Samsung Electronics Closes 1.8% Higher as KOSPI Defies OpenAI Selloff

Lead: Samsung Electronics (005930.KS), Korea's largest semiconductor and consumer-electronics maker, closed up 1.80% at ₩226,000 ($153) on Wednesday, April 29, 2026, even as concerns over OpenAI's growth pulled US semiconductor peers lower the day before. The KOSPI (Korea's benchmark stock index) ended the session at 6,690.9, up 0.75%, marking another record close after recovering from a 0.42% early-morning drop.

What Happened

Samsung Electronics opened at ₩218,500 and rallied to a ₩228,000 intraday high before settling 4,000 won higher than Tuesday's close, a 1.80% gain on volume of 14.52 million shares, according to Minsimnews. Foreign investors were net buyers of 202,757 Samsung shares on the day. The KOSPI ended at 6,690.9 (+0.75%), per Bloomingbit, even though it had been down 27.77 points to 6,613.25 in the first minutes of trading, with the won-dollar rate opening at 1,472.4 won per dollar.

The early weakness mirrored Tuesday's US session, when the Wall Street Journal reported that OpenAI missed its 2025 targets for new users and revenue, and that CFO Sarah Friar had warned colleagues the company may struggle to fund future AI data-center costs if revenue keeps falling short. The report rattled US chip stocks: Micron Technology opened down 4.87% before paring its loss, Nvidia fell about 3% on the day, AMD slid roughly 5%, Broadcom lost about 4% and Marvell Technology dropped near 4%, per intraday and closing market data. The Nasdaq-100 finished 1.01% lower.

In Seoul's pre-market, Samsung Electronics traded down 1.58% and SK Hynix (Korea's number-two memory chipmaker) was off 1.38%, according to Seoul Economic Daily. By 9:03 a.m. KST the KOSPI was off 0.42%, but domestic buying turned the tape green by the close. Foreign investors net sold 151.4 billion won ($103 million) on the KOSPI in early trade, while retail investors net bought 166 billion won ($113 million) and institutions added 13 billion won ($9 million), per Bloomingbit.

Why It Matters

Wednesday's session was the first concrete signal that Korea's AI memory rally has built enough domestic conviction to absorb a US-led chip-sector correction rather than mechanically tracking it lower. For most of the past year, KOSPI semiconductor leadership traded as a high-beta proxy for the US AI infrastructure trade. The decoupling on April 29 — Samsung up 1.80% in Seoul while Nvidia, Micron and AMD were sharply lower the prior session in New York — challenges the consensus that Korean chip names cannot rerate independently of US peers when the AI capex narrative comes under pressure.

It also suggests that Korean investors are reading the WSJ's OpenAI revenue-miss story as a single-customer concern rather than an AI-cycle inflection, since hyperscaler demand for HBM (high-bandwidth memory) flows from multiple sources, including Alphabet, Microsoft, Meta and Amazon.

Business Impact

The 1.80% gain pushed Samsung back toward the ₩228,000 area it had tested earlier this week. SK Hynix closed Tuesday at ₩1,300,000 ($883), up 0.62%, according to Digital Today, which also recorded the KOSPI's first-ever close above 6,600 at 6,641.02 (+0.39%) on April 28. Both names anchor the foreign HBM thesis on Korean equities. The won opening at 1,472.4 per dollar on Wednesday, slightly stronger than recent levels, was a modest tailwind for foreign-buyer math on Korean blue chips, per Bloomingbit.

Focus now shifts to first-quarter results from Alphabet, Microsoft and Meta, which will reveal whether hyperscaler spending and AI monetization are tracking consensus. Han Ji-young, an analyst at Kiwoom Securities (Korean brokerage), told Seoul Economic Daily that "the quarterly earnings of Microsoft, Amazon, and Meta…and capex changes" will set the tone for the AI value chain.

Industry & Historical Context

The KOSPI's run to 6,690.9 caps a year-to-date surge of more than 50%, led by memory-chip leadership. Goldman Sachs has lifted its KOSPI target to 8,000 from 7,000 and JPMorgan Chase has signaled potential upside toward 7,500 within the year, per BigGo Finance summarizing recent broker notes.

Tuesday's US selloff came after the Philadelphia Semiconductor Index's 18 straight winning sessions, the longest such streak on record, per GuruFocus and Ainvest reporting around the April 28 pullback. OpenAI publicly called the WSJ report "ridiculous," per CNBC, but US chip investors took profits anyway. Wednesday's Seoul tape suggests Korean investors stayed put.

What to Watch

• Big-tech earnings: Alphabet, Microsoft and Meta first-quarter releases, with capex and AI monetization commentary the most-watched lines, per Kiwoom's Han.
• Foreign flows on KOSPI: Whether foreign net selling reverses after Samsung reclaimed momentum on April 29.
• HBM order signals: Updates on hyperscaler memory orders that confirm or refute the OpenAI-specific framing of Tuesday's selloff.
• Won-dollar rate: Sustained moves below ₩1,470 would extend the currency tailwind for foreign buyers.

Sources: - Maeil Business Newspaper — https://www.mk.co.kr/news/stock/12031282 - Minsimnews — https://www.minsimnews.com/news/articleView.html?idxno=43157 - Bloomingbit (KOSPI early-session report) — https://en.bloomingbit.io/feed/news/111004 - Seoul Economic Daily (Samsung / SK Hynix pre-market) — https://en.sedaily.com/finance/2026/04/29/samsung-sk-hynix-slide-2-percent-on-openai-concerns-pre - Digital Today (KOSPI 6,600 close) — https://www.digitaltoday.co.kr/en/view/51568/kospi-sets-above-6600-for-first-time-closes-at-record-high-for-second-straight-day - CNBC (OpenAI report and chip-stock declines) — https://www.cnbc.com/2026/04/28/openai-reportedly-missed-revenue-targets-shares-of-oracle-and-these-chip-stocks-are-falling.html - GuruFocus (SOX 18-day record streak) — https://www.gurufocus.com/news/8817852/semiconductor-surge-sox-index-hits-record-18day-climb - Ainvest (SOX streak ending April 28) — https://www.ainvest.com/news/chip-stock-winning-streak-jeopardy-phlx-semiconductor-index-1-7-2604/ - BigGo Finance (broker targets) — https://finance.biggo.com/news/IehWsJ0Bh5an-7Gh7mVl

By LineVest Markets Desk — April 29, 2026 This article is for informational purposes only and does not constitute investment advice.