Three markets are pricing RDN off three different numbers. The equity at $35.37 sits at our bear-case intrinsic value (P/BV 1.00). The options market — IV Rank 96%, puts IV 59% vs calls 35.6%, skew 1.66x — is paying up for the guide-miss tail. Sell-side analyst targets ($39.33 mean, KBW $43) anchor to management's mid-teens EPS accretion guide. The mispricing isn't in the tape; it's in the analyst targets versus what the company's own pro forma now discloses. The cleaner expression appears to be a pair against MTG on April 29 Q1 confirmation, not a directional position today. Directional edge (-5% / 12mo blended) doesn't clear borrow plus transaction costs. Pair edge (~+6-9% / 12mo) isolates the ≈25-30% of RDN's variance where the mispricing lives from the ≈70% that's pure US MI beta.

The bridge math. RDN's 8-K/A pro forma for FY2025 shows diluted EPS of $4.77, a +8.6% lift over standalone $4.39. Mid-teens accretion (13-17%) requires FY26 EPS of $4.95-5.13, or $0.18-0.36 per share beyond the 2025 pro forma baseline. That's Inigo 2026 net income in the range of $255-290M versus $228M reported 2025 — a 12-27% year-on-year increase. The gap closes only if (a) Inigo's combined ratio holds near 2025's 82.8%, and (b) a net investment income tailwind from the expanded asset base contributes incrementally. Both conditions required, not either.

Why the math breaks. We estimate Inigo's normalized through-cycle combined ratio at 90% (range 88-92%). 2025 was a benign US catastrophe year; Inigo's book is 54% reinsurance and 67.6% US-located — exactly the mix that reprices in a cat year. A reversion from 82.8% to 90% on $1.11B of net earned premium adds ≈$80M of losses, or roughly $60M after tax. That alone converts +8.6% accretion to ≈0%. On top of that, Lloyd's property catastrophe pricing is softening broadly: WRB reported 1/1/2026 rates -19% risk-adjusted (accelerating from -15% prior year), EG -10% globally, RNR "low teens" down, GLRE "market softening most lines." No peer signaled hardening at any 2026 renewal date. And the $200M acquisition revolver costs $9.8M/year in interest. Management's guide survives only if 2026 is as benign as 2025 and the NII tailwind covers the CR reversion. We think consensus is modeling Inigo's normalized CR at 85-88%; the disagreement is 2-5 points of combined ratio.

Management signal cluster. Three data points post-close: (1) CFO Sumita Pandit was involuntarily terminated February 12, 2026 — ten days after close — with no permanent search announced; Interim CFO Daniel Kobell signed the pro forma filing. (2) The Mortgage Insurance business was restructured to co-heads the same day, an unusual structure that suggests either specialization or succession uncertainty. (3) CEO Richard Thornberry sold 80,000 shares for $2.76M across four monthly S-code Form 4 dispositions (July-October 2025), during the period Inigo was being negotiated. The regular monthly cadence suggests a Rule 10b5-1 plan (reduces signal strength); plan-adoption timing is not independently verified. On their own, any of these is noise. Together, they're a cluster around a transformational deal.

Factor decomposition. RDN is ≈70% US mortgage insurance, ≈30% Inigo specialty after the acquisition. Our bear thesis addresses factors with ≈30% combined loading (Inigo normalized CR, Lloyd's softening, management signal, 2026 cat). The other ≈70% — US MI core, housing cycle, rates/NII — we have no edge on. Stock is already +7.9% 1M, RSI 84, broke above 200DMA today on ≈0.4x average volume: pure MI-beta move. A directional position nets against US mortgage insurance; the pair versus MTG (≈95% pure-play US MI) nets out that beta and isolates the ≈30% Inigo factor loading where the edge actually lives.

Risks (ranked).

1. Benign 2026 cat year + cycle bottoming — light Atlantic season + stable June 1 Florida renewals make the guide reachable on run-rate.
2. MI core tailwind — housing/rates can grind the stock up regardless of Inigo outcomes. Dominates on a directional position.
3. Reserve release persistence — consistent favorable development adds 1-2pp to accretion math.
4. Reverse confirmation — permanent external CFO hire, or Q1 Inigo CR ≤85%, weakens the management cluster and the normalized-CR thesis respectively.

Catalysts.

• April 22-24: RNR, ACGL, TRV Q1 2026 earnings — Lloyd's cycle color.
• April 29: RDN Q1 2026 — first combined quarter; guide reaffirmation or walk-back. This is the resolver.
• June 1: Florida wind reinsurance renewals.
• July 15-31: Q2 2026.
• Aug-Oct: Atlantic hurricane season peak.
• February 2027: FY26 full-year results — the full accretion thesis resolves.

What would change our mind. RDN Q1 Inigo segment CR ≤85% with reaffirmed guide invalidates the normalized-CR estimate. RNR/ACGL Q1 commentary signaling hardening at June 1 weakens the softening factor. Permanent external CFO with specialty insurance background reduces the management cluster. Two consecutive benign cat years deprioritizes the reversion tail.

Evidence