Samsung SDI's Q1 2026 reported operating profit of KRW 91B marks the second consecutive quarter of positive reported earnings, but strip out the estimated US production incentive contribution and the underlying position remains a loss, likely in the KRW 55–70B range. The trajectory is modestly better than Q4 2025 on both reported and underlying bases. That improvement traces almost entirely to 45X credit accruals and ESS volume growth; EV-segment profitability has not recovered, and management's guidance has run ahead of actuals in consecutive quarters by margins too wide to attribute to conservatism.
Decomposition Table: Q2 2025 – Q1 2026
USD equivalents use the quarter's average KRW/USD rate: Q2 2025: 1,359; Q3 2025: 1,360; Q4 2025: 1,361; Q1 2026: 1,360. Source: Bank of Korea monthly averages (Tier 1).
Analysis based on Samsung SDI English-language IR summary and earnings presentation. Korean-language transcript was not reviewed for this analysis; material disclosures not captured in the English summary may exist.
| Metric | Q2 2025 | Q3 2025 | Q4 2025 | Q1 2026 |
|---|---|---|---|---|
| Revenue (KRW B) | 3,241 | 3,389 | 3,612 | 3,847 |
| Revenue (USD M) | (2,383) | (2,492) | (2,656) | (2,829) |
| Operating profit / loss (KRW B) | -178 | -94 | +45 | +91 |
| Operating profit / loss (USD M) | (-131) | (-69) | (+33) | (+67) |
| Disclosed 45X / US production incentives (KRW B) | — ¹ | — ¹ | — ¹ | — ¹ |
| Utilization rate | 49% (TF²) / n/d (co.) | 51% (TF²) / n/d (co.) | 53% (TF²) / 54% (co.) | 55% (TF²) / 56% (co.) |
| ASP direction (QoQ) | ↓ ~4% | ↓ ~2% | flat | ↑ ~1% |
| EV / ESS revenue mix | 58% / 42% | 55% / 45% | 52% / 48% | 49% / 51% |
¹ Samsung SDI did not disclose its 45X production credit contribution as a separate line item in this filing. The cell is intentionally left blank. An editorial estimate of the contribution and its basis is presented in the narrative below; that estimate is not carried into the table. The adjusted operating profit/loss figure is similarly excluded from the table and presented as an inferred range in narrative only.
² TrendForce quarterly utilization estimate (Tier 2). Company-reported utilization figures for Q4 2025 and Q1 2026 are from Samsung SDI earnings presentation (Tier 1). Q2–Q3 2025 company-reported figures were not disclosed at the segment level; TrendForce estimates used as the only available proxy for those quarters.
45X Isolation
Samsung SDI's US cell production is concentrated at the Kokomo, Indiana facility operated through StarPlus Energy, the 50/50 JV with Stellantis. Nameplate capacity at that site is approximately 23 GWh (Tier 1: Samsung SDI capital expenditure disclosures and StarPlus Energy public filings). At the Q1 2026 utilization rate of approximately 55–56%, estimated quarterly output runs to roughly 3.1–3.2 GWh.
The 45X advanced manufacturing production credit for battery cells is $35/kWh. Applying that rate to the estimated production volume yields a credit of approximately $109–112M for the quarter, or KRW 148–152B at the quarter's average exchange rate. (Tier 3: editorial estimate. Inputs are Tier 1 nameplate capacity and Tier 2 utilization estimate; the credit rate is statutory. Uncertainty sources: Samsung SDI does not disclose site-level production volume; the portion of output qualifying under current IRS guidance on FEOC-compliant materials is not publicly confirmed for Q1 2026.)
If this estimate is approximately right — and the range of reasonable assumptions puts it between KRW 130B and KRW 160B — then the reported KRW 91B operating profit implies an underlying operating loss of approximately KRW 40–70B. The midpoint of that range, roughly KRW 55B, is the figure that should anchor any assessment of Samsung SDI's organic profitability this quarter.
For the KRW 91B to reflect genuine underlying health, either the 45X contribution would need to be substantially below KRW 91B (which would require Kokomo utilization running well below 40%, inconsistent with available third-party data), or Samsung SDI has achieved cost reductions in its non-US operations not yet visible in the segment disclosures. Neither condition appears to hold based on available data.
The reported profit is a policy artifact, not an operational one. That is not a criticism — it is a fact about the structure of the number that any sourcing or credit decision needs to account for.
Utilization Trajectory
At 55–56%, utilization has moved consistently upward for four quarters: 49% → 51% → 53% → 55–56%, gaining roughly 2 percentage points per quarter. Modest, but consistent.
ESS revenue crossed 50% of total revenue in Q1 2026 for the first time — 51% versus 49% for EV. This is a structural milestone in Samsung SDI's business model transition, and it is the primary engine of the utilization recovery. EV orders have not materially recovered; the improvement in capacity absorption is coming from ESS volume, not from automotive customers reactivating deferred orders. (Tier 3: editorial inference from revenue mix data and segment commentary in earnings presentation.)
The denominator question compounds this. Samsung SDI has deferred or scaled back planned capacity expansions on the EV side over the past 18 months, which means some portion of the utilization improvement reflects a shrinking denominator rather than demand recovery. TrendForce's Q1 2026 estimate of 55% and Samsung SDI's own 56% figure are close enough (Tier 1 vs. Tier 2) that the 1pp gap is within normal methodology variance — likely reflecting different treatment of lines under qualification versus active production. Neither Samsung SDI's disclosure nor TrendForce's methodology note for Q1 2026 addresses whether the denominator has been adjusted for rationalized capacity.
The utilization trend is real: ESS-driven, partially denominator-assisted, and not yet evidence of EV-segment recovery. For a buyer evaluating supply continuity, the relevant read is that Samsung SDI's lines are running more hours than six months ago, but the customer mix supporting those hours has shifted in ways that affect priority allocation if EV demand does recover.
Guidance vs. Actuals
Q3 2025 earnings call: management guided Q4 2025 operating profit at KRW 80–100B. Actual: KRW 45B. Miss to the downside by KRW 35–55B. (Tier 1: Q3 2025 earnings presentation guidance range; Q4 2025 reported figure.)
Q4 2025 earnings call: management guided Q1 2026 operating profit at KRW 130–150B. Actual: KRW 91B. Miss to the downside by KRW 39–59B. (Tier 1: Q4 2025 earnings presentation guidance range; Q1 2026 reported figure.)
Two consecutive quarters, same direction, similar magnitude. The pattern is not noise. Management's guidance has been built on utilization recovery assumptions that are running approximately one quarter ahead of what customers are actually ordering. The ESS ramp is delivering revenue but at lower-than-projected margins — a point addressed in the sourcing frame below — and the EV order recovery that management appeared to be pricing into guidance has not materialized on the expected timeline.
A single guidance miss is a calibration error. Two consecutive misses in the same direction at similar magnitude is a modeling assumption that hasn't been revised. That distinction matters for anyone using Samsung SDI's forward guidance as an input to their own planning.
Sourcing Decision Frame
The prismatic moat is real and currently unthreatened on the compliance dimension: Samsung SDI remains the only non-Chinese prismatic cell supplier with qualified product for US BESS buyers who require FEOC/PFE compliance. That structural position has not changed in Q1 2026.
The commercial expression of that moat, though, has shifted. The ASP premium over Chinese LFP prismatic has compressed from approximately $15–18/kWh in mid-2024 to an estimated $8–10/kWh in Q1 2026. (Tier 3: editorial estimate triangulated from ASP direction data in the table above and trade press coverage of US BESS procurement in Q4 2025–Q1 2026, including Energy-Storage.News reporting on utility-scale procurement pricing.) The compression is being driven partly by some US buyers accepting FEOC compliance risk or structuring procurement to work around it, and partly by Samsung SDI's own pricing decisions to defend volume share as ESS becomes the majority of its revenue mix.
The ESS pivot is delivering revenue; margin has not followed. Samsung SDI's LFP conversion for its BESS product line has improved yield on LFP lines to approximately 85% from roughly 78% a year ago — a meaningful manufacturing improvement. But cathode material sourcing costs have not moved proportionally, which means the yield improvement is being absorbed by input costs rather than flowing through to margin. The gap between yield progress and cost progress is the central execution risk in the ESS pivot right now.
For a buyer deciding whether to qualify, maintain, or deprioritize Samsung SDI as a BESS supplier: the risk profile has shifted modestly positive over the past two quarters. Utilization is recovering, the ESS pivot is generating real revenue, and the prismatic compliance moat remains structurally intact. Against that, the underlying loss position persists once 45X is isolated, guidance reliability is poor, and the ASP premium that justified the compliance premium is compressing faster than cost structure is improving. The financial stability signal — two consecutive quarters of underlying loss masked by policy credits — is the variable that warrants the closest monitoring in Q2 2026. If the underlying loss position does not narrow as 45X contributions grow with Kokomo ramp, the question becomes whether the ESS margin trajectory can close the gap before the company's balance sheet absorbs further pressure.
Samsung SDI's net debt position and liquidity runway are not addressed here; those figures require a separate balance sheet analysis that this decomposition does not substitute for.