Ira H. Bryant IV wrote:

In Japan, it is very common for a company to hold another company's stock. That's especially true when one company is a supplier to another company. It seems likely to me that this is true of Hoya and Tokina, though I don't know where a person could go to check on it.

1) We all know that Pentax has been integrated into Hoya. Pentax Imaging is actually a division of Hoya Corporation.
See: http://www.hoya.co.jp/english/company/company_02_03.html

2) It is also quite evident that Tokina, Kenko and Slik are the same company.
See: http://www.kenko-tokina.co.jp/

Then, it seems that there is a close close relationship between Tokina and Hoya, which should remain different companies tough. That does not prevent Tokina to be owned by Hoya. Heck, they even sell the same product with the same name! See "Pro1 D" line of filters, available as Kenko (brand used in Japan) and as Hoya (brand used worldwide).

Also, quoting from photography on the net (http://photography-on-the.net/forum/showthread.php?t=346581):

"THK Photo Products, Inc. is the U.S. distributor for Tokina Co., Ltd. (Tokyo), one of the top manufacturers of converter lenses for the 35mm single-lens reflex camera, for all products of the camera accessory manufacturer, Kenko Co., Ltd. (Tokyo), camera filters of the worldly prestigious brand of HOYA Corporation (Tokyo). and the most copied line of tripods today.SLIK Corporation (Tokyo).

"Having Tokina Optical Corporation as its core, a successful merge with Kenko Optics of America took place in June of 1993. As a consequence to the merge, the company has been renamed to its present name of T (Tokina), H (Hoya), K (Kenko) Photo Products, Inc.

"As we continue to commit to our current distribution of camera products, we also strive to expand in the area of industrial equipment and mass media optical products, further providing extensive services as the leading optical products manufacturer in the world."

Some more hints:

http://photography-on-the.net/forum/showthread.php?t=417883

http://www.thkphoto.com/

At the end, I don't know who owns who, to which extent, etc, but all above companies must be related.

Dario

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