If you ask any institutional buyer what they look at first in agency diligence, the answer almost always reduces to: show me the carrier mix. Before producer compensation, before retention, before operational documentation — the carrier mix tells the buyer what kind of agency this is, what the structural risks are, and where the multiple is going to land.
Carrier appointments are the economic moat.
An independent agency's economic moat — the structural advantage that competitors can't easily replicate — is its carrier portfolio. Each appointment unlocks a market the agency can sell into. Each binding-authority arrangement reduces the carrier's friction on placement. Each contingency contract converts profitable underwriting into bonus income. Without appointments, the agency is a marketing function; with the right portfolio, it's a distribution franchise.
Buyers value market access on three dimensions: scope (how many appointments, across what lines), depth (volume per carrier, contingency tier, binding authority), and terms (commission rate, override structures, MGA relationships). A book with five appointments at standard rates is structurally different from one with three appointments at tier-1 contingency status.
Size-specific prescriptions, not universal advice.
The Depth vs. Breadth framework gives size-specific guidance — neither strategy is universally right.
Fewer carriers, higher per-carrier volume.
- Best fit: small agencies ($1–3M revenue).
- Concentrates volume to unlock tier-1 contingency thresholds.
- Trade-off: concentration risk if any single carrier exits or restructures.
- Buyer reads: stable franchise with defended carrier relationships.
Many carriers, diversified mix.
- Best fit: large agencies ($5M+ revenue) and aggregator-style books.
- Spreads risk across many appointments, reduces single-carrier exposure.
- Trade-off: less contingency leverage; thinner per-carrier relationships.
- Buyer reads: scaled, optionality-rich book; favored by platform acquirers.
The mistake is applying the wrong framework: a $1.5M agency with 12 carriers struggles to hit any tier-1 thresholds and underperforms a comparable agency with 5 deep relationships. A $7M agency with 4 carriers leaves contingency optimization on the table and faces single-carrier exit risk.
The thresholds buyers actually underwrite.
Beyond the depth/breadth framing, buyers apply explicit concentration tests. The most common:
| Top-carrier concentration | Buyer treatment | Typical multiple impact |
|---|---|---|
| < 25% of premium with any single carrier | Healthy diversification | No concentration discount |
| 25–40% with top carrier | Moderate concentration — explainable | 0 to −0.25× multiple |
| 40–60% with top carrier | Elevated concentration — diligence focus | −0.25× to −0.75× multiple |
| > 60% with top carrier | Single-carrier dependency — deal risk | −0.75× to −1.5× multiple; possible walkaway |
The mitigation for concentrated books isn't always diversification — sometimes the concentration is the result of specialization (carrier-fit niche book) that the buyer can be helped to understand as deliberate. The seller's job is to explain it before the buyer reads it as a defect: documented carrier strategy, multi-year relationship history, contingency-tier evidence. A concentrated book with a defended story sometimes clears at the lower-discount end of the range above; a concentrated book without a story almost always clears at the upper-discount end.
Get the carrier story defensive-ready.
For sellers preparing to list, the carrier-mix work has three components, sequenced over the runway:
- Document the strategy. Whether the book is concentrated or diversified, write down why. Buyers credit a defended posture; they discount a posture that looks accidental.
- Audit transferability. Each material appointment should be reviewed for change-of-control language. Some carriers reserve consent rights; some require continuation conditions; some are transferable cleanly. Knowing which carriers will require what before the buyer's diligence team asks is the structural advantage.
- Reposition where viable. If concentration sits in a band that compresses the multiple by 0.5–1.0× and the seller has 18+ months of runway, deliberate new-business intake through under-weighted carriers can move the mix into a healthier band. The math is real — every half-turn of multiple recovered is material at scale.
A concentrated book with a defended story clears at the lower-discount end of the range. A concentrated book without a story clears at the upper end. The story is the difference.
The companion Explainer — Commission & Contract Economics — covers the financial mechanics that flow from these structural choices. Together they anchor the carrier dimension of the critical factors of agency value.