Exhibit 22.1

List of Guarantor Subsidiaries

As of July 31, 2023, the following subsidiaries of HEICO Corporation (the "Company") are guarantors of the Company’s 5.25% Senior Notes due 2028 and 5.35% Senior Notes due 2033:

16-1741 PROPERTY, INC.

26 WARD HILL PROPERTY, LLC

3 MCCREA PROPERTY COMPANY, LLC

34 FREEDOM COURT, CORP.

3D PLUS U.S.A., INC.

60 SEQUIN LLC

8929 FULLBRIGHT PROPERTY, LLC

ACCURATE METAL MACHINING, INC.

ACTION RESEARCH CORPORATION

AEROANTENNA TECHNOLOGY, INC.

AERODESIGN, INC.

AEROELT, LLC

AEROSPACE & COMMERCIAL TECHNOLOGIES, LLC

AIRCRAFT TECHNOLOGY, INC.

ANALOG MODULES, INC.

APEX HOLDING CORP.

APEX MICROTECHNOLOGY, INC.

ASTRO PROPERTY, LLC

ASTROSEAL PRODUCTS MFG. CORPORATION

BAY EQUIPMENT CORP.

BLUE AEROSPACE LLC

BREIDON, LLC

CAMTRONICS, LLC

CARBON BY DESIGN CORPORATION

CARBON BY DESIGN LLC

CHARTER ENGINEERING, INC.

CONNECTRONICS CORP.

CONXALL CORPORATION

CSI AEROSPACE, INC.

DB CONTROL CORP.

DECAVO LLC

DIELECTRIC SCIENCES, INC.

DUKANE SEACOM, INC.

ENGINEERING DESIGN TEAM, INC.

FLIGHT MICROWAVE CORPORATION

FUTURE AVIATION, INC.

HARTER AEROSPACE, LLC

HEICO AEROSPACE CORPORATION

HEICO AEROSPACE HOLDINGS CORP.

HEICO AEROSPACE PARTS CORP.

HEICO EAST CORPORATION

HEICO ELECTRONIC TECHNOLOGIES CORP.

HEICO FLIGHT SUPPORT CORP.

HEICO PARTS GROUP, INC.

HEICO REPAIR GROUP AEROSTRUCTURES, LLC

HEICO REPAIR, LLC

HETC I, LLC

HETC II CORP.

HETC III, LLC

HETC IV, LLC

HETC V, LLC

HFSC III CORP.

HFSC IV CORP.

HFSC V, LLC

HFSC VI, LLC

HFSC VII, LLC

HFSC VIII, LLC

HFSC XI CORP.

HNW 2 BUILDING CORP.

HNW BUILDING CORP.

HVT GROUP, INC.

INERTIAL AIRLINE SERVICES, INC.

INTELLIGENT DEVICES, LLC

IRCAMERAS LLC

IRONWOOD ELECTRONICS, INC.

JET AVION CORPORATION

JETSEAL, INC.

LEADER TECH, INC.

LPI INDUSTRIES CORPORATION

LUCIX CORPORATION

LUMINA POWER, INC.

MASTIFF DESIGN, INC.

MCCLAIN INTERNATIONAL, INC.

MIDWEST MICROWAVE SOLUTIONS, INC.

NIACC-AVITECH TECHNOLOGIES INC.

NORTHWINGS ACCESSORIES CORPORATION

OPTICAL DISPLAY ENGINEERING, INC.

OPTICAL DISPLAY ENGINEERING, LLC

PACIWAVE, INC.

PIONEER INDUSTRIES LLC

PRIME AIR, LLC

PYRAMID SEMICONDUCTOR CORP

QUELL CORPORATION

R.H. LABORATORIES, INC.

RADIANT POWER CORP.

RADIANT POWER IDC, LLC

RADIANT-SEACOM REPAIRS CORP.

RAMONA RESEARCH, INC.

REINHOLD HOLDINGS, INC.

REINHOLD INDUSTRIES, INC.

RESEARCH ELECTRONICS INTERNATIONAL, L.L.C.

RIDGE ENGINEERING, LLC

RIDGE HOLDCO, LLC

ROBERTSON FUEL SYSTEMS, LLC

ROCKY MOUNTAIN HYDROSTATICS, LLC

SANTA BARBARA INFRARED, INC.

SEAL DYNAMICS LLC

SEAL Q CORP.

SENSOR SYSTEMS, INC.

SENSOR TECHNOLOGY ENGINEERING, LLC

SIERRA MICROWAVE TECHNOLOGY, LLC

SOLID SEALING TECHNOLOGY, INC.

SPECIALITY SILICONE PRODUCTS, INC.

SUNSHINE AVIONICS LLC

SWITCHCRAFT HOLDCO, INC.

SWITCHCRAFT, INC.

THE BECHDON COMPANY, LLC

THERMAL ENERGY PRODUCTS, INC.

THERMAL STRUCTURES, INC.

TRAD TESTS & RADIATIONS, INC.

TRANSFORMATIONAL SECURITY, LLC

TSID HOLDINGS, LLC

TTT CUBED, INC.

TURBINE KINETICS, INC.