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Atom Investors’s Tandem Diabetes Care TNDM Stock Holding History

Atom Investors’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
2025
Q4 		– Sell
-13,521
Closed -$164K – 805
2025
Q3 		$164K Buy
+13,521
New +$183K 0.01% 527
2020
Q4 		– Sell
-3,056
Closed -$347K – 568
2020
Q3 		$347K Buy
+3,056
New +$321K 0.03% 277
2020
Q1 		– Sell
-11,974
Closed -$714K – 377
2019
Q4 		$714K Buy
+11,974
New +$738K 0.06% 171
2019
Q2 		– Sell
-3,849
Closed -$244K – 614
2019
Q1 		$244K Buy
+3,849
New +$202K 0.02% 459

Other funds holding TNDM

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
SC
Sessa Capital New York $5.51B AUM 47.23% 1-Year Est. Return
ACH
ArrowMark Colorado Holdings Denver, Colorado $3.76B AUM 21.77% 1-Year Est. Return
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
Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
PIM
Paradice Investment Management Denver, Colorado $532M AUM 29.6% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $145B AUM 34.61% 1-Year Est. Return

Atom Investors's TNDM Position: Q4 2025 in Review

Atom Investors sold out of Tandem Diabetes Care (TNDM) in Q4 2025, closing a stake of 13,521 shares — an estimated $164K sold.

Atom Investors first reported a position in TNDM in Q1 2019 and held it in 4 quarters. The position peaked at $714K in Q4 2019. 268 funds tracked by Wall St. Rank hold TNDM as of Q4 2025.

  • Atom Investors reported no remaining Tandem Diabetes Care position as of Q4 2025 after selling out during the quarter.
  • Atom Investors sold 13,521 Tandem Diabetes Care shares in Q4 2025, an estimated $164K.
  • Atom Investors first reported a position in Tandem Diabetes Care in Q1 2019 and held it in 4 quarters.
  • Atom Investors's Tandem Diabetes Care position peaked at $714K in Q4 2019.
  • 268 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q4 2025.

Based on Atom Investors's 13F filing for Q4 2025, filed 17 Feb 2026.