| Y. Hirata/T. Teranishi | 2 | | UNKNOWN |
| Yadu Digital Inc. | 1 | www.yadudigital.com/ | UNKNOWN |
| Yahoo! Inc. | 20 | www.yahoo.com | UNITED STATES |
| Yamaha Corp. | 10 | www.yamaha.com | JAPAN |
| Yamicsoft | 1 | www.sdisw.com/ | UNKNOWN |
| Yammer Inc. | 2 | www.yammer.com/ | UNITED STATES |
| Yandex | 1 | www.yandex.ru/ | RUSSIAN FEDERATION |
| Yannick 'Bluehair' Leon | 1 | modsonline.com/Downloads-full-1962.html | UNKNOWN |
| Yaosoft Inc. | 1 | www.yaosoft.com | UNKNOWN |
| Yaskawa America Inc. | 1 | www.yaskawa.com | UNITED STATES |
| Yellow Computing Computersysteme GmbH | 1 | www.yellow.de/e_default.stm | GERMANY |
| YesSoftware | 1 | www.yessoftware.com/company/contact_us.php | UNITED STATES |
| Yiannis Kakavas | 1 | download.cnet.com/Creepy/3000-12941_4-75445808.html?tag=main;dropDownForm | UNKNOWN |
| Yojna Inc. | 1 | www.yojna.com/general/contactus.asp | UNITED STATES |
| Yokogawa Electric Corporation | 3 | www.yokogawa.com/ | JAPAN |
| Yosemite Technologies Inc. | 1 | www.yosemitetech.com/index.htm | UNITED STATES |
| YouNeedABudget.com | 1 | https://www.youneedabudget.com | UNITED STATES |
| Youngzsoft | 2 | | UNKNOWN |
| yourfiledownloader.com | 1 | www.yourfiledownloader.com/ | PANAMA |
| YourWare Solutions | 1 | www.yourwaresolutions.com/ | UNITED STATES |
| YouSendIt | 1 | www.yousendit.com/ | UNITED STATES |
| YoutubeDownloaderHD.com | 1 | www.youtubedownloaderhd.com/ | RUSSIAN FEDERATION |
| YoYo Games Ltd | 1 | www.yoyogames.com/ | UNITED KINGDOM |
| YSI Inc. | 2 | www.sontek.com/index.php | UNITED STATES |
| YSI Incorporated | 1 | www.ysi.com/ | UNITED STATES |
| Yubico AB | 1 | https://www.yubico.com/ | SWEDEN |
| Yuna Software | 3 | toolbar.msgpluslive.net/ | CANADA |
| Yuri Software | 2 | www.yurisw.com | UNITED STATES |
| yWorks GmbH | 1 | https://www.yworks.com/ | GERMANY |
