Loss ratio most often means claims divided by premiums in insurance — but venture investors also use the phrase for how much of a portfolio goes to zero.

How it works

Insurance: Loss ratio = incurred losses / earned premiums. Combined with expense ratio yields combined ratio — below 100% suggests underwriting profit before investment income. Insurtech startups report loss ratio by cohort and geography.

Venture: Informally, if a fund makes 30 investments and 15 return 0x, half the deals “lost” capital — but winners may still drive fund return via power law.

Why it matters

• Founders: Insurtech pitches need credible loss ratio paths and reinsurance strategy. Do not confuse GAAP accounting with underwriting loss ratio.
• Investors: Insurance: worsening loss ratio without pricing fixes is fatal. VC: expect high deal-level loss counts if a few outliers return the fund.

Insurtech startups should segment loss ratio by product line and underwriting year — blended ratios hide deteriorating new business. Reinsurance treaties cap tail risk but add cost and complexity.

In VC portfolio reviews, “loss ratio” language is informal — use MOIC distribution and write-off counts for precision.

Common mistake

Using the same term across insurance and VC conversations without clarifying which definition you mean.

Practical takeaway

Define which “loss ratio” you mean in every conversation — insurance underwriting versus venture write-off rates. Precision prevents mismatched expectations between founders and investors in insurtech or fund discussions.

Related ideas

• Combined ratio and insurtech metrics
• Power law and fund concentration
• Underwriting cycle