Jane Street
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Jane Street’s Tandem Diabetes Care TNDM Stock Holding History

Jane Street’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 		$665K Buy
34,700
+13,200
+61% +$287K ﹤0.01% 7375
2025
Q4 		$473K Buy
+21,500
New +$388K ﹤0.01% 7822
2025
Q3 		– Sell
-26,500
Closed -$494K – 11783
2025
Q2 		$494K Sell
26,500
-5,200
-16% -$103K ﹤0.01% 6948
2025
Q1 		$607K Sell
31,700
-72,600
-70% -$2.12M ﹤0.01% 6502
2024
Q4 		$3.76M Sell
104,300
-34,500
-25% -$1.17M ﹤0.01% 3076
2024
Q3 		$5.89M Sell
138,800
-18,700
-12% -$793K ﹤0.01% 2607
2024
Q2 		$6.35M Buy
157,500
+86,400
+122% +$3.6M ﹤0.01% 2627
2024
Q1 		$2.52M Buy
71,100
+27,700
+64% +$742K ﹤0.01% 3724
2023
Q4 		$1.28M Buy
43,400
+33,200
+325% +$689K ﹤0.01% 5122
2023
Q3 		$212K Buy
10,200
+1,700
+20% +$46.7K ﹤0.01% 7546
2023
Q2 		$209K Sell
8,500
-91,100
-91% -$2.93M ﹤0.01% 7636
2023
Q1 		$4.04M Buy
99,600
+74,400
+295% +$3.08M ﹤0.01% 2737
2022
Q4 		$1.13M Sell
25,200
-13,200
-34% -$598K ﹤0.01% 4784
2022
Q3 		$1.84M Sell
38,400
-42,300
-52% -$2.32M ﹤0.01% 4324
2022
Q2 		$4.78M Buy
80,700
+27,700
+52% +$2.27M ﹤0.01% 2721
2022
Q1 		$6.16M Sell
53,000
-34,500
-39% -$4.03M ﹤0.01% 2689
2021
Q4 		$13.2M Buy
87,500
+46,300
+112% +$6.25M ﹤0.01% 1575
2021
Q3 		$4.92M Sell
41,200
-49,200
-54% -$5.42M ﹤0.01% 2761
2021
Q2 		$8.8M Sell
90,400
-27,500
-23% -$2.45M ﹤0.01% 1862
2021
Q1 		$10.4M Sell
117,900
-113,500
-49% -$10.5M 0.01% 1513
2020
Q4 		$22.1M Sell
231,400
-54,500
-19% -$5.62M 0.01% 809
2020
Q3 		$32.5M Buy
285,900
+124,300
+77% +$13.1M 0.02% 549
2020
Q2 		$16M Buy
161,600
+151,400
+1,484% +$12.1M 0.01% 868
2020
Q1 		$656K Sell
10,200
-42,400
-81% -$2.97M ﹤0.01% 3328
2019
Q4 		$3.13M Buy
52,600
+17,900
+52% +$1.1M ﹤0.01% 1474
2019
Q3 		$2.05M Sell
34,700
-23,600
-40% -$1.51M ﹤0.01% 1770
2019
Q2 		$3.76M Buy
58,300
+20,900
+56% +$1.35M 0.01% 1286
2019
Q1 		$2.38M Buy
37,400
+32,000
+593% +$1.68M ﹤0.01% 1848
2018
Q4 		$205K Buy
+5,400
New +$191K ﹤0.01% 4461

Other funds holding TNDM

BlackRock
BlackRock New York $5.72T AUM 30.48% 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 $2.9T AUM 29.55% 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
Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return

Jane Street's TNDM Position: Q1 2026 in Review

Jane Street sold out of Tandem Diabetes Care (TNDM) in Q1 2026, closing a stake of 209,975 shares — an estimated $4.56M sold.

Jane Street first reported a position in TNDM in Q1 2014 and held it in 28 quarters. The position peaked at $16.7M in Q2 2020. 272 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

  • Jane Street reported no remaining Tandem Diabetes Care position as of Q1 2026 after selling out during the quarter.
  • Jane Street sold 209,975 Tandem Diabetes Care shares in Q1 2026, an estimated $4.56M.
  • Jane Street first reported a position in Tandem Diabetes Care in Q1 2014 and held it in 28 quarters.
  • Jane Street's Tandem Diabetes Care position peaked at $16.7M in Q2 2020.
  • 272 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.