A 4% day with a sidecar attached is exciting. It isn’t proof. Here’s how I’d separate speed from strength.

1. What the tape says
KOSPI was up 4.28% at 5,790.58 around 11:10 am Seoul time, with SK hynix up about 8% and Samsung about 7–8%. A buy-side sidecar triggered at 10:51 am, the first since August 20. It fires when KOSPI 200 futures rise more than 5% and hold for a minute, and it pauses program buy orders for five minutes. In my view, a sidecar tells you the move was fast, not that it’s sturdy.

2. Where that leaves the index (my math)
Yesterday’s close was about 5,552.74. Today’s level is above last Friday’s 5,668, but still about 3.6% below the roughly 6,009 close before the mid-October crash. The index needs about +3.8% from here to get all of it back.

3. Who’s buying and who isn’t
Foreigners reportedly net bought about 315–320B won on the main board, institutions about 168–180B won, while retail sold roughly 974–980B won, about 3x what foreigners bought (my math). Retail is taking profit into the bounce. In KOSPI 200 futures, institutions were net sellers of about 484B won while individuals bought about 394B won, so the hedging picture is mixed. Foreign flows into chips remain the variable that decides if this lasts.

4. The fundamental cushion
One analyst estimate has Samsung at about 3.5x forward earnings and SK hynix at about 2.8x (single-source). Chip exports are reported up 222.5% year over year, though I couldn’t confirm the period. Cheap multiples explain why dip-buyers showed up. They don’t set a timeline.

5. Chart check (levels from my screenshot)

SK hynix receipts at 139.73: support at 132.39 (-5.3%), 14-day at 165.31 (+18.3%), 21-day at 172.75 (+23.6%), 35-day at 175.38 (+25.5%), resistance at 210.89 (+50.9%). RSI is 31.9, and the MACD histogram is -5.21. The receipts haven’t joined Seoul’s rally yet.
Samsung at 220,000 on my chart: support at 201,653 (-8.3%), 14-day at 242,785 (+10.4%), 21-day at 251,380 (+14.3%), 35-day at 253,885 (+15.4%), resistance at 300,996 (+36.8%). RSI is 36.8, and the MACD histogram is -5,329. This chart price lags Seoul’s intraday move, so treat the levels as structure.

Both are still far below their averages. The bounce has repaired some damage but hasn’t changed the trend.

6. What would make it last
Foreign net buying across several sessions, a constructive US open for the receipts, and a calm October 28 Fed decision. One wire report also flagged worries that high bond yields could slow the borrowing that funds AI chip purchases. That’s the risk that can turn this rally back around.

My take: I’d call this a sharp rebound, not yet a recovery. The sidecar and retail selling both say the move is crowded and fast. I’d need foreign buying to persist and the averages overhead to be reclaimed. Until then I’m not chasing a 4% day.

Not financial advice.

Do you trust a sidecar-day rally, or do you wait for follow-through? And what do you need first: foreign buying or a US-session confirmation?

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