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Fintech Newsletter

Net Interest

Marc Rubinstein

Substack Weekly

Financial sector insights from a former hedge fund manager with 25+ years experience. Deep dives on banking, lending, and financial markets.

Recently covered

The newsletter has covered topics related to financial institutions and market structures, including pieces on Guggenheim, organizational strategy, and company size dynamics. Recent issues have also addressed emerging financial sectors and instruments, such as artificial intelligence financing, options trading, and transfer markets.

As of Aug 29, 2026 · AI-generated summary

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Listed since Apr 24, 2026 · Last verified Sep 1, 2026