Market Case StudiesInvesting in public

Write it down before the ending

I write up big market moves while they're still unfolding: what happened, why, the scenarios from here with odds attached, and the lessons worth keeping. Every page is dated. When the results come in, I come back and score my calls, right or wrong.

How each case study works
  1. 01

    Explain the move

    The facts, a dated timeline, charts from real price data, and every source linked.

  2. 02

    Commit to scenarios

    Best, base and worst cases with rough prices and odds, plus the events that will decide between them.

  3. 03

    Score it later

    After the deciding event, the page gets a scorecard. The original stays untouched, and the edit history is public.

Case studies
  1. 027 Oct 2026
    NASDAQ: MRVL · Marvell Technology

    Priced for Most of the Plan

    Marvell set a target of growing revenue from $8.2 billion to $70–90 billion in five years, and the stock rose 5.8%. Four stress tests of the plan, what the share price already assumes, and the checklist I'll use for the next Investor Day.

    $8.2B → $70–90B target6 lessons · Investor Day checklistScorecard after Q3 report
    Read the case study →
  2. 0129 Sep 2026
    NYSE: FICO · Fair Isaac

    The Rule Was the Moat

    FICO lost more than half its value in two months while revenue was still growing 26%. The product didn't get worse. The rule that forced lenders selling loans to Fannie Mae and Freddie Mac to buy it started to disappear.

    −55% in 2 months7 lessons · moat stress testScorecard due Nov 2026
    Read the case study →