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Winton Group’s Tandem Diabetes Care TNDM Stock Holding History

Winton Group’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
-44,244
Closed -$972K – 1374
2025
Q4 		$972K Buy
+44,244
New +$798K 0.03% 489
2022
Q3 		– Sell
-10,521
Closed -$623K – 1087
2022
Q2 		$623K Sell
10,521
-2,756
-21% -$226K 0.03% 634
2022
Q1 		$1.54M Sell
13,277
-1,536
-10% -$179K 0.08% 330
2021
Q4 		$2.23M Sell
14,813
-3,786
-20% -$511K 0.14% 191
2021
Q3 		$2.22M Sell
18,599
-1,000
-5% -$110K 0.12% 150
2021
Q2 		$1.91M Buy
19,599
+10,278
+110% +$916K 0.1% 209
2021
Q1 		$823K Buy
9,321
+4,991
+115% +$464K 0.05% 578
2020
Q4 		$414K Buy
4,330
+764
+21% +$78.7K 0.03% 878
2020
Q3 		$405K Buy
+3,566
New +$375K 0.01% 1170

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
ACH
ArrowMark Colorado Holdings Denver, Colorado $2.4B AUM 42.85% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
GKIM
GW&K Investment Management Boston, Massachusetts $12.8B AUM 48.82% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
DCM
Driehaus Capital Management Chicago, Illinois $17.3B AUM 211.34% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.89% 1-Year Est. Return

Winton Group's TNDM Position: Q1 2026 in Review

Winton Group sold out of Tandem Diabetes Care (TNDM) in Q1 2026, closing a stake of 44,244 shares — an estimated $972K sold.

Winton Group first reported a position in TNDM in Q3 2020 and held it in 9 quarters. The position peaked at $2.23M in Q4 2021. 274 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

  • Winton Group reported no remaining Tandem Diabetes Care position as of Q1 2026 after selling out during the quarter.
  • Winton Group sold 44,244 Tandem Diabetes Care shares in Q1 2026, an estimated $972K.
  • Winton Group first reported a position in Tandem Diabetes Care in Q3 2020 and held it in 9 quarters.
  • Winton Group's Tandem Diabetes Care position peaked at $2.23M in Q4 2021.
  • 274 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

Based on Winton Group's 13F filing for Q1 2026, filed 12 May 2026.