Seiko Group (セイコー・グループ, Seikō Gurūpu) was a Japanese corporate group consisting of three core companies Seiko Holdings Corp. (Seiko; f/k/a K. Hattori & Co., Hattori Seiko), Seiko Instruments Inc. (SII; f/k/a Daini Seikosha, Seiko Instruments & Electronics) and Seiko Epson Corp (Epson; f/k/a Suwa Seikosha). The three companies were linked by a common thread of timepiece technology. In the present day, the Seiko Group is recognized as a corporate group composed of Seiko Group Corporation and its subsidiaries and affiliates. Although Epson still develops and manufactures wristwatches for the Seiko Group, Epson and its subsidiaries are not considered part of the group.