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Deerfield Management’s Tandem Diabetes Care TNDM Stock Holding History

Deerfield 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
Q1 		– Sell
-26,090
Closed -$573K – 149
2025
Q4 		$573K Buy
26,090
+13,895
+114% +$251K 0.01% 128
2025
Q3 		$148K Buy
+12,195
New +$165K ﹤0.01% 144
2020
Q2 		– Sell
-412,867
Closed -$26.6M – 102
2020
Q1 		$26.6M Sell
412,867
-948,478
-70% -$66.5M 0.84% 37
2019
Q4 		$81.2M Buy
1,361,345
+907,011
+200% +$55.9M 2.59% 10
2019
Q3 		$26.8M Buy
454,334
+301,834
+198% +$19.3M 1.09% 31
2019
Q2 		$9.84M Buy
152,500
+117,000
+330% +$7.55M 0.35% 71
2019
Q1 		$2.25M Sell
35,500
-518,265
-94% -$27.2M 0.09% 85
2018
Q4 		$21M Buy
553,765
+270,650
+96% +$9.56M 0.84% 44
2018
Q3 		$12.1M Sell
283,115
-2,290,190
-89% -$80M 0.43% 64
2018
Q2 		$56.7M Buy
2,573,305
+2,255,305
+709% +$27.7M 1.99% 8
2018
Q1 		$1.58M Buy
+318,000
New +$1.03M 0.05% 114

Other funds holding TNDM

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
SC
Sessa Capital New York $5.51B AUM 47.23% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
ACH
ArrowMark Colorado Holdings Denver, Colorado $3.76B AUM 21.77% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
GKIM
GW&K Investment Management Boston, Massachusetts $11.3B AUM 31.98% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
DCM
Driehaus Capital Management Chicago, Illinois $13.6B AUM 173.98% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return

Deerfield Management's TNDM Position: Q1 2026 in Review

Deerfield Management sold out of Tandem Diabetes Care (TNDM) in Q1 2026, closing a stake of 26,090 shares — an estimated $573K sold.

Deerfield Management first reported a position in TNDM in Q1 2018 and held it in 11 quarters. The position peaked at $81.2M in Q4 2019. 272 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

  • Deerfield Management reported no remaining Tandem Diabetes Care position as of Q1 2026 after selling out during the quarter.
  • Deerfield Management sold 26,090 Tandem Diabetes Care shares in Q1 2026, an estimated $573K.
  • Deerfield Management first reported a position in Tandem Diabetes Care in Q1 2018 and held it in 11 quarters.
  • Deerfield Management's Tandem Diabetes Care position peaked at $81.2M in Q4 2019.
  • 272 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

Based on Deerfield Management's 13F filing for Q1 2026, filed 15 May 2026.