SAP Ariba is an American software and information technology services company located in Palo Alto, California. It was acquired by German software maker SAP SE for $4.3 billion in 2012. 

Coupa Software is a global technology platform for Business Spend Management. The company is headquartered in San Mateo, California with offices throughout Europe, Latin America, and Asia Pacific.

Basware Corporation is a Finnish software company selling enterprise software for financial processes, purchase to pay and financial management; main competitors in this arena include Tradeshift, Coupa, Ariba, Tungsten Network and iPayables.

Tradeshift is a cloud based business network and platform for supply chain payments, marketplaces, and apps. Its 2018 round of funding, led by Goldman Sachs, raised US$250 million at a valuation of $1.1 billion, giving the company unicorn status. 

SMART by GEP is a unified procurement software platform with comprehensive functionality, including spend analysis, sourcing, contract management, supplier management, and procure-to-pay. 

Zycus is a global provider of complete Source-to-Pay suite of procurement performance solutions. It designs and develops software in the procurement domain. Zycus is headquartered at Princeton, New Jersey, and has 11 global offices across the US, Europe, Middle East, Asia, and Australia.