Sam Altman

Altman is a prolific early-stage investor who backs deep tech and moonshot ideas. His portfolio through YC and personal investments includes hundreds of companies.

His personal bets tend toward civilizational-scale technology — nuclear fusion, longevity research, AI safety. He has said he thinks the most important investments of the next decade will be in energy and AI.

He has repeatedly said he holds no equity in OpenAI itself, which is unusual for a founder running a company of that size and something he has been asked about constantly.

Stig Brodersen

Pure value investing in the Buffett-Graham tradition. Stig looks for companies trading below intrinsic value with strong competitive advantages, honest management, and a margin of safety.

He takes a concentrated approach — he'd rather own 10-15 well-understood positions than 50 diversified ones. He does deep fundamental analysis: reading annual reports, understanding unit economics, and calculating intrinsic value using discounted cash flow models.

He has an international perspective that most American value investors lack — he actively looks at companies in Europe, Asia, and emerging markets. He believes international markets are less efficiently priced than US markets, creating more opportunities for value investors.

Sam Altman

Altman believes we are approaching AGI — artificial general intelligence — and that it will be the most transformative and potentially dangerous technology humans have ever built. He thinks the right response is to build it carefully rather than cede the frontier to those who might not.

He argues that the returns from AI will be so large they will need to be distributed broadly to prevent catastrophic inequality. He has floated ideas around universal basic income funded by AI productivity.

Stig Brodersen

Stig believes that investing should be approached with intellectual humility and continuous learning. His core philosophy: understand what you own, buy it at a price that gives you a margin of safety, and be patient.

He thinks most investors trade too frequently and react too emotionally to short-term market movements. He values international diversification more than most American investors, arguing that US-centric portfolios miss significant opportunities.

He also believes strongly in the democratization of financial education — TIP was built on the principle that world-class investing knowledge should be free.

Sam Altman

Altman has said that playing it safe at this moment in history is the most dangerous thing he could do. His belief: AGI is coming whether OpenAI builds it or not — the only question is who builds it and with what values.

That conviction makes conventional risk aversion feel irresponsible to him. He holds large personal positions in nuclear fusion companies and longevity biotech — bets that could return 1000x or go to zero.

He has said that any genuinely interesting bet carries existential downside risk. That is what makes it interesting, not a reason to avoid it.

Stig Brodersen

Moderate. Stig is concentrated but disciplined.

He won't buy something unless his downside analysis shows limited risk of permanent capital loss. He's willing to hold cash when he can't find cheap stocks — sometimes 20-30% of his portfolio.

He's less speculative than Preston and has stayed closer to the original value investing framework. He manages risk through deep understanding of each position rather than through broad diversification.

Sam Altman

He has written about sleeping 8 hours, exercise, not scheduling meetings before 11am, eating the same lunch every day, and blocking large chunks of uninterrupted time for thinking. He is a known prepper — he has said he owns land, gold, guns, and antibiotics in case civilization collapses, which is a mildly alarming admission from the CEO of the company building AGI.

Stig Brodersen

Stig is methodical and disciplined. He reads extensively — annual reports, investing books, economic history, and academic research.

He maintains a structured process for evaluating potential investments and doesn't deviate from it based on market emotions. He lives in Denmark and maintains a lower public profile than many financial media personalities.

He reinvests podcast income into both his business and his personal investment portfolio.

Sam Altman

OpenAI and ChatGPT. The launch of ChatGPT in November 2022 was the most consequential product launch in tech in at least a decade.

It brought AI from a niche technical field into mainstream awareness overnight and made OpenAI the fastest-growing AI company in history. Altman navigated the transition from nonprofit to commercial entity, secured $13 billion from Microsoft, and built a company valued at $157 billion within five years.

Stig Brodersen

Co-building The Investor's Podcast Network into a global phenomenon. The show's reach — 100 million+ downloads — means Stig has directly contributed to the financial education of millions of people across dozens of countries.

His interviews with top investors have created a free archive of investing wisdom that rivals any MBA curriculum. On a personal investment level, his consistent application of value principles across international markets has produced solid long-term returns.

Sam Altman

Being fired by his own board in November 2023 — and the board's subsequent reversal. Whatever actually happened in those five days is still murky.

What is clear is that the board lost control of the situation the moment it became obvious that without Altman, most of the company would leave. The board members who voted to fire him are gone.

Altman is back with more power. The episode revealed real governance problems at one of the most consequential companies in history.

Stig Brodersen

Stig has been open about early investment mistakes where he bought companies that were cheap for a reason — value traps where the low price reflected genuine business deterioration rather than market mispricing. He's talked about the importance of distinguishing between "cheap" and "good value," which is one of the hardest lessons in value investing.

He's also acknowledged that running a media business while managing a personal portfolio creates time allocation challenges.

Sam Altman

Sam Altman dropped out of Stanford in 2005 to co-found Loopt, a location-sharing startup. Loopt was acquired in 2012 for $43 million — not a huge exit but enough to establish him as a serious founder.

He then became president of Y Combinator in 2014, succeeding Paul Graham. Under Altman, YC expanded from a small cohort model to a much larger operation with global reach, including backing Airbnb, Dropbox, Stripe, and hundreds of others in its portfolio.

In 2019, he stepped down from YC to become CEO of OpenAI. The company launched ChatGPT in November 2022, which became the fastest-growing consumer application in history — 100 million users in two months.

In November 2023, the board fired him. The entire company revolted.

Microsoft — OpenAI's biggest investor — nearly hired him to run a new AI division. Five days later, he was reinstated with a restructured board.

OpenAI's valuation hit $157 billion in 2024 and roughly $852 billion by 2026.

Stig Brodersen

Stig Brodersen grew up in Denmark and studied business and finance. He earned his MBA and worked in corporate finance before deciding his real passion was investing education.

He connected with Preston Pysh online through their shared love of Warren Buffett and Benjamin Graham, and they launched The Investor's Podcast in 2014. The concept was brilliantly simple: read the classic investing books that every successful investor recommends, break them down chapter by chapter in plain language, and give them away for free as a podcast.

It worked beyond anyone's expectations. The show grew into The Investor's Podcast Network, now hosting multiple shows including We Study Billionaires, Millennial Investing, and Bitcoin Fundamentals.

The network has surpassed 100 million total downloads. When Preston shifted his focus to Bitcoin, Stig took the lead on We Study Billionaires, conducting in-depth interviews with legendary investors.

He's interviewed Howard Marks, Mohnish Pabrai, Guy Spier, Tobias Carlisle, and dozens of other investing heavyweights. He also co-authored books with Preston on Buffett's investment methods.

Sam Altman

OpenAI (CEO). Y Combinator (former president).

Loopt (co-founder, acquired 2012). Personal investments through Hydrazine Capital and a long list of early-stage bets.

Notable: Stripe, Helion Energy (nuclear fusion, where he is also chairman and the largest investor), and Retro Biosciences (longevity), which he seeded with $180 million of his own money.

Stig Brodersen

The Investor's Podcast Network — co-founded with Preston Pysh, one of the largest financial media networks in the world. We Study Billionaires — the flagship podcast, now primarily hosted by Stig.

He co-authored books on Warren Buffett's investment frameworks with Preston Pysh. He also runs his own investment portfolio following value investing principles.

Sam Altman

Stanford University — studied computer science. Dropped out in 2005 after his sophomore year to found Loopt.

Stig Brodersen

Stig earned an MBA with a focus on finance and business. His academic background in business gives him a structured analytical framework for evaluating companies.

He's also self-educated through hundreds of investing books that he's read and discussed on the podcast — the show itself has been his ongoing graduate education in investing.