💼 Samsung SDI, Checking the Hidden Risks Behind the AI Data Center Rally 📉 - 2026.06.19

Hello, subscribers. This is Peanut from Bultagi.com. While the market is hot recently, our portfolio's leading secondary battery stock, Samsung SDI, also made a big move after a long time. Based on the closing price on the 19th, it recorded 550,000 won, a fluctuation rate of +5.36%, and a trading volume of 805,186 shares. Foreigners net bought 45.23 billion won and institutions 698 million won, so the supply and demand weren't bad ^[3]. The securities industry is picking it as a top pick due to the expansion of AI infrastructure investment and changes in battery form factors ^[1], but is this upward trend fully explained by fundamentals? It's a time to question.

💼 AI Data Centers and Prismatic Batteries, A New Narrative? 📉

The core logic cheering the market seems clear. It's the increasing demand for Uninterruptible Power Supplies (UPS) and Battery Backup Units (BBU) for AI data centers ^[1]. There is analysis that they are solidifying their position in the high-margin specialized market to the extent that an Amazon Web Services (AWS) executive visited Korea for a meeting ^[7]. Given the nature of data centers sensitive to fire risks, stability is prioritized over price, so I wonder if Samsung SDI's strategy of sticking to conservative capital expenditures is finally shining.

In addition, the fact that global automakers and Tesla's Energy Storage System (ESS) are shifting to prismatic batteries is acting as a favorable factor ^[1]. With P6 prismatic batteries being installed in new Hyundai and Kia electric vehicles, and expectations of a turnaround to surplus in the second half adding up, positive analyses are pouring out ^[2]. However, we need to pause and think here. Hasn't all this expectation already been pre-reflected in the stock price?

⚠️ Margin Trading Restrictions and Top Investors' Exit, Vigilance is Needed 🛑

Presenting a bearish scenario once even in a bullish atmosphere is essential. As the price rises, warning lights are already flashing behind the market. On the 19th, Mirae Asset Securities downgraded Samsung SDI to an F grade, which is restricted from margin trading ^[4]. As the overall KOSPI showed signs of overheating, they started to tighten debt-driven investments ^[5]. If the buying trend utilizing leverage is blocked, there is a risk that the short-term supply and demand momentum will weaken.

What's more interesting is the movement of the top 1% super-expert investors in terms of return. During the trading hours on the 19th, these experts engaged in profit-taking, placing Samsung SDI as the number one net sold stock ^[2]. It means that even while net buying by foreigners and institutions flows in, smart money is reducing its portion by taking advantage of the short-term price rebound ^[6]. Until the fundamental improvement is actually stamped in numbers, we cannot rule out the possibility that hasty chase buying will act as a value trap.

💼 Peanut's Perspective 📉

From the perspective of a short-to-medium term swing, the current section is a place where expectations and risks are tightly balanced. Expanding the sales portion of data center BBUs and ESS is positive, but I want to ask if it is verifiable that past utilization rate drop issues have been completely resolved, rather than feeling relieved just because valuation indicators like PER or EV/EBITDA look attractive.

Peanut sees that while Samsung SDI may build fundamental strength in the long term based on solid financial stability, in the short term, there is room for it to be classified as a candidate for profit-taking trimming. It is time to coldly weigh the earnings visibility hidden behind the flashy narrative. I hope you maintain a conservative approach until the next quarter's earnings release and do not get swept away by the market's excitement.

📰 Reference News (6)

1

Samsung SDI Surges 6.32% at Close... Why Analysts Name It a 'Top Pick' [Jjinconomy] - v.daum.net

v.daum.net · 2026.06.19

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2

'Top 1%' Scooping Up '370K Samsung Elec'... Betting on Chip & Power Stocks Toward 10K Points [Stock Masters Now]

네이버뉴스 · 2026.06.19

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3

[Intraday Flow] Samsung SDI Sees Net Buying from Foreigners & Institutions... Shares +6.70% - Newspim

뉴스핌 · 2026.06.19

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4

Margin Trading Surges as Kospi Crosses 9,000... Securities Firms

네이버뉴스 · 2026.06.19

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5

Kospi Takes a Breather Ahead of the '10,000 Point Milestone'

네이버뉴스 · 2026.06.19

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6

[Top 1% Master's Opening Pick] Taking Profits on Power Stocks, Returning to Chips... Scooping Up Samsung Elec & Hynix Again - EBN News Center

네이버뉴스 · 2026.06.19

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📺 Reference Videos (1)

7

YouTube

The Real Reason Tesla & Amazon Are Rushing to Samsung SDI with Cash... Sweeping Up 'At This Time' [Jjinconomy]

▶이투데이TV·2026.06.18