From your ledger to plain English.

1. Your holdings stay in Mia Accounting

Mia Invest keeps no copy of your portfolio. Every time you open a page it reads your positions live from Mia Accounting — quantity, cost basis, currency, and the wrapper each one sits in, whether that's an ISA, a SIPP or a plain broker account. Holding the same position in two wrappers is normal and shows as two lines, because that's what it is.

Because there's only ever one copy of the data, there's nothing to import, nothing to refresh, and no chance of the two apps quietly disagreeing about what you own. You edit holdings in Mia Accounting; Mia Invest reflects the change immediately.

2. Symbols get translated, not guessed

Brokers export tickers in their own house style. The same company might arrive as AMD.US from one and AMD from another, and London listings turn up as BP.UK where the market-data provider expects BP.LON. Mia Invest translates between the two.

Where an identifier is genuinely ambiguous, it stops. A bare ticker priced in Australian dollars could list on several exchanges, and picking one would mean showing you the price of a different company. Those holdings are listed as unmatched, with the reason, so you can fix the ticker at source rather than trusting a number that was never right.

3. Prices are cached, not hammered

Quotes and fundamentals come from a market-data provider and are stored once. Opening a page reads the cache and costs nothing; fetching new prices is something you ask for explicitly. That keeps pages quick and keeps the app well inside the data provider's limits.

Not everything can be priced. Workplace pensions, managed portfolios and internal fund codes have no market ticker at all. Rather than dropping them — which would quietly understate what you're worth — Mia Invest falls back to the valuation held in Mia Accounting and marks the position so you know which number you're looking at.

4. Totals are grouped by currency

A portfolio spread across GBP, USD and AUD doesn't have a single total until someone picks an exchange rate. Mia Invest doesn't invent one. Totals are shown per currency, so every figure on the page is one you could check yourself.

5. The signals are arithmetic; the words are Claude

Valuation, momentum, volatility and concentration are computed from cached price history using ordinary, repeatable calculations. Those numbers don't change depending on how a question is phrased.

Claude's role is to read those signals and explain them — what stands out, what's concentrated, what's moved and why that might matter. It explains the measurements; it doesn't produce them. When you disagree with the conclusion, you can go and look at the numbers it was working from.