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 ### Alternative
 
 - [Adanos Market Sentiment API](https://api.adanos.org/docs/) | `REST API` | - Cross-platform market sentiment API for equities using Reddit, X/Twitter, and Polymarket signals; returns trending tickers, buzz scores, and sentiment snapshots for quant workflows.
+- [13F Insight](https://13finsight.com/?utm_source=github&utm_medium=referral&utm_campaign=seo_outreach_20260422&utm_content=wangzhe3224_awesome-systematic-trading) - AI-powered platform for tracking institutional investor 13F holdings; covers 5,000+ managers with position change alerts, concentration analysis, and quarterly filing summaries. Free tier available.
 - [SEC EDGAR Filing API](https://github.com/janlukasschroeder/sec-api-python)
 - [edgartools](https://github.com/dgunning/edgartools) |`Python`| - SEC EDGAR data for quant strategies — fundamentals, institutional holdings (13F), insider transactions, and corporate events (8-K). Includes MCP server for AI workflows.
 - [CongressionalStockBrain](https://congressionalstockbrain.com) - AI-powered STOCK Act disclosure tracker that converts U.S. lawmaker trade filings into machine-scored signals for retail investors. Alternative data source for equity quant strategies. Free tier available.