Mariner
TNDM icon

Mariner’s Tandem Diabetes Care TNDM Stock Holding History

Mariner’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 		$555K Buy
36,750
+3,742
+11% +$65.3K ﹤0.01% 2383
2026
Q1 		$633K Sell
33,008
-2,521
-7% -$54.8K ﹤0.01% 2308
2025
Q4 		$781K Buy
35,529
+10,726
+43% +$194K ﹤0.01% 2127
2025
Q3 		$301K Buy
24,803
+7,062
+40% +$95.6K ﹤0.01% 2805
2025
Q2 		$331K Sell
17,741
-4,404
-20% -$87.2K ﹤0.01% 2644
2025
Q1 		$424K Buy
22,145
+5,264
+31% +$154K ﹤0.01% 2337
2024
Q4 		$608K Sell
16,881
-324
-2% -$11K ﹤0.01% 2024
2024
Q3 		$730K Buy
17,205
+235
+1% +$9.96K ﹤0.01% 1844
2024
Q2 		$684K Buy
16,970
+428
+3% +$17.9K ﹤0.01% 1790
2024
Q1 		$586K Buy
16,542
+82
+0.5% +$2.2K ﹤0.01% 1910
2023
Q4 		$487K Buy
+16,460
New +$341K ﹤0.01% 1945

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

Mariner's TNDM Position: Q2 2026 in Review

Mariner increased its Tandem Diabetes Care (TNDM) stake by 11% in Q2 2026, buying an estimated $65.3K and bringing the position to 36,750 shares worth $555K. The position accounts for ﹤0.01% of the portfolio, ranked #2383.

Mariner first reported a position in TNDM in Q4 2023 and has held it in 11 quarters since. The position peaked at $781K in Q4 2025. 274 funds tracked by Wall St. Rank hold TNDM as of Q2 2026.

  • Mariner held 36,750 shares of Tandem Diabetes Care worth $555K as of Q2 2026.
  • Mariner bought 3,742 Tandem Diabetes Care shares in Q2 2026, an estimated $65.3K.
  • Tandem Diabetes Care made up ﹤0.01% of Mariner's portfolio in Q2 2026, its #2383 holding.
  • Mariner first reported a position in Tandem Diabetes Care in Q4 2023 and has held it in 11 quarters since.
  • Mariner's Tandem Diabetes Care position peaked at $781K in Q4 2025.
  • 274 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q2 2026.

Based on Mariner's 13F filing for Q2 2026, filed 13 Aug 2026.