AlphaLens · Journal
Notes on portfolio analytics, risk, and broker integrations
Field notes from the team building AlphaLens — what we learn while wiring up brokers, computing the right metrics, and explaining risk to active traders.
AlphaLens · 2026
analytics
performance
Understanding Time-Weighted Returns
Why time-weighted return (TWR) is the right way to measure portfolio performance, and how AlphaLens calculates it across your Alpaca and IBKR accounts.
Mar 12, 20262 min
ReadAlphaLens · 2026
analytics
performance
Why Your Broker's Return Number Is Misleading
The percentage your broker shows you is almost never your actual return. Here's what it's actually measuring — and what you should look at instead.
Mar 6, 20264 min
ReadAlphaLens · 2026
performance
benchmark
How to Know If You're Actually Beating the Market
Most traders who think they're beating the market aren't. Here's the rigorous way to find out — accounting for risk, cash flows, and benchmark selection.
Feb 13, 20264 min
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