📈 LG Innotek, a Day When AI Substrate Hopes Collided with Exchange-Rate Sensitivity - 2026.09.18

Well, well~ Onion’s here. On September 18, expectations for AI substrates and buying by foreign and institutional investors came together for LG Innotek. It was certainly a scene the market could applaud, but the unexpected variable called exchange rates was sitting right beside them. It was a day when expectations and burdens shared the same table.

AI substrate expectations caught fire again 🔥

On September 18, LG Innotek shares rose more than 5% and climbed into the 530,000 KRW range, while an article cited expectations that demand for high-performance semiconductor substrates would increase as investment in AI servers and data centers expands ^[1]. The key point here is that this is an expectation of expanding demand, not actual supply or an announcement of a confirmed business deal.

According to the stock-price data for reference, the September 18 closing price was ₩532,000,, the change was +4.93%, and trading volume was 158,637. After falling as low as the September 14 closing price of ₩506,000, the trend changed from September 15 onward. On September 17, movement paused at ₩512,000, before the stock reacted strongly on September 18. Looking only at the numbers, the market appears to have perked up its ears again at the AI substrate story. But perking up your ears does not mean an order has arrived. That distinction matters quite a bit.

The reaction grew as investor flows joined in 📈

Newspim reported that foreign and institutional investors were both detected as net buyers of LG Innotek during the session on September 18 ^[2]. The simultaneous buying by the two investor groups was added to the catalyst of expected AI substrate demand, apparently amplifying the intraday reaction.

Here’s my take. If only the technology expectations were present, market attention might merely sparkle for a moment. But when investor flows move together, expectations can be reflected in the share price more quickly. Of course, this is an interpretation of that single day’s movement, and there is still insufficient basis to call it sustained buying. Well, well—the market can set a catalyst on fire, but whether firewood keeps coming in is another question.

Exchange-rate sensitivity remains a major variable ☕

On the other side is the exchange rate. Yuanta Securities analyzed that, assuming the volume and product mix remain the same, a 10 KRW exchange-rate movement could affect LG Innotek’s quarterly operating profit by approximately 3,000,000,000 KRW ^[4]. This figure is not a forecast confirmed by the company, but an analysis by a securities firm. It is therefore best viewed as reference material showing the potential sensitivity of earnings to exchange-rate movements.

Another report stated that LG Innotek’s overseas-sales share was 96.2% in the first half of this year, noting that component makers are closely watching exchange-rate fluctuations ^[3]. Placing the high overseas-sales share alongside the exchange-rate impact analysis gives us a clear picture: even as expectations for AI substrates grow, exchange rates remain an important variable in interpreting earnings.

Conditions for the bullish scenario remain to be met 🚀

Onion views this combination of AI substrate expectations and foreign and institutional buying as one scene in a bullish scenario. However, for the bullish case to gain strength, time is needed to confirm whether expectations lead to actual demand and business results. The materials reviewed this time presented expectations for expanding high-performance substrate demand, but did not confirm specific orders or finalized mass-production plans.

Ultimately, LG Innotek’s next points to watch are twofold. How much will expectations of expanded investment in AI servers and data centers translate into demand for high-performance semiconductor substrates? And amid its high overseas-sales share, what burden or impact will exchange-rate movements have on quarterly operating profit? It looks as if AI is pushing the substrate while the exchange rate taps away at a calculator beside it. Which will show up on the next scoreboard: the size of expectations or earnings sensitivity?

📰 Reference News (4)

1

LG Innotek 534,000 KRW, Up 5.33%… Strong on AI Semiconductor Substrate Expectations - JOBPOST

네이버뉴스 · 2026.09.18

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2

[Intraday Flow Watch] LG Innotek, Foreigners/Institutions Net Buy Simultaneously… Share Price +5.33% - Newspim

뉴스핌 · 2026.09.18

📰 View original

3

Even Samsung Electronics and SK Hynix Lowered Earnings Expectations… What Happened to the Electronics Industry as the Exchange Rate Fell

네이버뉴스 · 2026.09.18

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4

Exporters Release Dollars and Expand High-Value Products… Airlines and Refiners Cut Costs

네이버뉴스 · 2026.09.17

📰 View original