The price shown for a stock is not set by anyone — not by the company, not by the exchange, not by a central computer. It is the continuous result of a very concrete mechanism: the order book.
The order book
At every moment, an exchange keeps two lists for each security:
- the buyers, with the maximum price each is willing to pay;
- the sellers, with the minimum price each is willing to accept.
The top of each list forms the two prices that matter: the best buyer (the "bid") and the best seller (the "ask"). When a buyer accepts a seller's price — or the reverse — a trade completes, and that price becomes the "quote" shown. The price is therefore nothing other than the price of the last agreement reached.
Why the price moves with no news
That follows directly from the mechanism: the price changes as soon as the composition of the book changes, and the book changes for a thousand reasons that have nothing to do with company news —
- a large investor rebalances their portfolio and sells, whatever the security;
- a fund receives deposits and has to buy;
- participants adjust their general expectations (interest rates, the economy) with nothing specific to the company;
- on some days, simply fewer buyers are present.
A security can therefore fall on a day when the company announced nothing — and the honest explanation is sometimes: "more sellers than buyers today", nothing more.
A neutral worked example
The book of a fictional security, at a given instant:
- Best buyer: $49.95 for 200 shares.
- Best seller: $50.05 for 150 shares.
- An investor decides to buy 100 shares at the seller's price: the trade completes at $50.05 — the quote shown becomes $50.05.
- No one else acts: the quote STAYS at $50.05, even as hours pass. A quote that does not move means "no trades", not "value confirmed".
What this changes for your tracking
Prices are not yet shown in the app; they will be at launch.
The price shown in Everyfolio is that of the last trade known to the data provider, with its freshness ("Updated: X min ago"). A daily change measures the difference between two completed agreements — not a judgment passed on the company.
Informative, general content — not personalized advice. For your situation: your institution or an advisor.