Walleye Trading
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Walleye Trading’s Tandem Diabetes Care TNDM Stock Holding History

Walleye Trading’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 		– Sell
-9,358
Closed -$203K – 4723
2025
Q4 		$206K Buy
9,358
+2,240
+31% +$40.4K ﹤0.01% 3375
2025
Q3 		$86.4K Buy
7,118
+975
+16% +$13.2K ﹤0.01% 3776
2025
Q2 		$115K Buy
+6,143
New +$122K ﹤0.01% 3525
2024
Q1 		– Sell
-67
Closed -$1.79K – 5356
2023
Q4 		$1.98K Buy
+67
New +$1.39K ﹤0.01% 4824
2022
Q2 		– Sell
-3,409
Closed -$280K – 5668
2022
Q1 		$396K Buy
+3,409
New +$398K ﹤0.01% 3140
2021
Q4 		– Sell
-1,709
Closed -$231K – 5874
2021
Q3 		$204K Sell
1,709
-2,815
-62% -$310K ﹤0.01% 3826
2021
Q2 		$441K Buy
+4,524
New +$403K ﹤0.01% 3057
2021
Q1 		– Sell
-6,480
Closed -$620K – 5301
2020
Q4 		$620K Buy
6,480
+2,400
+59% +$247K ﹤0.01% 2466
2020
Q3 		$463K Sell
4,080
-502
-11% -$52.7K ﹤0.01% 2307
2020
Q2 		$453K Buy
4,582
+1,589
+53% +$127K ﹤0.01% 2350
2020
Q1 		$193K Buy
+2,993
New +$210K ﹤0.01% 2627
2019
Q2 		– Sell
-3,347
Closed -$216K – 4483
2019
Q1 		$213K Buy
+3,347
New +$176K ﹤0.01% 2977

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

Walleye Trading's TNDM Position: Q1 2026 in Review

Walleye Trading sold out of Tandem Diabetes Care (TNDM) in Q1 2026, closing a stake of 9,358 shares — an estimated $203K sold.

Walleye Trading first reported a position in TNDM in Q1 2019 and held it in 12 quarters. The position peaked at $620K in Q4 2020. 272 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

  • Walleye Trading reported no remaining Tandem Diabetes Care position as of Q1 2026 after selling out during the quarter.
  • Walleye Trading sold 9,358 Tandem Diabetes Care shares in Q1 2026, an estimated $203K.
  • Walleye Trading first reported a position in Tandem Diabetes Care in Q1 2019 and held it in 12 quarters.
  • Walleye Trading's Tandem Diabetes Care position peaked at $620K in Q4 2020.
  • 272 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

Based on Walleye Trading's 13F filing for Q1 2026, filed 11 May 2026.