GW&K Investment Management, LLC
In its 13F for Q2 2026 (holdings as of June 30, 2026, filed August 12, 2026), GW&K Investment Management, LLC reported 1,107 stock positions worth $12.8 billion. Its top holding was Macom Technology Solutions H (MTSI) at 1.9% of the portfolio, followed by Advanced Energy Industries (AEIS, 1.7%) and SPX Technologies (SPXC, 1.4%). Compared with Q1 2026, it opened 114 new positions, sold out of 27, added to 331 and reduced 515. The biggest buy was a new position in Ceco Environmental (CECO) and the biggest sale Comfort Systems USA (FIX, shares −54%).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0001082917
- Portfolio Value
- $12.8B (Q2 2026)
- SEC Filing
- 0001082917-26-000003 ↗ filed Aug 12, 2026
Holdings Value
Holdings 1,107 stocks · $12.8B
| MTSI Macom Technology Solutions H | 1.89% | 634,742 | $241.4M | Reduce -24.4% |
| AEIS Advanced Energy Industries | 1.68% | 577,834 | $215.5M | Reduce -3.9% |
| SPXC SPX Technologies Inc. | 1.37% | 713,791 | $175.0M | Add +5.7% |
| STRL Sterling Infrastructure Inc. | 1.30% | 197,645 | $165.9M | Reduce -35.1% |
| ITT Itt Inc. | 1.18% | 764,125 | $151.1M | Reduce -4.1% |
| NOVT Novanta Inc. | 1.14% | 897,268 | $145.6M | Add +4.5% |
| RBC RBC Bearings Inc. | 1.13% | 224,336 | $144.5M | Reduce -20.4% |
| MOG.A Moog Inc. Class A | 1.03% | 311,540 | $132.0M | Reduce -5.3% |
| ENTG Entegris Inc. | 0.98% | 696,739 | $125.3M | Reduce -5.7% |
| APG Api Group Corp. | 0.98% | 2,956,543 | $125.2M | Reduce -5.0% |
| TXRH Texas Roadhouse Inc. | 0.97% | 644,226 | $124.5M | Add +0.8% |
| FSS Federal Signal Corp. | 0.93% | 926,454 | $119.0M | Reduce -3.3% |
| FN Fabrinet | 0.93% | 210,752 | $118.5M | Add +64.2% |
| POWL Powell Industries Inc. | 0.92% | 410,122 | $117.4M | Reduce -31.8% |
| GMED Globus Medical Inc. Class A | 0.90% | 1,453,206 | $114.8M | Reduce -2.8% |
| COHR Coherent Corp. | 0.88% | 285,545 | $112.6M | Reduce -0.6% |
| GTES Gates Industrial Corp. UK Ltd. | 0.84% | 3,826,871 | $107.0M | Reduce -5.0% |
| HALO Halozyme Therapeutics Inc. | 0.83% | 1,353,883 | $106.0M | Reduce -2.9% |
| PFGC Performance Food Group Co. | 0.81% | 927,410 | $103.7M | Reduce -4.1% |
| BURL Burlington Stores Inc. | 0.80% | 324,761 | $102.9M | Reduce -4.3% |
| AVGO Broadcom Inc. | 0.80% | 272,092 | $102.8M | Reduce -19.2% |
| IDA Idacorp Inc. | 0.79% | 668,455 | $101.1M | Reduce -4.5% |
| MSFT Microsoft Corp. | 0.78% | 269,177 | $100.4M | Reduce -1.3% |
| UMBF Umb Financial Corp. | 0.75% | 672,465 | $96.0M | Reduce -4.1% |
| NBIX Neurocrine Biosciences Inc. | 0.75% | 567,421 | $95.6M | Reduce -4.4% |
| CVCO Cavco Industries Inc. | 0.74% | 153,439 | $94.3M | Reduce -6.0% |
| ESI Element Solutions Inc. | 0.72% | 1,937,614 | $92.5M | Reduce -6.7% |
| MEDP Medpace Holdings Inc. | 0.71% | 172,696 | $91.5M | Reduce -5.5% |
| NDSN Nordson Corp. | 0.69% | 293,653 | $88.6M | Reduce -6.1% |
| LOPE Grand Canyon Education Inc. | 0.69% | 616,654 | $88.3M | Reduce -14.8% |
| VOYA Voya Financial Inc. | 0.68% | 964,138 | $87.3M | Reduce -5.4% |
| AIT Applied Industrial Tech Inc. | 0.68% | 257,886 | $87.2M | Reduce -5.0% |
| SF Stifel Financial Corp. | 0.68% | 1,247,030 | $87.0M | Reduce -4.6% |
| FIX Comfort Systems USA Inc. | 0.68% | 43,819 | $86.9M | Reduce -54.2% |
| JBL Jabil Inc. | 0.66% | 219,538 | $84.6M | Reduce -36.4% |
| JAZZ Jazz Pharmaceuticals PLC | 0.66% | 350,667 | $84.5M | Reduce -5.5% |
| BBIO Bridgebio Pharma Inc. | 0.65% | 1,125,131 | $83.8M | Add +16.9% |
| SEI Solaris Energy Infrastructur | 0.65% | 1,038,119 | $83.5M | Reduce -2.2% |
| VCYT Veracyte Inc. | 0.65% | 1,416,543 | $83.2M | Reduce -1.4% |
| RHP Ryman Hospitality Properties | 0.62% | 615,786 | $79.2M | Add +74.2% |
| CYTK Cytokinetics Inc. | 0.61% | 916,107 | $78.0M | Add +85.2% |
| LGND Ligand Pharmaceuticals | 0.61% | 246,883 | $78.0M | Add +65.1% |
| DELL Dell Technologies -C | 0.60% | 176,499 | $76.2M | Add +15.0% |
| MGY Magnolia Oil & Gas Corp. Class A | 0.58% | 2,917,419 | $74.6M | Reduce -5.3% |
| CGNX Cognex Corp. | 0.58% | 1,020,371 | $73.9M | Reduce -5.7% |
| BJ Bj's Wholesale Club Holdings filed as BJS WHSL CLUB HLDGS INC | 0.57% | 837,052 | $73.0M | Add +12.5% |
| CFG Citizens Financial Group | 0.57% | 1,033,943 | $72.4M | Reduce -1.6% |
| PM Philip Morris International | 0.55% | 391,260 | $70.8M | Reduce -1.6% |
| DCO Ducommun Inc. | 0.55% | 381,545 | $70.7M | Add +22.3% |
| GBCI Glacier Bancorp Inc. | 0.54% | 1,348,072 | $69.5M | Reduce -4.3% |
| ABBV Abbvie Inc. | 0.54% | 275,739 | $69.4M | Reduce -10.9% |
| JPM JPMorgan Chase & Co. | 0.54% | 211,142 | $69.1M | Reduce -1.6% |
| VCEL Vericel Corp. | 0.54% | 1,550,497 | $69.0M | Reduce -4.1% |
| RPM RPM International Inc. | 0.54% | 619,997 | $68.9M | Reduce -4.0% |
| MTDR Matador Resources Co. | 0.54% | 1,377,394 | $68.6M | Reduce -11.6% |
| INSM Insmed Inc. | 0.52% | 629,760 | $67.1M | Add +1.1% |
| NVDA Nvidia Corp. | 0.51% | 329,277 | $65.9M | Reduce -0.7% |
| DORM Dorman Products Inc. | 0.51% | 481,630 | $65.7M | Reduce -6.2% |
| SMTC Semtech Corp. | 0.51% | 405,585 | $65.6M | Reduce -15.1% |
| CRNX Crinetics Pharmaceuticals Inc. | 0.51% | 1,731,140 | $64.8M | Add +7.0% |
| VIAV Viavi Solutions Inc. | 0.50% | 1,350,233 | $64.5M | Reduce -23.8% |
| LEVI Levi Strauss & Co. Class A | 0.50% | 2,582,378 | $64.1M | Reduce -2.9% |
| AIZ Assurant Inc. | 0.50% | 237,825 | $63.9M | Reduce -6.0% |
| NTRA Natera Inc. | 0.49% | 231,308 | $62.8M | Reduce -4.4% |
| KWR Quaker Chemical Corporation | 0.49% | 392,247 | $62.3M | Reduce -0.9% |
| PIPR Piper Sandler Cos | 0.49% | 861,276 | $62.3M | Reduce -6.0% |
| EXP Eagle Materials Inc. | 0.49% | 276,835 | $62.3M | Reduce -5.1% |
| AUB Atlantic Union Bankshares Co. | 0.48% | 1,466,606 | $62.1M | Reduce -6.1% |
| MS Morgan Stanley | 0.47% | 288,780 | $60.4M | Reduce -1.6% |
| WTFC Wintrust Financial Corp. | 0.47% | 373,649 | $60.1M | Reduce -6.4% |
| PNFP Pinnacle Financial Partners | 0.47% | 593,062 | $59.8M | Add +8.7% |
| LECO Lincoln Electric Holdings | 0.46% | 224,077 | $59.5M | Reduce -5.1% |
| IONS Ionis Pharmaceuticals Inc. | 0.46% | 746,966 | $59.2M | Reduce -4.2% |
| SAIL Sailpoint Inc. | 0.46% | 4,017,925 | $58.8M | Add +30.1% |
| CHDN Churchill Downs Inc. | 0.46% | 653,447 | $58.6M | Reduce -2.2% |
| TSM Taiwan Semiconductor-SP ADR | 0.45% | 120,619 | $57.6M | Add +12.4% |
| HQY Healthequity Inc. | 0.45% | 632,382 | $57.1M | Add +36.2% |
| EGP Eastgroup Properties Inc. | 0.43% | 274,429 | $55.6M | Reduce -3.9% |
| CRDO Credo Technology Group Holdi | 0.43% | 203,708 | $55.4M | Reduce -53.0% |
| CFR Cullen/Frost Bankers Inc. | 0.43% | 355,565 | $54.9M | Reduce -5.5% |
| CECO Ceco Environmental Corp. | 0.43% | 601,544 | $54.6M | New |
| GOOGL Alphabet Inc. Class A | 0.43% | 152,624 | $54.5M | Reduce -0.7% |
| ALLE Allegion PLC | 0.42% | 386,022 | $54.2M | Add +20.2% |
| SITE Siteone Landscape Supply Inc. | 0.42% | 471,553 | $54.0M | Reduce -7.0% |
| CSW CSW Industrials Inc. | 0.42% | 191,870 | $53.4M | Add +10.8% |
| LGN Legence Corp. Class A | 0.39% | 590,365 | $50.3M | Reduce -2.1% |
| RARE Ultragenyx Pharmaceutical Inc. | 0.39% | 1,481,178 | $49.5M | Reduce -8.3% |
| BIO Bio-Rad Laboratories-A | 0.38% | 166,905 | $49.0M | Reduce -4.5% |
| TXN Texas Instruments Inc. | 0.38% | 163,567 | $48.8M | Add +4.3% |
| ETR Entergy Corp. | 0.38% | 421,755 | $48.4M | Reduce -25.8% |
| ABCB Ameris Bancorp | 0.38% | 535,106 | $48.3M | Reduce -1.8% |
| SUPN Supernus Pharmaceuticals Inc. | 0.38% | 1,037,242 | $48.2M | Reduce -1.7% |
| AVNT Avient Corp. | 0.38% | 1,299,448 | $48.0M | Reduce -1.4% |
| SBCF Seacoast Banking Corp. | 0.37% | 1,441,055 | $47.9M | Reduce -0.9% |
| SKY Champion Homes Inc. | 0.37% | 542,381 | $47.8M | Reduce -0.8% |
| KNSL Kinsale Capital Group Inc. | 0.37% | 142,599 | $47.0M | Reduce -5.3% |
| HLI Houlihan Lokey Inc. | 0.37% | 349,700 | $46.9M | Reduce -1.2% |
| ITGR Integer Holdings Corp. | 0.36% | 497,676 | $46.5M | Reduce -5.7% |
| ORI Old Republic Intl Corp. | 0.36% | 1,135,463 | $46.5M | Reduce -1.4% |
| ALGM Allegro Microsystems Inc. | 0.36% | 666,812 | $46.4M | Add +1.1% |
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 Q1 2026 → Q2 2026
| FIX Comfort Systems USA Inc. | Reduce -54.2% | 0.68% | −0.48 |
| THR Thermon Group Holdings Inc. | Sold out | 0.00% | −0.42 |
| LOPE Grand Canyon Education Inc. | Reduce -14.8% | 0.69% | −0.40 |
| MTDR Matador Resources Co. | Reduce -11.6% | 0.54% | −0.33 |
| MGY Magnolia Oil & Gas Corp. Class A | Reduce -5.3% | 0.58% | −0.27 |
| PRIM Primoris Services Corp. | Reduce -97.5% | 0.00% | −0.24 |
| GMED Globus Medical Inc. Class A | Reduce -2.8% | 0.90% | −0.24 |
| CNQ Canadian Natural Resources | Reduce -28.2% | 0.25% | −0.23 |
| LIN Linde PLC | Reduce -93.9% | 0.01% | −0.23 |
| RBC RBC Bearings Inc. | Reduce -20.4% | 1.13% | −0.22 |
| TPH Tri Pointe Homes Inc. | Sold out | 0.00% | −0.21 |
| IP International Paper Co. | Reduce -99.5% | 0.00% | −0.20 |
| STE Steris PLC | Reduce -57.3% | 0.11% | −0.19 |
| MASI Masimo Corp. | Sold out | 0.00% | −0.19 |
| BR Broadridge Financial Solutio | Reduce -38.6% | 0.16% | −0.19 |
| ETR Entergy Corp. | Reduce -25.8% | 0.38% | −0.18 |
| SITE Siteone Landscape Supply Inc. | Reduce -7.0% | 0.42% | −0.17 |
| SF Stifel Financial Corp. | Reduce -4.6% | 0.68% | −0.17 |
| BURL Burlington Stores Inc. | Reduce -4.3% | 0.80% | −0.17 |
| BRC Brady Corporation Class A | Sold out | 0.00% | −0.16 |
| ITT Itt Inc. | Reduce -4.1% | 1.18% | −0.16 |
| TNDM Tandem Diabetes Care Inc. | Reduce -4.5% | 0.30% | −0.15 |
| WSR Whitestone REIT | Sold out | 0.00% | −0.15 |
| JBL Jabil Inc. | Reduce -36.4% | 0.66% | −0.15 |
| AVAV Aerovironment Inc. | Reduce -47.3% | 0.10% | −0.14 |
| RTX RTX Corp. | Reduce -19.8% | 0.33% | −0.14 |
| APG Api Group Corp. | Reduce -5.0% | 0.98% | −0.13 |
| PIPR Piper Sandler Cos | Reduce -6.0% | 0.49% | −0.13 |
| IDXX Idexx Laboratories Inc. | Reduce -87.6% | 0.01% | −0.13 |
| PLNT Planet Fitness Inc. Class A | Reduce -6.6% | 0.16% | −0.12 |
| IWM iShares Russell 2000 ETF | Reduce -52.8% | 0.12% | −0.12 |
| AR Antero Resources Corp. | Reduce -5.8% | 0.26% | −0.12 |
| AVGO Broadcom Inc. | Reduce -19.2% | 0.80% | −0.12 |
| FNF Fidelity National Financial | Reduce -96.6% | 0.00% | −0.11 |
| CBZ Cbiz Inc. | Reduce -99.5% | 0.00% | −0.11 |
| MSFT Microsoft Corp. | Reduce -1.3% | 0.78% | −0.11 |
| SUPN Supernus Pharmaceuticals Inc. | Reduce -1.7% | 0.38% | −0.10 |
| OVV Ovintiv Inc. | Reduce -5.8% | 0.28% | −0.10 |
| PATK Patrick Industries Inc. | Reduce -1.4% | 0.24% | −0.10 |
| VNOM Viper Energy Inc. Class A | Reduce -1.6% | 0.36% | −0.10 |
| GPI Group 1 Automotive Inc. | Reduce -5.6% | 0.27% | −0.10 |
| MZTI The Marzetti Company | Reduce -9.5% | 0.18% | −0.09 |
| IDA Idacorp Inc. | Reduce -4.5% | 0.79% | −0.09 |
| SUI Sun Communities Inc. | Reduce -5.4% | 0.35% | −0.09 |
| KNSL Kinsale Capital Group Inc. | Reduce -5.3% | 0.37% | −0.09 |
| HLI Houlihan Lokey Inc. | Reduce -1.2% | 0.37% | −0.08 |
| LCII Lci Industries | Reduce -6.7% | 0.20% | −0.08 |
| VRRM Verra Mobility Corp. | Sold out | 0.00% | −0.08 |
| CHRD Chord Energy Corp. | Reduce -1.2% | 0.18% | −0.08 |
| CHDN Churchill Downs Inc. | Reduce -2.2% | 0.46% | −0.07 |
Portfolio Buys Q1 2026 → Q2 2026
| CECO Ceco Environmental Corp. | New | 0.43% | +0.43 |
| DELL Dell Technologies -C | Add +15.0% | 0.60% | +0.37 |
| LGND Ligand Pharmaceuticals | Add +65.1% | 0.61% | +0.35 |
| STX Seagate Technology Holdings | Add +10006.4% | 0.35% | +0.34 |
| FN Fabrinet | Add +64.2% | 0.93% | +0.34 |
| RHP Ryman Hospitality Properties | Add +74.2% | 0.62% | +0.33 |
| CYTK Cytokinetics Inc. | Add +85.2% | 0.61% | +0.32 |
| WHD Cactus Inc. Class A | New | 0.30% | +0.30 |
| AGX Argan Inc. | New | 0.28% | +0.28 |
| AROC Archrock Inc. | New | 0.27% | +0.27 |
| DRI Darden Restaurants Inc. | Add +139207.9% | 0.26% | +0.26 |
| NOVT Novanta Inc. | Add +4.5% | 1.14% | +0.24 |
| DCO Ducommun Inc. | Add +22.3% | 0.55% | +0.22 |
| APD Air Products & Chemicals Inc. | Add +85236.2% | 0.21% | +0.20 |
| IRM Iron Mountain Inc. | Add +80342.6% | 0.19% | +0.19 |
| MU Micron Technology Inc. | Add +485.9% | 0.19% | +0.18 |
| ALGM Allegro Microsystems Inc. | Add +1.1% | 0.36% | +0.18 |
| SPXC SPX Technologies Inc. | Add +5.7% | 1.37% | +0.18 |
| TVTX Travere Therapeutics Inc. | Add +187.8% | 0.18% | +0.14 |
| SFM Sprouts Farmers Market Inc. | New | 0.14% | +0.14 |
| CROX Crocs Inc. | New | 0.14% | +0.14 |
| AMD Advanced Micro Devices | Add +1762.7% | 0.14% | +0.14 |
| CSL Carlisle Cos Inc. | Add +23560.4% | 0.13% | +0.13 |
| TSM Taiwan Semiconductor-SP ADR | Add +12.4% | 0.45% | +0.13 |
| ALKS Alkermes PLC | New | 0.12% | +0.12 |
| TXN Texas Instruments Inc. | Add +4.3% | 0.38% | +0.11 |
| FWONK Liberty Media Corp. Class C | Add +19606.3% | 0.11% | +0.11 |
| HQY Healthequity Inc. | Add +36.2% | 0.45% | +0.10 |
| SAIL Sailpoint Inc. | Add +30.1% | 0.46% | +0.10 |
| CVLT Commvault Systems Inc. | Add +2.5% | 0.25% | +0.10 |
| TCBI Texas Capital Bancshares Inc. | Add +55.6% | 0.28% | +0.09 |
| UFPT Ufp Technologies Inc. | Add +54.5% | 0.18% | +0.09 |
| AIN Albany Intl Corp. Class A | Add +64.6% | 0.16% | +0.08 |
| ARES Ares Management Corp. Class A | Add +84.1% | 0.19% | +0.08 |
| DSGX The Descartes Systems Grp | Add +70.6% | 0.23% | +0.07 |
| AMCR Amcor PLC | Add +43.1% | 0.24% | +0.07 |
| ETN Eaton Corp. PLC | Add +22.3% | 0.27% | +0.06 |
| ARQT Arcutis Biotherapeutics Inc. | Add +30.3% | 0.26% | +0.06 |
| APH Amphenol Corp. Class A | Add +23.3% | 0.16% | +0.05 |
| GPC Genuine Parts Co. | Add +35.6% | 0.21% | +0.05 |
| PNFP Pinnacle Financial Partners | Add +8.7% | 0.47% | +0.05 |
| HLNE Hamilton Lane Inc. Class A | Add +74.5% | 0.26% | +0.05 |
| PHAT Phathom Pharmaceuticals Inc. | Add +52.5% | 0.18% | +0.04 |
| TXRH Texas Roadhouse Inc. | Add +0.8% | 0.97% | +0.04 |
| FBK FB Financial Corp. | Add +31.9% | 0.20% | +0.04 |
| TDG Transdigm Group Inc. | Add +23.9% | 0.18% | +0.04 |
| SN Sharkninja Inc. | Add +0.3% | 0.16% | +0.04 |
| VVV Valvoline Inc. | Add +15.3% | 0.18% | +0.03 |
| INDB Independent Bank Corp. | Add +16.4% | 0.23% | +0.03 |
| VAC Marriott Vacations World | New | 0.03% | +0.03 |
Notes & Other Activity Q1 2026 → Q2 2026
| FDN First Trust DJ Internet Ind | DJ INTERNT IDX | New | 0 | $0 |
Bonds, preferreds, convertibles and warrants; not part of the stock holdings or percentages above.
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 |