GW&K Investment Management, LLC — 13F Holdings & Portfolio
CIK 1082917 · latest 13F-HR filed 2026-08-12
GW&K Investment Management, LLC manages $12.8M in 13F-reported U.S. long-equity assets across 1,287 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are MTSI (1.75%), AEIS (1.58%), SPXC (1.27%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 121 new positions, exited 32, added to 558, and trimmed 243.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
BOSTON, MA 02116
$12.8M
Long-equity book
1,287
Distinct positions
2026-06-30
Filed 2026-08-12
+121 / −32 / ↑558 / ↓243
vs 2026-03-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- MACOM TECHNOLOGY SOLUTIONS H$55.1K +29.6%
- FABRINET$51.5K +77.0%
- DELL TECHNOLOGIES -C$51.0K +202.3%
- LIGAND PHARMACEUTICALS$48.2K +161.5%
- RYMAN HOSPITALITY PROPERTIES$46.5K +142.6%
Top Trims
- COMFORT SYSTEMS USA INC-$45.1K -34.2%
- GRAND CANYON EDUCATION INC-$34.8K -28.3%
- INSMED INC-$34.7K -34.1%
- MATADOR RESOURCES CO-$29.9K -30.4%
- PRIMORIS SERVICES CORP-$27.0K -98.3%
New Positions
- CECO ENVIRONMENTAL CORP$54.6K
- CACTUS INC - A$38.5K
- ARGAN INC$35.8K
- ARCHROCK INC$34.4K
- SPROUTS FARMERS MARKET INC$18.2K
Exited Positions
- THERMON GROUP HOLDINGS INC$48.0K
- TRI POINTE HOMES INC$23.9K
- MASIMO CORP$21.8K
- BRADY CORPORATION - CL A$17.9K
- WHITESTONE REIT$16.7K
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | MACOM TECHNOLOGY SOLUTIONS H | MTSI | 55405Y100 | $223.6K | 1.75% | 587,948 | SH |
| 2 | ADVANCED ENERGY INDUSTRIES | AEIS | 007973100 | $201.7K | 1.58% | 541,066 | SH |
| 3 | SPX TECHNOLOGIES INC | SPXC | 78473E103 | $162.6K | 1.27% | 663,167 | SH |
| 4 | STERLING INFRASTRUCTURE INC | STRL | 859241101 | $154.8K | 1.21% | 184,432 | SH |
| 5 | ITT INC | ITT | 45073V108 | $140.4K | 1.10% | 710,072 | SH |
| 6 | NOVANTA INC | NOVT | 67000B104 | $136.1K | 1.06% | 839,091 | SH |
| 7 | RBC BEARINGS INC | RBC | 75524B104 | $133.6K | 1.04% | 207,393 | SH |
| 8 | MOOG INC-CLASS A | MOG.A | 615394202 | $123.6K | 0.97% | 291,657 | SH |
| 9 | ENTEGRIS INC | ENTG | 29362U104 | $116.8K | 0.91% | 649,599 | SH |
| 10 | API GROUP CORP | APG | 00187Y100 | $116.2K | 0.91% | 2,744,289 | SH |
| 11 | TEXAS ROADHOUSE INC | TXRH | 882681109 | $114.8K | 0.90% | 594,086 | SH |
| 12 | FABRINET | FN | G3323L100 | $113.2K | 0.88% | 201,313 | SH |
| 13 | FEDERAL SIGNAL CORP | FSS | 313855108 | $110.8K | 0.87% | 862,199 | SH |
| 14 | POWELL INDUSTRIES INC | POWL | 739128106 | $109.5K | 0.86% | 382,538 | SH |
| 15 | GLOBUS MEDICAL INC - A | GMED | 379577208 | $107.2K | 0.84% | 1,356,729 | SH |
| 16 | COHERENT CORP | COHR | 19247G107 | $105.6K | 0.83% | 267,756 | SH |
| 17 | BROADCOM INC | AVGO | 11135F101 | $102.8K | 0.80% | 272,092 | SH |
| 18 | MICROSOFT CORP | MSFT | 594918104 | $100.4K | 0.78% | 269,177 | SH |
| 19 | HALOZYME THERAPEUTICS INC | HALO | 40637H109 | $99.2K | 0.78% | 1,267,823 | SH |
| 20 | GATES INDUSTRIAL CORP PLC | GTES | G39108108 | $98.8K | 0.77% | 3,532,896 | SH |
| 21 | PERFORMANCE FOOD GROUP CO | PFGC | 71377A103 | $97.6K | 0.76% | 873,353 | SH |
| 22 | BURLINGTON STORES INC | BURL | 122017106 | $96.0K | 0.75% | 303,167 | SH |
| 23 | IDACORP INC | IDA | 451107106 | $92.9K | 0.73% | 613,875 | SH |
| 24 | NEUROCRINE BIOSCIENCES INC | NBIX | 64125C109 | $88.9K | 0.69% | 527,491 | SH |
| 25 | UMB FINANCIAL CORP | UMBF | 902788108 | $88.4K | 0.69% | 619,450 | SH |
| 26 | MEDPACE HOLDINGS INC | MEDP | 58506Q109 | $85.8K | 0.67% | 161,978 | SH |
| 27 | CAVCO INDUSTRIES INC | CVCO | 149568107 | $85.7K | 0.67% | 139,466 | SH |
| 28 | ELEMENT SOLUTIONS INC | ESI | 28618M106 | $84.1K | 0.66% | 1,760,960 | SH |
| 29 | GRAND CANYON EDUCATION INC | LOPE | 38526M106 | $83.1K | 0.65% | 580,473 | SH |
| 30 | NORDSON CORP | NDSN | 655663102 | $82.0K | 0.64% | 271,658 | SH |
| 31 | APPLIED INDUSTRIAL TECH INC | AIT | 03820C105 | $81.5K | 0.64% | 241,103 | SH |
| 32 | SOLARIS ENERGY INFRASTRUCTUR | SEI | 83418M103 | $80.1K | 0.63% | 994,954 | SH |
| 33 | STIFEL FINANCIAL CORP | SF | 860630102 | $80.0K | 0.63% | 1,147,122 | SH |
| 34 | VOYA FINANCIAL INC | VOYA | 929089100 | $79.6K | 0.62% | 878,936 | SH |
| 35 | VERACYTE INC | VCYT | 92337F107 | $79.3K | 0.62% | 1,349,759 | SH |
| 36 | BRIDGEBIO PHARMA INC | BBIO | 10806X102 | $78.9K | 0.62% | 1,058,960 | SH |
| 37 | JABIL INC | JBL | 466313103 | $78.7K | 0.61% | 204,110 | SH |
| 38 | COMFORT SYSTEMS USA INC | FIX | 199908104 | $77.3K | 0.60% | 38,984 | SH |
| 39 | JAZZ PHARMACEUTICALS PLC | JAZZ | G50871105 | $76.7K | 0.60% | 318,498 | SH |
| 40 | DELL TECHNOLOGIES -C | DELL | 24703L202 | $76.2K | 0.60% | 176,499 | SH |
| 41 | LIGAND PHARMACEUTICALS | LGND | 53220K504 | $74.9K | 0.59% | 236,998 | SH |
| 42 | RYMAN HOSPITALITY PROPERTIES | RHP | 78377T107 | $73.4K | 0.57% | 571,116 | SH |
| 43 | CYTOKINETICS INC | CYTK | 23282W605 | $73.3K | 0.57% | 860,627 | SH |
| 44 | CITIZENS FINANCIAL GROUP | CFG | 174610105 | $72.4K | 0.57% | 1,033,943 | SH |
| 45 | PHILIP MORRIS INTERNATIONAL | PM | 718172109 | $70.8K | 0.55% | 391,260 | SH |
| 46 | ABBVIE INC | ABBV | 00287Y109 | $69.4K | 0.54% | 275,739 | SH |
| 47 | JPMORGAN CHASE & CO | JPM | 46625H100 | $69.1K | 0.54% | 211,142 | SH |
| 48 | MAGNOLIA OIL & GAS CORP - A | MGY | 559663109 | $68.7K | 0.54% | 2,687,502 | SH |
| 49 | COGNEX CORP | CGNX | 192422103 | $68.2K | 0.53% | 942,321 | SH |
| 50 | BJS WHOLESALE CLUB HOLDINGS | BJ | 05550J101 | $67.3K | 0.53% | 771,755 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-12 | $12.8M | 1,287 | 0001082917-26-000003 |
| 2026-03-31 | 2026-05-13 | $11.3M | 1,197 | 0001082917-26-000002 |
| 2025-12-31 | 2026-02-11 | $11.6M | 1,178 | 0001082917-26-000001 |
| 2025-09-30 | 2025-11-12 | $11.3M | 1,179 | 0001082917-25-000007 |