The metrics investors actually check

ARR growth is a headline. It is not a verdict. When institutional capital underwrites a growth-stage company, the partner walking into the IC meeting is checking a specific set of numbers. Top-line growth rate is rarely the one that decides the check.

Here is what they look at.

How the curve is shaped

1. Net Revenue Retention

NRR answers the only question that compounds: does the existing customer base grow on its own? A company at 115% NRR is, by definition, a growing company before it acquires anyone new. Anything below 100% means new logos are filling a leaking bucket. The bucket gets harder to fill every quarter.

2. Cohort durability

Headline retention numbers hide more than they show. Underwriters reconstruct retention by acquisition cohort and look for one thing: are newer cohorts performing as well or better at the same age? A flat or improving curve across vintages is the difference between growth that compounds and growth that depreciates.

How efficient the engine is

3. Magic Number

Net new ARR divided by the prior period's sales and marketing spend. A magic number above 1 means each dollar of S&M produced more than a dollar of new annualized revenue. Below 0.5 and the question stops being whether to invest and becomes why the company is spending at this level at all.

4. CAC Payback

The number of months of gross profit it takes to recover the cost of acquiring a customer. The shorter the payback, the less working capital the company consumes to grow. Sub-18-month payback is the rough institutional bar at growth stage; sub-12 is strong.

5. Burn Multiple

Net burn divided by net new ARR. It is the single cleanest measure of capital efficiency because it doesn't care how growth was generated. Only what it cost. A multiple under 1.5x is healthy at growth stage. Above 3x and the round becomes structurally hard to underwrite, regardless of growth rate.

Whether the business gets stronger as it scales

6. Gross margin trend

Absolute gross margin matters less than its direction. A SaaS business climbing from 68% to 76% over eight quarters is telling a very different story than one drifting from 76% to 68%, even if the trailing-twelve-month margin is identical. Underwriters read the slope, not the snapshot.

7. Rule of 40

Growth rate plus operating margin. The Rule of 40 is the shorthand that lets a partner compare a 60%-growing, –20%-margin business against a 25%-growing, +15%-margin business on the same axis. It is imperfect, it is universal, and most growth-stage IC memos have a line for it.

What this means for the founder

Most founders walk into a fundraise knowing one or two of these numbers well, a few roughly, and the rest not at all. The asymmetry is not malicious. It is simply that the diligence rubric usually lives on the other side of the table.

Levian puts it on yours.