SPX 5,842.71 +0.41% NDX 20,193.40 +0.62% VIX 14.82 -3.18% DXY 104.21 -0.12% UST10 4.27% +2bp BTC 91,440 +1.82% ETH 3,212 +1.04% GOLD 2,638 -0.34% WTI 71.12 +0.88% EURUSD 1.0581 -0.21% SPX 5,842.71 +0.41% NDX 20,193.40 +0.62% VIX 14.82 -3.18% DXY 104.21 -0.12% UST10 4.27% +2bp BTC 91,440 +1.82% ETH 3,212 +1.04% GOLD 2,638 -0.34% WTI 71.12 +0.88% EURUSD 1.0581 -0.21%

The lab notebook of
a small quant firm.

Dark Stone Capital is a small systematic firm.

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Recent notes

Working notes from the lab — what we built, what broke, and what we learned.

Jul 03, 2026 Notebook 025 — We Sold AAPL, Passed on ARM, and Fixed the Book 6 min Jun 25, 2026 Notebook 024 — We Wiped the Board and Rebuilt ONYX 6 min Jun 21, 2026 Notebook 023-How We're Trading This Week: A Walk Through Strategic Command 9 min Jun 19, 2026 Notebook 022 - Geometry Won the Week 8 min Jun 16, 2026 Notebook 021 - The Lab Graded Itself 7 min Jun 10, 2026 Notebook 020 - Full Auto Bought Nothing 5 min Jun 07, 2026 Notebook 019 - The System Got Smaller 6 min Jun 05, 2026 Notebook 018 - Alerts Are Not Permission 6 min Jun 03, 2026 Notebook 017 - The Plan Stopped Being The Brain 9 min May 29, 2026 Notebook 015 - We Gave the Second Reader Hands 6 min