Net Interest is a weekly newsletter of insight and analysis from the world of finance. Enjoyed by over 80,000 people from around the world, it casts light on this important sector in an easy-to-read style.

Written by a former analyst and hedge fund manager, Net Interest distils 25+ years of experience in the financial sector into a weekly email. Each post explores a theme currently trending in the sector. And because there’s a financial company lurking inside almost every company, there’s always something to talk about.

For $25/month paid subscribers also receive supplementary comment on breaking issues in the financial sector, full access to the archive of over 180 past issues, and invitations to conference calls with the author. 

About the Author

Net Interest is written by me, Marc Rubinstein. I spent ten years as a partner of an award-winning hedge fund. Before that I was a top-rated analyst at an investment bank. When I’m not writing Net Interest, I consult with corporates and investment firms and I’m also an active angel investor in fintech. You can find out more about me via LinkedIn or Twitter.

What People Are Saying

Net Interest has been quoted in The Times, the Financial Times, Business Insider, Bloomberg and more. It featured in Forbes as one of “Eight New Fintech Newsletters You Should Be Reading”.

Net Interest research has even been cited in UK Parliamentary hearings and by global banking regulators.

This is what readers have to say:

You did a very good job and I was impressed with your effort. It was fun for me to read…
Chairman and CEO, Major Global Bank

“It is always an interesting read.”
CFO, Leading Indian Private Sector Bank

“Thank you for your posts! I really enjoy them, and find them insightful.”
CEO, Global Insurance Company

“Your essays are very, very compelling.”
Former Member of the Management Board, Deutsche Bank

“Definitely worth a read.”
Former Group Head of Strategy, FTSE 100 financial services company

“A fantastic note … one of the best emails I’ve read for some time.”
Director, Hong Kong based investment firm

“Lovely newsletter. It’s clarity of content is rare indeed.”
Head of equity sales, brokerage firm

“Great stuff.”
Senior hedge fund manager

There is always something one can learn from you.
Social entrepreneur

“You really have a gift for writing. Your style is unique and special. It is dense and informationally rich, yet easily digestible—an expert can learn, a novice can still understand. I personally don’t think anyone in financial journalism matches it.”
Investment analyst

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Packy McCormick @packyM
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Marc Rubinstein @MarcRuby
When I launched Net Interest back in May, @packyM was incredibly generous with his advice. An absolute pleasure to be able to collaborate with him on this 👇

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Financial sector insights from a former hedge fund manager with 25+ years experience analysing and investing in the industry.


Former hedge fund manager, now probing the perimeter of my circle of competence.