Chips · Stock report · Sumco (TSE: 3436.T)

Sumco — 79th of 86 chip stocks in a month; its money-flow reading is still positive

October 16, 2026 · data as of October 15, 2026 close · Closelooknet research diary

79 of 86rank in our chip section, 1-month move

125.2our money-flow reading, still positive but slowing

The Closelooknet read

Sumco (TSE: 3436.T) sits 79th of the 86 stocks in our chip section over the past month, yet our money-flow reading (a gauge of net buying pressure) is still positive at 125.2. It is slowing: the reading is down 7.5 over five sessions and 27.8 over 21 sessions, and we label it warm. Our momentum score, on a 0–100 scale, is 33. The stock fell 13.9% on Thursday's session to JPY 2,652.50 and crossed below the average close of the last 200 sessions, JPY 2,781.44. What we watch: whether the money-flow reading keeps sliding from 125.2 and whether the close stays under JPY 2,781.44 or climbs back above it.

The weak rank and the still-positive flow point in different directions, and the next readings will show which one gives way.

Where Sumco stands among our chip stocks

Sumco's one-month move is -13.3%, 79th of 86 in our chip section. Among the peers in the pack, Murata Manufacturing (6981.T) is down 10.3% over the month, Soitec (SOI.PA) 6.9%, Siltronic (WAF.DE) 6.7% and Resonac (4004.T) 6.1%. Entegris (ENTG) is up 12.8%, Shin-Etsu Chemical (4063.T) 3.5% and GlobalWafers (6488.TW) 2.3%.

Sumco is 50.0% below its 52-week closing high of JPY 5,307, set on 14 July. Murata is 44.9% below its June high, GlobalWafers 39.1% below its July high and Siltronic 37.7% below its May high.

Our money-flow and quality readings

Our money-flow reading for Sumco is 125.2 and is labelled warm, our label for the strength of net buying. Its flow is still positive but slowing: it is down 7.5 over five sessions and 27.8 over 21 sessions. Our momentum score, on a 0–100 scale, is 33.

The composite score is not available, so we do not rate Sumco overall.

Price trend

Sumco closed at JPY 2,652.50 after a 13.9% drop, which opened with a 6.2% gap down. The fall was about 2.6 times its typical daily swing of about 5.4%. The close is 4.6% below its 200-day average of JPY 2,781.44 and 20.8% below its 50-day average of JPY 3,347.56. Over three months the stock is down 49.4%, yet it is still up 84.8% year to date and 68.2% over one year. The 52-week low is JPY 1,160, from 19 November 2025.

Closelooknet is a research diary. Nothing here is investment advice or a recommendation to buy or sell.

3436.T — quick answers

Why did Sumco stock fall on 15 October 2026?

The data show a 13.9% drop to JPY 2,652.50 after a 6.2% gap down at the open, one of the day's sharpest falls. It closed below its 200-day average of JPY 2,781.44. We do not have a stated cause.

How does Sumco rank among chip stocks?

In our chip section it is 79th of 86 over the past month, with a one-month move of -13.3%. Our money-flow reading is still positive at 125.2 but slowing.

Is Sumco below its 200-day average?

Yes. It closed at JPY 2,652.50 against a 200-day average, the average close of the last 200 sessions, of JPY 2,781.44, a cross to the downside on 15 October.