Ken Griffin
TNDM icon

Ken Griffin’s Tandem Diabetes Care TNDM Stock Holding History

Ken Griffin’s Portfolio TNDM Stock Details TNDM Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$42M Buy
2,192,667
+104,064
+5% +$2.26M 0.01% 1524
2025
Q4 		$45.9M Buy
2,088,603
+2,048,802
+5,148% +$37M 0.01% 1495
2025
Q3 		$483K Sell
39,801
-313,158
-89% -$4.24M ﹤0.01% 9222
2025
Q2 		$6.58M Buy
352,959
+238,925
+210% +$4.73M ﹤0.01% 3658
2025
Q1 		$2.18M Sell
114,034
-17,792
-13% -$521K ﹤0.01% 5361
2024
Q4 		$4.75M Sell
131,826
-215,997
-62% -$7.31M ﹤0.01% 4046
2024
Q3 		$14.8M Sell
347,823
-1,460,918
-81% -$61.9M ﹤0.01% 2399
2024
Q2 		$72.9M Buy
1,808,741
+1,241,673
+219% +$51.8M 0.01% 864
2024
Q1 		$20.1M Buy
567,068
+206,355
+57% +$5.53M ﹤0.01% 2063
2023
Q4 		$10.7M Sell
360,713
-284,651
-44% -$5.91M ﹤0.01% 2754
2023
Q3 		$13.4M Buy
645,364
+474,239
+277% +$13M ﹤0.01% 2328
2023
Q2 		$4.2M Sell
171,125
-8,930
-5% -$287K ﹤0.01% 3921
2023
Q1 		$7.31M Sell
180,055
-86,564
-32% -$3.58M ﹤0.01% 3217
2022
Q4 		$12M Sell
266,619
-43,187
-14% -$1.96M ﹤0.01% 2565
2022
Q3 		$14.8M Buy
309,806
+264,506
+584% +$14.5M ﹤0.01% 2237
2022
Q2 		$2.68M Sell
45,300
-468,688
-91% -$38.5M ﹤0.01% 4970
2022
Q1 		$59.8M Sell
513,988
-294,141
-36% -$34.3M 0.01% 988
2021
Q4 		$122M Buy
808,129
+585,013
+262% +$79M 0.02% 557
2021
Q3 		$26.6M Sell
223,116
-174,268
-44% -$19.2M 0.01% 1676
2021
Q2 		$38.7M Sell
397,384
-253,100
-39% -$22.6M 0.01% 1343
2021
Q1 		$57.4M Buy
650,484
+446,808
+219% +$41.5M 0.01% 940
2020
Q4 		$19.5M Buy
203,676
+11,503
+6% +$1.19M 0.01% 1834
2020
Q3 		$21.8M Buy
192,173
+137,688
+253% +$14.5M 0.01% 1501
2020
Q2 		$5.39M Buy
54,485
+3,857
+8% +$308K ﹤0.01% 2991
2020
Q1 		$3.26M Sell
50,628
-229,565
-82% -$16.1M ﹤0.01% 3324
2019
Q4 		$16.7M Sell
280,193
-301,858
-52% -$18.6M 0.01% 1653
2019
Q3 		$34.3M Buy
582,051
+220,486
+61% +$14.1M 0.02% 1020
2019
Q2 		$23.3M Buy
361,565
+221,726
+159% +$14.3M 0.01% 1287
2019
Q1 		$8.88M Buy
139,839
+18,729
+15% +$984K ﹤0.01% 2226
2018
Q4 		$4.6M Sell
121,110
-198,596
-62% -$7.01M ﹤0.01% 2904
2018
Q3 		$13.7M Buy
319,706
+134,942
+73% +$4.71M 0.01% 1752
2018
Q2 		$4.07M Buy
+184,764
New +$2.27M ﹤0.01% 3051
2017
Q1 		– Sell
-3,778
Closed -$81K – 8046
2016
Q4 		$81K Buy
3,778
+2,179
+136% +$83.8K ﹤0.01% 6750
2016
Q3 		$122K Buy
+1,599
New +$117K ﹤0.01% 6570
2015
Q3 		– Sell
-1,021
Closed -$111K – 9233
2015
Q2 		$111K Buy
+1,021
New +$127K ﹤0.01% 6980

Other funds holding TNDM

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
SC
Sessa Capital New York $5.51B AUM 47.23% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
ACH
ArrowMark Colorado Holdings Denver, Colorado $3.76B AUM 21.77% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
GKIM
GW&K Investment Management Boston, Massachusetts $11.3B AUM 31.98% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
DCM
Driehaus Capital Management Chicago, Illinois $13.6B AUM 173.98% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

Ken Griffin's TNDM Position: Q1 2026 in Review

Ken Griffin increased its Tandem Diabetes Care (TNDM) stake by 5% in Q1 2026, buying an estimated $2.26M and bringing the position to 2,192,667 shares worth $42M. The position accounts for 0.01% of the portfolio, ranked #1524.

Ken Griffin first reported a position in TNDM in Q2 2015 and has held it in 35 quarters since. The position peaked at $122M in Q4 2021. 272 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

  • Ken Griffin held 2,192,667 shares of Tandem Diabetes Care worth $42M as of Q1 2026.
  • Ken Griffin bought 104,064 Tandem Diabetes Care shares in Q1 2026, an estimated $2.26M.
  • Tandem Diabetes Care made up 0.01% of Ken Griffin's portfolio in Q1 2026, its #1524 holding.
  • Ken Griffin first reported a position in Tandem Diabetes Care in Q2 2015 and has held it in 35 quarters since.
  • Ken Griffin's Tandem Diabetes Care position peaked at $122M in Q4 2021.
  • 272 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

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