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
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 $5.72T AUM 30.48% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

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 Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return

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 New York $145B AUM 34.61% 1-Year Est. Return

Dark Forest Capital Management's TNDM Position: Q4 2025 in Review

Dark Forest Capital Management sold out of Tandem Diabetes Care (TNDM) in Q4 2025, closing a stake of 75,535 shares — an estimated $917K sold.

Dark Forest Capital Management first reported a position in TNDM in Q4 2022 and held it in 10 quarters. The position peaked at $1.34M in Q1 2025. 268 funds tracked by Wall St. Rank hold TNDM as of Q4 2025.

Dark Forest Capital Management reported no remaining Tandem Diabetes Care position as of Q4 2025 after selling out during the quarter.
Dark Forest Capital Management sold 75,535 Tandem Diabetes Care shares in Q4 2025, an estimated $917K.
Dark Forest Capital Management first reported a position in Tandem Diabetes Care in Q4 2022 and held it in 10 quarters.
Dark Forest Capital Management's Tandem Diabetes Care position peaked at $1.34M in Q1 2025.
268 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q4 2025.

Based on Dark Forest Capital Management's 13F filing for Q4 2025, filed 17 Feb 2026.