How to Evaluate Sources for Commercial Insurance Agencies Research
A working method for separating regulatory fact, rate data, and vendor marketing when you research commercial lines, brokers, or carrier strategy.
This is for anyone writing about commercial insurance agencies and brokers: analysts, content teams at insurtech vendors, journalists, or agency principals tracking their own market. The goal is a habit, not a one-time checklist: know which sources carry regulatory weight, which carry sales weight, and how to tell the difference fast.
How the beat actually works
Commercial insurance research runs on a few kinds of material, and they don't mix well if you treat them as equivalent.
Regulatory and statistical data comes from the National Association of Insurance Commissioners (NAIC), which aggregates filings every US insurer must submit by state and line of business. The NAIC's Statistical Handbook and Capital Markets Bureau reports are as close to ground truth as this industry gets on premiums, losses, and reserves. State departments of insurance publish their own market conduct exams, rate filings, and licensing actions, which matter if you're writing about a specific agency's standing or a state's regulatory climate.
Brokerage rankings and size data come from trade reporting like Business Insurance's annual largest-brokers list, which Alliant and others republish. These lists are self-reported revenue figures verified by the publication, useful for tracking consolidation and private equity roll-ups among agencies, but they reflect reported revenue, not underwriting performance.
Trade press, Insurance Journal, Business Insurance, Risk & Insurance, Carrier Management, cover deals, leadership moves, and rate trends on a daily or weekly cadence. They're fast and well-sourced for news, but opinion columns and sponsored content run alongside reporting, so check the byline and look for a disclosure line.
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Get your free report →Associations like the Independent Insurance Agents & Brokers of America (Big "I") and the Council of Insurance Agents & Brokers (CIAB) publish market surveys, including CIAB's quarterly Commercial Property/Casualty Market Survey, which tracks rate movement by line. These are genuinely useful but are advocacy bodies for their members, so framing can lean toward the agency channel's interests over carriers' or insureds'.
Vendor and database research (AM Best ratings, Dakota-style company databases, broker tech platforms) is often rigorous but published to drive leads. Treat the data as a starting point and check their methodology section before citing a figure.
How to weigh what you find
- Trace every stat to its filing or survey. If a figure about combined ratios or broker revenue doesn't cite the NAIC, a state DOI filing, or a named survey (CIAB, Big "I"), treat it as an estimate until you find the source.
- Separate self-reported size from audited performance. Brokerage revenue rankings are self-reported to the publication. They're fine for tracking scale and M&A activity, not for claims about profitability or service quality.
- Check who funded the research. Insurtech and MGA-backed "state of the industry" reports often bury a sales pitch in the methodology. Read the fine print on sample size and respondent selection.
- Match the geography to the claim. Commercial insurance is regulated state by state. A national trend piece should either cite NAIC aggregate data or clearly flag that it's describing one or a few states.
- Note the publication date against the rate cycle. Commercial lines move in hard and soft market cycles; a rate or capacity claim from two years ago may no longer hold, especially in property or cyber lines.
- Prefer named analysts and disclosed methodology over "industry sources say." CIAB's survey, AM Best's rating reports, and NAIC publications all show their work. Anonymous trend claims in press releases usually don't.
A standing brief worth filing
A useful weekly brief for this beat tracks: NAIC and state DOI filings relevant to your focus lines, the latest CIAB or Big "I" market survey data, Business Insurance and Insurance Journal coverage of broker M&A and leadership changes, and any new AM Best rating actions on carriers your agencies place business with. A standing research brief can run this cadence automatically so nothing slips between quarterly survey releases.
How to evaluate sources
Primary filing vs. secondary summary
NAIC data, state DOI filings, and AM Best rating reports are primary sources. Trade press summaries and vendor blog posts about them are secondary. Cite the primary source when the claim matters, and use secondary coverage only for context or quotes.
Self-reported vs. audited figures
Brokerage revenue rankings (Business Insurance, Alliant's reprint) are self-reported to the publisher. Good for tracking scale and consolidation trends, not a substitute for audited financials or loss ratio data from regulatory filings.
Disclosed methodology
CIAB's Commercial P/C Market Survey and NAIC statistical reports publish their sample and data sources. If a market trend report doesn't explain how it collected data or from how many respondents, discount its precision.
Funding and incentive
Insurtech platforms, MGAs, and database vendors publish research to generate leads. Useful for spotting trends early, but check if a figure is cherry-picked to support a product pitch before repeating it as neutral fact.
State specificity
Commercial insurance regulation and rate approval happen at the state level. Confirm whether a claim is a national aggregate (NAIC), a specific state DOI action, or a regional trend before generalizing it.
Currency against the market cycle
Commercial lines, especially property, cyber, and liability, move through hard and soft cycles. Check the publication date of any rate or capacity claim against the most recent CIAB survey quarter.
Starting sources
- NAIC Statistical Handbook of Data Available to Insurance Regulators
- NAIC homepage (model laws, publications, newsroom)
- 2024 Insurance Regulation Report Card - R Street Institute
- Business Insurance: Largest Brokers (via Alliant)
- What publications and sites should insurance agents be reading
- The Top Insurance Company Databases: 2026 Guide - Dakota
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