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Dilution Impact Calculator & Portfolio Tracker

A browser plugin that integrates with brokerage platforms (Fidelity, Charles Schwab, Interactive Brokers) and financial data APIs to automatically flag dilution events (secondary offerings, stock splits, option exercises, warrant conversions) for stocks in a user's portfolio. It calculates real-time ownership % change, voting power impact, and projected return dilution, then surfaces this in a simple dashboard overlay within the brokerage interface itself.

PLUGIN

22 weeks • 70% confidence

Value Proposition

Eliminates the need to manually track dilution across holdings by embedding clarity directly into the tools investors already use daily. Catches dilution events before they're priced in, giving investors 48-72 hours of decision advantage. No separate login or workflow—works passively in background.

Target Audience

Individual retail investors holding 5-50 stocks, primarily on major US brokerages; ages 30-65; net worth $100k-$5M

Key Features

  • Real-time SEC filing scraper that flags 424B5, S-3, and 8-K filings mentioning dilutive events within 2 hours of filing
  • Automated calculation of ownership % impact using current share count vs. pro-forma shares outstanding
  • Voting power impact calculator showing how dilution affects proxy voting influence for concentrated positions
  • And more, with full implementation detail...

Tech Stack

SEC EDGAR API (free) IEX Cloud or Alpha Vantage (share count, float data; $50-200/month) Chrome/Firefox Extension APIs OAuth 2.0 (Fidelity/Schwab login)
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Original Problem

Individual investors struggle to understand and calculate the real impact of stock dilution on their ownership and returns

Individual investors lack clear, practical guidance on how share dilution affects their equity stake, voting power, and investment returns. Current financial resources either oversimplify the concept or bury it in dense academic explanations, leaving retail investors unable to make informed decisions about stock splits, secondary offerings, and option exercises. This knowledge gap causes investors to either ignore dilution risks entirely or make poor portfolio decisions based on incomplete understanding.

Score: 45.3%

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