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Personal finance, investing, and financial literacy.

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Why the Same Fundamental Lives Under Different XBRL Tags in SEC EDGAR

Why the Same Fundamental Lives Under Different XBRL Tags in SEC EDGAR

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6 min read
SEC 10-K Filing Deadline Data: The Structural Reason Fundamentals Lag Weeks Behind

SEC 10-K Filing Deadline Data: The Structural Reason Fundamentals Lag Weeks Behind

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4 min read
Neo's Guide: Real-Time Market Data Integration with Trading APIs

Neo's Guide: Real-Time Market Data Integration with Trading APIs

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4 min read
The math of a monthly dividend ETF (QQQI), in TypeScript

The math of a monthly dividend ETF (QQQI), in TypeScript

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3 min read
6 Best Stock Market MCP Servers in 2026: Real-Time & SEC Data

6 Best Stock Market MCP Servers in 2026: Real-Time & SEC Data

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10 min read
I Backtested a Macro Scenario Classifier. The Signal Was Backwards.

I Backtested a Macro Scenario Classifier. The Signal Was Backwards.

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3 min read
Why I Built an Ad-Free SIP Calculator (and How to Handle Clean Math in JavaScript)

Why I Built an Ad-Free SIP Calculator (and How to Handle Clean Math in JavaScript)

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3 min read
Modeling SCHD's dividend growth, in TypeScript

Modeling SCHD's dividend growth, in TypeScript

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3 min read
How to Build a Stock Market Trading Bot in Python: Channeling Your Inner Neo

How to Build a Stock Market Trading Bot in Python: Channeling Your Inner Neo

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5 min read
The Matrix of Machine Learning for Stock Prediction: Separating Hype from Reality

The Matrix of Machine Learning for Stock Prediction: Separating Hype from Reality

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4 min read
Most compound interest calculators get contributions wrong

Most compound interest calculators get contributions wrong

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3 min read
Persistent Memory for a Financial Model: The Six Things That Must Survive a New Session

Persistent Memory for a Financial Model: The Six Things That Must Survive a New Session

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6 min read
We Shipped a 10x Error on General Mills. Here's the Bug, and the Check That Would Have Caught It.

We Shipped a 10x Error on General Mills. Here's the Bug, and the Check That Would Have Caught It.

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5 min read
The cost of a wrong number

The cost of a wrong number

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4 min read
Gamma Scalping: The Complete Guide to Delta-Hedged Straddle P&L

Gamma Scalping: The Complete Guide to Delta-Hedged Straddle P&L

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5 min read
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