Book · 1991
Margin of Safety
by Seth A. Klarman
Seth Klarman's out-of-print value investing manual: the book r/investing drops by name whenever a stock gets kicked out of the S&P 500.
What does Reddit think of Margin of Safety?
Five mentions across 7 years, all from r/investing, all from 2019 and 2020. That's a thin dataset, but the pattern inside it is telling. Three of the five appearances are reading-list drops — the kind of thread where someone asks what books a new investor should own and a commenter with 57 upvotes reaches for Klarman to explain a PCG delisting. That ↑57 comment is the defining data point here: it treats Margin of Safety not as a book to explain but as a shared reference, the way you cite a dictionary. The ↑35 and ↑31 list mentions slot it alongside Graham and behavioral finance texts, which is about right. Nobody on r/investing argues with it; they argue about whether they can find a copy. The consensus, such as it is: canonical status, low availability, and a community that uses it as shorthand rather than a recommendation.
Community feedback & reader fit
Themes
- · value investing principles
- · margin of safety as a risk framework
- · distressed and special-situation investing
- · investor psychology and discipline
- · scarcity and collectibility
Common praise
- + r/investing commenters invoke it to explain real market events without summarizing it, which is how you know it landed.
- + The ↑57 comment uses it to frame the PCG S&P 500 ejection — Klarman's framing transferred directly to a live news item.
- + Reading-list curators rank it alongside Graham's Intelligent Investor, which is not a slot given casually.
Common criticism
- − The book's out-of-print status means most r/investing mentions are about sourcing a copy, not about the content.
- − With only 5 total mentions and no scored sentiment, there's no Reddit evidence yet of anyone working through it critically.
Who it's for
You already know Graham, you've read at least one Buffett biography, and you want the practitioner's version of what margin of safety actually looks like in a portfolio. If you find a copy at a non-absurd price, buy it. The r/investing reading lists that include it treat it as terminal — the book you put at the end of a curriculum, not the beginning. Momentum investors and passive-fund adherents will find nothing here.
Mentions over time
Top subreddits
Which Reddit comments matter for Margin of Safety?
Top-upvoted quotes across the subreddits where this book is mentioned. Click through to read the full thread.
“PCG is getting kicked out of the S&P 500. Wow, the irony. This is exactly the kind of situation that Klarman talked about in his seminal book *Margin of Safety*.
“The Four I recommend the most, but read all of them info you have the time and motivation. Financial Statements: Thomas R Ittelson - Good primer for learning how financial statements are constructed and getting around them. Modern Value Investing: Sven Carlin - Essentially my entire investment st…
“Don’t follow anyone. Read some books instead. Here’s a list to get him started: **Behavioral/Psychology** - Influence: The Psychology of Persuasion by Robert Cialdini - Hare Brain, Tortoise Mind by Guy Clayton - What it Takes: Seven Secrets of Success from the World's Greatest Professional Firms by…
“read books. a good book can go into far more detail than the best online resources. a few I've particularly enjoyed, with some rambling commentary because I'm stuck at home: - The Intelligent Investor by Benjamin Graham. somewhat dated but historically important and still has good advice. Graham p…
“*Margin of Safety* by Seth Klarman
Convinced? Pick up Margin of Safety
What else does r/investing read?
Other books mentioned in the same sub, ranked. Shared-sub overlap with this title breaks ties.
The Intelligent Investor
Benjamin Graham
Benjamin Graham's 1949 framework for distinguishing investment from speculation, cited 100 times on Reddit by people still arguing whether it applies to today's markets.
The Simple Path to Wealth
JL Collins
A retired fund manager distills 40 years of index investing into one rule: buy VTSAX, ignore the noise, and wait.
A Random Walk Down Wall Street
Burton G. Malkiel
Burton Malkiel's 50-year argument that you can't beat the market, backed by data, and Reddit's most-cited reason to stop stock-picking.
The Little Book of Common Sense Investing
John C. Bogle
John Bogle's case for index funds in 200 pages: own the whole market, pay almost nothing, and wait — cited 262 times on Reddit and counting.
Rich Dad Poor Dad
Robert T. Kiyosaki
Tracked Reddit references and selected source excerpts for Rich Dad Poor Dad.
The Psychology of Money
Morgan Housel
Morgan Housel paid off a 3% mortgage early and calls it his best money decision ever — 209 Reddit mentions say the paradox is the whole point.
Margin of Safety — frequently asked
What does Reddit actually say about Margin of Safety?+
Mostly, that it exists. All 5 Reddit mentions live in r/investing, concentrated in 2019 and 2020. The ↑57 top comment invokes it to contextualize the PCG S&P 500 delisting — treating it as a known reference rather than explaining it. No one argues against the content; the conversation is almost entirely about acquiring it.
Is Margin of Safety worth the secondhand price?+
Depends on what you're paying. r/investing reading lists place it alongside Graham and behavioral finance staples, which implies real content value. But 5 mentions across 7 years means Reddit hasn't generated a large enough sample to validate the premium. The scarcity has probably inflated its reputation as much as its price.
Who should read Margin of Safety first — Klarman or Graham?+
Graham first. The ↑35 and ↑31 reading-list comments in r/investing both position Margin of Safety after foundational texts, not before them. Klarman assumes you already have the Graham vocabulary; the book functions as an extension, not an introduction.
Is Margin of Safety still relevant in 2026?+
The r/investing data ends at 2020, so there's no recent Reddit signal to answer this cleanly. The ↑57 comment applied it to a 2019 delisting event without caveat, which suggests the framework still maps onto live situations. Whether Klarman's specific asset-class examples hold up is a different question the data doesn't reach.