Q2 2026 13F · SEC CIK 1082917

GW&K Investment Management, LLC

Wealth managerFiled 2026-08-12 for Q2 2026. Open the filing ↗ · All SEC filings ↗

Reported 13F value: $12.8B
Reported positions: 1,084
Top holdings a year, 3 yrs: +24.4%
Assets under management: $52.8B

GW&K Investment Management, LLC is a wealth manager that reported 1,084 positions worth $12.8B in its Q2 2026 13F, filed 2026-08-12. Its largest holdings were Macom Tech Solutions Hldgs I (MTSI, 1.9%), Advanced Energy Inds Inc (AEIS, 1.7%), Spx Technologies Inc (SPXC, 1.4%). A portfolio copying its top holdings returned 24.4% a year over the last 3 years, against 20.4% for the S&P 500.

GW&K Investment Management, LLC holdings largest 50 of 1,084 positions.

Weights are shares of the filer's total reported 13F value, compared with Q1 2026. Share changes may reflect splits; weight changes also reflect price moves. A 13F shows long US-listed positions only, up to 135 days after the fact.

GW&K Investment Management, LLC 13F holdings
Stock	% of 13F value	Q1 2026	Shares	Share change	Reported value
MTSIMacom Tech Solutions Hldgs I	1.9%	1.6%	634,742	-24.4%	$241.4M
AEISAdvanced Energy Inds Inc	1.7%	1.7%	577,834	-3.9%	$215.5M
SPXCSpx Technologies Inc	1.4%	1.2%	713,791	+5.7%	$175.0M
STRLSterling Infrastructure Inc	1.3%	1.1%	197,645	-35.1%	$165.9M
ITTItt	1.2%	1.3%	764,125	-4.1%	$151.1M
NOVTNovanta Inc	1.1%	0.9%	897,268	+4.5%	$145.6M
ROLLRbc Bearings Incorporated	1.1%	1.4%	224,336	-20.4%	$144.5M
MOG-AMoog Inc	1.0%	0.8%	311,540	-5.3%	$132.0M
ENTGEntegris Inc	1.0%	0.8%	696,739	-5.7%	$125.3M
APGApi Group Corp	1.0%	1.1%	2,956,543	-5.0%	$125.2M
TXRHTexas Roadhouse Inc	1.0%	0.9%	644,226	+0.8%	$124.5M
FSSFederal Signal Corp	0.9%	0.9%	926,454	-3.3%	$119.0M
FNFabrinet	0.9%	0.6%	210,752	+64.2%	$118.5M
POWLPowell Inds Inc	0.9%	1.0%	410,122	+104.5%	$117.4M
GMEDGlobus Med Inc	0.9%	1.1%	1,453,206	-2.8%	$114.8M
COHRCoherent Corp	0.9%	0.6%	285,545	-0.6%	$112.6M
G39108108Gates Indl Corp PLC Ord Shs	0.8%	0.8%	3,826,871	-5.0%	$107.0M
HALOHalozyme Therapeutics Inc	0.8%	0.8%	1,353,883	-2.9%	$106.0M
PFGCPerformance Food Group Co	0.8%	0.7%	927,410	-4.1%	$103.7M
BURLBurlington Stores	0.8%	1.0%	324,761	-4.3%	$102.9M
AVGOBroadcom Inc	0.8%	0.9%	272,092	-19.2%	$102.8M
IDAIdacorp Inc	0.8%	0.9%	668,455	-4.5%	$101.1M
MSFTMicrosoft Corp	0.8%	0.9%	269,177	-1.3%	$100.4M
UMBFUmb Finl Corp	0.8%	0.7%	672,465	-4.1%	$96.0M
NBIXNeurocrine Biosciences Inc	0.7%	0.7%	567,421	-4.4%	$95.6M
CVCOCavco Inds Inc Del	0.7%	0.7%	153,439	-6.0%	$94.3M
ESIElement Solutions Inc	0.7%	0.6%	1,937,614	-6.7%	$92.5M
MEDPMedpace Hldgs Inc	0.7%	0.8%	172,696	-5.5%	$91.5M
NDSNNordson Corp	0.7%	0.7%	293,653	-6.1%	$88.6M
LOPEGrand Canyon Ed Inc	0.7%	1.1%	616,654	-14.8%	$88.3M
VOYAVoya Financial, Inc.	0.7%	0.6%	964,138	-5.4%	$87.3M
AITApplied Indl Technologies in	0.7%	0.6%	257,886	-5.0%	$87.2M
SFStifel Finl Corp	0.7%	0.9%	1,247,030	-4.6%	$87.0M
FIXComfort Sys USA Inc	0.7%	1.2%	43,819	-54.2%	$86.9M
JBLJabil Inc	0.7%	0.8%	219,538	-36.4%	$84.6M
JAZZJazz Pharmaceuticals PLC	0.7%	0.6%	350,667	-5.5%	$84.5M
BBIOBridgebio Pharma Inc	0.7%	0.6%	1,125,131	+16.9%	$83.8M
SOISolaris Energy Infrastructure Inc	0.7%	—	1,038,119	—	$83.5M
VCYTVeracyte Inc	0.7%	—	1,416,543	—	$83.2M
RHPRyman Hospitality Pptys Inc	0.6%	—	615,786	—	$79.2M
CYTKCytokinetics	0.6%	—	916,107	—	$78.0M
LGNDLigand Pharmaceuticals Inc	0.6%	—	246,883	—	$78.0M
DELLDell Technologies Inc	0.6%	—	176,499	—	$76.2M
MGYMagnolia Oil & Gas Corp	0.6%	0.9%	2,917,419	-5.3%	$74.6M
CGNXCognex Corp	0.6%	—	1,020,371	—	$73.9M
BJBjs Whsl Club Hldgs Inc Com	0.6%	0.6%	837,052	+12.5%	$73.0M
CFGCitizens Finl Group Inc	0.6%	0.6%	1,033,943	-1.6%	$72.4M
PMPhilip Morris Intl Inc	0.6%	0.6%	391,260	-1.6%	$70.8M
DCODucommun Inc Del	0.6%	—	381,545	—	$70.7M
GBCIGlacier Bancorp Inc New	0.5%	0.6%	1,348,072	-4.3%	$69.5M

What GW&K Investment Management, LLC bought and sold in Q2 2026, against Q1 2026.

New positions

Q1 2026's filing was too long to tell new positions apart.

Share counts compared with the Q1 2026 13F; a split also changes share counts. The latest filing lists more than 50 positions, so a position that left the top 50 may still be held.

How the holdings did against the S&P 500.

1 year: +41.0% /yr; S&P 500 +20.1%
3 years: +24.4% /yr; S&P 500 +20.4%
5 years: +11.3% /yr; S&P 500 +11.6%

A portfolio of the filer's 20 largest 13F positions, weighted by value, bought the trading day after each 13F was filed and held until the next one was: what copying this filer could have earned. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.

Reported 13F value by quarter.

13F value by quarter
Quarter	13F value	Positions
Q2 2026	$12.8B	1,084
Q1 2026	$11.3B	1,013
Q4 2025	$11.6B	991
Q3 2025	$11.3B	992
Q2 2025	$11.2B	985
Q1 2025	$10.8B	1,004
Q4 2024	$11.8B	967
Q3 2024	$11.7B	955
Q2 2024	$10.9B	935
Q1 2024	$11.3B	917
Q4 2023	$10.7B	925
Q3 2023	$10.0B	908

Questions about GW&K Investment Management, LLC's portfolio

What stocks does GW&K Investment Management, LLC own?

GW&K Investment Management, LLC's latest 13F, for Q2 2026 and filed Aug 12, 2026, lists 1,084 positions worth $12.8B. The largest are Macom Tech Solutions Hldgs I (MTSI) at 1.9%, Advanced Energy Inds Inc (AEIS) at 1.7%, Spx Technologies Inc (SPXC) at 1.4%, Sterling Infrastructure Inc (STRL) at 1.3% and Itt (ITT) at 1.2%.

What did GW&K Investment Management, LLC buy last quarter?

In Q2 2026, GW&K Investment Management, LLC added Powell Inds Inc (POWL) (+104.5% shares), Fabrinet (FN) (+64.2% shares) and Bridgebio Pharma Inc (BBIO) (+16.9% shares), compared with its Q1 2026 filing.

What did GW&K Investment Management, LLC sell last quarter?

In Q2 2026, GW&K Investment Management, LLC cut from its top 50 Insmed Inc (INSM), cut from its top 50 Matador Resources Co. (MTDR), cut from its top 50 Piper Sandler Companies (PIPR), cut from its top 50 Siteone Landscape Supply Inc (SITE), cut from its top 50 Abbvie Inc (ABBV), Comfort Sys USA Inc (FIX) (-54.2% shares), Jabil Inc (JBL) (-36.4% shares) and Sterling Infrastructure Inc (STRL) (-35.1% shares), compared with its Q1 2026 filing.

How has GW&K Investment Management, LLC's portfolio performed?

A portfolio copying GW&K Investment Management, LLC's 20 largest 13F holdings each quarter, from the day each filing was public, returned +24.4% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +41.0% against +20.1%. Over 5 years: +11.3% a year against +11.6%.

When is GW&K Investment Management, LLC's next 13F filing due?

13F filings are due 45 days after each quarter ends. GW&K Investment Management, LLC's filing for the quarter ending Sep 30, 2026 is due by Nov 14, 2026; this page updates the day after it is published.

How much money does GW&K Investment Management, LLC manage?

GW&K Investment Management, LLC reported $52.8B of regulatory assets under management on its latest SEC Form ADV. Its 13F, which covers only US-listed stocks and options, totals $12.8B.