Show HN: A modern alternative to OpenInsider, with more transaction types (13radar.com)

6 points by brokerjames ↗ HN
Hi HN, I've been working on 13radar.com, a site focused on tracking institutional holdings. Today, I’m releasing a beta version of our new Insider Trading Tracker. Like many of you, I've used OpenInsider for years. It's a legendary tool, but the UI hasn't changed in decades, and the data classification can be broad. I wanted to build something that feels modern and digs deeper into the data. How it differs from existing tools (OpenInsider / GuruFocus): Granularity: We parse SEC Form 4 filings to categorize transactions into finer types. Instead of just "Buy/Sell," we try to distinguish specific grants, exercises, and other transactions more clearly than OpenInsider. Data Depth: We are displaying more transaction types than GuruFocus (which often aggregates or hides specific non-open-market actions). Modern UX: Fast filtering, clean mobile support, and a responsive interface. No 1990s table layouts. It's currently in Beta. We are still tuning the parsing logic for edge cases in SEC filings. I'd love to get your feedback on the data accuracy and the UI. Is there a specific filter or transaction type you find missing in other tools that you'd like to see here? https://www.13radar.com/insider/ Thanks!

5 comments

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Congrats on the launch. OpenInsider is legendary but definitely shows its age. Two questions: How does your parsing latency compare to the raw SEC feed? What is the business model? Will this granularity remain free, or is this the lead magnet for a paid pro tier?
The granularity on the transaction types is spot on. It's always been frustrating trying to decipher specific Form 4 footnotes on other platforms. The way you've categorized the specific grant types vs. open market purchases makes the signal-to-noise ratio much better. Keep it up!
Hi HN, OP here. OpenInsider is great and inspired this, we just wanted to modernize the stack. We focused on parsing Form 4s with more granularity (distinguishing grants/options from open market buys) and building a faster, mobile-friendly UI. Would love to hear your feedback on the data accuracy!
Nice work. The finer-grained breakdown of Form 4 transactions (beyond simple buy/sell) is a meaningful improvement over OpenInsider. The UI also feels much more modern and usable. Curious how you’re handling Form 4 edge cases as you iterate on accuracy.