A Systematic Framework for Quality, Momentum, and Risk Discipline
Three Groups. One System. Wealth That Survives.
Most investors do not lose money because they pick bad stocks. They lose because they have no system. The 10-15-30 Portfolio combines academic rigor with real trading discipline: three stock groups, three stop-losses, one method that works in calm markets and in storms.
The System in 60 Seconds
One stop-loss does not fit every stock. The 10-15-30 system sorts your holdings into three groups and gives each the protection it needs.
Up to 30% / SNIPER
The apex, about 10% of capital, with no single position above 1%. Small, high-potential, high-volatility names. Protected with a dynamic stop that widens from 15% to 22% to 30% as the position proves itself.
15% / GROWTH
The engine, about 40% of capital. High-quality companies growing faster than the economy. Protected with a 15% trailing stop.
10% / ANCHOR
The foundation, about 50% of capital. Large, established companies with wide moats and low volatility. Protected with a 10% trailing stop.
The stop only ever moves up, never down. When markets turn, one switch tightens every stop at once. That is the difference between guessing and managing.
Prof. Tchai Tavor
As an Associate Professor of empirical finance and behavioral economics with more than 70 peer-reviewed publications, Tchai Tavor understands the deep mechanics of capital markets. But after more than 15 years as an active investor, he knows what the journals rarely teach: in the real world, theory collides with human psychology, and psychology usually wins.
He built the 10-15-30 Portfolio after learning this the hard way, in his own brokerage account. The lesson was simple and expensive. The difference between a successful investor and a failing one is not raw intelligence. It is discipline. Smart people are often better at rationalizing bad decisions, not worse.
That is why he built The 10-15-30 Pro Tracker on the same system he uses to manage his own capital, designed to do the one thing willpower struggles with: helping you hold to the rules when the market is loud and your instincts are wrong. By systematizing the math, the trailing stops, and the position sizing, it helps you trade your plan instead of your mood. The result is investing as it should be: a quiet, structured, long-term process, not a daily emotional rollercoaster.
What to Buy. When to Buy. When to Sell.
The 10-15-30 Portfolio is a complete investment management system across 24 chapters and six parts, built on three pillars. Fundamental quality tells you what to buy. Technical timing tells you when to buy. Systematic risk management tells you when to sell.
The six parts:
Part I:
Foundations
Part II:
Stock Selection
Part III:
Entry Timing
Part IV:
The System
Part V:
Market Adaptation
Part VI:
Implementation and Mastery
What this book does not promise:
This is not a get-rich-quick scheme. It is not perfect market timing. It is not a guarantee of profits. What it offers is a structure that limits your downside, lets your winners run, and frees you from predicting every move in the market.
How Disciplined Is Your Investment Process?
Take the free two-minute Portfolio Discipline Scorecard and see how consistently your investment decisions follow a structured, rule-based process.
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Upgrade Your Execution. Trade Your Plan, Not Your Mood.
The 10-15-30 framework is only as strong as your discipline. The 10-15-30 Pro Tracker helps you hold to it, every market day.
The 10-15-30 Pro Tracker for Excel. $39, one time. Yours to keep.
See your whole portfolio at a glance.
Illustrative data. Fictional companies.
A built-in summary shows your total invested, your unrealized profit and loss, how many positions are locked versus at risk, and your average result for each group: Anchor, Growth, and Sniper. One screen tells you exactly where you stand.
Know what needs your attention today.
Illustrative data. Fictional companies.
A six-state alert (OK, TIGHTEN, NEAR STOP, STOP HIT, SET STOP, NO PRICE) tells you the exact action for every position, while a green, yellow, and red status shows at a glance whether each holding is LOCKED in profit, at BREAK-EVEN, or still AT RISK.
Never calculate a stop by hand.
Illustrative data. Fictional companies.
The tracker calculates the recommended trailing stop for every position, including the dynamic 15-22-30 Sniper progression shown above, and tells you the moment it is time to raise it. You keep the order with your broker. The stop only ever moves up, never down.
Switch to defense in seconds.
Illustrative data. Fictional companies.
One Market Mode toggle shifts every position from Normal stops (10-15-30) to Tightened stops (8-10-15) when conditions deteriorate, exactly as the book describes. One switch, not fifty manual edits.
What you get:
A ready-to-use Excel workbook built on the exact AGS methodology in the book. Formula-driven with no macros to enable, no subscription, and no login. Download it once and it is yours, licensed for single-user use.
What it is not:
No stock picks. No brokerage integration. No mobile app. No cloud sync. The tracker is a standalone Excel workbook that you control.
Not ready for the Pro Tracker yet? Start with the free Portfolio Discipline Scorecard.
For educational use only. Not investment advice. You will be taken to a secure third-party checkout to complete your purchase and download. All sales are final.
Works in Microsoft Excel on Windows and Mac. Automatic price updates require Microsoft 365 (through the Excel Stocks data type). On Excel 2019 or older, use Manual Price mode and enter prices yourself. Not compatible with Google Sheets, Apple Numbers, or LibreOffice.
Built on Research, Tested in the Market
More than 70 peer-reviewed publications in empirical finance and behavioral economics.
Published in journals including the Journal of Behavioral and Experimental Finance and Economic Change and Restructuring.
More than 15 years as an active investor, running the system with his own capital.
Associate Professor at Max Stern Yezreel Valley College, Israel, in finance and behavioral economics.
faq
Is this financial advice?
No. The Pro Tracker and the book are educational tools that help you apply a defined framework consistently. They do not tell you which stocks to buy or sell, and nothing here is personalized investment advice.
What exactly do I get?
A single Excel workbook that runs the full 10-15-30 system. It calculates the recommended trailing stop for every position, flags exactly what needs attention with a six-state alert system, shows color-coded position status, switches between Normal and Tightened defense with one toggle, and gives you a live summary of your whole portfolio. You place and adjust the actual stops with your broker; the tracker tells you when and to what level. One file, one payment, yours to keep.
What are the technical requirements?
Works in Microsoft Excel on Windows and Mac. With Microsoft 365, you simply enter each ticker and prices are pulled and refreshed automatically. On Excel 2019 or older, use Manual Price mode and enter the prices yourself. Not compatible with Google Sheets, Apple Numbers, or LibreOffice.
Do I need to be an experienced investor?
No. The tracker does the math for you. Reading the book first will help you understand the method behind it, but the tool is built to be used from day one.
What is your refund policy?
The Pro Tracker is a digital product delivered instantly, so all sales are final and no refunds are issued. Please review the features, the technical requirements, and the screenshots on this page before purchasing, and reach out with any question first.
Is my data private?
Yes. The tracker is a file that lives on your own computer. You enter your positions locally, and nothing is uploaded or shared. It is licensed for single-user use.
Ready to Trade Your Plan Instead of Your Mood?
The 10-15-30 Pro Tracker for Excel. $39, one time. Yours to keep.
For educational use only. Not investment advice. You will be taken to a secure third-party checkout to complete your purchase and download. All sales are final.
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