Samsung SDI's headline trajectory is improving. The operating loss narrowed from KRW 591.3B at the Q3 2025 trough to KRW 155.6B in Q1 2026, beating consensus by roughly KRW 120B. That is three consecutive quarters of narrowing losses since the Q3 2025 trough. Strip the AMPC contribution that management cited but refused to quantify, and the organic trajectory is, at best, flat. Revenue declined 7.3% QoQ (KRW 3.86T to KRW 3.58T), meaning the operating improvement came from incentives and cost structure, with no top-line recovery underneath it. The recovery is real in accounting terms and unverifiable in organic terms, earned through a US production chain whose PFE compliance depends on a regulatory definition Treasury has not written.
This is the first Samsung SDI quarterly decomposition published in this format. No prior-quarter baseline exists for cross-reference.
Decomposition Table
Five-quarter trailing. Currency is KRW. USD equivalents use Q1 2026 average of ~1,450 KRW/USD; prior quarters use period-average rates. All figures from Samsung SDI IR.
| Q1 2025 | Q2 2025 | Q3 2025 | Q4 2025 | Q1 2026 | |
|---|---|---|---|---|---|
| Reported revenue | 3.18T ($2.19B) | 3.18T ($2.13B) | 3.05T ($2.13B) | 3.86T ($2.66B) | 3.58T ($2.47B) |
| Reported operating profit/loss | −434.1B (−$299M) | −397.8B (−$286M) | −591.3B (−$413M) | −299.2B (−$206M) | −155.6B (−$107M) |
| Disclosed US production incentives (45X/AMPC) | — ¹ | — ¹ | — ¹ | — ¹ | — ¹ |
| Adjusted operating profit/loss | n/c | n/c | n/c | n/c | n/c |
| Reported utilization rate | — ² | — ² | — ² | — ² | — ² |
| ASP direction | — ³ | — ³ | — ³ | — ³ | — ³ |
| EV vs. ESS revenue mix | — ⁴ | — ⁴ | — ⁴ | — ⁴ | — ⁴ |
| Battery segment op loss | −452.4B | −430.8B | −630.1B | −338.5B | −176.6B |
| Electronic materials op profit | +18.3B | +33.0B | +38.8B | +39.3B | +21.0B |
¹ Samsung SDI has never separately disclosed AMPC in quarterly earnings. Q4 2025 and Q1 2026 IR language cited "increased AMPC benefits" without a figure. FY2025 AMPC estimated at KRW 275B by BESS Manufacturers (third-party analysis of annual filing, not company-disclosed). NH Investment pre-estimated Q1 2026 AMPC at KRW 84.9B. Neither figure is confirmed by Samsung SDI.
² Samsung SDI does not report quarterly utilization. FY2025 overall utilization was ~50% (Seoul Economic Daily, March 2026). H2 2026 target is ~70% at Hungary (The Elec, June 2026).
³ No ASP commentary in English-language IR materials for any quarter shown.
⁴ Samsung SDI combines EV, ESS, and small-format batteries in a single Energy Solutions segment. No disclosed split.
This analysis relies on English-language IR summaries and earnings call highlights. Korean-language transcripts may contain interpretive detail not captured here, including possible disclosure of the >KRW 2T ESS deal counterparty.
Pass 1 — 45X Isolation
The adjusted operating loss row is blank for the fifth consecutive quarter. Samsung SDI will not disclose AMPC separately. Five quarters of consistent non-disclosure makes this a structural feature of their reporting, and it makes the decomposition this section exists to perform impossible to execute from primary sources.
What can be triangulated: BESS Manufacturers puts FY2025 AMPC at KRW 275B, tripled from KRW 90B in FY2024. NH Investment pre-estimated Q1 2026 at KRW 84.9B. The quarter beat consensus by ~KRW 120B. If AMPC came in materially above the NH estimate, in the range of KRW 150–200B (editorial inference, labeled as such), the pre-incentive battery segment loss would land around KRW 325–375B. That is Q2 2025 territory. The organic business, on this inference, has not moved. Revenue declining 7.3% QoQ while the operating loss improved by KRW 144B reinforces the read: the improvement came from cost structure and incentives, with the top line still contracting.
A complication at the consolidated level: electronic materials profit dropped 47% QoQ (KRW 39.3B to KRW 21.0B), partially offsetting the battery improvement. The battery-specific trajectory actually improved more than the headline suggests. This does not change the organic assessment, because the battery improvement itself is where the AMPC question concentrates.
The inference requires a caveat that matters more than the usual estimation uncertainty. Samsung SDI's AMPC eligibility depends on passing the 45X MACR test: for 2026, at least 60% of direct material costs must come from non-PFE sources. The 45X MACR denominator includes only direct materials, not labor (IRS Notice 2026-15). For battery cell production, cathode active material dominates that denominator, making the CAM sourcing question decisive. Samsung SDI's cathode precursor investment runs through Pino, a Korean subsidiary of CNGR, China's largest precursor manufacturer. CNGR-affiliated entities hold ~45% of Pino post-investment.
Whether 45% constitutes "effective control" by a Specified Foreign Entity is the decisive question. Notice 2026-15 provides the computational framework but explicitly defers on the effective control definition. Treasury must publish proposed regulations by December 31, 2026. Samsung SDI is booking AMPC credits against a compliance test whose key variable is undefined. The company's own Q1 call acknowledged challenges meeting non-PFE regulations. That language, paired with the non-disclosure of the AMPC figure, reads as a company that believes its position is defensible under interim guidance and knows it may not survive final rulemaking.
A downstream compliance layer compounds this. BESS project developers purchasing Samsung SDI cells for projects beginning construction in 2026 must pass their own 48E MACR test at a 55% threshold for energy storage technologies. The same Pino/CNGR ownership question propagates from Samsung SDI's cell-level 45X eligibility to the buyer's project-level 48E eligibility. A cell that qualifies on Samsung SDI's books can still create compliance risk on the buyer's books. Cathode provenance uncertainty suppresses order quality even when headline order volume looks healthy, because the buyer's own tax credit is at stake.
Pass 2 — Utilization Trend
No Q1 2026 utilization figure exists from Samsung SDI or any named third party. The row is blank and confirmed blank.
SNE Research, via Electrive, reported Samsung SDI shipped 5.3 GWh globally in Q1 2026, down 27.7% YoY. This captures EV installations only and excludes ESS, so it understates total output. But EV volume has historically driven the majority of Samsung SDI's production, and the contraction is directionally clear.
Management pointed to Hungary as the constraint: relaxed European CO₂ regulations and Chinese EV penetration cited as headwinds. The H2 2026 target of ~70% utilization at Hungary, with break-even contingent on reaching that level, implies Q1 2026 was materially below 70%. Against FY2025's overall 50%, Q1 2026 likely remained in a similar range. The second derivative is not visible from available data. No evidence the rate of decline is decelerating. No evidence it is accelerating. Stasis, with recovery contingent on H2 events that have not occurred.
The Mercedes-Benz supply agreement and Volkswagen Unified Cell contract (mass production targeted 2027) add future volume commitments at Hungary. They deliver no utilization improvement in 2026. Samsung SDI now counts all three German premium brands as customers. The gap between signed contracts and production-line loading is the same gap this section tracks across all three Korean makers, just at a different plant.
Pass 3 — Guidance vs. Actuals
Q4 2025 guidance for Q1 2026:
"Seasonal softness, then sequential improvement, with quarterly profit in H2 2026."
Q1 2026 actual: KRW 155.6B operating loss, an improvement over Q4 2025's KRW 299.2B. Management guided down and the quarter came in up. The beat is almost certainly AMPC-driven, which means guidance was calibrated to organic operations while the result was lifted by incentives. The guidance framework cannot isolate underlying trajectory when the company won't separate the incentive from the organic result.
The forward projections that load-test against the cathode supply chain:
H2 2026 quarterly profit. Management has now made this call twice. They guided for H2 2025 profit during Q2 2025. Q4 2025 posted a KRW 299.2B loss. They guided for H2 2026 profit during Q4 2025. One confirmed miss. Two consecutive misses in the same direction would be a structural credibility problem. The H2 2026 call depends on StarPlus LFP lines starting October 2026 (two lines ramping sequentially, meaning full LFP capacity may not be reached until Q1 2027) and Hungary reaching 70% utilization. Neither has been substantiated by Q1 data.
The cathode timing gap. StarPlus LFP production starts October 2026. L&F cathode supply starts 2027. The KRW 1.6T deal is signed but the supply timeline creates a gap of at least one quarter. The interim LFP cathode source for October–December 2026 production has not been publicly identified. This is the load-bearing unknown in the entire H2 2026 narrative. If the interim source is PFE-linked, the MACR test may fail for Q4 2026 production, undermining both the 45X credit and buyer-side 48E compliance. If the interim source is non-PFE but unqualified at cell level, yields and ramp timelines are at risk. Samsung SDI has not addressed this in any English-language disclosure.
The >KRW 2T ESS supply deal. Samsung SDI described securing orders covering "a significant portion of US production capacity for the next two to three years." The unnamed-customer deal reportedly starts 2027 delivery, not 2026. It contributes nothing to H2 2026 profitability. Treat as a framework agreement until Samsung SDI specifies contractually committed volumes. The circularity here is direct: BESS developers who cannot verify cathode provenance face their own 48E compliance risk, which means order firmness depends on the same provenance clarity Samsung SDI has not provided. The order book and the supply chain are coupled through the same unresolved regulatory variable.
ESS +50% YoY revenue growth target. Untestable from Q1 data given the absence of an EV/ESS segment split. The claim depends on the same StarPlus ramp that depends on the same cathode supply chain.
Sourcing Decision Frame
Samsung SDI's structural position is real and unchanged: the only non-Chinese prismatic cell supplier with US production capacity, a genuine differentiator for BESS buyers who require prismatic format and FEOC-compliant sourcing. Between Q4 2025 and Q1 2026, the risk changed character. In Q4, the open question was whether the Q3 2025 trough was real or whether losses would continue widening. Q1 confirmed the trough is past. The operating loss trajectory is improving. But the recovery mechanism itself introduced a new concentration of risk: AMPC dependence running through an unresolved compliance chain. For qualification decisions, Samsung SDI's probability of delivering compliant prismatic LFP cells from US production has increased for 2027 and beyond, once L&F supply is online and the regulatory framework is published. For Q4 2026, the quarter management is staking the profit inflection on, no disclosed cathode sourcing plan supports the claim. That is where the program risk concentrates.
- Pino stake closing status: Samsung SDI's KRW 30B investment in Pino was announced in March 2026, but whether the transaction has closed and whether CNGR's ownership has diluted below a PFE control threshold has not been confirmed in subsequent filings.
- Treasury PFE proposed regulations: IRS Notice 2026-15 defers the "effective control" definition that determines whether CNGR's ~45% stake in Pino triggers PFE status, and Treasury must publish proposed regulations by December 31, 2026.
- StarPlus LFP line ramp: The Elec reported that two LFP lines at StarPlus will come online sequentially starting October 2026, meaning full LFP capacity may not be reached until Q1 2027 and Q2 2026 earnings should show whether the timeline holds.
- Hungary utilization inflection: Samsung SDI is targeting ~70% utilization at Hungary in H2 2026 with break-even contingent on that level, making Q2 and Q3 disclosures the first testable data points for the EV-side recovery narrative.