| PROTO LABS INC. | PROTO LABS INC | 60.75 |
| PROTO LABS INC | PROTO LABS INC | 60.75 |
| TECOMET | Charlesbank Capital Partners | 55.48 |
| HITCHINER COUNTERGRAVITY CAST OPERATIONS (VCO/DCO/MCT) | HITCHINER MANUFACTURING CO INC | 48.23 |
| ISOMEDIX OPERATIONS INC. | STERIS | 6.91 |
| BOYD CORP INC. | Goldman Sachs | 6.81 |
| PACE INDUSTRIES - CAMBRIDGE DIV | Pace Industries | 4.88 |
| PARADIGM PRECISION HOLDINGS LLC | Pursuit Aerospace | 4.68 |
| PARKER HANNIFIN CORP CHOMERICS DIV | Parker-Hannifin | 3.22 |
| CHROMA COLOR CORP | Arsenal Capital Partners | 2.82 |
| AVIENT COLORANTS USA LLC - HOLDEN FACILITY | Avient Corporation | 2.81 |
| INNER-TITE CORP. | INNER-TITE CORP. | 1.59 |
| LUBRIZOL ADVANCED MATERIALS INC | Berkshire Hathaway | 1.48 |
| ADVANCE COATINGS CO | ADVANCE COATINGS CO | 1.14 |
| KOMTEK FORGE LLC | Crawford United | 1.12 |
| CHEMGENES CORP | CHEMGENES CORP | 1.12 |
| AMPHENOL APC INC | Amphenol | 0.83 |
| WORTHEN INDUSTRIES INC UPACO DIV | Worthen Industries | 0.69 |
| METSO AUTOMATION USA INC | Valmet Oyj | 0.64 |
| COORSTEK IGNITER PRODUCTS | COORSTEK INC | 0.47 |
| MEXICHEM SPECIALTY COMPOUNDS | Orbia Advance Corporation | 0.33 |
| WYMAN-GORDON CO | Berkshire Hathaway | 0.23 |
| ENTEGRIS INC | Entegris | 0.17 |
| NYACOL NANOTECHNOLOGIES INC | NYACOL NANOTECHNOLOGIES INC | 0.16 |
| S&E SPECIALTY POLYMERS LLC | Nautic Partners | 0.12 |
| HOLCIM - NER INC. | Holcim Group | 0.11 |
| OMNOVA SOLUTIONS | Synthomer | 0.09 |
| VERANOVA L.P. | Altaris Capital Partners | 0.07 |
| COLT REFINING INC | COLT REFINING INC | 0.07 |
| BENCHMARK ELECTRONICS NH DIV | Benchmark Electronics | 0.07 |
| NEWARK AMERICA | Greif Inc. | 0.06 |
| ALLCOAT TECHNOLOGY INC | ALLCOAT TECHNOLOGY INC | 0.04 |
| AVCARB MATERIAL SOLUTIONS | Arsenal Capital Partners | 0.04 |
| ANALOG DEVICES INC/WILMINGTON MANUFACTURING | Analog Devices Inc. | 0.03 |
| HARCROS CHEMICALS INC | Harcros Chemicals | 0.03 |
| SPECIALTY MATERIALS INC. | Global Materials | 0.03 |
| MAJILITE MANUFACTURING INC | MERIDIAN INDUSTRIES INC | 0.03 |
| WYMAN-GORDON CO | Berkshire Hathaway | 0.02 |
| COVESTRO LLC | Covestro | 0.01 |
| INTERVALA LLC | Intervala | 0.01 |
| DUNCAN GALVANIZING CORP. | DUNCAN GALVANIZING CORP. | 0.01 |
| IDEAL TAPE CO | American Biltrite | 0.01 |
| EMD MILLIPORE CORP | Merck KGaA (EMD) | 0.01 |
| HOLLINGSWORTH & VOSE CO WEST GROTON | HOLLINGSWORTH & VOSE CO | 0.01 |
| CIRCUIT CONNECT INC | Infinitum | 0.01 |
| BRADFORD INDUSTRIES | Wembly Enterprises | 0.01 |
| BRONZE CRAFT CORP | BRONZE CRAFT CORP | 0.01 |
| AMERICAN SUPERCONDUCTOR | American Superconductor Corp. | 0.00 |
| SAINT-GOBAIN ABRASIVES & SAINT -GOBAIN CERAMICS & PLASTICS | Saint-Gobain | 0.00 |
| SEAMAN PAPER CO. OF MASSACHUSETTS INC. | SEAMAN PAPER CO. OF MASSACHUSETTS INC. | 0.00 |
| HOLCIM - NER INC. | Holcim Group | 0.00 |
| EDWARDS VACUUM LLC | Atlas Copco | 0.00 |
| STRAUMANN MANUFACTURING INC | STRAUMANN MANUFACTURING INC | 0.00 |
| INTERNATIONAL RECTIFIER HIREL PRODUCTS INC. | Infineon Technologies | 0.00 |
| UNIVAR SOLUTIONS USA INC. - TEWKSBURY MA | Apollo Global Management | 0.00 |
| WORTHEN INDUSTRIES | Worthen Industries | 0.00 |
| PANDOLF PERKINS CO | EH PERKINS CONSTRUCTION INC | 0.00 |
| BOSTIK MANUFACTURING PLANT | Arkema | 0.00 |
| MORGAN ADVANCED CERAMICS INC | Morgan Advanced Materials | 0.00 |
| BROX INDUSTRIES INC | Brox Industries | 0.00 |
| BAE SYSTEMS INFORMATION & ELECTRONIC SYSTEMS INTEGRATION | BAE Systems | 0.00 |
| MARMON UTILITY LLC | Berkshire Hathaway | 0.00 |
| BENEVENTO SAND & STONE CORP | BENEVENTO SAND & STONE CORP | 0.00 |
| ICP CONSTRUCTION | CPC HOLDING LLC | 0.00 |
| TORROMEO INDUSTRIES INC. | TORROMEO INDUSTRIES INC | 0.00 |
| HAARTZ CORP | HAARTZ CORP | 0.00 |
| VICOR CORP | Vicor Corp. | 0.00 |
| ROHM & HAAS ELECTRONIC MATERIALS LLC | DuPont de Nemours | 0.00 |
| JG MACLELLAN CONCRETE CO INC | JG MACLELLAN CONCRETE CO INC | 0.00 |
| LGC STANDARDS VHG LABS | LGC STANDARDS VHG LABS | 0.00 |
| TEKNOR APEX ELASTOMERS INC. | TEKNOR APEX | 0.00 |
| GRANITE STATE CONCRETE CO INC WESTFORD | JG MACLELLAN CONCRETE CO INC | 0.00 |
| HIGHLINE WARREN LLC | Pritzker Group | 0.00 |
| L3 TECHNOLOGIES INC. | L3Harris Technologies | 0.00 |
| CIRTRONICS CORP | CIRTRONICS CORP | 0.00 |
| SAEILO ENTERPRISES | SAEILO ENTERPRISES INC | 0.00 |
| HOLDEN TRAP ROCK | MA BROKEN STONE CO | 0.00 |
| JG MACLELLAN CONCRETE CO INC | JG MACLELLAN CONCRETE CO INC | 0.00 |
| INTERVALA LLC | Intervala | 0.00 |
| RAYTHEON CO | RTX Corporation | 0.00 |
| DAV-TECH PLATING INC. | DAV-TECH PLATING INC. | 0.00 |
| FIREYE INC | Carrier Global Corporation | 0.00 |
| US PACK INC | US PACK INC | 0.00 |
| JG MACLELLAN CONCRETE CO INC | JG MACLELLAN CONCRETE CO INC | 0.00 |
| KOCH SEPARATION SOLUTIONS INC. | Koch Industries | 0.00 |
| HOLCIM - NER INC. | Holcim Group | 0.00 |
| PARKER HANNIFIN CORP CHOMERICS DIV | Parker-Hannifin | 0.00 |
| RYMES - HUDSON | SUPERIOR PLUS CORP | 0.00 |
| DAUPHINAIS CONCRETE INC. | DAUPHINAIS CONCRETE INC | 0.00 |
| SUPERCON INC | SUPERCON INC | 0.00 |
| HOLOGIC INC | Hologic | 0.00 |
| VERANOVA L.P. | Altaris Capital Partners | 0.00 |
| BIOSYNTH INTERNATIONAL INC. | KKR & Co. | 0.00 |
| INDUSTRIAL POLYMERS & CHEMICAL S INC | INDUSTRIAL POLYMERS & CHEMICAL S INC | 0.00 |
| PLATING FOR ELECTRONICS INC. | PLATING FOR ELECTRONICS INC. | 0.00 |
| THERMO FISHER SCIENTIFIC | Thermo Fisher Scientific | 0.00 |
| HOUGHTON CHEMICAL CORP | HOUGHTON CHEMICAL CORP | 0.00 |
| SANMINA CORP. | Sanmina | 0.00 |
| SCULLY SIGNAL | SCULLY SIGNAL | 0.00 |
| SHAWSHEEN RUBBER CO INC | SHAWSHEEN RUBBER CO INC | 0.00 |
| TELEDYNE FLIR SURVEILLANCE | Teledyne Technologies | 0.00 |
| THERMO FISHER SCIENTIFIC | Thermo Fisher Scientific | 0.00 |
| CABOT CORP | Cabot Corp. | 0.00 |
| THUNDERLINE-Z | One Rock Capital Partners | 0.00 |
| SAINT GOBAIN PERFORMANCE PLASTICS | Saint-Gobain | 0.00 |
| MURPHYS WASTE OIL SERVICES INC | Clean Harbors Inc. | 0.00 |
| NYLON CORP OF AMERICA | WEMBLY NYCOA HOLDINGS LLC | 0.00 |
| BROX INDUSTRIES INC | Brox Industries | 0.00 |
| AOTCO METAL FINISHING LLC | AOTCO METAL FINISHING LLC | 0.00 |
| GVS N.A. | GVS Group | 0.00 |
| SAFETY-KLEEN SYSTEMS MARLBOROUGH (MRB) | Clean Harbors Inc. | 0.00 |
| RESILIENCE BOSTON INC. | NATIONAL RESILIENCE INC | 0.00 |
| JAYBIRD & MAIS INC | JAYBIRD & MAIS INC | 0.00 |
| NEW METHOD PLATING CO.,INC. | NEW METHOD PLATING CO.,INC. | 0.00 |
| ANIKA THERAPEUTICS | Anika Therapeutics | 0.00 |
| NEW HAMPSHIRE BALL BEARINGS INC | MinebeaMitsumi | 0.00 |
| CYTIVA | Danaher | 0.00 |
| SARTORIUS STEDIM 450 DLB | SARTORIUS STEDIM BIOTECH | 0.00 |
| SKYWORKS SOLUTIONS INC | Skyworks Solutions | 0.00 |
| CURIA MASSACHUSETTS INC. | Aledade | 0.00 |
| MACOM TECHNOLOGY SOLUTIONS INC | M/A-COM TECHNOLOGY SOLUTIONS HOLDINGS | 0.00 |
| CL HAUTHAWAY & SONS CORP | CL HAUTHAWAY & SONS CORP | 0.00 |
