| Z/I Imaging Corporation | 5 | | UNITED STATES |
| Z+F UK Limited | 3 | www.zf-uk.com | UNITED KINGDOM |
| Zabbix SIA | 1 | www.zabbix.com/ | LATVIA |
| ZabKat | 2 | www.zabkat.com/ | UNITED KINGDOM |
| ZapGrab | 1 | www.zapgrab.net | SPAIN |
| Zattoo Inc. | 1 | zattoo.com | UNITED STATES |
| Zaval Creative Engineering Group | 1 | www.zaval.org | UNKNOWN |
| ZC Software | 1 | www.zc-software.com/index.htm | CHINA |
| ZD Soft | 1 | www.zdsoft.com | UNITED STATES |
| ZDNet | 98 | www.zdnet.com | UNITED STATES |
| Zeallsoft Inc. | 1 | www.zeallsoft.com | UNKNOWN |
| Zeataline Projects Limited | 2 | www.pipedata.com | UNITED KINGDOM |
| Zebra Computer Solutions Ltd | 1 | zebracomputer.co.uk/default.aspx | UNITED KINGDOM |
| Zebra Technologies Corporation | 10 | www.zebra.com | UNITED STATES |
| Zedtek Inc. | 1 | www.ztree.com/html/ztreewin.htm | UNITED STATES |
| Zemana Doo. | 1 | https://www.zemana.com | BOSNIA AND HERZEGOVINA |
| Zend Technologies Ltd. | 3 | www.zend.com | UNITED STATES |
| Zenographics | 1 | www.zeno.com | UNITED STATES |
| ZEON Corporation | 1 | | TAIWAN, PROVINCE OF CHINA |
| Zephyr Corporation | 1 | www.zephyrcorp.com/index.htm | UNITED KINGDOM |
| Zephyr Enginerring Inc. | 2 | sdrstick.com/SDR_stick_prods.html | UNITED STATES |
| Zero Assumption Software | 2 | | RUSSIAN FEDERATION |
| Zero G Software Inc. | 9 | www.installanywhere.com | UNITED STATES |
| Zero2000 Software | 2 | www.zero2000.com | UNITED STATES |
| ZeroTier Inc. | 1 | https://www.zerotier.com/ | ICELAND |
| Zerto | 2 | https://www.zerto.com | UNITED STATES |
| Zeta Centauri | 1 | zetacentauri.com/ | UNITED STATES |
| Zeta Software GmbH | 1 | www.zeta-sw.com/index.html | GERMANY |
| ZETES TECHNOLOGIES | 1 | www.zetes.be | BELGIUM |
| ZF Electronics GmbH | 1 | www.cherrycorp.com/english/c1offc1e.htm | GERMANY |
| Zhorn Software | 1 | www.zhornsoftware.co.uk/contact.html | CANADA |
| Ziff-Davis Interactive (see ZDNet) | 7 | | UNITED STATES |
| Ziften Technologies | 1 | ziften.com/ | UNITED STATES |
| ZillaTube | 1 | | UNKNOWN |
| Zinio Systems Inc. | 2 | www.zinio.com/main | UNITED STATES |
| Zipeg Labs International | 1 | www.zipeg.com/ | UNKNOWN |
| ZipGenius | 1 | www.zipgenius.com/ | ITALY |
| Zipher Ltd. | 1 | www.zipher.co.uk/ | UNITED KINGDOM |
| ZipLabel.Com | 1 | www.ziplabel.com | UNITED STATES |
| Zix Corporation | 1 | https://www.zixcorp.com/ | UNITED STATES |
| ZJMedia Digital Technology Ltd. | 1 | www.winavi.com/ | UNKNOWN |
| ZJMedie Digital Technology Ltd. | 1 | www.winavi.com | CHINA |
| ZJU S-Zone | 1 | www.usbcleaner.cn | CHINA |
| ZM Financial Systems | 1 | https://www.zmfs.com | UNITED STATES |
| ZOHO Corporation | 16 | www.zoho.com | UNITED STATES |
| Zondervan Publishing House | 1 | www.zondervan.com/ | UNITED STATES |
| Zone Labs Inc. | 3 | www.zonelabs.com | UNITED STATES |
| ZoneFiveSoftware | 1 | www.zonefivesoftware.com/sporttracks/ | UNITED STATES |
| ZONER Inc | 1 | https://www.zoner.com | UNITED STATES |
| Zontec | 1 | www.zontec-spc.com/ | UNITED STATES |
| Zoom Corporation | 1 | https://www.zoom.co.jp/ | JAPAN |
| Zoom Video Communications Inc. | 2 | https://zoom.us | UNITED STATES |
| Zoople | 1 | https://zoople.tech/ | AUSTRALIA |
| Zoosk Inc. | 1 | www.zoosk.com | UNKNOWN |
| Zortam | 1 | www.zortam.com/ | SEYCHELLES |
| Zotero | 2 | www.zotero.org/ | UNITED STATES |
| Zpay Payroll Systems Inc. | 1 | www.zpay.com/ | UNITED STATES |
| ZPhoto | 1 | 0xcc.net/zphoto/ | JAPAN |
| ZqWare | 1 | | UNKNOWN |
| Zscaler Inc. | 1 | https://www.zscaler.com | UNITED STATES |
| ZScreen | 1 | code.google.com/p/zscreen/ | UNKNOWN |
| Zultys Inc. | 3 | www.zultys.com/index.php | UNITED STATES |
| Zünd Systemtechnik AG | 1 | https://www.zund.com | SWITZERLAND |
| Zurf Inc. | 1 | | UNITED STATES |
| Zwift | 1 | www.zwift.com | UNITED STATES |
| zxt2007.com | 1 | en.zxt2007.com/ | UNKNOWN |
| ZY Computing Inc. | 1 | www.dvdsanta.com | UNITED STATES |
| Zynga Inc. | 1 | www.zynga.com | UNITED STATES |
