A trading technology firm, not a fund.
Castle Capital LLC is a Minnesota quantitative trading technology company. We write systematic equity strategies and run the automation that executes them.
Your capital stays in your own brokerage account at Alpaca Securities LLC. We never take custody of it, and we place no trade a strategy has not defined in advance.
How the strategies workFirm record
Mandate
Give individual investors the systematic methods institutions use, without accreditation or million-dollar minimums. Strategies are written as explicit rules, evaluated on a fixed schedule, and executed the same way every trading day — which is what removes emotion from the decision, not a claim about returns.
A platform where an investor can read exactly what a strategy will do before it does it, watch it execute in a brokerage account they control, and disconnect at any time. Transparency is the product; the automation is how it is delivered.
Operating principles
Every strategy is defined as code and evaluated against market data on a schedule. No discretionary overrides, no manual entries, no exceptions made on a bad day.
Position limits and drawdown constraints are part of the strategy definition itself, not a control applied afterwards. Capital preservation is the first constraint, not the last.
Funds never move to Castle Capital. We hold API permission to place orders on the account you connect, and nothing beyond it. Revoke the keys and the automation stops.
Every order, fill, and rebalance appears in your own Alpaca account as it happens. Nothing about how your money is executed is visible only to us.
Questions before you connect an account?
We answer directly — how a strategy is defined, how execution is handled, and what happens to your positions if you disconnect.