Build a repeatable investing process for quality stocks.
Portfolio System Lab helps busy DIY investors research, value, and manage long-term stock portfolios with clear frameworks—so decisions feel calmer and more consistent.
What you’ll get
- A Quality Scorecard to filter for durable businesses
- A 1-page Thesis Template to make every decision traceable
- Portfolio rules for sizing, trims, and review cadence
Educational content only. Not investment advice.
The Compounder Toolkit (free)
Download the templates to research a stock in under 60 minutes.
Inside the toolkit
- Quality Compounder Scorecard (100 points)
- 1-page Stock Thesis Template (with kill criteria)
- Valuation Range Template (Low / Mid / High + margin of safety)
- Portfolio Rules Card (position sizing + sell/trim rules)
How it works
1) Filter for quality
Use the scorecard to separate durable businesses from stories.
2) Write a thesis you can defend
Capture the moat, growth engine, risks, and kill criteria in one page.
3) Manage with rules
Position sizing, exposure caps, trim/sell rules, and a review cadence you can stick to.
Who it’s for (and who it’s not)
For you if you want
A calm, long-term approach and a repeatable process for researching quality stocks.
- Clear checklists and templates
- Valuation ranges + margin of safety
- Portfolio rules that reduce decision stress
Not for you if you want
Constant action, hot takes, or “do this trade” style content.
- Day trading or momentum chasing
- Signals or copy-trading
- Guaranteed returns or performance promises
Start here
Follow the framework in order: scorecard → thesis → valuation range → portfolio rules.
About
Portfolio System Lab exists to help investors replace guesswork with a repeatable framework—scorecards, theses, valuation ranges, and portfolio rules—so you can invest with clarity over years, not weeks.
Founder: [Cenk Yildiran] (replace this when ready)