South Korea’s Kospi plunged 6.45% Wednesday from 6,869 to 6,426 points, triggering a sell-side sidecar that paused program trading for five minutes at 9:06 a.m.; chip leaders Samsung and SK Hynix drove the decline with SK Hynix’s U.S. shares down 9.20% to $155.62 and an additional 1.38% after-hours. The rout was exacerbated by rising Brent crude to $91.50 (+0.75%) after a 60-day U.S.-Iran memorandum expired Monday and President Trump ruled out new talks, heightening risk-off sentiment that could spill into broader risk assets including crypto, DeFi and CEX liquidity and slow token adoption.

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In Brief

Kospi fell 6.45% to 6,426 points, triggering a sell-side sidecar Wednesday.
Samsung and SK Hynix led losses as chip stocks tracked Wall Street's slide.
Rising oil prices and bond yields followed Trump's rejection of new Iran talks.

South Korea’s Kospi sank 6.45% Wednesday, from 6,869 to 6,426 points. The Korea Exchange activated a sell-side sidecar for the benchmark in response.

Program trading on Kospi-listed shares was suspended for five minutes at 9:06 a.m. local time. The halt interrupted a rebound that had lifted the index in prior sessions.

Chip Stocks Lead the Sell-Off

A sell-side sidecar triggers automatically when Kospi 200 futures fall 5% or more for one minute. It pauses program sell orders for five minutes, without halting individual stock trading.

Samsung Electronics and SK Hynix, which together drive much of the index’s weighting, led Wednesday’s decline. Investors tracked overnight losses on Wall Street, where chip stocks also sold off.

The sharp falls marks a stall in the Korean index’s rebound. Image Source: Trading View

SK Hynix’s U.S.-listed shares fell 9.20% to $155.62 in Tuesday’s session. The stock slipped another 1.38% in after-hours trading, signaling further pressure into Wednesday.

The drop extends a volatile stretch for Korea’s chip-heavy market. The index had staged a sharp rebound in recent weeks following earlier sidecar and circuit-breaker activations this year.

Oil Prices and Iran Tensions Weigh on Sentiment

Rising oil prices and bond yields added pressure across the region. A 60-day U.S.-Iran memorandum expired Monday without a broader agreement, and President Donald Trump ruled out further talks.

“There are no talks or conversations going on, or scheduled, with the Islamic Republic of Iran.”

Trump made the remark in a Truth Social post Tuesday. He also said the U.S. naval blockade remained in force, even as he described the Strait of Hormuz as open and operating.

The renewed geopolitical standoff has kept oil markets on edge. Brent crude gained 0.75% to $91.50 a barrel Tuesday, adding to inflation worries.

Oil prices are on the rise again. Image Source: Trading Economics

An Iranian official reportedly warned Tehran could shift to a “fully offensive” posture should diplomatic efforts collapse. Back-channel contact reportedly remains possible despite the stalled formal talks.

Japan’s Nikkei 225 also declined Wednesday, falling more than 2%. The chip sell-off spread across Asian markets, with Tokyo names tracking the same overnight U.S. losses.

Wednesday’s sidecar marks another halt in a year already defined by repeated trading curbs. Samsung and SK Hynix now face pressure to stabilize before Thursday’s session.

Read the article at BeInCrypto