Tamron's current owner is Sony Corporation... who now holds a controlling interest in the company.
Sadly since Sony now has Tamron by the ***** via their financial interest in Tamron... thus by becoming its largest share holder Sony is able to mandate i.e.
dictates what Tamron can and can't bring to market.
Case in point... Tamron hasn't brought their optically superb lenses from F / EF mount to E mount for the compelling reason that Sony doesn't want Tamron's highly capable lenses to siphon off sales from Sony's GM line.
Just look at
Sigma which is a
family-owned business founded in 1961 by Michihiro Yamaki. All their lenses are excellent performers and definitely outperform Sony (especially at the same price-point). Sony doesn't own nor dictate what Sigma can and can't make.
What is it called when a company buys out (or obtains controlling interest) in its competitors?
An Acquisition i.e. Horizontal Consolidation Examples? Microsoft; Google; Amazon; Facebook; and previously Kodak...
Another major Japanese manufacturer of Photographic Optics is Tokina... A company founded by former Nikon engineers as an OEM manufacturer and originally made lenses for other companies, such as Ponder and Best (later Vivitar).
In May of 1971 the company changed its name to Tokina Optical Co. Ltd. The company was later acquired by Kenko. Kenko also purchased optical glass manufacturer Hoya, whose glass was being used by Tokina Optical. The combined company is now known as Kenko Tokina Co., Ltd.
As a much larger entity they have been immune to Sony's mercenary acquisitions... And their offerings are highly competitive in today's marketplace.
Does knowing (and understanding) a companies' pedigree really matter? That remains to be seen... However if you are a working commercial photographer? Yes, in this scenario
Service and
Support can be and often is a major variable in one's ultimate purchase strategies.
Hope this helps, or is at least food for thought.
Wishing all much joy and financial success on your photographic career endeavors