Sigma remade their image as a lens manufacturer by creating high quality, sharp DSLR lenses that undercut the prices of equivalent first party offerings. They have expanded into the mirrorless space with similar success, and now, the company has confirmed it will be focusing the majority of its attention on mirrorless developments in the future.
The news came in a tweet from Sigma's CEO, Kazuto Yamaki, in which he stated that the company will focus their attention on developing DG DN and DC DN mirrorless lenses (full frame and APS-C), with the most emphasis being put on full frame mirrorless lenses. Personally, Sigma's transition seems to be going just fine so far. For example, their 105mm f/1.4 DG HSM Art lens has been nothing but spectacular for me, both in performance and image quality, and the rest of their mirrorless offerings have received generally good reviews. The news that the company is focusing its attention exclusively on mirrorless offerings is not particularly surprising given the general state of the industry and the direction in which it is headed, but given that DSLRs are still quite prominent, it might be a bit disappointing for a lot of shooters to hear. Of course, this does not necessarily mean the company is no longer producing lenses for DSLRs, only that they will not be developing new lenses. Production will certainly depend on demand.