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Oberweis Asset Management’s Tandem Diabetes Care TNDM Stock Holding History

Oberweis Asset 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
Q1 		– Sell
-506,600
Closed -$18.2M – 213
2024
Q4 		$18.2M Buy
506,600
+58,550
+13% +$1.98M 0.86% 35
2024
Q3 		$19M Buy
448,050
+166,050
+59% +$7.04M 0.97% 25
2024
Q2 		$11.4M Buy
+282,000
New +$11.8M 0.7% 51
2021
Q1 		– Sell
-36,980
Closed -$3.54M – 181
2020
Q4 		$3.54M Sell
36,980
-16,390
-31% -$1.69M 0.93% 16
2020
Q3 		$6.06M Sell
53,370
-5,855
-10% -$615K 2.04% 8
2020
Q2 		$5.86M Sell
59,225
-8,405
-12% -$671K 2.3% 9
2020
Q1 		$4.35M Sell
67,630
-42,310
-38% -$2.96M 2.4% 6
2019
Q4 		$6.55M Sell
109,940
-89,470
-45% -$5.52M 2.18% 6
2019
Q3 		$11.8M Sell
199,410
-16,510
-8% -$1.05M 2.66% 5
2019
Q2 		$13.9M Buy
215,920
+24,800
+13% +$1.6M 2.53% 5
2019
Q1 		$12.1M Sell
191,120
-33,740
-15% -$1.77M 2.44% 6
2018
Q4 		$8.54M Sell
224,860
-190
-0.1% -$6.71K 1.91% 7
2018
Q3 		$9.64M Buy
+225,050
New +$7.86M 1.87% 9

Other funds holding TNDM

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
SC
Sessa Capital New York $5.51B AUM 47.23% 1-Year Est. Return
GKIM
GW&K Investment Management Boston, Massachusetts $11.3B AUM 31.98% 1-Year Est. Return
ACH
ArrowMark Colorado Holdings Denver, Colorado $3.76B AUM 21.77% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
HRCM
Hood River Capital Management Palm Beach Gardens, Florida $9.98B AUM 145.42% 1-Year Est. Return
SIMG
Stephens Investment Management Group Houston, Texas $7.3B AUM 41.96% 1-Year Est. Return
PIM
Paradice Investment Management Denver, Colorado $532M AUM 29.6% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Oberweis Asset Management's TNDM Position: Q1 2025 in Review

Oberweis Asset Management sold out of Tandem Diabetes Care (TNDM) in Q1 2025, closing a stake of 506,600 shares — an estimated $18.2M sold.

Oberweis Asset Management first reported a position in TNDM in Q3 2018 and held it in 13 quarters. The position peaked at $19M in Q3 2024. 275 funds tracked by Wall St. Rank hold TNDM as of Q1 2025.

  • Oberweis Asset Management reported no remaining Tandem Diabetes Care position as of Q1 2025 after selling out during the quarter.
  • Oberweis Asset Management sold 506,600 Tandem Diabetes Care shares in Q1 2025, an estimated $18.2M.
  • Oberweis Asset Management first reported a position in Tandem Diabetes Care in Q3 2018 and held it in 13 quarters.
  • Oberweis Asset Management's Tandem Diabetes Care position peaked at $19M in Q3 2024.
  • 275 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2025.

Based on Oberweis Asset Management's 13F filing for Q1 2025, filed 15 May 2025.