Headline LME nickel inventories are a study in contradiction. At roughly 287,550 tonnes, exchange stocks stand 44% higher than the same period last year — a level that would conventionally signal deep market surplus. Yet the price has rallied 22% year-on-year to trade at $18,790/t. The explanation lies in the direction of the trend: stocks are no longer rising. They are gently declining from the cycle highs reached in late 2025, and the trajectory matters more than the absolute level. (FACT: LME, Macquarie, May 2026)
The inventory build of 2024-2025 was driven by a flood of Chinese and Indonesian refined cathode — Class 1 metal (≥99.8% nickel content) produced as a byproduct of the Class 2 processing boom — being shipped directly into LME warehouses. That surge has now peaked. Weekly delivery notices have slowed materially, and warrant cancellations have increased as the physical market absorbs available metal. The LME stock curve is flattening, and several analysts expect outright drawdowns in the second half of 2026 if Indonesia's ore constraints continue to bite. (FACT: SMM, LME, ING, May 2026)
However, the overhang remains substantial enough to cap any explosive rally. At current consumption rates, LME stocks represent roughly 5 weeks of global refined nickel demand — compared to less than 2 weeks for copper or zinc. This buffer means that no matter how tight the ore market becomes, there is a physical reserve of Class 1 metal that can be delivered against exchange positions. Every significant price spike toward $19,500-20,000/t will likely be met by warrant issuance, creating a self-limiting ceiling. (FACT: LME, ING Think, May 2026)
The key insight is that the LME inventory story is bifurcated. The headline 287,550 tonnes is predominantly Class 1 refined nickel, which serves the cathode market. The Class 2 market — NPI, ferronickel, MHP — operates on different fundamentals entirely, where Indonesian ore constraints and Weda Bay maintenance are creating real supply tightness. The disconnect between Class 1 stocks and Class 2 availability is the defining feature of the current nickel market: a visible surplus that masks a hidden shortage.
The 287,550 tonnes in LME warehouses is a false comfort for consumers of NPI, ferronickel, or MHP. These Class 2 products are not deliverable against LME contracts, and their supply is tightening. For cathode buyers, the stock cushion provides near-term security — but the declining trend means that window is closing. Buyers should distinguish sharply between their Class 1 and Class 2 exposures. For Class 2, the time to secure supply is now, before the stock drawdown accelerates and premiums widen. For Class 1, the buffer exists but is shrinking — use it to negotiate favorable terms while it lasts, but do not assume it will persist through year-end.