complementor

:  a company that sells a product or service that complements the products or services of another company Microsoft and Intel are complementors. Microsoft's sophisticated software packages require ever more powerful chips from Intel. The chips in turn make the software feasible and economic. — Richard Koch, The 80/20 Principle and 92 Other Powerful Laws of Nature, 2013 Hard negotiations with complementors (companies with complementary products/services and mutual customers) and suppliers can come back to bite you. — Rajshree Agarwal and Raj Echambadi, The Baltimore Sun, 4 Nov. 2011 Often the adoption of new technology and the growth of the market are affected by the degree to which complementary products and services are available from complementors for customers. — Adrian Ryans et al., Winning Market Leadership, 2000