GW&K Investment Management, LLC
In its 13F for Q1 2026 (holdings as of March 31, 2026, filed May 13, 2026), GW&K Investment Management, LLC reported 1,019 stock positions worth $11.3 billion. Its top holding was Advanced Energy Industries (AEIS) at 1.7% of the portfolio, followed by Macom Technology Solutions H (MTSI, 1.6%) and RBC Bearings (RBC, 1.3%). Compared with Q4 2025, it opened 48 new positions, sold out of 26, added to 458 and reduced 407. The biggest buy was a new position in Coherent (COHR) and the biggest sale Bright Horizons Family Solut (BFAM, shares −100%).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0001082917
- Portfolio Value
- $11.3B (Q1 2026)
- SEC Filing
- 0001082917-26-000002 ↗ filed May 13, 2026
Holdings Value
Holdings 1,019 stocks · $11.3B
| AEIS Advanced Energy Industries | 1.71% | 601,105 | $194.0M | Reduce -11.8% |
| MTSI Macom Technology Solutions H | 1.64% | 839,062 | $186.3M | Reduce -31.1% |
| RBC RBC Bearings Inc. | 1.35% | 281,879 | $153.1M | Reduce -22.6% |
| ITT Itt Inc. | 1.34% | 796,746 | $151.8M | Reduce -7.4% |
| SPXC SPX Technologies Inc. | 1.19% | 675,142 | $135.0M | Add +28.8% |
| FIX Comfort Systems USA Inc. | 1.16% | 95,674 | $131.9M | Reduce -14.3% |
| GMED Globus Medical Inc. Class A | 1.14% | 1,494,723 | $128.8M | Reduce -1.4% |
| APG Api Group Corp. | 1.11% | 3,110,942 | $126.1M | Reduce -1.9% |
| STRL Sterling Infrastructure Inc. | 1.09% | 304,736 | $124.1M | Reduce -2.3% |
| LOPE Grand Canyon Education Inc. | 1.08% | 723,725 | $123.1M | Reduce -1.7% |
| BURL Burlington Stores Inc. | 0.97% | 339,458 | $110.5M | Reduce -0.5% |
| POWL Powell Industries Inc. | 0.96% | 200,535 | $108.5M | Reduce -21.2% |
| TXRH Texas Roadhouse Inc. | 0.93% | 638,849 | $105.5M | Reduce -2.1% |
| AVGO Broadcom Inc. | 0.92% | 336,789 | $104.2M | Reduce -14.9% |
| FSS Federal Signal Corp. | 0.91% | 958,124 | $103.6M | Add +69.7% |
| INSM Insmed Inc. | 0.90% | 623,048 | $101.9M | Add +29.1% |
| NOVT Novanta Inc. | 0.89% | 858,654 | $101.4M | Add +16.5% |
| MSFT Microsoft Corp. | 0.89% | 272,689 | $100.9M | Reduce -9.4% |
| IDA Idacorp Inc. | 0.88% | 699,780 | $100.0M | Reduce -2.4% |
| MTDR Matador Resources Co. | 0.87% | 1,558,564 | $98.5M | Reduce -0.8% |
| MGY Magnolia Oil & Gas Corp. Class A | 0.86% | 3,081,264 | $97.3M | Reduce -2.8% |
| SF Stifel Financial Corp. | 0.85% | 1,307,745 | $96.7M | Reduce -2.9% |
| MOG.A Moog Inc. Class A | 0.85% | 328,949 | $96.3M | Reduce -2.3% |
| JBL Jabil Inc. | 0.81% | 345,291 | $91.7M | Reduce -6.1% |
| GTES Gates Industrial Corp. UK Ltd. | 0.80% | 4,028,336 | $91.1M | Reduce -11.2% |
| HALO Halozyme Therapeutics Inc. | 0.79% | 1,393,875 | $90.1M | Add +11.1% |
| MEDP Medpace Holdings Inc. | 0.77% | 182,772 | $87.8M | Add +17.0% |
| ENTG Entegris Inc. | 0.76% | 739,056 | $86.6M | Reduce -1.2% |
| NDSN Nordson Corp. | 0.73% | 312,593 | $83.2M | Reduce -10.7% |
| PFGC Performance Food Group Co. | 0.73% | 966,899 | $82.8M | Reduce -0.7% |
| UMBF Umb Financial Corp. | 0.70% | 701,187 | $79.1M | Reduce -2.4% |
| CVCO Cavco Industries Inc. | 0.70% | 163,284 | $79.1M | Add +8.0% |
| NBIX Neurocrine Biosciences Inc. | 0.69% | 593,725 | $78.2M | Add +3.0% |
| BJ Bj's Wholesale Club Holdings filed as BJS WHSL CLUB HLDGS INC | 0.65% | 744,326 | $73.3M | Reduce -2.5% |
| AIT Applied Industrial Tech Inc. | 0.64% | 271,489 | $72.0M | Add +25.4% |
| BBIO Bridgebio Pharma Inc. | 0.63% | 962,643 | $71.5M | Add +53.8% |
| ESI Element Solutions Inc. | 0.62% | 2,076,164 | $70.9M | Reduce -13.2% |
| JAZZ Jazz Pharmaceuticals PLC | 0.62% | 371,098 | $70.2M | Reduce -13.2% |
| PIPR Piper Sandler Cos | 0.62% | 915,843 | $70.1M | Reduce -22.7% |
| VOYA Voya Financial Inc. | 0.61% | 1,019,038 | $69.6M | Add +10.3% |
| COHR Coherent Corp. | 0.60% | 287,335 | $68.4M | New |
| SITE Siteone Landscape Supply Inc. | 0.59% | 506,764 | $67.5M | Reduce -0.7% |
| ABBV Abbvie Inc. | 0.59% | 309,419 | $67.3M | Reduce -17.5% |
| FN Fabrinet | 0.59% | 128,323 | $66.9M | New |
| PM Philip Morris International | 0.58% | 397,723 | $65.8M | Reduce -1.5% |
| RPM RPM International Inc. | 0.57% | 646,163 | $64.2M | Add +14.8% |
| ETR Entergy Corp. | 0.56% | 568,684 | $63.9M | Reduce -1.6% |
| JPM JPMorgan Chase & Co. | 0.56% | 214,533 | $63.1M | Reduce -1.4% |
| CFG Citizens Financial Group | 0.56% | 1,050,635 | $63.0M | Reduce -1.5% |
| GBCI Glacier Bancorp Inc. | 0.56% | 1,409,101 | $62.9M | Add +5.8% |
| CHDN Churchill Downs Inc. | 0.53% | 668,398 | $60.0M | Reduce -2.0% |
| SEI Solaris Energy Infrastructur | 0.53% | 1,061,673 | $60.0M | Reduce -1.9% |
| PCOR Procore Technologies Inc. | 0.52% | 1,038,727 | $59.2M | Reduce -0.2% |
| VIAV Viavi Solutions Inc. | 0.52% | 1,771,881 | $59.0M | Reduce -30.6% |
| LECO Lincoln Electric Holdings | 0.52% | 236,216 | $58.8M | Add +13.7% |
| CRNX Crinetics Pharmaceuticals Inc. | 0.52% | 1,618,686 | $58.8M | Add +9.6% |
| IONS Ionis Pharmaceuticals Inc. | 0.52% | 779,349 | $58.5M | Reduce -0.9% |
| NVDA Nvidia Corp. | 0.51% | 331,483 | $57.8M | Reduce -2.0% |
| AUB Atlantic Union Bankshares Co. | 0.49% | 1,562,111 | $55.8M | Reduce -2.9% |
| WTFC Wintrust Financial Corp. | 0.49% | 399,035 | $55.4M | Reduce -3.0% |
| EXP Eagle Materials Inc. | 0.49% | 291,817 | $55.3M | Reduce -2.6% |
| AIZ Assurant Inc. | 0.49% | 253,068 | $55.1M | Reduce -2.5% |
| SUPN Supernus Pharmaceuticals Inc. | 0.48% | 1,055,184 | $54.5M | Reduce -2.4% |
| CNQ Canadian Natural Resources | 0.48% | 1,118,706 | $54.5M | Reduce -14.6% |
| DORM Dorman Products Inc. | 0.47% | 513,688 | $53.6M | Reduce -3.0% |
| RTX RTX Corp. | 0.47% | 276,484 | $53.3M | Reduce -1.5% |
| CGNX Cognex Corp. | 0.47% | 1,081,714 | $53.0M | Reduce -29.0% |
| EGP Eastgroup Properties Inc. | 0.47% | 285,455 | $52.8M | Reduce -0.8% |
| VCEL Vericel Corp. | 0.46% | 1,616,855 | $52.0M | Add +2.3% |
| CFR Cullen/Frost Bankers Inc. | 0.45% | 376,177 | $51.6M | Reduce -1.9% |
| TNDM Tandem Diabetes Care Inc. | 0.45% | 2,689,106 | $51.5M | Add +0.5% |
| KNSL Kinsale Capital Group Inc. | 0.45% | 150,583 | $51.5M | Reduce -1.3% |
| VNOM Viper Energy Inc. Class A | 0.45% | 1,094,719 | $51.4M | Reduce -0.6% |
| HLI Houlihan Lokey Inc. | 0.45% | 354,095 | $50.9M | Reduce -0.6% |
| SUI Sun Communities Inc. filed as SUN CMNTYS INC | 0.44% | 392,920 | $49.5M | Reduce -1.3% |
| LEVI Levi Strauss & Co. Class A | 0.43% | 2,660,516 | $49.2M | Add +19.9% |
| KWR Quaker Chemical Corporation | 0.43% | 395,965 | $49.2M | Reduce -2.5% |
| BIO Bio-Rad Laboratories-A | 0.43% | 174,708 | $48.7M | Reduce -1.3% |
| NTRA Natera Inc. | 0.43% | 242,020 | $48.4M | Reduce -0.8% |
| MS Morgan Stanley | 0.43% | 293,468 | $48.3M | Reduce -1.8% |
| THR Thermon Group Holdings Inc. | 0.42% | 952,518 | $48.0M | Reduce -41.5% |
| AVNT Avient Corp. | 0.42% | 1,317,292 | $47.8M | Add +1.1% |
| PNFP Pinnacle Financial Partners | 0.41% | 545,376 | $47.0M | New |
| ALLE Allegion PLC | 0.41% | 321,103 | $46.7M | Add +46.1% |
| ITGR Integer Holdings Corp. | 0.41% | 527,943 | $46.5M | Reduce -1.3% |
| VCYT Veracyte Inc. | 0.41% | 1,437,322 | $46.3M | Add +26.1% |
| ORI Old Republic Intl Corp. | 0.41% | 1,152,109 | $46.0M | Reduce -2.0% |
| CSW CSW Industrials Inc. | 0.40% | 173,179 | $45.1M | Add +8.8% |
| GOOGL Alphabet Inc. Class A | 0.39% | 153,687 | $44.2M | Reduce -2.0% |
| SBCF Seacoast Banking Corp. | 0.39% | 1,454,745 | $44.1M | Reduce -0.9% |
| FERG Ferguson Enterprises Inc. | 0.39% | 188,521 | $44.0M | Reduce -1.6% |
| OVV Ovintiv Inc. | 0.38% | 734,510 | $43.6M | Reduce -1.8% |
| POR Portland General Electric Co. | 0.38% | 824,649 | $43.5M | Reduce -2.9% |
| CW Curtiss-Wright Corp. | 0.38% | 63,033 | $42.9M | New |
| QSR Restaurant Brands Intern | 0.38% | 578,531 | $42.8M | Reduce -1.6% |
| AR Antero Resources Corp. | 0.38% | 1,007,300 | $42.8M | Reduce -0.6% |
| ABCB Ameris Bancorp | 0.37% | 544,906 | $42.5M | Reduce -2.6% |
| ADC Agree Realty Corp. | 0.37% | 556,104 | $41.9M | Reduce -38.7% |
| FAST Fastenal Co. | 0.37% | 897,342 | $41.6M | Reduce -1.4% |
| AGIO Agios Pharmaceuticals Inc. | 0.36% | 1,214,901 | $41.1M | Add +0.6% |
Other holdings (1): bonds, preferreds, convertibles and warrants · $0 (not counted above)
| Security | Class | Shares / Principal | Value | Change |
|---|---|---|---|---|
| OXY.WS Occidental Petroleum-CW27 | *W EXP 08/03/202 | 1 | $0 | No change |
Portfolio Sells Q4 2025 → Q1 2026
| BFAM Bright Horizons Family Solut | Reduce -99.8% | 0.00% | −0.45 |
| PNFP Pinnacle Financial Partners | Sold out | 0.00% | −0.38 |
| MSFT Microsoft Corp. | Reduce -9.4% | 0.89% | −0.37 |
| TTAN Servicetitan Inc. Class A | Reduce -99.9% | 0.00% | −0.33 |
| WSO Watsco Inc. | Reduce -96.7% | 0.01% | −0.31 |
| TPH Tri Pointe Homes Inc. | Reduce -72.8% | 0.21% | −0.30 |
| THRM Gentherm Inc. | Reduce -99.8% | 0.00% | −0.27 |
| AVGO Broadcom Inc. | Reduce -14.9% | 0.92% | −0.26 |
| AZTA Azenta Inc. | Reduce -37.2% | 0.18% | −0.26 |
| LITE Lumentum Holdings Inc. | Reduce -99.9% | 0.00% | −0.26 |
| MRK Merck & Co. Inc. | Reduce -96.4% | 0.01% | −0.26 |
| PIPR Piper Sandler Cos | Reduce -22.7% | 0.62% | −0.25 |
| CBZ Cbiz Inc. | Reduce -38.6% | 0.11% | −0.23 |
| AMT American Tower Corp. | Reduce -96.2% | 0.01% | −0.22 |
| UNH Unitedhealth Group Inc. | Reduce -93.7% | 0.01% | −0.22 |
| AVAV Aerovironment Inc. | Reduce -30.6% | 0.25% | −0.22 |
| COLB Columbia Banking System Inc. | Reduce -91.0% | 0.02% | −0.21 |
| SAIL Sailpoint Inc. | Reduce -4.0% | 0.36% | −0.20 |
| ADC Agree Realty Corp. | Reduce -38.7% | 0.37% | −0.20 |
| FTAI Ftai Aviation Ltd. | Reduce -49.4% | 0.34% | −0.19 |
| INTA Intapp Inc. | Reduce -4.5% | 0.21% | −0.17 |
| SLGN Silgan Holdings Inc. | Reduce -88.7% | 0.02% | −0.17 |
| DSGX The Descartes Systems Grp | Reduce -41.7% | 0.16% | −0.17 |
| CSCO Cisco Systems Inc. | Reduce -44.6% | 0.22% | −0.16 |
| BBSI Barrett Business SVCS Inc. | Sold out | 0.00% | −0.16 |
| MTSI Macom Technology Solutions H | Reduce -31.1% | 1.64% | −0.16 |
| ENB Enbridge Inc. | Reduce -44.5% | 0.27% | −0.15 |
| ABBV Abbvie Inc. | Reduce -17.5% | 0.59% | −0.15 |
| CHDN Churchill Downs Inc. | Reduce -2.0% | 0.53% | −0.14 |
| PCTY Paylocity Holding Corp. | Reduce -2.7% | 0.32% | −0.14 |
| PCOR Procore Technologies Inc. | Reduce -0.2% | 0.52% | −0.13 |
| NOW ServiceNow Inc. | Reduce -92.5% | 0.01% | −0.13 |
| PAYX Paychex Inc. | Reduce -30.2% | 0.17% | −0.12 |
| APPF Appfolio Inc. Class A | Reduce -15.0% | 0.18% | −0.12 |
| TILE Interface Inc. | Reduce -44.8% | 0.12% | −0.12 |
| SF Stifel Financial Corp. | Reduce -2.9% | 0.85% | −0.12 |
| KD Kyndryl Holdings Inc. | Reduce -100.0% | 0.00% | −0.12 |
| LIN Linde PLC | Reduce -43.6% | 0.24% | −0.12 |
| SNDR Schneider National Inc. Class B | Reduce -29.6% | 0.29% | −0.12 |
| GPI Group 1 Automotive Inc. | Reduce -8.9% | 0.36% | −0.10 |
| THR Thermon Group Holdings Inc. | Reduce -41.5% | 0.42% | −0.10 |
| IWM iShares Russell 2000 ETF | Reduce -30.8% | 0.24% | −0.10 |
| PAR Par Technology Corp. | Reduce -76.4% | 0.01% | −0.09 |
| ABT Abbott Laboratories | Reduce -11.3% | 0.27% | −0.09 |
| DORM Dorman Products Inc. | Reduce -3.0% | 0.47% | −0.09 |
| META Meta Platforms Inc. Class A | Reduce -38.5% | 0.11% | −0.09 |
| HLI Houlihan Lokey Inc. | Reduce -0.6% | 0.45% | −0.09 |
| LPLA LPL Financial Holdings Inc. | Reduce -47.4% | 0.07% | −0.09 |
| NEO Neogenomics Inc. | Reduce -2.1% | 0.14% | −0.08 |
| FWRG First Watch Restaurant Group | Reduce -3.6% | 0.18% | −0.08 |
Portfolio Buys Q4 2025 → Q1 2026
| COHR Coherent Corp. | New | 0.60% | +0.60 |
| FN Fabrinet | New | 0.59% | +0.59 |
| PNFP Pinnacle Financial Partners | New | 0.41% | +0.41 |
| FSS Federal Signal Corp. | Add +69.7% | 0.91% | +0.38 |
| CW Curtiss-Wright Corp. | New | 0.38% | +0.38 |
| TSM Taiwan Semiconductor-SP ADR | New | 0.32% | +0.32 |
| LCII Lci Industries | New | 0.28% | +0.28 |
| PLNT Planet Fitness Inc. Class A | New | 0.28% | +0.28 |
| SPXC SPX Technologies Inc. | Add +28.8% | 1.19% | +0.28 |
| TXN Texas Instruments Inc. | Add +17760.6% | 0.27% | +0.27 |
| WMB Williams Cos Inc. | Add +47635.1% | 0.26% | +0.26 |
| MCHP Microchip Technology Inc. | Add +28566.8% | 0.23% | +0.23 |
| DELL Dell Technologies -C | Add +25479.5% | 0.22% | +0.22 |
| BBIO Bridgebio Pharma Inc. | Add +53.8% | 0.63% | +0.22 |
| ETN Eaton Corp. PLC | Add +9647.4% | 0.21% | +0.20 |
| AMCR Amcor PLC | Add +214133.3% | 0.17% | +0.17 |
| INSM Insmed Inc. | Add +29.1% | 0.90% | +0.17 |
| GPC Genuine Parts Co. | Add +179117.9% | 0.16% | +0.16 |
| AIT Applied Industrial Tech Inc. | Add +25.4% | 0.64% | +0.15 |
| FDS Factset Research Systems Inc. | Add +131201.8% | 0.14% | +0.14 |
| TRI Thomson Reuters Corp. | New | 0.14% | +0.14 |
| NOVT Novanta Inc. | Add +16.5% | 0.89% | +0.14 |
| LGN Legence Corp. Class A | Add +22.7% | 0.30% | +0.12 |
| ARES Ares Management Corp. Class A | Add +20656.7% | 0.11% | +0.11 |
| ALLE Allegion PLC | Add +46.1% | 0.41% | +0.11 |
| APH Amphenol Corp. Class A | Add +4284.2% | 0.10% | +0.10 |
| CHRD Chord Energy Corp. | Add +3.3% | 0.26% | +0.10 |
| LECO Lincoln Electric Holdings | Add +13.7% | 0.52% | +0.09 |
| AGIO Agios Pharmaceuticals Inc. | Add +0.6% | 0.36% | +0.08 |
| VVV Valvoline Inc. | Add +67.4% | 0.15% | +0.08 |
| LGND Ligand Pharmaceuticals | Add +27.3% | 0.26% | +0.07 |
| AVNT Avient Corp. | Add +1.1% | 0.42% | +0.07 |
| FLEX Flex Ltd. | New | 0.07% | +0.07 |
| LRN Stride Inc. | Add +8.0% | 0.19% | +0.06 |
| XOMA Xoma Royalty Corporation | New | 0.06% | +0.06 |
| HALO Halozyme Therapeutics Inc. | Add +11.1% | 0.79% | +0.06 |
| SMTC Semtech Corp. | Add +15.7% | 0.32% | +0.06 |
| RPM RPM International Inc. | Add +14.8% | 0.57% | +0.06 |
| BCRX Biocryst Pharmaceuticals Inc. | Add +2.5% | 0.27% | +0.06 |
| MASI Masimo Corp. | Add +2.9% | 0.19% | +0.06 |
| FICO Fair Isaac Corp. | Add +209.7% | 0.12% | +0.06 |
| NHI Natl Health Investors Inc. | Add +19.3% | 0.24% | +0.05 |
| PWP Perella Weinberg Partners | Add +32.2% | 0.17% | +0.05 |
| RHP Ryman Hospitality Properties | Add +21.2% | 0.29% | +0.05 |
| GBCI Glacier Bancorp Inc. | Add +5.8% | 0.56% | +0.05 |
| EPAC Enerpac Tool Group Corp. | Add +20.1% | 0.30% | +0.04 |
| ACHC Acadia Healthcare Co. Inc. | Add +41.8% | 0.07% | +0.04 |
| IDEV iShares Core MSCI Dev MKTS | Add +54.2% | 0.11% | +0.04 |
| CATY Cathay General Bancorp | Add +10.6% | 0.29% | +0.04 |
| LEVI Levi Strauss & Co. Class A | Add +19.9% | 0.43% | +0.04 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 1,107 | $12.8B | MTSI, AEIS, SPXC, STRL, ITT |
| Q1 2026 | 1,019 | $11.3B | AEIS, MTSI, RBC, ITT, SPXC |
| Q4 2025 | 996 | $11.6B | MTSI, RBC, ITT, MSFT, AEIS |
| Q3 2025 | 999 | $11.3B | MSFT, RBC, FIX, MTSI, LOPE |
| Q2 2025 | 991 | $11.2B | MTSI, RBC, AVGO, MSFT, TXRH |
| Q1 2025 | 1,010 | $10.8B | RBC, TXRH, MTSI, GMED, MSFT |
| Q4 2024 | 973 | $11.8B | TXRH, MTSI, CYBR, GMED, RBC |
| Q3 2024 | 960 | $11.7B | TXRH, RBC, MSFT, CYBR, MTSI |
| Q2 2024 | 942 | $10.9B | TXRH, MSFT, MTSI, RBC, CYBR |
| Q1 2024 | 927 | $11.3B | TXRH, MSFT, RBC, ENTG, MTDR |