CIK: 0001082917
Total reported value
$11.3B
Reporting period: 2026-03-31 · Number of holdings: 1197
GW&K Investment Management, LLC disclosed 1197 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $11.3B and a quarterly turnover rate of 26.8%.
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GW&K Investment Management, LLC's disclosed holdings carry a Herfindahl concentration index of 0.006 — mathematically equivalent to about 176 equally-sized positions, well below its 1197 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes vary widely across the portfolio (a coefficient of variation of 2.19), with a handful of outsized bets alongside many smaller positions.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Add AEIS
-11.8% $51.3M
Trim BFAM
-99.8% -$52.1M
Add FSS
+69.7% $42.3M
Trim MSFT
-9.4% -$44.6M
Trim TTAN
-99.9% -$37.8M
Trim WSO
-96.7% -$35.8M
Showing top 200 holdings (of 1197 total)
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | AEIS | Advanced Energy Industries | Stock-Industrials | 1.71% | +0.48% | -11.80% | |
| 2 | MTSI | Macom Technology Solutions H | Stock-Tech | 1.64% | -0.16% | -31.11% | |
| 3 | RBC | RBC Bearings INC | Stock-Industrials | 1.35% | — | -22.63% | |
| 4 | ITT | Itt INC | Stock-Industrials | 1.34% | — | -7.43% | |
| 5 | SPXC | Spx Technologies INC | Stock-Industrials | 1.19% | +0.28% | +28.78% | |
| 6 | FIX | Comfort Systems USA INC | Stock-Industrials | 1.16% | +0.26% | -14.31% | |
| 7 | GMED | Globus Medical INC - A | Stock-Healthcare | 1.14% | — | -1.43% | |
| 8 | APG | Api Group CORP | Stock-Industrials | 1.11% | — | -1.95% | |
| 9 | STRL | Sterling Infrastructure INC | Stock-Industrials | 1.09% | +0.26% | -2.28% | |
| 10 | LOPE | Grand Canyon Education INC | Stock-Consumer Staples | 1.08% | — | -1.74% | |
| 11 | BURL | Burlington Stores INC | Stock-Consumer Disc | 0.97% | — | -0.46% | |
| 12 | POWL | Powell Industries INC | Stock-Industrials | 0.96% | +0.26% | -21.21% | |
| 13 | TXRH | Texas Roadhouse INC | Stock-Consumer Disc | 0.93% | — | -2.12% | |
| 14 | AVGO | Broadcom INC | Stock-Tech | 0.92% | -0.26% | -14.86% | |
| 15 | FSS | Federal Signal CORP | Stock-Industrials | 0.91% | +0.38% | +69.68% | |
| 16 | INSM | Insmed INC | Stock-Healthcare | 0.90% | — | +29.08% | |
| 17 | NOVT | Novanta INC | Stock-Other | 0.89% | — | +16.51% | |
| 18 | MSFT | Microsoft CORP | Stock-Tech | 0.89% | -0.37% | -9.39% | |
| 19 | IDA | Idacorp INC | Stock-Utilities | 0.88% | — | -2.40% | |
| 20 | MTDR | Matador Resources Co | Stock-Energy | 0.87% | +0.29% | -0.82% | |
| 21 | MGY | Magnolia Oil & Gas CORP - A | Stock-Energy | 0.86% | +0.26% | -2.78% | |
| 22 | SF | Stifel Financial CORP | Stock-Financials | 0.85% | — | +45.73% | |
| 23 | MOG-A | Moog Inc-class A | Stock-Other | 0.85% | — | -2.29% | |
| 24 | JBL | Jabil INC | Stock-Tech | 0.81% | — | -6.14% | |
| 25 | GTES | Gates Industrial Corporation plc | Stock-Industrials | 0.80% | — | -11.16% | |
| 26 | HALO | Halozyme Therapeutics INC | Stock-Healthcare | 0.79% | — | +11.10% | |
| 27 | MEDP | Medpace Holdings INC | Stock-Healthcare | 0.77% | — | +17.01% | |
| 28 | ENTG | Entegris INC | Stock-Tech | 0.76% | +0.22% | -1.18% | |
| 29 | NDSN | Nordson CORP | Stock-Industrials | 0.73% | — | -10.74% | |
| 30 | PFGC | Performance Food Group Co | Stock-Consumer Staples | 0.73% | — | -0.71% | |
| 31 | UMBF | Umb Financial CORP | Stock-Financials | 0.70% | — | -2.38% | |
| 32 | CVCO | Cavco Industries INC | Stock-Consumer Disc | 0.70% | — | +8.03% | |
| 33 | NBIX | Neurocrine Biosciences INC | Stock-Healthcare | 0.69% | — | +2.96% | |
| 34 | BJ | Bj's Wholesale Club Holdings | Stock-Consumer Staples | 0.65% | — | -2.52% | |
| 35 | AIT | Applied Industrial Tech INC | Stock-Industrials | 0.64% | — | +25.39% | |
| 36 | BBIO | Bridgebio Pharma INC | Stock-Healthcare | 0.63% | +0.22% | +53.75% | |
| 37 | ESI | Element Solutions INC | Stock-Materials | 0.62% | — | -13.19% | |
| 38 | JAZZ | Jazz Pharmaceuticals plc | Stock-Healthcare | 0.62% | — | -13.22% | |
| 39 | PIPR | Piper Sandler Cos | Stock-Financials | 0.62% | +0.62% | NEW | |
| 40 | VOYA | Voya Financial INC | Stock-Financials | 0.61% | — | +10.26% | |
| 41 | COHR | Coherent CORP | Stock-Tech | 0.60% | +0.60% | NEW | |
| 42 | SITE | Siteone Landscape Supply INC | Stock-Industrials | 0.59% | — | -0.73% | |
| 43 | ABBV | Abbvie INC | Stock-Healthcare | 0.59% | — | -17.47% | |
| 44 | FN | Fabrinet | Stock-Tech | 0.59% | +0.59% | NEW | |
| 45 | PM | Philip Morris International | Stock-Consumer Staples | 0.58% | — | -1.49% | |
| 46 | RPM | Rpm International INC | Stock-Materials | 0.57% | — | +14.83% | |
| 47 | ETR | Entergy CORP | Stock-Utilities | 0.56% | — | -1.60% | |
| 48 | JPM | Jpmorgan Chase & Co | Stock-Financials | 0.56% | — | -1.38% | |
| 49 | CFG | Citizens Financial Group | Stock-Financials | 0.56% | — | -1.54% | |
| 50 | GBCI | Glacier Bancorp INC | Stock-Financials | 0.55% | — | +5.75% |
Performance for Q3 2026
+3.7%
Performance Last 4 Quarters
+25.7%
Based on 77% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 1197 | $11.3B | 27 | |
| 2025-12-31 | 1178 | $11.6B | 20 | |
| 2025-09-30 | 1179 | $11.3B | 37 | |
| 2025-06-30 | 1167 | $11.2B | 0 | |
| 2025-03-31 | 1189 | $10.8B | 100 | |
| 2024-12-31 | 1154 | $11.8B | 0 | |
| 2024-09-30 | 1139 | $11.7B | 0 | |
| 2024-06-30 | 1128 | $10.9B | 0 | |
| 2024-03-31 | 1105 | $11.3B | 0 | |
| 2023-12-31 | 1120 | $10.7B | 0 | |
| 2023-09-30 | 1102 | $10.0B | 0 | |
| 2023-06-30 | 1090 | $10.5B | 0 | |
| 2023-03-31 | 715 | $10.3B | 0 | |
| 2022-12-31 | 658 | $9.9B | 0 | |
| 2022-09-30 | 563 | $9.1B | 0 | |
| 2022-06-30 | 929 | $9.3B | 0 | |
| 2022-03-31 | 997 | $11.2B | 0 | |
| 2021-12-31 | 563 | $12.0B | 0 | |
| 2021-09-30 | 541 | $11.2B | 0 | |
| 2021-06-30 | 581 | $11.5B | 100 | |
| 2021-03-31 | 552 | $10.9B | 26 | |
| 2020-12-31 | 538 | $9.5B | 34 | |
| 2020-09-30 | 545 | $7.6B | 22 | |
| 2020-06-30 | 518 | $7.1B | 30 | |
| 2020-03-31 | 521 | $5.7B | 44 | |
| 2019-12-31 | 520 | $7.5B | 15 | |
| 2019-09-30 | 514 | $7.1B | 21 | |
| 2019-06-30 | 337 | $6.6B | 19 | |
| 2019-03-31 | 303 | $6.2B | 31 | |
| 2018-12-31 | 283 | $5.1B | 33 | |
| 2018-09-30 | 286 | $6.2B | 19 | |
| 2018-06-30 | 288 | $6.1B | 16 | |
| 2018-03-31 | 292 | $5.9B | 21 | |
| 2017-12-31 | 269 | $5.9B | 20 | |
| 2017-09-30 | 261 | $6.0B | 18 | |
| 2017-06-30 | 246 | $5.8B | 19 | |
| 2017-03-31 | 229 | $5.3B | 16 | |
| 2016-12-31 | 232 | $5.1B | 21 | |
| 2016-09-30 | 220 | $5.3B | 23 | |
| 2016-06-30 | 222 | $4.8B | 20 | |
| 2016-03-31 | 218 | $4.5B | 21 | |
| 2015-12-31 | 227 | $4.3B | 20 | |
| 2015-09-30 | 223 | $4.2B | 19 | |
| 2015-06-30 | 224 | $4.4B | 17 | |
| 2015-03-31 | 222 | $4.4B | 21 | |
| 2014-12-31 | 219 | $4.2B | 22 | |
| 2014-09-30 | 224 | $3.8B | 18 | |
| 2014-06-30 | 226 | $3.9B | 22 | |
| 2014-03-31 | 222 | $3.7B | 19 | |
| 2013-12-31 | 220 | $3.7B | 21 | |
| 2013-09-30 | 221 | $3.3B | 27 | |
| 2013-06-30 | 220 | $2.7B | — |
GW&K Investment Management, LLC's most significant position changes for 2026-03-31: Sold out: Piper Sandler Cos (62C); New buy: Piper Sandler Cos (PIPR); New buy: Coherent CORP (COHR); New buy: Fabrinet (FN); New buy: Pinnacle Financial Partners (PNFP).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | AEIS | Advanced Energy Industries | +0.5% | -11.80% | Trim |
| 2 | FSS | Federal Signal CORP | +0.4% | +69.68% | Add |
| 3 | MTDR | Matador Resources Co | +0.3% | -0.82% | Trim |
| 4 | SPXC | Spx Technologies INC | +0.3% | +28.78% | Add |
| 5 | TXN | Texas Instruments INC | +0.3% | +17760.59% | Add |
| 6 | WMB | Williams Cos INC | +0.3% | +47635.10% | Add |
| 7 | STRL | Sterling Infrastructure INC | +0.3% | -2.28% | Trim |
| 8 | MGY | Magnolia Oil & Gas CORP - A | +0.3% | -2.78% | Trim |
| 9 | FIX | Comfort Systems USA INC | +0.3% | -14.31% | Trim |
| 10 | POWL | Powell Industries INC | +0.3% | -21.21% | Trim |
| 11 | MCHP | Microchip Technology INC | +0.2% | +28566.78% | Add |
| 12 | DELL | Dell Technologies -c | +0.2% | +25479.50% | Add |
| 13 | ENTG | Entegris INC | +0.2% | -1.18% | Trim |
| 14 | BBIO | Bridgebio Pharma INC | +0.2% | +53.75% | Add |
| 15 | ETN | Eaton Corporation plc | +0.2% | +9647.39% | Add |
| 16 | MTSI | Macom Technology Solutions H | -0.2% | -31.11% | Trim |
| 17 | CSCO | Cisco Systems INC | -0.2% | -44.65% | Trim |
| 18 | INTA | Intapp INC | -0.2% | -4.49% | Trim |
| 19 | DSGX | Descartes Systems Grp/the | -0.2% | -41.68% | Trim |
| 20 | SLGN | Silgan Holdings INC | -0.2% | -88.71% | Trim |
| 21 | ADC | Agree Realty CORP | -0.2% | -38.66% | Trim |
| 22 | FTAI | FTAI Aviation Ltd. | -0.2% | -49.44% | Trim |
| 23 | SAIL | Sailpoint INC | -0.2% | -4.04% | Trim |
| 24 | AVAV | Aerovironment INC | -0.2% | -30.62% | Trim |
| 25 | COLB | Columbia Banking System INC | -0.2% | -91.01% | Trim |
| 26 | AMT | American Tower CORP | -0.2% | -96.21% | Trim |
| 27 | UNH | Unitedhealth Group INC | -0.2% | -93.68% | Trim |
| 28 | CBZ | Cbiz INC | -0.2% | -38.61% | Trim |
| 29 | AVGO | Broadcom INC | -0.3% | -14.86% | Trim |
| 30 | LITE | Lumentum Holdings INC | -0.3% | -99.92% | Trim |
| 31 | MRK | Merck & Co. INC. | -0.3% | -96.39% | Trim |
| 32 | THRM | Gentherm INC | -0.3% | -99.84% | Trim |
| 33 | AZTA | Azenta INC | -0.3% | -37.21% | Trim |
| 34 | T86 | Tri Pointe Homes INC | -0.3% | -72.85% | Trim |
| 35 | WSO | Watsco INC | -0.3% | -96.68% | Trim |
| 36 | TTAN | Servicetitan Inc-a | -0.3% | -99.92% | Trim |
| 37 | MSFT | Microsoft CORP | -0.4% | -9.39% | Trim |
| 38 | BFAM | Bright Horizons Family Solut | -0.5% | -99.85% | Trim |
| 39 | 62C | Piper Sandler Cos | — | EXIT | Sold out |
| 40 | PIPR | Piper Sandler Cos | — | NEW | New buy |
| 41 | COHR | Coherent CORP | — | NEW | New buy |
| 42 | FN | Fabrinet | — | NEW | New buy |
| 43 | PNFP | Pinnacle Financial Partners | — | NEW | New buy |
| 44 | PNW | Pinnacle Financial Partners, Inc. | — | EXIT | Sold out |
| 45 | CW | Curtiss-wright CORP | — | NEW | New buy |
| 46 | TSM | Taiwan Semiconductor-sp Adr | — | NEW | New buy |
| 47 | PLNT | Planet Fitness INC - Cl A | — | NEW | New buy |
| 48 | LCII | Lci Industries | — | NEW | New buy |
| 49 | AMCR | Amcor plc | — | NEW | New buy |
| 50 | BBSI | Barrett Business Svcs INC | — | EXIT | Sold out |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-05-13 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-02-11 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-11-12 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-08-11 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-05-05 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-02-05 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-11-07 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-08-12 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-05-08 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-02-09 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-11-09 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-08-09 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-05-09 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-02-10 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-11-09 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-08-09 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-05-09 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-05-09 | Amendment | View on EDGAR |
| 2021-12-31 | 2022-02-11 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-11-10 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-08-10 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-11 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-02-05 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-10 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-08-06 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-05-11 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-02-10 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-11-05 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-08-06 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-05-14 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-07 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-11-06 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-08-07 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-05-08 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-01-19 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-10-11 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-07-11 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-04-10 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-01-17 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-10-18 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-07-26 | Amendment | View on EDGAR |
| 2016-06-30 | 2016-07-11 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-04-19 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-01-15 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-10-08 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-07-08 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-04-08 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-01-08 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-10-09 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-07-09 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-04-11 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-01-13 | 13F-HR | View on EDGAR |
| 2013-09-30 | 2013-10-08 | 13F-HR | View on EDGAR |
| 2013-06-30 | 2013-08-13 | 13F-HR | View on EDGAR |
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