Slack Technologies may have more than 10 million daily users, but it wants potential investors to focus on a tiny sliver of its customers: the 575 businesses that pay more than $100,000 a year for their employees to use its workplace-messaging product.

The San Francisco-based company, in its US Securities and Exchange Commission filing Friday (Saturday AEST) for an unusual direct listing, emphasised that it has been pushing further into the realm of big enterprise customers. Slack's premise is that once a company starts using its services, its workers will enjoy using the platform so much that the employer will have to buy more over time.

Bloomberg