GW&K Investment Management’s Tandem Diabetes Care TNDM Stock Holding History

GW&K Investment 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	$38.8M	Sell	2,569,032 -120,074	-4%	-$2.1M	0.3%	119
2026 Q1	$51.5M	Buy	2,689,106 +13,949	+0.5%	+$303K	0.45%	71
2025 Q4	$58.8M	Sell	2,675,157 -46,492	-2%	-$839K	0.51%	59
2025 Q3	$33M	Sell	2,721,649 -168,481	-6%	-$2.28M	0.29%	133
2025 Q2	$53.9M	Buy	2,890,130 +26,143	+0.9%	+$518K	0.48%	67
2025 Q1	$54.9M	Buy	2,863,987 +740,499	+35%	+$21.7M	0.51%	62
2024 Q4	$76.5M	Buy	2,123,488 +323,674	+18%	+$10.9M	0.65%	37
2024 Q3	$76.3M	Buy	1,799,814 +456,703	+34%	+$19.4M	0.65%	33
2024 Q2	$54.1M	Buy	1,343,111 +37,202	+3%	+$1.55M	0.49%	72
2024 Q1	$46.2M	Buy	1,305,909 +79,151	+6%	+$2.12M	0.41%	96
2023 Q4	$36.3M	Buy	+1,226,758	New	+$25.4M	0.34%	125

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

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

FGP

Freestone Grove Partners San Francisco, California $15.6B AUM 27.39% 1-Year Est. Return

GW&K Investment Management's TNDM Position: Q2 2026 in Review

GW&K Investment Management reduced its Tandem Diabetes Care (TNDM) stake by 4.5% in Q2 2026, selling an estimated $2.1M and leaving 2,569,032 shares worth $38.8M. The position accounts for 0.3% of the portfolio, ranked #119.

GW&K Investment Management first reported a position in TNDM in Q4 2023 and has held it in 11 quarters since. The position peaked at $76.5M in Q4 2024. 273 funds tracked by Wall St. Rank hold TNDM as of Q2 2026.

GW&K Investment Management held 2,569,032 shares of Tandem Diabetes Care worth $38.8M as of Q2 2026.
GW&K Investment Management sold 120,074 Tandem Diabetes Care shares in Q2 2026, an estimated $2.1M.
Tandem Diabetes Care made up 0.3% of GW&K Investment Management's portfolio in Q2 2026, its #119 holding.
GW&K Investment Management first reported a position in Tandem Diabetes Care in Q4 2023 and has held it in 11 quarters since.
GW&K Investment Management's Tandem Diabetes Care position peaked at $76.5M in Q4 2024.
273 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q2 2026.

Based on GW&K Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.