Australia's underwriting agency sector has never been busier — or more contested. About 300 underwriting agencies are writing more than $10 billion in gross written premium amounting to around 20% of the general insurance market. According to the Underwriting Agencies Council (UAC) the segment has expanded 470% since 2014-15 and grew another 12.3% in the last financial year alone. Brokers are leaning in: 60% now place more than 30% of their business through agencies.
That growth has, predictably, attracted capital. The past 18 months have produced ATC's $33.2 million acquisition of Sterling Insurance, 360 Underwriting Solutions' majority stake in Crop Risk Underwriting, United Risk's purchase of facultative reinsurance MGA Pinnacle, Envest's significant stake in NZ-based Ando, and — at the top end — EQT's A$5.25 billion takeover proposal for AUB Group.
For brokers, one big question underneath all of this could be: when I call my underwriter, who actually owns the decision?
The 2025 Brokers on Underwriting Agencies survey makes clear what brokers value in the channel — technical expertise (rated 4.23 out of 5) and the ability to place niche or emerging risks (4.09), with responsiveness the fastest-improving metric over the past 12 months. Those are precisely the attributes that risk being diluted when an agency is rolled into a larger group's pricing engine, referral matrix and shared-service stack.
APRA has been watching the same dynamic from a prudential angle. Executive board member Suzanne Smith has explicitly warned insurers about "the risk associated with outsourced underwriting to agencies," urging stronger governance, conflict management and onboarding discipline. Translated into broker terms: capacity providers are tightening the leash on the agencies they back, which inevitably bleeds into how those agencies make day-to-day decisions on broker submissions.
This is the live tension. Brokers want the agility, specialism and authority of a boutique underwriter. The economics — and the regulators — increasingly push agencies towards scale, shared infrastructure and group-level oversight. Something has to give.
One Australian group, 11th Avenue — the newly created parent company of High Street Underwriting Agency — is betting it can square the circle by deliberately not running the standard consolidation playbook. According to founding group CEO Blair Whittle (pictured), the group operates as a "house of brands, not a homogenised platform," with each underwriting business retaining its own risk appetite, authority and service model. Centralisation, Whittle argues, is restricted to "non-differentiating functions" — technology, compliance, operational infrastructure — rather than the underwriting judgement itself.
That distinction matters because it cuts against the prevailing direction of agency M&A. Whittle was blunt about the alternative: "The last thing we want to do is buy an agency and roll it into something bigger, more corporate, or less approachable." The strategic equity model, pursued through 11th Avenue's stakes in established agencies including High Street , is positioned as the opposite of a roll-up — minority or strategic holdings designed to leave the underwriting culture, broker relationships and decision-making authority intact at the brand level.
The tech piece is where the model is most visible. ColumnZero — the group's new standalone technology business, built from High Street's in-house IT team — now sits alongside the underwriting agency under 11th Avenue, the newly formed parent. The point is that the development team can serve multiple agencies across the group rather than being treated as an offshoot of any single one.
"ColumnZero isn't just there to support High Street," Whittle said. "It's now positioned to assist other insurance businesses within the 11th Avenue group and, over time, to support additional agencies that partner with us." For brokers, the point is that platform-level efficiency is being built underneath the agencies, not on top of them.
Whether the "house of brands" thesis holds will be tested in the small mechanics of placement — the things brokers feel weekly. Three signals are worth watching.
The first is referral patterns. If an agency that used to bind locally suddenly refers more decisions up the chain after an acquisition, independence is eroding regardless of the marketing language. The second is wording flexibility. Agencies that have lost true underwriting authority tend to default to standardised forms; bespoke endorsements become harder to negotiate. The third is claims responsiveness. Centralised claims teams can be faster on paper and slower in practice when a case needs sector-specific judgement.
None of which means consolidation is bad for brokers. Scale brings investment in technology, compliance maturity that satisfies CPS 230 and the Financial Accountability Regime, and more durable capacity relationships. But it does mean that the agency name above the door may no longer be a reliable proxy for who is making the call on the other end of the phone.
For brokers, the practical takeaway is to ask the question that few currently do at renewal time: What changed for this agency under its new ownership and who now signs off on the risks I send? In a market where 20% of GWP flows through underwriting agencies, the answer matters.
