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 		$207K Sell
10,800
-5,900
-35% -$128K ﹤0.01% 3094
2025
Q4 		$367K Buy
16,700
+300
+2% +$5.41K ﹤0.01% 3022
2025
Q3 		$199K Sell
16,400
-700
-4% -$9.47K ﹤0.01% 3371
2025
Q2 		$319K Buy
+17,100
New +$339K ﹤0.01% 2951
2024
Q4 		– Sell
-5,000
Closed -$212K – 4677
2024
Q3 		$212K Sell
5,000
-1,500
-23% -$63.6K ﹤0.01% 3026
2024
Q2 		$262K Buy
6,500
+600
+10% +$25K ﹤0.01% 2919
2024
Q1 		$209K Sell
5,900
-5,900
-50% -$158K ﹤0.01% 3395
2023
Q4 		$349K Buy
11,800
+4,200
+55% +$87.1K ﹤0.01% 3383
2023
Q3 		$158K Buy
+7,600
New +$209K ﹤0.01% 3746
2023
Q1 		– Sell
-46,300
Closed -$2.08M – 5402
2022
Q4 		$2.08M Sell
46,300
-4,300
-8% -$195K 0.01% 1648
2022
Q3 		$2.42M Buy
50,600
+26,200
+107% +$1.44M 0.01% 1552
2022
Q2 		$1.44M Buy
24,400
+18,400
+307% +$1.51M ﹤0.01% 1930
2022
Q1 		$698K Sell
6,000
-17,400
-74% -$2.03M ﹤0.01% 2569
2021
Q4 		$3.52M Buy
+23,400
New +$3.16M 0.01% 1214
2021
Q3 		– Sell
-500
Closed -$49K – 5720
2021
Q2 		$49K Buy
+500
New +$44.6K ﹤0.01% 4630
2021
Q1 		– Sell
-500
Closed -$48K – 5300
2020
Q4 		$48K Sell
500
-4,100
-89% -$423K ﹤0.01% 4189
2020
Q3 		$522K Buy
4,600
+2,300
+100% +$242K ﹤0.01% 2210
2020
Q2 		$228K Buy
2,300
+1,200
+109% +$95.8K ﹤0.01% 2974
2020
Q1 		$71K Sell
1,100
-20,200
-95% -$1.42M ﹤0.01% 3298
2019
Q4 		$1.27M Buy
21,300
+17,600
+476% +$1.09M 0.01% 1593
2019
Q3 		$218K Sell
3,700
-300
-8% -$19.1K ﹤0.01% 2866
2019
Q2 		$258K Sell
4,000
-1,200
-23% -$77.4K ﹤0.01% 2744
2019
Q1 		$330K Sell
5,200
-7,200
-58% -$378K ﹤0.01% 2627
2018
Q4 		$471K Buy
+12,400
New +$438K ﹤0.01% 2533

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.