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Gabelli Funds’s Tandem Diabetes Care TNDM Stock Holding History

Gabelli Funds’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 		$1.55M Buy
103,000
+78,000
+312% +$1.36M 0.01% 818
2026
Q1 		$479K Buy
+25,000
New +$543K ﹤0.01% 1046
2023
Q3 		– Sell
-11,000
Closed -$270K – 1154
2023
Q2 		$270K Buy
+11,000
New +$354K ﹤0.01% 981
2019
Q1 		– Sell
-8,135
Closed -$309K – 1162
2018
Q4 		$309K Hold
8,135
– – ﹤0.01% 1033
2018
Q3 		$349K Sell
8,135
-12,500
-61% -$437K ﹤0.01% 1056
2018
Q2 		$454K Hold
20,635
– – ﹤0.01% 1014
2018
Q1 		$102K Buy
+20,635
New +$66.5K ﹤0.01% 1130

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

Gabelli Funds's TNDM Position: Q2 2026 in Review

Gabelli Funds increased its Tandem Diabetes Care (TNDM) stake by 312% in Q2 2026, buying an estimated $1.36M and bringing the position to 103,000 shares worth $1.55M. The position accounts for 0.01% of the portfolio, ranked #818.

Gabelli Funds first reported a position in TNDM in Q1 2018 and has held it in 7 quarters since. 274 funds tracked by Wall St. Rank hold TNDM as of Q2 2026.

  • Gabelli Funds held 103,000 shares of Tandem Diabetes Care worth $1.55M as of Q2 2026.
  • Gabelli Funds bought 78,000 Tandem Diabetes Care shares in Q2 2026, an estimated $1.36M.
  • Tandem Diabetes Care made up 0.01% of Gabelli Funds's portfolio in Q2 2026, its #818 holding.
  • Gabelli Funds first reported a position in Tandem Diabetes Care in Q1 2018 and has held it in 7 quarters since.
  • 274 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q2 2026.

Based on Gabelli Funds's 13F filing for Q2 2026, filed 12 Aug 2026.