COST's 300 percent return compresses to 14.9 percent a year

COST's total return under ma crossover 20/50 is 300.38 percent, 20 trades over ten years, a 70 percent win rate. Annualized, the identical result reads 14.9125 percent. Both numbers describe the same 20 trades on the same stock over the same decade. One of them sounds like a headline. The other sounds like an ordinary year for a decent strategy, because dividing a large total by ten years does exactly what division does.

What annualizing actually does to a number this size

A 300.38 percent total return compounded evenly across roughly ten years works out to a yearly pace of about 14.9 percent, close enough to what an average stock market year has returned historically that it would not draw a second look on its own. Tenachine's guide on the best per-ticker result backed by a real sample already lists COST's 300.38 percent as the second-largest such result on the site, just behind AMD's 308.45 percent under a different strategy. That guide compares total returns to each other. It does not annualize any of them, and annualizing COST's changes what the number is entitled to claim: not that this strategy found something 300 percent good, but that it found something worth roughly 15 percent a year, for ten years, on one stock.

This is not a new mechanism. Tenachine's guide on Warren Buffett's Mastercard position shows the identical compression on a completely different kind of data, a disclosed 13F trade rather than a backtest: MA's 1125.51 percent total return, held 15.25 years, annualizes to 17.86 percent. A total return large enough to be a headline and an annualized return modest enough to blend in are not in tension. They are the same fact stated two ways, and a long enough holding period will produce that pairing on almost any strategy that actually works, in either kind of data this site publishes.

What the annualized number does not erase

COST's own numbers are still worth reading past the two headline figures. Its win rate is 70 percent, comfortably above ma crossover 20/50's own study-wide win rate, 34.78 percent, meaning COST is an unusually clean result for this strategy rather than a typical one. Its calmar ratio, return divided by max drawdown, is 0.8483, on a max drawdown of negative 17.5785 percent, nowhere near the site's best calmar result, CTVA's 1.35 under a different strategy entirely, but a genuinely solid ratio on its own terms. And buying and holding COST over the same ten years returned 703.7977 percent, more than double what the strategy captured either way it is read, total or annualized. None of that changes because one of the two headline figures happens to look smaller than the other.

Neither figure is more correct than the other, and neither is a signal to trade COST or ma crossover 20/50 specifically. A total return answers what the account ended up with. An annualized return answers what pace that total works out to per year, a question worth asking before comparing a ten-year result against a one-year one, or against an index's own annual average. Read only the total and a strong multi-year result can look like a discovery. Read only the annualized figure and the same result can look unremarkable. Reading both, next to how many years actually produced the gap, is what tells a reader which one they are looking at. Past performance does not predict future results, on this ticker or the next one this strategy runs on.