Dark Forest Capital Management’s Tandem Diabetes Care TNDM Stock Holding History

Dark Forest Capital Management’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	$263K	Buy	+17,430	New	+$304K	0.02%	748
2025 Q4	–	Sell	-75,535	Closed	-$917K	–	1349
2025 Q3	$917K	Buy	75,535 +14,533	+24%	+$197K	0.03%	772
2025 Q2	$1.14M	Sell	61,002 -9,126	-13%	-$181K	0.05%	694
2025 Q1	$1.34M	Buy	+70,128	New	+$2.05M	0.06%	543
2024 Q4	–	Sell	-4,816	Closed	-$204K	–	1285
2024 Q3	$204K	Sell	4,816 -3,239	-40%	-$137K	0.03%	865
2024 Q2	$325K	Buy	+8,055	New	+$336K	0.06%	418
2024 Q1	–	Sell	-21,232	Closed	-$628K	–	779
2023 Q4	$628K	Sell	21,232 -37,478	-64%	-$777K	0.09%	190
2023 Q3	$1.22M	Buy	58,710 +41,769	+247%	+$1.15M	0.09%	330
2023 Q2	$416K	Buy	16,941 +11,185	+194%	+$360K	0.04%	700
2023 Q1	$234K	Buy	5,756 +5,734	+26,064%	+$237K	0.06%	323
2022 Q4	$989	Buy	+22	New	+$996	﹤0.01%	989

Other funds holding TNDM

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Sessa Capital New York $5.98B AUM 99.85% 1-Year Est. Return

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 Malvern, Pennsylvania $4.68T AUM

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 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 Florham Park, New Jersey $27.8B AUM 46.46% 1-Year Est. Return

Dark Forest Capital Management's TNDM Position: Q2 2026 in Review

Dark Forest Capital Management opened a new position in Tandem Diabetes Care (TNDM) in Q2 2026: 17,430 shares worth $263K. The stake represents 0.02% of the portfolio and ranks #748 among its holdings. This is a return to the name: Dark Forest Capital Management previously reported a position in TNDM as recently as Q3 2025.

Dark Forest Capital Management first reported a position in TNDM in Q4 2022 and has held it in 11 quarters since. The position peaked at $1.34M in Q1 2025. 274 funds tracked by Wall St. Rank hold TNDM as of Q2 2026.

Dark Forest Capital Management held 17,430 shares of Tandem Diabetes Care worth $263K as of Q2 2026.
Tandem Diabetes Care was a new Dark Forest Capital Management position in Q2 2026.
Tandem Diabetes Care made up 0.02% of Dark Forest Capital Management's portfolio in Q2 2026, its #748 holding.
Dark Forest Capital Management first reported a position in Tandem Diabetes Care in Q4 2022 and has held it in 11 quarters since.
Dark Forest Capital Management's Tandem Diabetes Care position peaked at $1.34M in Q1 2025.
274 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q2 2026.

Based on Dark Forest Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.