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The Motley Fool

David Gardner, co-founder of The Motley Fool, is among the most respected and trusted sources on investing. As a best-selling author, hugely successful stock picker, and financial authority, David has led The Motley Fool’s growth into a worldwide investment and financial advisory services company. Each week David shares his insights into today's most innovative and disruptive publicly traded companies -- and how to profit from them by following his signature “Rule Breaker Investing” principles.
Pre-order David's new book, Rule Breaker Investing, to dive deeper into these game-changing principles: https://lnk.to/rulebreakerinvesting

Rule Breaker Investing

March Madness may be over, but the Mailbag is just beginning—and as always, you’re the star of the show. This month we hear from listeners who tracked the data on our Market Cap Game Show strategies (does “always disagree”… really work?), revisit a thoughtful challenge from Professor Jason Corso on whether Rule Breaker Investing is built on habits, recipes, or something closer to an algorithm, pick up a clever Google News hack that lets you see the world through another country’s headlines, and yes… return to Pet Peeves territory with a “Bamm!” vs. “Boom!” breakdown of locker room acoustics. Along the way, we touch on how we think, how we learn, and how we behave—in markets and in life.And we close with one Fool’s simple question: Does the Snap Test apply… beyond stocks?

Sign up for The Motley Fool’s Breakfast News here: ⁠⁠⁠⁠⁠⁠www.fool.com/breakfastnews⁠⁠⁠⁠⁠⁠

Order David’s Rule Breaker Investing book here: ⁠⁠⁠⁠⁠⁠https://www.amazon.com/gp/product/1804091219/⁠⁠⁠

Companies mentioned: AXON, DIS

Host: David GardnerProducer: Bart Shannon

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March 2026 Mailbag: Habits, Hacks & “Boom”

The bracket is complete. The stakes are highest. And now… it’s time to crown a champion.This week on Rule Breaker Investing, defending champion Emily Flippen faces off against Cinderella challenger Loren Horst in the March Market Cap Madness World Championship. As always, you’re not just watching—you’re playing along. Ten companies. Ten chances to test your market cap intuition. Range it… and decide: in or out?From elevators to hotel loyalty programs to the strange ways we all think about “blood,” this one takes a few delightfully unexpected turns along the way. Throwdowns raise the stakes, instincts get tested, and you’re right there in it the whole time. Keep your own score, trust your gut, and see how you stack up.

Companies mentioned: DGX, H, LYV, MAR, OTIS, PLTR, SBUX, SNOW, TRMB, TXN

Sign up for The Motley Fool’s Breakfast News here: ⁠⁠⁠www.fool.com/breakfastnews⁠⁠⁠

Order David’s Rule Breaker Investing book here: ⁠⁠⁠https://www.amazon.com/gp/product/1804091219/⁠⁠

Host: David GardnerGuests: Emily Flippen, Loren HorstProducer: Bart Shannon
Learn more about your ad choices. Visit megaphone.fm/adchoices

2026 March Market Cap Madness Championship: Loren v. Emily

The Madness continues! This week on Rule Breaker Investing, the second semifinal of March Market Cap Madness tips off as defending world champion Emily Flippen faces long-time Motley Fool advisor Bill Barker for a place in the championship round. It is a rematch of the epic Final Four game they played this very week one year ago.

As always, the real game is for you: ten companies, ten market-cap ranges, and one simple question each round: Inside or outside? Play along and keep score as you listen—and see if your intuition can meet or beat our two veteran Foolish analysts.

Companies mentioned: ABNB, ACM, ADYEY, GRAB, MIELY, MSCI, PAYC, SKYT, TDG, WIX

Host: David GardnerContestants: Bill Barker, Emily FlippenProducer: Bart Shannon
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2026 March Market Cap Madness: Emily vs. Bill (BEMILY 2!)

March Market Cap Madness tips off its Final Four this week on Rule Breaker Investing, and you’re not just watching—you’re playing. Past world champion Andy Cross (6–1 lifetime) squares off against Cinderella contender Loren Horst (1–0) in our first semifinal matchup, with a spot in the World Championship at stake. Grab a pencil, set your ranges, and see whether your market-cap intuition can outscore Andy, Loren… or both. The Madness is on, and the bracket is tightening.

Companies mentioned: ACN, AMD, BA, CSU, GLOB, IDXX, INTU, SERV, TCEHY, WIX

Sign up for The Motley Fool’s Breakfast News here: ⁠⁠⁠⁠⁠www.fool.com/breakfastnews⁠⁠⁠⁠⁠

Order David’s Rule Breaker Investing book here: ⁠⁠⁠⁠⁠https://www.amazon.com/gp/product/1804091219/⁠⁠

Host: David GardnerContestants: Andy Cross, Loren HorstProducer: Bart Shannon
Learn more about your ad choices. Visit megaphone.fm/adchoices

2026 March Market Cap Madness: Andy vs. Loren

This week’s Mailbag picks up where Pet Peeves left off—and then some. Listeners write in with their own linguistic grievances, from “10 straight unanswered points” to the curious inflation of words like “countless,” to the conversational reflex of “Right?” that may or may not actually validate anything. Along the way, we touch on Evernote in an AI world, foreign exchange risk from a Fool down under, and the eternal market phenomenon of buying the day before the drop. It’s playful, pointed, and a reminder that words shape how we think… and how we invest.

Sign up for The Motley Fool’s Breakfast News here: ⁠⁠⁠⁠www.fool.com/breakfastnews⁠⁠⁠⁠

Order David’s Rule Breaker Investing book here: ⁠⁠⁠⁠https://www.amazon.com/gp/product/1804091219/⁠⁠

Host: David GardnerProducer: Bart Shannon
Learn more about your ad choices. Visit megaphone.fm/adchoices

February 2026 Mailbag: Countless… Right?

It’s been 27 months since this series’s last installment, which means David has had time to quietly bottle up a fresh batch of entirely new irritations—all original, no repeats. This year’s edition takes aim at the slippery phrase “Buy Now, Pay Later,” the suspicious preface “If I’m being honest…,” and the curious cultural surrender embedded in “In my day…“.Along the way, there’s a certain Halloween-sized marketing sham, a conversational tic that may deserve early retirement, and a high-decibel train experience you may never un-hear again.Part humor, part language audit, part cultural critique—Pet Peeves returns to remind us that words matter, incentives matter, and yes… it is still your day.

Sign up for The Motley Fool’s Breakfast News here: ⁠⁠⁠www.fool.com/breakfastnews⁠⁠⁠

Order David’s Rule Breaker Investing book here: ⁠⁠⁠https://www.amazon.com/gp/product/1804091219/⁠⁠

Host: David GardnerProducer: Bart Shannon
Learn more about your ad choices. Visit megaphone.fm/adchoices

Pet Peeves, Vol. 9: Buy Now, Pay Later… Right?

Ten years ago this week, in the teeth of a downturn, David picked five stocks under the banner “5 Stocks to Feed the Bear.” This week, he and longtime Fool Rick Munarriz revisit that full basket—not after a month, a quarter, or a year, but after a much better, truer timeframe for the Rule Breaker Investor: 10 years. To the very day.Which stocks did David get really right? Which ones really wrong? And why? As always, in this third installment of our new episodic series, it’s not about cherry-picking highlights—it’s about accountability and perspective. It’s about what a 10-year scorecard teaches that the financial media’s shorter windows simply can’t.And the results of this sampler—along with the full program of all 30 5-stock samplers—once again prove the eye-popping success and durable wins that come to Rule Breaker investors.

Sign up for The Motley Fool’s Breakfast News here: ⁠⁠www.fool.com/breakfastnews⁠⁠

Order David’s Rule Breaker Investing book here: ⁠⁠https://www.amazon.com/gp/product/1804091219/⁠⁠Companies mentioned: CRI, ELLI, IPGP, MELI, PLNTHost: David GardnerGuest: Rick MunarrizProducer: Bart Shannon
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10 Years Later: 5 Stocks to Feed the Bear

Kevin Kelly—founding editor of Wired magazine and a lifelong observer of technology in motion—returns to Rule Breaker Investing for a conversation about how the future actually shows up. We don’t trade in predictions here. Instead, Kevin shares ways of noticing long arcs, understanding why certain platforms and ideas compound, and staying optimistic without getting swept up in hype. From AI working alongside other AIs to the power of patience and perspective, this episode is an invitation to slow down just enough to see what really matters as change unfolds.

Sign up for The Motley Fool’s Breakfast News here: ⁠⁠www.fool.com/breakfastnews⁠⁠

Order David’s Rule Breaker Investing book here: ⁠⁠https://www.amazon.com/gp/product/1804091219/⁠⁠

Host: David GardnerGuest: Kevin KellyProducer: Bart Shannon
Learn more about your ad choices. Visit megaphone.fm/adchoices

Let’s Talk About the Future in 2026 with Kevin Kelly

This week’s Rule Breaker Investing Mailbag brings together beautiful questions and stories to start the new year. We wrestle with a values-alignment dilemma around owning Robinhood, explore what it looks like to turn investing into a real, score-kept game for kids (including outperforming Dad), consider a mischievous strategy for the Market Cap Game Show, and close with an inspiring note from a retired basketball coach whose patient, optimistic approach built lasting financial freedom. Along the way, we’re reminded that investing isn’t just about returns—it’s about judgment, temperament, family, and choosing to be a “for” person over time.

Sign up for The Motley Fool’s Breakfast News here: ⁠www.fool.com/breakfastnews⁠

Order David’s Rule Breaker Investing book here: ⁠https://www.amazon.com/gp/product/1804091219/⁠

Companies mentioned: HOOD, MELI, NFLX, TTD

Host: David GardnerProducer: Bart Shannon
Learn more about your ad choices. Visit megaphone.fm/adchoices

January 2026 Mailbag: Values, Kids, Games & Inspiration

Risk gets talked about a lot in investing—and often defined poorly. This week on Rule Breaker Investing, David is joined by Motley Fool analysts Alicia Alfiere and Yasser El-Shimy to walk through his full 25-point risk rating system, a framework he’s used for more than a decade to replace vague labels like “medium risk” with something concrete and measurable. Using Etsy and Duolingo as live 2026 case studies, the trio scores each company question by question—covering the business, financials, competition, leadership, and the investor’s own willingness to dig deeper. Along the way, listeners get a deeper look at how studying risk is really about studying quality—and how seeing risk clearly with a number is just another way Rule Breaker investors can learn to break the rules….

Companies mentioned: DUOL, ETSY

Host: David GardnerGuests: Alicia Alfiere, Yasser El-ShimyProducer: Bart Shannon
Learn more about your ad choices. Visit megaphone.fm/adchoices

2026 March Market Cap Madness Championship: Loren v. Emily

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