The corporate is expected to co-lead a round that would value the GV and Comcast-backed workplace communication platform at $5bn post-money.

Telecommunications firm SoftBank and venture capital firm Accel are set to co-lead a funding round for US-based messaging platform Slack that is expected to reach $500m, Axios reported yesterday.

A Recode report last month stated Slack was raising $500m at a $5bn post-money valuation and named corporates Amazon, Microsoft, Alphabet and Salesforce as prospective investors. SoftBank and Accel were identified by multiple sources, Axios said.

Slack has developed a searchable freemium enterprise messaging app that facilitates conversations, collaboration and…