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
Q2 		$315K Buy
+20,849
New +$364K ﹤0.01% 2913
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 $6.73T AUM 46.02% 1-Year Est. Return
SC
Sessa Capital New York $5.98B AUM 99.85% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
FLAM
First Light Asset Management Edina, Minnesota $1.65B AUM 203.21% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
GKIM
GW&K Investment Management Boston, Massachusetts $12.8B AUM 48.82% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $167B AUM 44.17% 1-Year Est. Return
PIM
Paradice Investment Management Denver, Colorado $627M AUM 43.41% 1-Year Est. Return
Jacobs Levy Equity Management
Jacobs Levy Equity Management Florham Park, New Jersey $27.8B AUM 46.46% 1-Year Est. Return

Walleye Trading's TNDM Position: Q2 2026 in Review

Walleye Trading opened a new position in Tandem Diabetes Care (TNDM) in Q2 2026: 20,849 shares worth $315K. The stake represents ﹤0.01% of the portfolio and ranks #2913 among its holdings. This is a return to the name: Walleye Trading previously reported a position in TNDM as recently as Q4 2025.

Walleye Trading first reported a position in TNDM in Q1 2019 and has held it in 13 quarters since. The position peaked at $620K in Q4 2020. 274 funds tracked by Wall St. Rank hold TNDM as of Q2 2026.

  • Walleye Trading held 20,849 shares of Tandem Diabetes Care worth $315K as of Q2 2026.
  • Tandem Diabetes Care was a new Walleye Trading position in Q2 2026.
  • Tandem Diabetes Care made up ﹤0.01% of Walleye Trading's portfolio in Q2 2026, its #2913 holding.
  • Walleye Trading first reported a position in Tandem Diabetes Care in Q1 2019 and has held it in 13 quarters since.
  • Walleye Trading's Tandem Diabetes Care position peaked at $620K in Q4 2020.
  • 274 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q2 2026.

Based on Walleye Trading's 13F filing for Q2 2026, filed 3 Aug 2026.