The World According to Boyar Sep 17, 2026 43m 30m saved
With Chris Mayer, Portfolio Manager and co-founder of Woodlock House Family Capital
Chris Mayer's research prompt for a company he has never owned runs about a page and a half, and the answer comes back in under fifteen minutes. He said the same work used to take a junior analyst a couple of weeks.
Most managers spend more of the week hunting for new names than tending the ones they already own. Mayer said his own split runs the other way, roughly 80% on the existing portfolio.
"I mean, I think it takes it like less than 15 minutes and it does something that I think a junior analyst would take a couple of weeks to put together."
Mayer wrote 100 Baggers, has run Woodlock House Family Capital since leaving the Bonner family office, and has spent the last three years on the board of a publicly traded Swedish company — a seat that changed what he thinks outside investors can know. He was also the first guest this show ever booked.
The full interview is covered here so you can skip it. 43 minutes of audio, 13 minutes of reading.
Here are the 11 lessons that matter.
Key Takeaways
Running other people's money did not change his philosophy, only the pain of a loss
He now opens at 2% and lets a full year of earnings run before deciding whether to size up
Martin Sosnoff's law — returns vary inversely with the thickness of the research file — matches what his own problem positions did
Constellation Software is down by half on an AI narrative, not on its numbers
The thing that would actually break his Constellation case is the reinvestment rate falling, not a bad quarter
Three years on a board taught him how wide the gap is between what directors know and what shareholders can work out
The woman he met on a flight to Omaha beat 98% of active managers by owning one stock
A 25% position cap is the fiduciary constraint an individual investor never has
1. Real Money Changes You
Mayer wrote an investment newsletter before he managed outside capital, and said the philosophy carried across intact — owner-operators, skin in the game, the same names he would have recommended. What changed was the weight of a mistake. A newsletter reader cherry-picks; a limited partner sees the whole track record.
He said most of the pressure he feels is his own, not his partners'. He hears from them by email roughly once a month, writes quarterly letters, and holds an investor call in the spring and the fall.
"Psychologically, it's very different. Psychologically, it makes the losses much more painful." — Chris Mayer
"You have that track record and that's what your investors are looking at. A lot of the pressure is self-imposed." — Chris Mayer
2. Buy It to Understand It
A claim from the new book that the host pushed him on: you cannot really understand a stock until you own it. Mayer could not fully explain the mechanism, but said the effect is reliable enough that he has changed how he starts a position — two or three percent, sometimes two, held for as long as a year while he keeps researching.
In that year he sees four quarters of earnings, listens to the calls, and talks to former employees and competitors. He was candid about the cost of the method: owning even a sliver triggers the endowment effect, which makes him slower to let go of something that is not working.
"Even if it's a small position, when you own it, the level of focus is entirely different." — Chris Mayer
"It's almost like, I don't know what a good analogy is, but like you're growing tomatoes or something. It just takes a certain amount of time. You can't rush it." — Chris Mayer
3. Sosnoff's Law
Mayer credited the investor and author Martin Sosnoff with the rule he uses to sanity-check his own effort. The more research a position needs, the worse it tends to do. He said his own experience keeps confirming it: the positions he spends the most time justifying are the ones that rarely work out, and the clean theses are the ones he barely has to touch.
"But he has this idea that the return you get on investment varies inversely with the thickness of the research file." — Chris Mayer
He also described two habits meant to stop him acting on noise. The first is deciding in advance which handful of factors actually drive a business and ignoring everything else. The second is cutting his intake of financial media, which he compared to not exposing yourself to advertising in the first place rather than trying to resist it.
"We know that you're going to respond to dramatic narratives. You're going to respond to price movements short term. So don't even try, limit your exposure as much as possible." — Chris Mayer
4. Constellation and AI
Mayer holds Constellation Software and has been public about it. The stock has had a large drawdown; the host noted it is still up about 300% since Woodlock House launched, ahead of the S&P 500 over the same stretch. Mayer's point was that nothing in the reported numbers explains the fall.
"One of the things that's so interesting about Constellation Software is that if you only looked at the quarterly numbers through all this, you would never guess the stock would be down by half." — Chris Mayer
"I don't think so far that AI derails what Constellation Software does." — Chris Mayer
Asked what would change his mind, he named the reinvestment rate rather than any single quarter. If the company started accumulating cash or paying special dividends, that would say it can no longer put its cash flows to work at high returns, and the compounding assumption behind the whole position would have to come down. Heavy turnover among long-tenured executives would be the second warning.
The host drew the parallel to Uber, one of his own largest holdings and, he said, about 25% off its highs while growing 30% year on year — a stock being marked down on what autonomous vehicles might do rather than on results. Mayer said the argument is unwinnable by design, because every defense can be answered with a claim about the future, and compared it to old-economy stocks left for dead in the late 1990s before some of them turned the internet to their advantage.
"And I think maybe the only thing that will eventually win the market over is continued good performance." — Chris Mayer
5. Surviving a Drawdown
Asked what he actually does when a position is down 30% or 50%, Mayer gave a short answer and meant it. He said he goes for long walks. He put the same question to Chuck Akre during a meltdown and got the same kind of answer: do your yoga, take the walk, put it out of your mind.
He extended it to physical setting. Akre's office in Middleburg, Virginia runs like a library, quiet and lined with books. It also depends on an investor's client base, since partners who call in a panic make calm impossible whatever the office looks like.
"I go for long walks." — Chris Mayer
"Don't sit there and watch the stock prices going down three, four, five percent every day for six months, which seemed like what happened there for a while." — Chris Mayer
6. 80/20 on Old Names
Mayer said he asks other managers how they divide their time between the portfolio they own and the search for new ideas, and that most of them spend more on the search. His own split is about 80% on names he already holds. There are transcripts to read, competitors to track and expert calls to take on every position, and he said that work never runs out.
On expert networks he was measured. Roughly 80% of what he hears is worth nothing, because former employees carry grudges and agendas; the remaining fifth occasionally produces someone who explains how the business really runs, and that is what pays for the service.
"And for me, I would say it's probably like 80, 20 existing names, new names." — Chris Mayer
7. AI as a Junior Analyst
The framing was the host's and Mayer agreed with it. He has built up a prompt of about a page and a half that he uploads with a company name, and what comes back is a usable first pass on a business he does not know.
He was clear about the limits. The model invents things, and when he asks it to cite sources the citations are sometimes not real. He also uses it to comb proxies and to compare one 10-K against the last, work that used to need dedicated redlining software.
"I mean, I think it takes it like less than 15 minutes and it does something that I think a junior analyst would take a couple of weeks to put together." — Chris Mayer
"You have to be careful with that too, because it makes mistakes, makes things up, whatever." — Chris Mayer
The host described his own use: uploading his last twenty quarterly letters and asking Claude to draft twenty pre-verified points in his own style, which gets him about 70% of the way and past the blank page. He runs Claude and ChatGPT against each other on the same question, and Mayer said he does the same.
Asked what skill still matters when the analysis is automated, Mayer said judgment. Raw analytical horsepower gets cheaper; the ability to see what a company could become does not, because a model can only work with what already exists.
"Because again, the AI is only processing things that are already out there and a great investor is still someone who has some vision about how things can happen." — Chris Mayer
8. What a Board Seat Shows
Mayer joined the board of a Swedish public company three years ago, put forward by another large investor rather than by his own request. He said the experience mostly taught him how much outside investors cannot see. He now reads write-ups and posts on X and can tell where they are wrong, and also why the author reached that conclusion with the information available.
The company side frustrates him too. Directors sit on things they would like to disclose and cannot, for competitive reasons or on the advice of counsel, so the gap between what is known inside and what is communicated outside can be very wide.
"There's a gap between what people of the board know and typical outside investor knows." — Chris Mayer
"Sometimes as outside investors, we have this thought that management teams are rational. They're making these decisions the way we would want them to be made. But sometimes it's personalities involved." — Chris Mayer
He also said the seat raised his opinion of activist investors, because he now appreciates how hard it is to move a board from outside.
9. The Woman From Nantucket
The book opens on a flight to the Berkshire Hathaway annual meeting, where the woman bumped from business class into the seat beside Mayer turned out to have been an investor in the Buffett partnership. She rolled into Berkshire, left it alone, ended up living in Nantucket and giving shares to her grandchildren.
"This woman, she's got a track record and beats 98% of all active money managers who were doing something vastly different than what she did." — Chris Mayer
Mayer used her to ask whether she counts as a great investor at all, and paired her with Sam Walton, who nobody describes as an investor even though he held one stock for decades. His answer was that the more useful question is what a professional can copy from either of them.
10. Taxes and Holding On
The host raised the fiduciary problem: a manager whose single best idea grows into a third of the fund has to trim it. Mayer said his own hard limit is 25%, and that this is where an individual investor has a structural edge, because nobody forces them to sell a winner.
"I find I have a hard limit of 25%." — Chris Mayer
He told the story of the New Horizons Fund, which bought Walmart early as a small-cap fund in the 1970s and 1980s and sold continuously as the position kept breaching its size limit. Someone later calculated that the untouched stake would have been worth more than the fund's entire assets. He said tax is a real motivation for individuals, but not his own: he invests his IRA money the same way, which he takes as evidence the method is about returns rather than deferral.
11. Felix Dennis's Answer
Mayer said the closing chapters are about why a person does this at all, and that too many investors reduce the answer to whether they beat the S&P 500. His example was someone who compounded at 8% for thirty years while the index did 10%, and who learned how businesses work along the way. The shortfall is real and large, and he still declined to call that a failure.
His favorite figure in that section is Felix Dennis, the magazine publisher who wrote How to Get Rich and was blunt about the cost.
"And then at the end he's pretty honest about like is he happy because of that and he flat out tells you no." — Chris Mayer
"The best things he likes to do are things that don't cost any money at all." — Chris Mayer
Bonus Insights
The recording kept running after the formal goodbye, and the two of them traded names for several minutes. Mayer's comments here are watchlist talk rather than positions.
On Pool Corp: he watched it compound for years without owning it, and the executive who built the business has since left. The board is still in place. He named Home Depot buying a competitor as the thing that would put him off
On the broader quality-compounder group, including Pool Corp: the post-COVID premium in these multiples has burned off, and several now trade well below their own history rather than merely below the market
On Brown & Brown, which he has owned since the fund's first day: international is now around 15% of revenue, almost all of it the UK, where there was essentially none when he bought. Competition for acquisitions from private equity has intensified, and the average size of the top 50 brokers has grown a great deal
He noted Brown & Brown repurchased stock in the last two quarters, and that management flagged on its most recent call that some property pricing has fallen back to 2016 levels in a matter of months. He added that the absence of a major catastrophe over the past two years has hurt the brokers, and said he does not want one
On Ryan Specialty: more leveraged and concentrated in excess and surplus lines, which he called the more volatile part of the market. He looked carefully and did not buy, and said it has since bounced
On W. R. Berkley: solid, though he has focused on brokers rather than insurers. The host listed why it fits his own checklist — family run, net cash, short duration on the bond portfolio, specialty lines
On Rollins: badly hammered against its own history after years of going straight up. He would not call it outright cheap, said another weak quarter might deliver a better entry, and pointed to route density as the economics — an extra customer on an existing truck route carries a very high incremental margin
Mayer's bottom line is that the edge he is playing for is behavioral rather than analytical: pick businesses whose essential drivers you can name, start small enough to keep learning, stop watching the screen, and let time rather than activity do the compounding.
Products, Companies & Tools Mentioned
Constellation Software (His live example of a stock cut in half on an AI narrative while the quarterly numbers stayed on plan)
Woodlock House Family Capital (The fund he co-founded and runs, with a 25% hard limit on any one position)
Uber (The host's largest problem child — down about 25% from its highs on autonomous-vehicle fears while growing 30% a year)
Claude and ChatGPT (Both men run the two against each other on the same question; Mayer's page-and-a-half prompt produces a first-pass analyst report in under 15 minutes)
Brown & Brown (Owned since the fund's first day; UK business now around 15% of revenue and buybacks in each of the last two quarters)
Berkshire Hathaway (The annual meeting the book opens on, and the single holding behind the Nantucket investor's record)
Walmart (Twice over — an old-economy company that turned the internet to its advantage, and the position the New Horizons Fund was forced to keep selling)
Pool Corp (A watchlist name he never bought; Home Depot acquiring a competitor is what gives him pause)
Ryan Specialty and W. R. Berkley (Two insurance names he looked at and passed on, the first for leverage and excess-and-surplus volatility)
Rollins (Pest control, down hard against its own history; route density is the margin argument)
Home Depot (The competitor whose entry into pool supplies kept him out of Pool Corp)
Books & Resources Mentioned
The Investor's Odyssey – Chris Mayer (The new book this interview is built around, opening on the flight to Omaha)
100 Baggers – Chris Mayer (His earlier book, which the host names as a favorite)
Humble on Wall Street and Silent Investor, Silent Loser – Martin Sosnoff (Where the rule about research-file thickness comes from)
How to Get Rich – Felix Dennis (Written before Dennis got rich, and honest that the money did not make him happy)
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