Bamboo Insurance has launched a new partnership with MS Transverse Insurance Company that adds approximately $150 million in admitted homeowners and dwelling fire capacity in California, targeting constrained regions including Los Angeles, San Diego and San Francisco where limited admitted market appetite has pushed many homeowners and landlords toward surplus lines coverage. The new capacity is available statewide for new business and renewals with effective dates beginning July 17, 2026, distributed through Bamboo's existing agent and partner network.
The announcement is part of a specific market inflection. Insurance Commissioner Ricardo Lara's Sustainable Insurance Strategy - Proposition 103 reforms finalized December 2024 allowing admitted insurers to use forward-looking catastrophe models and reinsurance costs in rate filings in exchange for expanding coverage in wildfire-distressed areas - has begun producing measurable admitted market re-entry. The California FAIR Plan, the state's insurer of last resort, had grown to cover more than 450,000 properties following non-renewals from carriers including State Farm after 2024, a stress compounded by the January 2026 Los Angeles wildfires. The California Department of Insurance reported that FAIR Plan residential policy growth slowed to roughly 2.4% in Q1 2026, down sharply from 35,000 to 50,000 policies added per quarter through 2024 and 2025 - the most specific available evidence that admitted market capacity is beginning to displace last-resort coverage. The Bamboo-MS Transverse partnership is one expression of that shift.
Top 10 insurers including Farmers, Mercury and CSAA have committed to growing their California homeowners' books since the reforms took effect, with Mercury alone pledging more than 38,000 new policies over time. MS Transverse itself carries an A+ financial strength rating from AM Best, upgraded from A in June 2025 to align with the rating of its Mitsui Sumitomo Insurance parent, and finished 2024 as the largest hybrid fronting insurer in the US by gross written premium.
The new options introduce higher deductible tiers up to $10,000, mandatory water damage sublimits with flexible structures and a claim-free discount that increases incrementally with sustained claim-free tenure. John Chu, CEO of Bamboo Insurance, said the partnership enables more competitive pricing combined with the underwriting discipline needed for long-term sustainability, with expanded carrier relationships and more precise underwriting tools central to how Bamboo approaches affordability and capacity in challenging markets.
Bamboo's Greenshoots Re sidecar now backs four fronting carriers with roughly $175 million in collateralized capacity following its latest expansion - a structure that fits within a broader national pattern of capital-light platforms using third-party capital to fund growth in hard-to-place markets. Guy Carpenter identified MGAs, MGUs and capital-light platforms as one of three main sidecar growth areas heading into 2026. EY reported that P&C sidecar capital reached approximately $19.6 billion in 2025, up roughly 40% year-over-year, with sidecar structures delivering around 15% year-to-date returns attracting institutional investors including pension funds and private equity. AM Best data showed US MGA and delegated underwriting authority premium grew 14.9% to $81.4 billion in 2023 and a further 15% to $89.9 billion in 2024, marking a fourth consecutive year of double-digit growth.
The practical effect is more admitted-market options for clients who might otherwise have been pushed to surplus lines or the FAIR Plan, particularly for higher-value homes in wildfire-exposed ZIP codes. Whether that capacity holds through the next renewal cycle depends both on the Sustainable Insurance Strategy's continued rollout and on whether the broader pool of sidecar capital funding platforms like Bamboo remains available in a market where reinsurance pricing is currently softening.
