I'm Fabio Brina — founder of Zyberno.com and author of the Brina Gap: a systematic framework for identifying growth mispricing in equity markets. 18 years in markets, managing my own portfolio and guiding clients through investment decisions. Built for the long run.
A framework for identifying equity mispricing by comparing two independently derived growth rate estimates — what the business can structurally deliver, versus what the market price implies it will.
Traditional valuation anchors in the past. Price-to-earnings ratios, earnings yield, and historical DCF models all rely on demonstrated performance. But markets price the future. The result is a systematic blind spot: a stock can look cheap relative to history while the market has already correctly identified deteriorating economics — or look expensive while the market persistently underestimates a compounding machine.
The two estimates are structurally independent: gf is derived entirely from financial statements, with no reference to price. g* is derived entirely from the current enterprise value, with no reference to capital efficiency. Their comparison is non-circular and informationally additive.
Backtested across 15 companies and 86 company-year observations spanning 2015–2025 — covering technology, consumer staples, industrial distribution, semiconductors, SaaS, and payments networks. The Double Discount quadrant achieves a 75% directional hit rate on confirmed cases.
Two independent signals. The Margin of Safety tells you if the stock is cheap relative to what the business has historically generated for owners — it reads the past. The Market Gap tells you if the market is underestimating what the business is capable of going forward — it reads present capital economics against what the current price implies about the future.
When both point positive simultaneously — DOUBLE DISCOUNT — the market is wrong on two independent dimensions at once. That is rare and significant. The most dangerous scenario is a VALUE TRAP: appears cheap historically, but the Market Gap reveals the market has already priced in the deterioration.
This matrix is live on every stock report at Zyberno.com, calculated in real time from company filings.
Zyberno was built to close this gap. Founded in 2025, it gives individual investors access to the same analytical frameworks used by institutional professionals — at a price that reflects Main Street budgets, with guidance built in at every step.
Every tool in the platform came directly from real challenges encountered in years of advisory work: clients who knew what they wanted to analyse, but lacked the tools to do it effectively. Every tooltip, every built-in strategy, every calculation reflects a real question from a real investor.
The methodologies are transparent, the data is pulled directly from company financial statements and regulatory filings — not third-party aggregators — and every metric is explained in plain language. Because a tool you can't understand is just expensive guesswork.
I saw the same problem with every client: they knew what they wanted to analyse. They just didn't have the right tools to do it.
I spent six years working directly with individual and institutional clients on investment decisions — and another twelve managing my own portfolio, with consistently strong returns on both fronts. The work was rewarding — but the constraint was constant. Professional-grade tools were either too expensive for individual investors, or too complex to use without extensive financial training. Free alternatives cut corners on accuracy. The gap between what professionals used and what everyone else could access was enormous — and nobody seemed to be building a bridge.
In parallel, I'd been managing my own portfolio for over twelve years. That experience gave me a different vantage point: I wasn't just advising on investments, I was making them with my own money. Every framework I built, every tool I designed, was one I was using myself. That creates a different standard.
"Rule No. 1: Never lose money. Rule No. 2: Never forget rule No. 1."
— Warren Buffett / The philosophy that guides everything at Zyberno
The Brina Gap working paper came from a different frustration: the realization that most equity valuation is anchored in the wrong direction. It looks backward — at what a business has done — when markets price what they expect a business will do. The framework I built compares those two things directly, without circular dependency, and produces a forward-looking mispricing signal.
Both Zyberno and the Brina Gap paper come from the same place: a conviction that rigor, transparency, and accessibility don't have to be in tension. You can have institutional-quality analysis that's also affordable, explainable, and actionable. That's the gap I'm closing.