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 		$69K Sell
3,600
-15,600
-81% -$339K ﹤0.01% 3596
2025
Q4 		$422K Sell
19,200
-1,500
-7% -$27.1K ﹤0.01% 2929
2025
Q3 		$251K Buy
20,700
+13,700
+196% +$185K ﹤0.01% 3205
2025
Q2 		$130K Buy
+7,000
New +$139K ﹤0.01% 3469
2024
Q4 		– Sell
-600
Closed -$25.4K – 4678
2024
Q3 		$25.4K Sell
600
-3,600
-86% -$153K ﹤0.01% 3634
2024
Q2 		$169K Buy
4,200
+2,000
+91% +$83.4K ﹤0.01% 3174
2024
Q1 		$77.9K Sell
2,200
-38,600
-95% -$1.03M ﹤0.01% 3866
2023
Q4 		$1.21M Buy
40,800
+32,200
+374% +$668K ﹤0.01% 2311
2023
Q3 		$179K Buy
+8,600
New +$236K ﹤0.01% 3680
2023
Q1 		– Sell
-3,600
Closed -$162K – 5403
2022
Q4 		$162K Buy
3,600
+600
+20% +$27.2K ﹤0.01% 3738
2022
Q3 		$144K Sell
3,000
-11,300
-79% -$620K ﹤0.01% 3897
2022
Q2 		$846K Buy
14,300
+6,900
+93% +$566K ﹤0.01% 2388
2022
Q1 		$861K Sell
7,400
-11,600
-61% -$1.35M ﹤0.01% 2365
2021
Q4 		$2.86M Buy
19,000
+800
+4% +$108K 0.01% 1351
2021
Q3 		$2.17M Buy
18,200
+9,200
+102% +$1.01M 0.01% 1547
2021
Q2 		$877K Buy
+9,000
New +$803K ﹤0.01% 2274
2021
Q1 		– Sell
-3,400
Closed -$325K – 5302
2020
Q4 		$325K Sell
3,400
-700
-17% -$72.1K ﹤0.01% 3065
2020
Q3 		$465K Buy
4,100
+1,000
+32% +$105K ﹤0.01% 2304
2020
Q2 		$307K Buy
3,100
+2,400
+343% +$192K ﹤0.01% 2697
2020
Q1 		$45K Sell
700
-6,600
-90% -$462K ﹤0.01% 3453
2019
Q4 		$435K Buy
7,300
+6,900
+1,725% +$426K ﹤0.01% 2528
2019
Q3 		$24K Sell
400
-1,600
-80% -$102K ﹤0.01% 3735
2019
Q2 		$129K Sell
2,000
-2,200
-52% -$142K ﹤0.01% 3199
2019
Q1 		$267K Buy
4,200
+2,700
+180% +$142K ﹤0.01% 2804
2018
Q4 		$57K Buy
+1,500
New +$53K ﹤0.01% 4094

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.