| QS Industries, Inc. ( Beaverton, OR ) | QSound Labs, Inc. ( Calgary, CA ) | QST Holdings, LLC. ( Palo Alto, CA ) |
| QS Pro, LLC ( Plymouth, MI ) | Qsound Labs, Inc.( Calgary Providence Alberta ) | QST HOLDINGS, LLC. ( San Jose, CA ) |
| QSC Audio Products, Inc. ( Costa Mesa, CA ) | QSound Ltd. ( Calgary, CA ) | QST Industries, Inc. ( Chicago, IL ) |
| QSC Audio Products, LLC ( Costa Mesa, CA ) | QSpeed Semiconductor Inc. ( Santa Clara, CA ) | QSTHoldings, LLC ( Palo Alto, CA ) |
| QSC Audio, Inc. ( Costa Mesa, CA ) | Qspeed Semiconductor, Inc. ( Santa Clara, CA ) | QT TECHNOLOGIES, LLC |
| Qsecure, Inc. ( Los Altos, CA ) | QSPEX TECHNOLOGIES, INC. ( Alpharetta, GA ) | QT, Inc. ( Elk Grove Village, IL ) |
| QSEL-Quantum Solar Energy Linz Forschungs-Und Entwick-Lungs-Gesellsch | Qspex, LLC ( Alpharetta, GA ) | Qtac Solutions Ltd.( Bristol ) |
| QServ Limited | QSR AUTOMATIONS, INC. | Qtac Solutions Ltd. ( Bristol, GB ) |
| QSF Acquisitions Inc. ( Portland, OR ) | QSSolutions, Inc. ( Royal Oak, MI ) | Qtask |
| QSI Corporation ( Salt Lake City, UT ) | QST Holding, LLC ( Palo Alto, CA ) | QTC Management, Inc. ( Diamond Bar, CA ) |
| QSI International, Inc. ( Allison Park, PA ) | QST HOLDINGS, INC. ( Palo Alto, CA ) | Qtera Corporation ( Boca Raton, FL ) |
| Qsida Corporation( Taoyuan ) | QST Holdings, Inc. ( San Jose, CA ) | QTL Biosystems LLC ( Santa Fe, NM ) |
| Qsida Corporation ( Taoyuan, TW ) | QST Holdings, L.L.C. ( Brentwood, TN ) | QTL Biosystems, LLC ( Santa Fe, NM ) |
| QSigma, Inc. ( San Jose, CA ) | QST Holdings, LLC ( Fremont, CA ) | QTM LLC ( Weston, CT ) |
| QSigma, Inc. ( Sunnyvale, CA ) | QST Holdings, LLC ( Palo Alto, CA ) | QTS S.r.l.( Brugherio ) |
| Qsonix | QST Holdings, LLC ( Palto Alto, CA ) | QTS S.r.l.( Brugherio Milan ) |
| QSound Labs, Inc.( Calgary ) | QST HOLDINGS, LLC ( San Jose, CA ) | |
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