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Personal finance, investing, and financial literacy.

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Do stocks go up after insiders buy? I tested 47,458 open-market purchases

Do stocks go up after insiders buy? I tested 47,458 open-market purchases

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4 min read
Free Financial Data APIs for Backtesting: An Honest Comparison

Free Financial Data APIs for Backtesting: An Honest Comparison

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8 min read
How much do stocks move after earnings? I measured 12,353 S&P 500 reports

How much do stocks move after earnings? I measured 12,353 S&P 500 reports

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4 min read
How to Integrate SEC Filings into Your AI Agent

How to Integrate SEC Filings into Your AI Agent

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10 min read
When the Name on the Bank Statements Doesn't Match: DBAs, Entity Changes and Bank Statement Loans

When the Name on the Bank Statements Doesn't Match: DBAs, Entity Changes and Bank Statement Loans

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5 min read
How to pull SEC filings, insider trades and XBRL financials into your app in 5 minutes

How to pull SEC filings, insider trades and XBRL financials into your app in 5 minutes

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7 min read
What options price in for MSFT, GOOGL, AMZN and INTC this earnings week, and how last week's five compared

What options price in for MSFT, GOOGL, AMZN and INTC this earnings week, and how last week's five compared

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2 min read
A sales tax payable tie-out in 50 lines of Python, for more than one jurisdiction

A sales tax payable tie-out in 50 lines of Python, for more than one jurisdiction

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5 min read
The Credit Spread of Compute

The Credit Spread of Compute

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3 min read
We tested 17,100 option-selling strategies on SPY and QQQ

We tested 17,100 option-selling strategies on SPY and QQQ

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6 min read
Schedule FA for RSUs & US Shares: The Calendar-Year Rule

Schedule FA for RSUs & US Shares: The Calendar-Year Rule

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6 min read
Floating-point money math: getting compound interest right in the browser

Floating-point money math: getting compound interest right in the browser

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4 min read
Market Analysis: The Transition from AI Speculation to ROI-Driven Realism and its Implications for Digital Asset Vola...

Market Analysis: The Transition from AI Speculation to ROI-Driven Realism and its Implications for Digital Asset Vola...

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3 min read
UK VAT Rates Explained: 20%, 5%, 0% and When Each One Applies

UK VAT Rates Explained: 20%, 5%, 0% and When Each One Applies

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3 min read
AI Finance Agent for SMEs: A Four-Ledger Invoice Control Before Posting

AI Finance Agent for SMEs: A Four-Ledger Invoice Control Before Posting

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21 min read
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