Reinsurance: The Only Two Stocks With a Perfect Score

2026-07-03 · By Lubin Danilo, founder of Lubin Investment

Reinsurance, the business of insuring insurers against disasters, is a sector most retail investors avoid. Out of my ten quality criteria, only RenaissanceRe (RNR) and Arch Capital (ACGL) score a perfect ten. One is a disciplined pure specialist, the other a diversified group, and today their price tags look nothing alike.

Reinsurance: the sector retail investors avoid

The first time I opened a reinsurer's filings, it took me a good fifteen minutes to understand how a company that sells insurance to insurance companies could post margins like these. Most people have never heard of this business: it sounds technical, it's tied to hurricanes and earthquakes, and it's widely seen as too cyclical for an individual investor.

As a result, an entire sector sits under the radar even though it's home to two of the highest-rated companies in my whole screener: RenaissanceRe (RNR) and Arch Capital Group (ACGL). Out of the ten quality criteria I apply to every stock, both score a perfect ten. Across my entire coverage universe, they're the only two that manage it.

A regular insurer, the one that covers your car or your home, doesn't want to carry alone a risk big enough to bankrupt it overnight, say a hurricane that destroys ten thousand houses in a single day. So it turns to a reinsurer, which agrees to take on part of that risk in exchange for a premium, the same way it insures you. Reinsurance is simply insurance for insurers.

• RenaissanceRe (RNR) and Arch Capital (ACGL) are the only two companies in my entire screener to earn a perfect quality score across ten criteria, out of dozens of publicly traded reinsurance names.
• RNR is a pure, highly concentrated catastrophe reinsurance specialist; ACGL is a diversified group spanning primary insurance, reinsurance and mortgage insurance, with its own Lloyd's of London syndicate.
• On price, the gap is wide today: RNR trades at 2.91 times its annual free cash flow versus 5.59 times for ACGL, making RNR noticeably more attractive at current prices.
• Both generate a return on invested capital above 24% with almost no debt, a rare combination in a sector known for being cyclical and capital-intensive.
• A perfect score is not a buy signal on its own: quality and price are two separate questions, and I break down why further below.

How I judge a stock, before I even look at price

Before looking at a stock's price, I always separate two questions most people blend together. First: is this a good business? Second, completely apart from the first: is today a good price for it? I've codified the first question into ten concrete financial criteria: profitability, sales and cash growth, debt discipline, return on invested capital, and a few others drawn from serious financial literature. A stock that checks all ten boxes earns a perfect score. That's rare: across the entire publicly traded reinsurance sector, only two companies pull it off.

RenaissanceRe (RNR): the pure catastrophe specialist

RenaissanceRe was founded in Bermuda in 1993, just months after Hurricane Andrew wrecked part of the US insurance market and sent reinsurance prices soaring. Investors, including the private equity firm Warburg Pincus, put up $140 million to launch a new kind of reinsurer, one built on mathematical risk pricing models instead of gut-feel underwriting.

The company has barely strayed from that core business since. It insures other insurers against natural catastrophes (hurricanes, earthquakes, floods) while also running third-party capital vehicles like DaVinci Re, which let outside investors, not RNR's own balance sheet, absorb part of the risk. Its moat, its competitive edge, comes from decades of proprietary catastrophe risk data and an underwriting discipline that systematically walks away from badly priced business, even when that means giving up growth.

The numbers back up that discipline. RNR posts a free cash flow margin of 36.5%: out of every $100 of revenue, $36.50 ends up as cash genuinely available after all expenses. Its return on invested capital (Cash ROCE, the cash generated relative to the capital used to produce it) reaches 30.6%, its net margin sits at 24.2%, and revenue has grown roughly 28% a year on average over five years. Net debt equals just 0.18 times annual free cash flow, next to nothing. Of my ten criteria, only one isn't marked a clean pass: days sales outstanding, a figure that can't be reliably calculated for this kind of business, so it's treated as neutral rather than as a flaw.

Today the stock trades at 2.91 times its annual free cash flow, at a price of $288.50 and a market capitalization of roughly $12.3 billion. That's cheap enough that my screener flags RNR as a current opportunity: a top-quality business priced as if it were worth much less. You can see the full breakdown on the RenaissanceRe analysis page.

Arch Capital (ACGL): the Bermuda generalist with a foothold at Lloyd's

Arch Capital was founded in 2000 by Robert Clements and Peter Appel, right as the specialty insurance market was going through one of its toughest stretches. Unlike RNR, Arch never chose to stay a pure reinsurer. It built itself as a three-legged group: primary insurance (liability, commercial property), reinsurance, and mortgage insurance, the product that protects a lender if a borrower defaults on a home loan.

That diversification is its moat. Where RNR bets everything on discipline in one highly cyclical business, Arch can shift capital year to year toward whichever line offers the best risk-adjusted return: more mortgage insurance when housing is strong, more reinsurance when prices spike after a major catastrophe. Arch also runs its own Lloyd's of London syndicate, Syndicate 2012, a way to underwrite specialty risks directly in the London market instead of relying solely on its own subsidiaries.

On the numbers, Arch posts a free cash flow margin of 28.8%, a Cash ROCE of 24.2%, a net margin of 25.6% (the higher of the two, worth noting), and average revenue growth of about 22.7% a year over five years. Net debt equals 0.32 times free cash flow, still very low in absolute terms, but almost double RNR's ratio. Of my ten criteria, only one falls short of a clean pass: days sales outstanding, estimated at 70 days, a minor and unremarkable flag.

The stock trades at $91.21, for a market capitalization of roughly $31.9 billion, nearly three times RNR's size. Its valuation works out to 5.59 times annual free cash flow: pricier than RNR, and not cheap enough right now for my screener to flag it as an immediate opportunity. Full details on the Arch Capital analysis page.

Side by side, the two names tell two different stories about how to reach the same level of excellence.

What really sets them apart

The biggest difference isn't in the numbers, it's in the structure of the risk. RNR concentrates on a single type of shock, natural catastrophe, which can make a bad year more volatile (an exceptional hurricane season can hurt), but it offsets that by pushing much of the risk onto third-party capital instead of its own balance sheet.

Arch, by contrast, smooths its results across three businesses: when mortgage insurance slows with the housing market, reinsurance can pick up the slack, and vice versa. That's less concentrated, and in theory less risky line by line, but it's also a more complex machine to run, with more business lines where underwriting discipline could slip somewhere without immediately showing up in consolidated numbers.

The trade-off is a classic one: disciplined concentration on one side, managed diversification on the other. Both work, proven by the perfect score, but they're not the same bet.

Hard markets, soft markets: why this sector spooks retail investors

Reinsurance moves in cycles professionals call hard markets and soft markets. After a major catastrophe (Hurricane Ian in 2022 cost the industry more than $100 billion), the reinsurers left standing can raise prices sharply because available capacity shrinks: that's a hard market. Over time, profits attract fresh capital, supply increases, and prices soften: that's a soft market.

That exact cycle explains RNR's and ACGL's striking growth over the past five years: both rode the hard market that followed the 2022 and 2023 catastrophes and used it to underwrite business at very favorable prices. It's also what scares off newcomers to the sector: growth that partly depends on the frequency of natural disasters can look like a bet on the weather. In reality, the real skill here isn't predicting catastrophes, it's pricing them correctly and walking away when prices no longer cover the risk, which is exactly what my financial discipline criteria are built to catch.

Why only two perfect scores across an entire sector?

Reinsurance is home to dozens of publicly traded players, from century-old giants to small specialty capital vehicles. Most fail one or two of my ten criteria: too much debt after an acquisition, erratic growth, profitability that collapses after a bad catastrophe season, or capital allocation that chases size over shareholder returns. RNR and ACGL are the only two that simultaneously check high profitability, sustained growth, solid returns on capital and near-zero debt, across a full cycle that includes the bad years. It's no coincidence that both also rank among the sector's most respected names with rating agencies and brokers.

Quality doesn't tell the whole story: which one looks better priced today?

A perfect score answers one question only, business quality. It says nothing about what you'd pay for that quality today, and that's exactly where RNR and ACGL diverge.

RNR trades at under 3 times its annual cash flow, a low valuation for a business of this caliber, which is why my screener currently flags it as an opportunity. ACGL, despite an equally perfect score, trades at nearly double that multiple relative to its cash: the market already grants it a premium, likely for its diversification and its size, nearly three times larger. Neither is a buy recommendation on its own, it's a starting point for further research, not a conclusion.

My method, in one sentence

I never wanted to guess whether a hurricane would hit Florida this year. What I wanted was to be able to judge any stock, reinsurer or not, on objective financial criteria, separate from noise and price, in a few seconds. That's exactly what my site does: a quality score across ten criteria, a clear valuation reading, and an opportunity flag when the two line up. You can find the whole sector, RNR and ACGL included, in the full screener ranking, or read the details of my analysis method.

FAQ

What is reinsurance, in plain English?

It's insurance for insurance companies. A regular insurer transfers part of its heaviest risks, typically natural catastrophes, to a reinsurer in exchange for a premium. That way, a single extreme event doesn't threaten its ability to pay every policyholder.

Why do retail investors avoid this sector?

Because it looks technical, cyclical, and tied to unpredictable events like hurricanes. In reality, top performers like RNR and ACGL aren't betting on the weather: they make money by pricing risk correctly and walking away from underpriced business, something you can actually see in standard financial criteria.

RenaissanceRe or Arch Capital, which one should I look at?

Both earn the same perfect quality score, but they're very different bets: RNR is a concentrated play on catastrophe underwriting discipline, currently trading cheap; ACGL is a diversified group priced richer today. The choice depends on your tolerance for risk concentration and your read on price, not just on quality.

What is the P/FCF (price-to-free-cash-flow) ratio you use?

It's a stock's price divided by its free cash flow, the cash a company actually has left after all its expenses. A P/FCF of 3 means you're paying today for three years of that cash. The lower it is, the cheaper the stock relative to the cash it produces.

Does a perfect quality score mean I should buy the stock?

No. The score measures business quality, not the right time to buy. A great business bought at too high a price is still a bad investment. I always look at both separately before forming a view, and this isn't personalized investment advice.

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About the author

Written by Lubin Danilo, founder of Lubin Investment. A self-taught individual investor, I find fundamental analysis fascinating, and it has delivered excellent results. For three years now, my performance has beaten the S&P 500. But analyzing every stock took too much time: sites with incomplete data, calculation methods and criteria never aligned with mine. And spotting the best stocks was just as time-consuming, even with my own well-defined checklist. So I put my software development background to work to build this software, base my investment strategy on its results, and share it with people who share the same passion as me. It judges a company's quality and its price separately, using criteria drawn from the financial literature (Warren Buffett, Michael Mauboussin, Aswath Damodaran).