How the valuation of a position is updated
The valuation on your position moves on events at the company, not on a schedule — and it is not a price at which you can sell.
The short answer
The valuation shown against a position changes when something happens at the company that prices it — a new priced round, a tender offer, a reported secondary transaction. Between those events it does not move, because nothing has repriced it. It is a carrying valuation, not a quote. It is not a price at which you can sell, and a rise in it is not a realised gain.
The events that move a valuation
A new priced round at the company — the strongest signal, because real money changed hands at a negotiated price. A tender offer, where the company buys shares back from employees at a price it sets and publishes. Reported secondary transactions between investors, where the data is available and credible. A revaluation of the vehicle’s holding in the course of its own reporting. Each figure carries the source it came from and the date it refers to.
Why there is no monthly mark
A listed share is repriced continuously because buyers and sellers meet continuously. A private company has no such mechanism: between one priced event and the next, nothing has happened that anyone can point at to justify a different number. A platform could still produce a monthly figure by modelling one — applying a sector index, a comparable-company multiple or a discount curve to the last round. That is a common practice and it is not the one used here, because the output looks like a measurement and is in fact an assumption.
What a number on a private position can and cannot tell you
It can tell you What the most recent transaction implied about the company, and on what date. It cannot tell you What a buyer would pay for your interest today. There is no continuous market and no obligation on anyone to transact. It is not A realised return. Nothing is realised until the vehicle sells and distributes. Valuations can fall as well as rise. A round priced below the previous one — a down round — is a normal event in private markets and re-prices every holder, including the vehicle you are in.