Tommi Johnsen, PhD
Tommi Johnsen, PhD, Svetlana Shasharina, PHDHead of Fin dept at DU, crunched #s w/quants, helped money managers sleep (slightly) better. Now writing about markets, models, & messes.
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 61 | Founded | a year ago | Last Issue | 7 days ago |
| Active | |||||
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tommijohnsen.substack.comLatest Issues
Does AI Still Read the News Better Than the Market?
The short version
A well-known finance paper showed that an AI model could read a news headline about a company and say, better than chance, which way the stock would move. The same paper predicted the effect would fade as more traders...
The Mechanism Survives, the Magnitude Doesn’t
Tommi Johnsen and Svetlana Shasharina
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Abstract
Here is the thesis, stated before the evidence: when we re-measured seven months of work on a pipeline tha...
How We Tried to Teach Claude to Read Like an Analyst, and the Market Said No
Here is a thing that turns out to be true: two thoughtful humans can look at the same piece of financial news, both decide it is good news, agree with each other, and both be wrong in exactly the same way. Not wrong about the news. Wrong ab...
News and earnings sentiment agree, mostly at the extremes
This is a very preliminary result (snapshot June 15, 2026) It rests on 21 earnings events from a single three-week window, and every number below should be read as a first sighting, not a finding. We are publishing it now to describe a patt...
When the insiders and the news disagree: a first look at the cross-signal
When the insiders and the news disagree: a first look at the cross-signal
Tommi Johnsen and Svetlana Shasharina
What this is about
Two different sources each tell you something about where a stock is going. The first is insider trad...
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Authors
The writers behind this newsletter.
Head of Fin dept at DU, crunched #s w/quants, helped money managers sleep (slightly) better. Now writing about markets, models, & messes.
A physicist, yogi being.
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