How Often Should You Check Your Portfolio?

The short answer. For a long-term portfolio, a proper review two to four times a year is enough, plus a look whenever something material actually happens to a holding. Daily checking measurably harms returns: it exposes you to noise your strategy has no way to act on, and the research on myopic loss aversion shows frequent evaluation makes people hold fewer shares and sell at worse moments.

Why does checking more often make returns worse?

Benartzi and Thaler's work on myopic loss aversion found that the more frequently investors evaluate a portfolio, the more losses they see — because over short horizons, share prices are close to a coin flip. Losses hurt roughly twice as much as equivalent gains feel good, so someone checking daily accumulates a great deal of psychological pain from movement that is statistically meaningless, and reduces their equity exposure in response.

The mechanism is not weakness. Over one day, an index is close to 50/50. Over a year, positive outcomes have historically been around three times as likely as negative ones. Checking daily is choosing to look at the coin flip instead of the trend.

What should a review actually consist of?

Not "how much is it up". A useful review asks four questions:

1. Has anything changed about the businesses I own? Not the price — the business. Results, competition, management, debt.
2. Are my weights still what I intended? A winner that has doubled is now a bigger bet than you sized.
3. Am I still diversified? Sector drift is silent and fast.
4. Has anything changed about me? Horizon, income, obligations. This one matters more than the other three combined and gets asked least.

When should you look sooner?

• Results, if you hold a meaningful position
• A management change, a large acquisition, or a debt raise
• A thesis-breaking event: the contract lost, the drug failed, the regulator ruled
• A change in your own circumstances

Notice none of these is "the price moved". A price move is information about other people's opinions. It is only a reason to act if it has made something cheap or expensive enough to change what you would do.

Does this apply to everyone?

No. Someone running a short-horizon or momentum strategy has to monitor closely, because their edge is in the movement itself. The advice above is for a portfolio of businesses held for years. Match the frequency to the strategy — the mistake is running a ten-year strategy on a ten-minute review cycle.

What this cannot tell you

Nothing about your own temperament, which is the variable that actually decides the right frequency. Someone who checks quarterly and sleeps is running a better process than someone who checks quarterly and thinks about it hourly in between.

Educational information, not financial advice. Every figure on this page is read from the source filings when the page loads rather than written into the article, so what you are reading is today's data and not a snapshot of the day it was published.