My premise has always been that there are only a handful of factors that matter for a particular stock. The 3rd or 5th most relevant factor is exponentially more important than the 20th most relevant factor. If you can nail the key factors within a short time frame, additional effort is not necessary. Said differently, if I can’t figure it out in 1-2 days then what good will 10-20 days be?
There is also an element of, “This is obviously a good idea based on X, Y and Z with no major offsets to those” as opposed to “I talked myself into this after spending a huge amount of time researching.” The only times I have lost money in the stock market are where I convince myself some convoluted situation is good or true. There are thousands of stocks, why ever go for something convoluted? I always hear people say stuff like, “This might be a fraud but it’s so cheap, I have to buy some…” Wait, whaaat? No, don’t buy that.
There are also additive learning benefits from looking at many stocks – you learn more and you learn in a non-linear way. The learning compounds faster, and you can amortize that effort: “I passed at X but now it’s X-30%, this could be really interesting now.” Then you can dust it off quickly.
By covering a lot of ground quickly and taking small, fast positions in high probability winners, you can also structure a low risk (diversified) and low volatility book while maintaining the upside characteristics of most concentrated portfolios. The best performing portfolios will always be very concentrated, but so will the worst performing portfolios. In order to win, you must first not lose. Compounding takes care of the rest.
In terms of position exits, I will sell if the reason I own it changes adversely. I will sell if it hits some estimate of fair value, and I’ll sell if it looks like the upward move is running out of steam based on the fundamentals. Really strong performers usually overshoot fair value, so no need to sell immediately if it’s ripping. Because the positions are small, I am fine holding them for long periods of time, several years if necessary. Obviously anyone would prefer to be immediately right, but that’s not required as long as I am ultimately right within roughly 2-3 years. If I’m running a concentrated book, I need to be right immediately. If the position goes against me, I have to sell or cover to avoid blowing up my year. The diversification is the stop loss – even if one goes to zero, it’s 1% of capital or less.
The strategy is more of a value harvesting approach. It’s not about being smarter than other people, it’s about finding mispriced stocks on a multi-year time period, harvesting the inefficiencies, and then waiting. It requires excellent sourcing, good judgment and time efficiency.
On AGYS, it took me about an hour to figure it out. I bought some stock. I spent the next 1-2 days researching it in depth, talked to the company, bought more. My good friend also owns the stock. He runs a book of 12 stocks and spent two months researching it. He will make more money on it, but will he make more money on a time efficient basis? What if we had both been wrong? Then he would have lost a lot more money or had a much higher opportunity cost.
This only makes sense for a professional money manager, not for a PA, but it makes a lot of sense in the right context.