Why I Started Building a Portfolio Tracker
Like many investors, I tried several portfolio tracking tools over the years. Most of them did a decent job, but I always found myself missing somethi…
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QuantConnect Review: Running 2,400 Backtests Without Installing a Single Python Library
Two years, 2,400+ backtests, and one accidentally profitable strategy — here's what actually happens when a developer tries to become a quant. I first…
Alpha Vantage vs Yahoo Finance API: Free Market Data for Side Projects — An Honest Comparison
Eight projects, 600,000 API calls, and one production outage on a Sunday night — here's what you actually get from the two most popular free financial…
Portfolio Rebalancing Tools for the Hands-On Investor
I have a spreadsheet that tells me exactly which positions are off-target by how many dollars. It took thirty minutes to build and it works — but I st…
Why Your Backtest Is Lying to You: Data Biases That Ruin Equity Research
You built a backtest. It returns 18% annualized over the last decade. The Sharpe is 1.4. The drawdown is acceptable. You're already mentally apartment…
SEC EDGAR for Developers: The Free Fundamentals API Hiding in Plain Sight
You finished the comparison shopping between Polygon and Alpha Vantage, maybe even signed up for a free tier of each. Now you want to pull fundamental…
NVIDIA Q1 FY2027 Earnings Preview — 5 Signals the Market May Be Missing
NVIDIA reports Q1 FY2027 earnings on May 20, 2026 , after market close. The consensus expects approximately $78.1-78.8 billion in revenue and $1.74 EP…
How I automated stop-loss monitoring with Claude Code and Telegram (no broker API needed)
The problem with manual stop-loss monitoring: you check your phone, the market moves while you're not watching, and you exit a position three points b…
XLI Put/Call Hit 5.32 While SPY Was at 0.44 — My Claude Scanner Caught It Live
XLI Put/Call Hit 5.32 While SPY Was at 0.44 — My Claude Scanner Caught It Live Most retail traders watch individual stocks. They'll track the put/call…
I Built a Privacy-First Calculator Platform With Zero Tracking — Here's the Architecture
` Every financial calculator website I've used tracks you. Calculator.net, Omni Calculator, Mathway — they all collect your inputs, profile your behav…
Mitsui & Co. (TSE: 8031): First ¥1 Trillion Profit — And the Stock Is Down 10% From Its Peak
Record earnings. A 9% Berkshire stake. 9x forward earnings. The LNG and iron ore thesis — and the two risks that could break it. Mitsui & Co. did …
Mitsubishi Corporation (TSE: 8058): Why Buffett's Biggest Japanese Bet Keeps Getting Bigger
¥1.17 Trillion in annual profit. Japan's largest corporate buyback. A 9% Berkshire Hathaway stake. And yet the stock trades at 10 times earnings. Ther…