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Nierenberg Investment Management Company’s Tandem Diabetes Care TNDM Stock Holding History

Nierenberg Investment Management Company’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 		$2.4M Buy
158,910
+79,400
+100% +$1.39M 1.19% 14
2026
Q1 		$1.52M Buy
79,510
+34,955
+78% +$760K 0.76% 17
2025
Q4 		$979K Buy
+44,555
New +$804K 0.48% 21

Other funds holding TNDM

BlackRock
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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
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
SCM
Soleus Capital Management Greenwich, Connecticut $2.9B AUM 169.69% 1-Year Est. Return
Bank of Montreal
Bank of Montreal Toronto, Ontario, Canada $304B AUM 35.64% 1-Year Est. Return
Aberdeen Group
Aberdeen Group Edinburgh, United Kingdom $71.2B AUM 41.74% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

Nierenberg Investment Management Company's TNDM Position: Q2 2026 in Review

Nierenberg Investment Management Company increased its Tandem Diabetes Care (TNDM) stake by 100% in Q2 2026, buying an estimated $1.39M and bringing the position to 158,910 shares worth $2.4M. The position accounts for 1.19% of the portfolio, ranked #14.

Nierenberg Investment Management Company first reported a position in TNDM in Q4 2025 and has held it in 3 quarters since. 150 funds tracked by Wall St. Rank hold TNDM as of Q2 2026.

  • Nierenberg Investment Management Company held 158,910 shares of Tandem Diabetes Care worth $2.4M as of Q2 2026.
  • Nierenberg Investment Management Company bought 79,400 Tandem Diabetes Care shares in Q2 2026, an estimated $1.39M.
  • Tandem Diabetes Care made up 1.19% of Nierenberg Investment Management Company's portfolio in Q2 2026, its #14 holding.
  • Nierenberg Investment Management Company first reported a position in Tandem Diabetes Care in Q4 2025 and has held it in 3 quarters since.
  • 150 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q2 2026.

Based on Nierenberg Investment Management Company's 13F filing for Q2 2026, filed 11 Aug 2026.