Stock Holding History

Ken Griffin’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
Q1 		$3.14M Buy
60,800
+25,500
+72% +$1.79M ﹤0.01% 5179
2025
Q4 		$3.26M Sell
35,300
-43,300
-55% -$4.14M ﹤0.01% 5017
2025
Q3 		$5.83M Buy
78,600
+51,900
+194% +$5.25M ﹤0.01% 4080
2025
Q2 		$3.46M Sell
26,700
-66,600
-71% -$9.66M ﹤0.01% 4723
2025
Q1 		$14.9M Buy
93,300
+27,800
+42% +$5.03M ﹤0.01% 2369
2024
Q4 		$12.1M Buy
65,500
+5,600
+9% +$1.09M ﹤0.01% 2731
2024
Q3 		$12.6M Sell
59,900
-31,400
-34% -$5.45M ﹤0.01% 2579
2024
Q2 		$12.2M Sell
91,300
-27,800
-23% -$5.26M ﹤0.01% 2524
2024
Q1 		$25.6M Buy
119,100
+36,500
+44% +$7.15M ﹤0.01% 1829
2023
Q4 		$16.8M Buy
82,600
+23,900
+41% +$3.87M ﹤0.01% 2201
2023
Q3 		$11.6M Buy
58,700
+6,700
+13% +$1.69M ﹤0.01% 2491
2023
Q2 		$16.9M Buy
52,000
+3,900
+8% +$1.11M ﹤0.01% 2058
2023
Q1 		$11.3M Buy
48,100
+1,300
+3% +$329K ﹤0.01% 2648
2022
Q4 		$11.8M Buy
46,800
+14,300
+44% +$3.05M ﹤0.01% 2601
2022
Q3 		$5.76M Sell
32,500
-10,300
-24% -$2.07M ﹤0.01% 3636
2022
Q2 		$7.82M Buy
42,800
+21,300
+99% +$4.25M ﹤0.01% 3008
2022
Q1 		$5.52M Buy
21,500
+6,000
+39% +$1.37M ﹤0.01% 3987
2021
Q4 		$3.57M Buy
15,500
+4,000
+35% +$977K ﹤0.01% 4982
2021
Q3 		$2.68M Sell
11,500
-9,100
-44% -$1.9M ﹤0.01% 5634
2021
Q2 		$3.98M Sell
20,600
-49,900
-71% -$9.9M ﹤0.01% 4947
2021
Q1 		$14.6M Buy
70,500
+1,900
+3% +$404K ﹤0.01% 2407
2020
Q4 		$12.9M Buy
68,600
+39,400
+135% +$6.44M ﹤0.01% 2319
2020
Q3 		$3.77M Buy
29,200
+7,700
+36% +$848K ﹤0.01% 3582
2020
Q2 		$1.87M Buy
21,500
+16,000
+291% +$1.23M ﹤0.01% 4702
2020
Q1 		$332K Sell
5,500
-5,000
-48% -$370K ﹤0.01% 7148
2019
Q4 		$779K Sell
10,500
-8,100
-44% -$521K ﹤0.01% 6050
2019
Q3 		$1.14M Buy
18,600
+14,000
+304% +$922K ﹤0.01% 5376
2019
Q2 		$279K Sell
4,600
-4,900
-52% -$264K ﹤0.01% 7692
2019
Q1 		$539K Buy
+9,500
New +$513K ﹤0.01% 6665

Other funds holding INSP

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
DM
Deerfield Management New York $8.48B AUM 99.04% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
D.E. Shaw & Co
D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return
William Blair Investment Management
William Blair Investment Management Chicago, Illinois $33.3B AUM 44.76% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $62.3B AUM 26.25% 1-Year Est. Return

Ken Griffin's INSP Position: Q1 2026 in Review

Ken Griffin reduced its Inspire Medical Systems (INSP) stake by 23% in Q1 2026, selling an estimated $8.21M and leaving 394,076 shares worth $20.3M. The position accounts for ﹤0.01% of the portfolio, ranked #2329.

Ken Griffin first reported a position in INSP in Q2 2018 and has held it in 32 quarters since. The position peaked at $159M in Q4 2022. 301 funds tracked by Wall St. Rank hold INSP as of Q1 2026.

  • Ken Griffin held 394,076 shares of Inspire Medical Systems worth $20.3M as of Q1 2026.
  • Ken Griffin sold 117,242 Inspire Medical Systems shares in Q1 2026, an estimated $8.21M.
  • Inspire Medical Systems made up ﹤0.01% of Ken Griffin's portfolio in Q1 2026, its #2329 holding.
  • Ken Griffin first reported a position in Inspire Medical Systems in Q2 2018 and has held it in 32 quarters since.
  • Ken Griffin's Inspire Medical Systems position peaked at $159M in Q4 2022.
  • 301 funds tracked by Wall St. Rank held Inspire Medical Systems as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.