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 		$1.36M Buy
70,900
+15,200
+27% +$330K ﹤0.01% 5833
2025
Q4 		$1.22M Buy
55,700
+11,000
+25% +$199K ﹤0.01% 5738
2025
Q3 		$543K Hold
44,700
– – ﹤0.01% 7677
2025
Q2 		$833K Sell
44,700
-1,800
-4% -$35.6K ﹤0.01% 5966
2025
Q1 		$891K Buy
+46,500
New +$1.36M ﹤0.01% 5789
2024
Q4 		– Sell
-52,500
Closed -$2.23M – 10592
2024
Q3 		$2.23M Buy
52,500
+47,200
+891% +$2M ﹤0.01% 4249
2024
Q2 		$214K Buy
+5,300
New +$221K ﹤0.01% 8288
2024
Q1 		– Sell
-10,200
Closed -$302K – 10082
2023
Q4 		$302K Buy
+10,200
New +$212K ﹤0.01% 7591
2023
Q2 		– Sell
-5,700
Closed -$231K – 9566
2023
Q1 		$231K Sell
5,700
-24,200
-81% -$1M ﹤0.01% 7611
2022
Q4 		$1.34M Buy
29,900
+7,900
+36% +$358K ﹤0.01% 4499
2022
Q3 		$1.05M Sell
22,000
-6,000
-21% -$329K ﹤0.01% 5327
2022
Q2 		$1.66M Buy
28,000
+3,300
+13% +$271K ﹤0.01% 4513
2022
Q1 		$2.87M Buy
24,700
+18,600
+305% +$2.17M ﹤0.01% 4043
2021
Q4 		$918K Sell
6,100
-17,500
-74% -$2.36M ﹤0.01% 6068
2021
Q3 		$2.82M Buy
23,600
+9,100
+63% +$1M ﹤0.01% 3779
2021
Q2 		$1.41M Sell
14,500
-10,000
-41% -$892K ﹤0.01% 5059
2021
Q1 		$2.16M Sell
24,500
-38,800
-61% -$3.61M ﹤0.01% 3865
2020
Q4 		$6.06M Buy
63,300
+16,100
+34% +$1.66M ﹤0.01% 1906
2020
Q3 		$5.36M Sell
47,200
-10,400
-18% -$1.09M ﹤0.01% 1779
2020
Q2 		$5.7M Buy
+57,600
New +$4.6M ﹤0.01% 1706
2020
Q1 		– Sell
-35,100
Closed -$2.09M – 5973
2019
Q4 		$2.09M Buy
35,100
+15,300
+77% +$944K ﹤0.01% 1889
2019
Q3 		$1.17M Buy
19,800
+5,400
+38% +$345K ﹤0.01% 2420
2019
Q2 		$929K Sell
14,400
-13,900
-49% -$897K ﹤0.01% 2797
2019
Q1 		$1.8M Buy
+28,300
New +$1.49M ﹤0.01% 2148

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.