Retention and expansion for Series A companies: the 90-day install for cybersecurity
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. Written for CISOs, VPs of security, and heads of GRC.
This edition is written for CISOs, VPs of security, and heads of GRC. In cybersecurity, security buyers reward domain fluency and reject anything that reads as vendor spam, so the way you install retention and expansion has to reflect that reality from day one.
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.
The binding constraint we see in cybersecurity is almost always credibility and trust, not tooling. Retention and expansion is only useful in this vertical when it is pointed at that constraint — not at a generic growth number borrowed from another category.
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.
Concretely for cybersecurity: the difference between a real security opportunity and a wasted quarter is one credible sentence. That is the reason it is worth installing retention and expansion properly rather than half-heartedly across three vendors.
Frequently asked questions
Retention · cybersec — answered
- Does retention and expansion work for cybersecurity?
- Yes — provided it is aimed at credibility and trust, not tooling rather than a generic growth number. The difference between a real security opportunity and a wasted quarter is one credible sentence.
- 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.
- What is the cybersec specific pitfall with retention and expansion?
- Running the generic playbook without adapting to security buyers reward domain fluency and reject anything that reads as vendor spam. The install has to be vertical-first.
Growth Broker editorial
Filed under retention · cybersec