The Hysteresis | Korea

Cathode Supply Map

Korean makers supply the bulk of FEOC-compliant ESS cell capacity in the US on an announced basis. All three are ramping or converting American lines for LFP production. None has publicly named a PFE-compliant cathode active material supplier for current output. Zero for three.

That provenance gap collides with a regulatory calendar: Treasury's final safe harbor tables are due December 31, 2026, and the "effective control" definition that will determine which supply chains qualify hasn't been written. Korean makers are building production against a compliance framework that doesn't exist in final form.

Six cards below. Cards 1 through 4 map the cathode and compliance layer. Cards 5 and 6 provide financial and volume context. Status and data points, not analysis.

Cathode Supply Map

Korean makers supply the bulk of FEOC-compliant ESS cell capacity in the US on an announced basis. All three are ramping or converting American lines for LFP production. None has publicly named a PFE-compliant cathode active material supplier for current output. Zero for three.

That provenance gap collides with a regulatory calendar: Treasury's final safe harbor tables are due December 31, 2026, and the "effective control" definition that will determine which supply chains qualify hasn't been written. Korean makers are building production against a compliance framework that doesn't exist in final form.

Six cards below. Cards 1 through 4 map the cathode and compliance layer. Cards 5 and 6 provide financial and volume context. Status and data points, not analysis.

LG Cathode

LG Running LFP at Two Plants, CAM Undisclosed

Holland, Michigan: LFP ESS production active since May 2025, targeting 17 GWh via retooled EV lines. Windsor (NextStar): ESS-only, over 1M cells since November 2025, 49.5 GWh nameplate. Cathode active material supplier: unnamed at both sites. PFE compliance posture: no public disclosure of methodology or provenance.

Samsung Cathode

Samsung SDI's LFP Cathode Gap Spans Two Layers

StarPlus converting three NCA EV lines to LFP ESS, mass production targeting Q4 2026. L&F cathode deal signed (KRW 1.6T) but supply starts 2027. Interim source: unnamed. Precursor layer: 7.5% Pino stake, but CNGR entities retain ~45% (Zoomwe HK 31.37%, CNGR HK 13.58%). Management flagged PFE compliance as a challenge on the Q1 2026 call.

SK On

SK On ESS: Korean Tender Win, No US Timeline

Won 284 MW (50.3%) of Korean government ESS tender with LFP pouch cells. No US LFP mass production timeline disclosed. No cathode supplier named for any ESS application. Georgia plant SOP reportedly October 2026, cathode supply covered only by a non-binding L&F MOU. Least defined ESS posture of the three.

PFE Rules

PFE Safe Harbor Tables Still Missing at Midyear

IRS Notice 2026-15 interim MACR guidance in effect since February 2026. Final safe harbor tables due December 31, 2026. "Effective control" definition for Specified Foreign Entities remains unwritten. Battery cells absent from interim tables entirely. Taxpayers operating under reliance period until proposed regulations issue.

Q1 Earnings

All Three Korean Makers Lost Money in Q1

LG Energy Solution: KRW 6.6T revenue, KRW -207.8B operating loss. Strip the disclosed KRW 189.8B in North American incentives and the underlying loss is KRW -397.6B. Samsung SDI: KRW 3.58T revenue, KRW -155.6B loss, AMPC not broken out. SK On: KRW 1.79T revenue, KRW -349.2B loss, AMPC not disclosed. Source: company earnings releases, April–May 2026.

EV Volume

Korean Combined EV Battery Share Fell to 15.6%

Q1 2026 global EV installations per SNE Research: LG 23.7 GWh (+6.6% YoY), Samsung SDI 5.3 GWh (-27.7% YoY), SK On 9.0 GWh (-10.4% YoY). Combined share down 2.1pp YoY to 15.6%. SK On decline partly structural: F-150 Lightning discontinued, VW ID.4 US production ended. Source: SNE Research via Electrive, May 6, 2026.

The Earnings Decomposition

Samsung SDI Q1 2026 — The Recovery That Can't Name Its Cathode Supplier

By Ronan Adike— June 8, 2026

Feature image for article: Samsung SDI Q1 2026 — The Recovery That Can't Name Its Cathode Supplier

Samsung SDI's Q1 2026 operating loss narrowed to KRW 155.6B, beating consensus by ~KRW 120B — three consecutive quarters of improvement since the Q3 2025 trough. But management cited "increased AMPC benefits" without disclosing a figure, and revenue fell 7.3% QoQ. Strip the incentive and the organic business hasn't moved. Every forward projection — H2 2026 profitability, the >KRW 2T ESS order, the StarPlus LFP ramp — traces back to a cathode supply chain whose PFE compliance depends on a regulatory definition Treasury hasn't written. LFP production starts October 2026. L&F cathode supply starts 2027. The interim source is undisclosed.

The Earnings Decomposition

Samsung SDI Q1 2026 — The Recovery That Can't Name Its Cathode Supplier

By Ronan Adike— June 8, 2026

Samsung SDI's Q1 2026 operating loss narrowed to KRW 155.6B, beating consensus by ~KRW 120B — three consecutive quarters of improvement since the Q3 2025 trough. But management cited "increased AMPC benefits" without disclosing a figure, and revenue fell 7.3% QoQ. Strip the incentive and the organic business hasn't moved. Every forward projection — H2 2026 profitability, the >KRW 2T ESS order, the StarPlus LFP ramp — traces back to a cathode supply chain whose PFE compliance depends on a regulatory definition Treasury hasn't written. LFP production starts October 2026. L&F cathode supply starts 2027. The interim source is undisclosed.

LG's Parallel Opacity

LG Energy Solution Is Collecting 45X on ESS Cells Without Naming a Cathode Supplier

Holland and Windsor are both producing LFP ESS cells. Neither has a publicly disclosed cathode active material supplier. Media tours of Holland described manufacturing equipment in detail but never named the CAM source. LG's IR materials are silent. The one identified upstream node, Jae Se New Energy, is a Longbai-affiliated entity currently restructuring ownership to push Chinese equity below 25% (The Elec, April 7, 2026). LG has not acknowledged the relationship.

Strip KRW 189.8 billion in disclosed Q1 2026 incentives from the reported KRW -207.8 billion operating loss and the underlying deficit runs roughly KRW 397.6 billion. That incentive fell 43% QoQ from Q4 2025's KRW 332.8 billion on lower pouch-EV volumes. The credit is volume-dependent. Volume is falling.

LG's Parallel Opacity

LG Energy Solution Is Collecting 45X on ESS Cells Without Naming a Cathode Supplier

Holland and Windsor are both producing LFP ESS cells. Neither has a publicly disclosed cathode active material supplier. Media tours of Holland described manufacturing equipment in detail but never named the CAM source. LG's IR materials are silent. The one identified upstream node, Jae Se New Energy, is a Longbai-affiliated entity currently restructuring ownership to push Chinese equity below 25% (The Elec, April 7, 2026). LG has not acknowledged the relationship.

Strip KRW 189.8 billion in disclosed Q1 2026 incentives from the reported KRW -207.8 billion operating loss and the underlying deficit runs roughly KRW 397.6 billion. That incentive fell 43% QoQ from Q4 2025's KRW 332.8 billion on lower pouch-EV volumes. The credit is volume-dependent. Volume is falling.

TAKE NOTE

NextStar terms: Stellantis exited its 49% stake for a nominal fee on a plant with CAD 5B+ invested, pivoted from EV to ESS-only. Distressed pricing is a valuation signal earnings guidance won't give you.

Acquisition pending: NextStar close has not been announced as of June 8, 2026. Windsor's 49.5 GWh nameplate sits in a pre-close legal state.

Underlying erosion: Ex-incentive operating loss widened from roughly KRW 83 billion in Q1 2025 to KRW 397.6 billion in Q1 2026, a trajectory the headline figure obscures.

Windsor caveat: Canadian production subsidies fund NextStar, not US 45X credits. Windsor ESS volume does not replace the declining American incentive stream.

Supplier fracture: LG dropped LG Chem cathode for Tesla NMC cells in favor of L&F since H2 2025, straining the intragroup relationship that would naturally supply LFP provenance.

Source Materials

Samsung SDI's LFP Supply Chain Runs Through CNGR at Every Node

Maps CNGR's ownership stakes in Pino and CNP New Materials, establishing the Chinese-entity exposure at the core of Samsung SDI's precursor network.

Samsung SDI and L&F Lock In $1.2B LFP Cathode Deal — Starting 2027

Confirms L&F cathode deliveries begin 2027, which means StarPlus LFP production through late 2026 depends on an undisclosed interim supplier.

The MACR Formula That Will Test Korean Cathode Compliance Claims

Samsung SDI Posts Sharpest Volume Decline Among Global Top 10 in Q1 2026

All Three Korean Makers Below 50% Utilization, KRW 3.2 Trillion in Combined Losses Ex-Credits

Source Materials

Samsung SDI's LFP Supply Chain Runs Through CNGR at Every NodeMaps CNGR's ownership stakes in Pino and CNP New Materials, establishing the Chinese-entity exposure at the core of Samsung SDI's precursor network.

Samsung SDI and L&F Lock In $1.2B LFP Cathode Deal — Starting 2027Confirms L&F cathode deliveries begin 2027, which means StarPlus LFP production through late 2026 depends on an undisclosed interim supplier.

Quick links

The MACR Formula That Will Test Korean Cathode Compliance Claims

Samsung SDI Posts Sharpest Volume Decline Among Global Top 10 in Q1 2026

All Three Korean Makers Below 50% Utilization, KRW 3.2 Trillion in Combined Losses Ex-Credits