Retention and expansion for Series A companies: the 90-day install
The exact 90-day plan for standing up retention and expansion at Series A — the point where the founder can no longer be every function.
Series A is the moment retention and expansion stops being optional. The founder has to step out of some of the work, the plan requires a defensible growth number, and every quarter compounds toward the next raise.
Day 1 to 30: diagnosis and instrumentation. Name the constraint, write the ICP, wire gross and net revenue retention into the board pack.
Day 31 to 60: first live cycle at 20% of planned volume. Founder still in every review. Kill criteria written and enforced.
Day 61 to 90: ramp to full volume, hire the first dedicated operator, and hand off ops. Founder retains strategy and the weekly review.
By day 90 the metric is legible and the trajectory is defensible. This is what turns a Series A story into a Series B round.
Trap most Series A companies fall into: treating CS as a support cost centre. It usually shows up around day 45 when the founder tries to hire ahead of the model.
The Series A version of retention and expansion looks small compared to what you will build at Series B. That is the point — it is a foundation, not a monument.
Frequently asked questions
Retention — answered
- Should we start retention and expansion before Series A?
- Yes if the founder has time; the Series A version is the same model at higher spend.
- How much of the round should fund retention and expansion?
- Meaningful — often 20–30% of the growth line — but only after diagnosis.
- When do we hire the first retention and expansion operator?
- Around day 60, once the model has run one full cycle with the founder.
- What Series A trap should we avoid?
- Treating CS as a support cost centre — usually a premature senior hire.
Growth Broker editorial
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