Investing Between the Lines: How to Make Smarter Investment Decisions by Decoding CEO Communications

L. J. Rittenhouse's method for evaluating companies by analyzing how their CEOs communicate — specifically, the candor, consistency, and ownership-mentality revealed in shareholder letters. She scores letters against 25 'Culture' questions, arguing that the quality of a CEO's communication is a reliable leading indicator of governance quality and long-term returns.

Warren Buffett recommended this book alongside Bogle's The Clash of the Cultures in his 2012 letter: 'I also recommend The Clash of the Cultures by Jack Bogle and Laura Rittenhouse's Investing Between the Lines.' For founders, Rittenhouse's framework works in reverse: it's not just an investor tool for evaluating which CEOs to back — it's a self-assessment tool for how a founder's own communications signal to the outside world. The 25 Culture questions test whether a CEO's letter (and by extension, the founder's own public communications) actually matches their behavior. A founder whose investor updates, board decks, and public statements score well on candor is more likely to attract the right kind of long-term investors — and less likely to drift into the earnings-management or spin that Rittenhouse identifies as a red flag.

The book also demonstrates that Buffett's own letters score at the top of Rittenhouse's scale, which is a meta-lesson: the founder who writes to his owners with the same candor he'd demand from a manager is modeling exactly the behavior Rittenhouse's method rewards.