Slack

Slack reported 575 paid organizations above $100,000 ARR in January 2019 and 143% net dollar retention. The first is a snapshot; the second compares recurring revenue of a prior paid cohort, excluding new paid customers. Their definitions are the lesson, not a universal expansion benchmark. [Key Business Metrics](https://www.sec.gov/Archives/edgar/data/1764925/000162828019004786/slacks-1.htm). [Read the case](/en/breakdowns/slack-land-expand).

Slack’s rolling twelve-month paid-revenue cohort definition makes the denominator and included movements explicit. Its reported expansion measure is not a unique-person count or a causal seller effect. New customers do not belong to the retained starting cohort.

Slack’s registration statement describes both self-service adoption and direct selling, alongside Enterprise Grid capabilities for broader organizations. The actual choice combines an easy initial route with support for buying and deployment at a different scope. Central administration, security and organizational coordination can become relevant after a team already uses the product. A seller’s contribution should be stated through the obstacle they resolve: clarify the offer, coordinate authority or support a broader agreement. The analytical alternative is to let the same customer complete that work independently. The filing does not isolate which route caused an account’s expansion or establish that every account requires assistance. Its net dollar retention follows a defined paid-revenue cohort and includes expansion, contraction and attrition; it is not a measure of seller productivity. The manager’s decision is where assistance adds enough customer and business value to justify its cost. Existing team use can inform that decision while still leaving a larger buyer’s requirements unresolved.