If you do it, it gets done.
If you don’t, it doesn’t. So I do it again today.
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Why? Because they keep dancing until it rains.
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through company and industry analysis, and to sharpen my insight into the market.
Samsung SDI Company Analysis — Why It Returned to Profit After Two Years in the Battery Chasm
Samsung SDI posted a KRW 1.7224 trillion operating loss for full-year 2025, so when news broke that the company swung back to profit in Q2 2026 for the first time in seven quarters, I wanted to verify it directly through DART filings. Given how sharply the company’s results deteriorated in 2024-2025 amid slowing EV demand — the so-called “battery chasm” — I wanted to know whether this turn to profit was a one-off bounce or the start of a genuine turnaround.
Samsung SDI is a comprehensive energy and materials company built around three pillars: the world’s No. 1 small lithium-ion battery business (a position it has held since 2010), medium-to-large batteries for EVs and ESS, and an electronic-materials business serving the semiconductor and display industries. This article sets out to answer three questions: first, what drove the sharp deterioration in 2024-2025 after the 2023 peak; second, which business segment led the return to profit in H1 2026; and third, whether new-business investments like the 46-pi cylindrical battery and solid-state battery are solid enough to sustain this profitability. The analysis is based on DART’s H1 2026 semiannual report and the 2023-2025 annual reports.
Samsung SDI Company Overview — Key Data at a Glance
| Ticker Name | Samsung SDI | Ticker Code | 006400 (KOSPI) |
| Business | Medium-to-large batteries (EV, ESS), small batteries, electronic materials | Market Position | World’s No.1 in small lithium-ion batteries since 2010; supplies BMW, Stellantis, and other global automakers |
| H1 2026 Revenue | KRW 7,345.2B (YoY +15.6%) | Operating Profit | KRW 48.2B (turned profitable) |
| H1 2026 Operating Margin | 0.7% — turned positive from -13.1% a year earlier | Net Income (Controlling) | KRW 314.1B (turned profitable) |
| Q2 2026 (Standalone) Operating Profit | KRW 203.8B — first quarterly profit in 7 quarters | Total Assets (end of H1 2026) | KRW 47,621.9B |
| Total Equity | KRW 26,836.2B | Debt Ratio | 77.5% (in line with the manufacturing-sector average; solid financial health) |
| Basis of Analysis | DART H1 2026 semiannual report + 2023-2025 annual reports (consolidated financial statements) | ||
Samsung SDI Business Structure — From the World’s No. 1 Small Battery Maker to ESS and Solid-State
Samsung SDI’s business breaks down into four main segments: small batteries, automotive (medium-to-large) batteries, ESS, and electronic materials. Small lithium-ion batteries have been the company’s cash cow, holding the world’s No. 1 market share since 2010, while automotive batteries — prismatic and cylindrical cells supplied to BMW, Stellantis, Rivian, and other global automakers — form the core growth engine. The ESS segment supplies utility-scale, commercial, and residential batteries tied to renewable-energy generation, and has seen particularly strong growth recently on the back of rising U.S. data-center power demand. The electronic-materials business, built out from the Gumi plant since 2002, has expanded into semiconductor, display, and battery materials.
In Q2 2026, the battery segment’s revenue reached KRW 3,519.0B (YoY +18.8%) and its operating profit turned positive at KRW 159.3B, driving the overall earnings improvement. This suggests the company has moved past the trough of the EV-demand-driven “battery chasm” and is now seeing volume recovery in ESS and North America. Whether this turnaround is a durable trend or a temporary bounce concentrated in a few large customer accounts is something that will need to be confirmed with the next quarter’s results.
Samsung SDI 3-Year Financial Trend — Two Straight Years of Decline After the 2023 Peak, Then a 2026 Rebound
| Category | 2023 | 2024 | 2025 | H1 2026 |
|---|---|---|---|---|
| Revenue | KRW 22,708.3B | KRW 16,592.3B | KRW 13,266.7B | KRW 7,345.2B |
| Operating Profit | KRW 1,633.4B | KRW 363.3B | -KRW 1,722.4B | KRW 48.2B |
| Operating Margin | 7.2% | 2.2% | -13.0% | 0.7% |
| Net Income (Controlling) | KRW 2,009.2B | KRW 599.3B | -KRW 649.5B | KRW 314.1B |
| YoY Operating Profit | — | -77.8% | Turned to loss | Turned to profit |
| Debt Ratio | 71.0% | 88.2% | 79.3% | 77.5% |
Revenue fell for two straight years, from KRW 22.7 trillion in 2023 to KRW 16.6 trillion in 2024 and KRW 13.3 trillion in 2025, while operating profit collapsed from a KRW 1,633.4B surplus in 2023 to just KRW 363.3B in 2024, before swinging to a massive KRW 1,722.4B loss in 2025. I read this as the result of automakers cutting battery orders amid slowing EV demand (the “battery chasm”), which drove down utilization rates and left fixed costs weighing more heavily on the P&L. But H1 2026 revenue rebounded to KRW 7,345.2B (YoY +15.6%), and operating profit turned positive at KRW 48.2B. Notably, Q2 alone delivered KRW 203.8B in operating profit — the first quarterly profit since Q3 2024, seven quarters ago. The fact that DART’s cumulative H1 figure (KRW 48.2B) matches the company’s own Q2 earnings release exactly (KRW 203.8B in Q2, netted against a Q1 loss to produce KRW 48.2B for H1) gives me confidence this is a reliable signal rather than a reporting quirk.
Samsung SDI Balance Sheet Deep Dive — What a 25% Inventory Jump and Rising Equity-Method Investments Mean
| Item | End of 2025 | End of H1 2026 | Change |
|---|---|---|---|
| Total Assets | KRW 42,255.3B | KRW 47,621.9B | +12.7% |
| Total Equity | KRW 23,570.1B | KRW 26,836.2B | +13.9% |
| Total Liabilities | KRW 18,685.2B | KRW 20,785.7B | +11.2% |
| Debt Ratio | 79.3% | 77.5% | -1.8%p |
| Cash & Equivalents | KRW 1,804.0B | KRW 1,505.5B | -16.5% |
| Inventory | KRW 2,936.3B | KRW 3,675.5B | +25.2% |
| Investment in Associates | KRW 11,426.8B | KRW 14,105.3B | +23.4% |
| Operating Cash Flow (H1 2026) | — | KRW 109.4B | Stayed positive, but down from KRW 701.6B a year earlier |
The standout line item is inventory, which rose 25.2% from KRW 2,936.3B at the end of 2025 to KRW 3,675.5B at the end of H1 2026. Rising inventory during a turnaround phase is usually read one of two ways: either the company is proactively ramping up production ahead of a demand recovery, or sales are falling short of expectations and inventory is piling up. Given that battery-segment revenue is genuinely growing (Q2 YoY +18.8%), I lean toward the former explanation, but inventory turnover trends need continued monitoring next quarter. The 23.4% increase in investment in associates points to continued expansion of equity-method investments in U.S. joint ventures with Stellantis, GM, and others — consistent with the company’s North American production-footprint strategy. The debt ratio, at 77.5%, remains at a typical manufacturing-sector level, well below what’s seen in project-based industries like defense or shipbuilding, so overall financial health looks stable. That said, with cash and equivalents down 16.5%, cash-flow management during this period of overlapping new CAPEX (46-pi, solid-state) and inventory buildup is a metric worth watching closely.
Samsung SDI CAPEX & New Business — Betting on 46-Pi Cylindrical Cells and Solid-State Batteries
2026 facility investment is concentrated on future growth areas: building out a 46-pi (46mm-diameter) cylindrical-battery line at the Göd plant in Hungary, retrofitting a U.S. ESS production site, and investing in a Malaysian production base — with total CAPEX expected to decline slightly from the prior year. The 46-pi line is being pursued at the request of key customer BMW, with initial investment estimated at around KRW 1 trillion; the company has already begun initial shipments to a U.S. customer, suggesting the new-product ramp-up is at an early stage of translating into actual revenue. The solid-state battery is being developed via a pilot line at the Suwon R&D center, targeting mass production in 2027, with sample shipments reportedly already underway to major customers including BMW. The ESS segment, buoyed by rising U.S. data-center power demand, is the business the company is leaning on as its key answer to North American market uncertainty.
Samsung SDI Earnings Drivers — What’s Behind Two Years of Losses and the 2026 Rebound
| Driver | Detail | Temporary/Structural |
|---|---|---|
| ① The battery chasm (slowing EV demand) | Falling battery orders and lower utilization at automakers in 2024-2025 drove two straight years of revenue decline, culminating in a KRW 1,722.4B operating loss in 2025 | Structural, but showing signs of easing in 2026 |
| ② Battery-segment volume recovery | Q2 2026 battery-segment revenue reached KRW 3,519.0B (YoY +18.8%) with operating profit of KRW 159.3B, turning positive and driving the company-wide recovery | Structural (ESS and North American volume recovery) |
| ③ Cash-flow strain from rising inventory | Inventory rose 25.2% within a single half-year, and operating cash flow fell year-over-year (KRW 701.6B to KRW 109.4B) | Temporary (interpreted as proactive production ahead of demand recovery) |
✅ 3 Investment Highlights
① Confirmed quarterly profit after 7 quarters
Q2 2026 operating profit of KRW 203.8B marked the first quarterly profit since Q3 2024, and the exact match between DART’s cumulative H1 figure (KRW 48.2B) and the company’s own disclosure gives this rebound signal high credibility.
② World No.1 small-battery position and a diversified portfolio
The company’s small lithium-ion battery leadership, held since 2010, is complemented by ESS and electronic-materials businesses that act as an earnings stabilizer.
③ 46-pi and solid-state batteries as next-generation growth drivers
Initial 46-pi shipments to BMW have begun, and the solid-state battery pilot line is running toward a 2027 mass-production target, securing mid-to-long-term technology competitiveness.
⚠️ 3 Risks
① Early-stage turnaround, margins still thin
The H1 2026 operating margin was just 0.7%, too early to call this a full-fledged profitability recovery.
② Falling cash and surging inventory
Cash and equivalents fell 16.5% while inventory rose 25.2%; whether this inventory converts into actual sales needs to be confirmed next quarter.
③ North American policy and tariff variables
Changes to U.S. IRA tax-credit policy and tariff issues remain external variables in North America that could determine whether the earnings recovery is sustained.
My Investment Judgment on Samsung SDI
This company has just taken its first step out of a two-year tunnel of heavy losses. The rebound signals — KRW 203.8B in standalone Q2 operating profit and the battery segment’s return to profit — are backed by concrete numbers and are encouraging, but with the full H1 operating margin at just 0.7%, I think it’s too early to call this a full profitability normalization. The 46-pi and solid-state battery pipeline looks solid, but meaningful revenue contribution isn’t expected until 2027 or later.
My judgment is to wait and see. Two facts support this. First, while the return to profit is confirmed, a single quarter’s rebound isn’t enough to declare the battery chasm over. Second, the 25.2% rise in inventory coincides with a 16.5% drop in cash, so I want at least one or two more quarters of evidence that this inventory is actually converting into sales.
The triggers that would change my view are these: ① if the battery segment stays profitable and the operating margin keeps improving through Q3 2026, confirming a trend-based rebound, I will shift to increasing my position. ② Conversely, if the inventory buildup turns out to reflect weak sales, or if U.S. policy shifts cause volumes to decline again, I will either maintain a wait-and-see stance or turn more cautious.
⚠️ Investment Disclaimer
This article is an individual investor’s analysis based on DART electronic disclosure filings and does not constitute investment advice.
All investment decisions must be made at your own judgment and responsibility.
Stock investing carries the risk of principal loss.
References
- DART Electronic Disclosure System: https://dart.fss.or.kr
- Samsung SDI official website: https://www.samsungsdi.co.kr
- “Samsung SDI Announces Q2 2026 Results” (Samsung SDI Newsroom): https://www.samsungsdi.co.kr/sdi-now/sdi-news/4941.html
- “Lee Jae-yong’s ‘battery sales tour’ — can Samsung SDI take flight with 46-pi and solid-state?” (Daum News): https://v.daum.net/v/20260315144301792
- Basis of analysis: DART H1 2026 semiannual report + 2023-2025 annual reports (consolidated financial statements)
