Using data to uncover trends in disclosure and reporting.
| Platform |  | Pricing | Freemium | Publishes | Twice weekly |
|---|---|---|---|---|---|
| Issues | 129 | Founded | 3 years ago | Last Issue | 3 days ago |
| Active | |||||
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deepquarry.substack.comLatest Issues
Anthropic’s S-1: We’re not quite there yet
This is collaborative effort, co-authored with The Dig the newsletter from Francine McKenna. If you value our work, please subscribe!
Deep Quarry is a reader-supported publication. To receive new posts and support my work, consider becomin...
SpaceX Q3 Earnings: The Accounting Behind the Numbers
A closer look at unrealized investment gains, tax valuation allowance releases, and the accounting choices SpaceX shares with Tesla.
SpaceX’s third-quarter 2026 results attracted considerable media attention. The company reported its first...
Red Flags in Amended Annual Reports — Quarterly Update #12
Amended annual reports deserve investors' attention because they often deliver bad news.
A quick note before getting into this quarter’s 10-K/A trends. Thank you to everyone who has subscribed to Deep Quarry, and a special welcome to the m...
Reality Check: What can and can’t be said about revenues at OpenAI and Anthropic
Our deepest dive yet into revenue recognition issues for OpenAI and Anthropic.
This is collaborative effort, co-authored with The Dig the newsletter from Francine McKenna. If you value our work, please subscribe!
Between the Headlines and Numbers: AI Costs, Skepticism, and SEC Comment Letters
Before getting into the topics, let me welcome the new subscribers, many of whom found this newsletter through my recent AI coverage. AI-related accounting and disclosure issues will remain an important focus of my work. My friend and frequ...
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Authors
The writers behind this newsletter.
Olga Usvyatsky is a former VP of Research of Audit Analytics, where she led the development of new data sets used by investors, regulators, and academics. Her work was frequently cited by media, including WSJ, Bloomberg, and MarketWatch.
Francine McKenna writes, teaches, and speaks about audit, accounting and public company governance.
Free reports and deep dives on corporate credit, from AI agents that research the thousands of filings no one has time to read. See trends across the whole market, not only the names you follow. None of this is the AI slop you're used to seeing.
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