⚠️ Educational research and a personal trading journal — not investment advice. การศึกษาเท่านั้น ไม่ใช่คำแนะนำการลงทุน. The author does not provide licensed advisory services. A study of a past chart, not a recommendation.
So far in this series I've shown you cup-shaped bases — AMATA, MRVL — where the stock dips and recovers over many weeks. But the same breakout logic works on a much tighter, faster structure that's easy to miss: the flat base, or Darvas box.
It's the tightest version of the same setup. And once you can see it, you'll see it everywhere. Let me show you on MU — a US semiconductor, mid-2025.
What a box looks like A Darvas box — named after Nicolas Darvas, a dancer who made a fortune trading them in the 1950s — is simply a tight sideways range. The stock stops trending and trades in a narrow band for a few weeks, bounded by a ceiling (resistance) and a floor (support).
MU's box (switch to chart): - A high near 99.6 that it kept bumping into — the ceiling, and the pivot. - A low near 92.2 it kept holding — the floor, and the stop. - The whole range only about 8% tall, over roughly three weeks.
That's it. Flat, tight, contained. No deep cup, no long handle. Just a stock coiling sideways.
Why tight is good The tighter the box, the better. A narrow range means the stock has reached a truce — buyers and sellers in tight balance, nobody panicking, volatility compressing. That compression is potential energy. When price finally breaks the ceiling, there's little overhead supply to fight through, and the move can be explosive.
A loose, wide, sloppy range is the opposite — it tells you the stock is still being fought over, indecisive. Tight = coiled. Loose = avoid.
The breakout — same rules as always MU broke above the 99.6 ceiling and closed at about 102.25, on a volume pop. From there it rode higher.
Notice the template is identical to the cup setups, just at maximum tightness: - Pivot = the box ceiling (the recovery-high resistance). - Stop = the box floor (the recent low). Here, ~92.2. - Buy zone = within ~5% above the ceiling. - Volume dries up inside the box, then expands on the break. - Hold = ride the 21-day average; sell at exhaustion or when it loses the handrail.
One nuance worth noting: at the box low, MU had briefly dipped below its 200-day average and then reclaimed it. A "reclaim" base like that is a bit lower-probability than one that stays above the line the whole time — but in the US, on a strong leader, it worked. (In Thailand, my testing says reclaim bases are weaker — apply the read to the market you're in.)
Why this matters for your watchlist Cup bases take weeks to develop and are easy to spot. Boxes are faster and quieter — a strong stock that just goes sideways for three weeks doesn't grab attention, which is exactly why the breakout can surprise. Train your eye to notice when a leader stops moving and tightens into a flat range. That quiet is often the setup forming.
The full family is one idea at different tightness: - Box / flat base — tightest, weeks, lows roughly flat (MU). - Cup — deeper, ascending higher-lows (AMATA, MRVL). Same pivot logic, same stop logic, same hold-and-sell. Learn one, you've learned them all.
The lesson A three-week sideways drift in a market leader isn't boring — it's a spring coiling. The box ceiling is your pivot, the box floor is your stop, and the breakout on volume is your trigger. Don't wait for a dramatic chart; the best setups are often the quiet ones.
Track. Study. Wait. Strike.
Educational case study of a past chart, not advice. The author does not provide licensed advisory services. — MOEasymmetry