I’m one of the creators of 13Radar.com. We built this tool because parsing raw SEC filings (EDGAR) to track institutional money flows is still surprisingly painful in 2025.
The Problem: Raw 13F/13D filings are messy XML or text tables. They are hard to visualize historically, and it's difficult to see "what changed" between quarters without building your own scraper and normalization layer (handling ticker changes, CUSIP mapping, etc.).
The Solution: 13Radar parses these filings in real-time and visualizes the portfolio structures. We focus on speed and clarity—turning the raw regulatory data into actionable intelligence.
Interesting data from our latest 2025 parse: We just finished processing the latest batch of filings, and the shifts are massive. A few examples visible on the site right now:
1. Bill Ackman (Pershing Square) has completely pivoted. UBER is now his #1 holding (~20% of portfolio), and he has built a massive position in Brookfield (BN). 2. Warren Buffett finally bought Google (GOOGL) in Q3 2025, while slashing his Microsoft position significantly (via the Gates Foundation Trust data). 3. Cathie Wood is back into Alibaba (BABA) and doubling down on crypto infrastructure like Bitmine.
How it works: We ingest the SEC index files, parse the primary document tables, calculate the portfolio weights dynamically, and map them against historical pricing data to estimate entry points.
The site is currently free to use. I’d love to hear your feedback on the data visualization and what other specific metrics (e.g., sector rotation, concentration risk) you would find useful.
Thanks!