← Back to Blog · 2026-09-16 · 7 min read · Market Preview
Picture this: LME copper has been grinding higher for two weeks, momentum looks unstoppable, and you're ready to ride it. Meanwhile, on the Shanghai Futures Exchange, copper barely moves. A week later, LME rolls over — and SHFE copper falls harder. You just got whiplashed by two forces most Western traders never look at: warehouse warrant stocks and the spot-futures basis.
If you're trading or evaluating Chinese commodity futures, copper (ticker cu on the Shanghai Futures Exchange) is the contract where domestic microstructure matters most. And the good news is that the two data points that explain most of its idiosyncratic moves are published, free, and easy to read once you know what they mean.
What Warehouse Warrants Actually Are (and Why They Move Prices)
A warehouse warrant on SHFE is a standardized receipt for physical metal stored in an exchange-registered warehouse. It's not a warehouse receipt from some random bonded storage operator — it's the only document that allows you to make delivery against a futures contract. Think of it as the physical settlement layer of the Chinese copper market.
Every trading day, SHFE publishes the total warrant stock: how many tons of deliverable copper sit in registered warehouses, broken down by region (Shanghai, Jiangsu/Guangdong area, and other delivery locations). This number is the Chinese equivalent of COMEX or LME warehouse inventory — except it behaves differently, and that's where the edge lives.
Three things warrant stocks tell you
- Deliverable supply tightness. Falling warrant stocks mean someone is taking metal out of the delivery system — usually because the cash market is paying a premium over futures, making it profitable to strip warrants and sell spot.
- Delivery squeeze risk. When warrant stocks are very low relative to open interest in the front month, longs can press shorts who can't source metal. If you remember the COMEX copper squeeze in mid-2024, when massive volumes of copper rushed toward US warehouses ahead of potential tariff action, you've seen this dynamic play out — SHFE has its own domestic version of that game.
- Seasonal and policy flows. Warrant stocks often build ahead of major delivery months and drain during peak consumption seasons. Sudden injections can also reflect state reserve sales or smelters pushing metal into the delivery system when the futures price looks rich versus spot.
The key habit: check the warrant stock number alongside the front-month open interest. Warrants alone don't tell you much; warrants relative to the size of the delivery commitment tell you everything.
The Basis: China's Real-Time Supply-Demand Telegram
The basis is simply the spot price minus the futures price. In China, the spot reference traders watch is typically the Yangtze (or SMM) spot copper quote in Shanghai, quoted as a premium/discount over the active SHFE contract — something like "spot +150" meaning spot trades 150 yuan per ton above the futures.
Here's the logic chain every Chinese copper trader internalizes:
- Positive and widening basis (spot premium rising): physical demand is outrunning deliverable supply. Spot buyers are paying up, warrants drain, and the futures front month tends to get supported or squeezed upward.
- Negative basis (spot discount): physical is heavy. Consumers can wait, metal is plentiful, and shorts in the futures market have easy access to warrants for delivery. Downside moves in futures get confirmed.
This matters because Chinese copper futures frequently decouple from LME. Global macro sets the direction, but the domestic basis decides whether the SHFE contract obeys. When you see SHFE copper refusing to follow an LME rally, check the basis and warrant stocks before assuming the market is "wrong." Often it's telling you something about Chinese physical demand that the Western market hasn't priced yet.
Contract Specs You Need Before Touching It
Before we get to strategy, the mechanical facts. Getting these wrong is how new traders blow up on Chinese commodity futures before their view is even tested.
| Item | SHFE Copper (cu) |
|---|---|
| Exchange | Shanghai Futures Exchange (SHFE) |
| Contract size | 5 metric tons per lot |
| Tick size | 10 yuan per ton (50 yuan per lot) |
| Delivery months | All 12 calendar months |
| Trading hours | Day session plus a night session (opening Sunday–Thursday evenings) that overlaps with LME hours |
| Price limit | Daily limit (typically in the low single-digit percent range, adjustable by the exchange) |
| Settlement | Physical delivery against registered warehouse warrants |
Two practical notes. First, the night session is a gift: it means SHFE copper reprices alongside London overnight, so you're not stuck holding a stale gap until the next morning the way you are with some other Chinese contracts. Second, always check the current margin and limit parameters on the exchange website before trading — SHFE adjusts them around holidays and delivery months, and the holiday adjustment is famously aggressive ahead of Chinese New Year and National Day week.
How Basis Trading Actually Works in Practice
You're not going to take delivery of 5-ton lots of copper. Neither do most Chinese participants in the futures leg of this trade. Basis trading for a directional trader boils down to using the spot-futures relationship as a filter and timing signal for outright futures positions.
The cash-and-carry backdrop
When the futures price sits well above spot plus the cost of carry (financing, storage, warrant fees), traders with access to capital and metal do the boring, profitable thing: buy spot (or strip warrants), sell futures, and pocket the spread. This selling caps the futures. Conversely, when spot trades at a fat premium and warrant stocks are thin, the reverse trade — buy warrants, short futures, deliver — becomes attractive, putting a floor under futures or even triggering a squeeze.
You don't need to execute these trades. You need to know they exist, because they tell you where the natural boundaries are. A front-month contract trading at a huge premium to spot with rising warrant stocks is a mean-reversion candidate. A front month with shrinking warrants and a widening spot premium is a squeeze candidate, and shorting it because your LME chart looks bearish is how accounts die.
A practical filter you can apply this week
- Setup: You have a directional view on copper from macro or LME price action.
- Filter 1 — warrant trend: Are SHFE warrant stocks rising or falling over the past two to four weeks? Falling stocks + rising spot premium = bullish domestic confirmation. Rising stocks + spot discount = bearish confirmation.
- Filter 2 — front-month spread: Compare the near delivery month to the next one. A persistently strengthening backwardation in the front months supports longs; a softening structure warns shorts are being fed with deliverable metal.
- Execution: Take your outright SHFE position only when the domestic signals agree with your macro view. When they conflict, either size down or stand aside — the domestic physical market usually wins in the delivery month.
This is the same discipline that separates traders who survived China's 2021 thermal coal episode — when policy intervention and physical tightness collided and volatility went vertical — from those who learned about exchange risk controls the expensive way. Physical reality plus policy awareness beats a clean chart setup, every time, in Chinese commodity futures.
The Import Arbitrage: The Other Half of the Puzzle
One more relationship to track: the SHFE–LME arbitrage. China imports a large share of the world's copper, so the relative price of the two exchanges drives physical flows.
When SHFE copper is expensive relative to LME (after converting currency and adjusting for VAT and import costs), imports become profitable, metal flows in, and the SHFE premium gets competed away. When SHFE is cheap relative to LME, exports of scrap and semis increase and imports stall, tightening the domestic market. Traders watch the "import loss/profit" number — widely published by SMM and similar data providers — as a gauge of whether the domestic market is about to get flooded or starved.
For your trading, this means: a strong LME rally that leaves SHFE behind may simply reflect an import loss that's about to pull metal into China and cap the domestic price. Conversely, SHFE strength with a widening import profit can signal genuine domestic tightness that will eventually drag LME higher. Same logic as the basis, just one border wider.
Where to Find the Data (Free)
- SHFE website: daily warehouse warrant stock by delivery location, plus delivery month settlement data.
- SMM (Shanghai Metals Market): Yangtze spot copper prices, spot premiums over the SHFE active contract, import arbitrage calculations, and inventory across social/bonded warehouses.
- Exchange monthly reports: delivery volumes by contract, which show you whether a squeeze actually forced physical settlement.
Build a simple daily routine: log warrant stocks, the spot premium, the import arb, and front-month spreads. Within a month you'll start seeing the rhythm — and you'll notice that most of the big SHFE-specific moves were visible in these numbers days before they hit the price chart.
Putting It Into Your System
If you trade rebar or iron ore on the Dalian and Shanghai exchanges, none of this framework is new to you — warrant stocks and basis work the same way across Chinese commodity futures, from steel to zinc. Copper is simply the cleanest laboratory because the metal is globally priced, the data is high quality, and the arbitrage boundaries are tight.
The honest caveat: none of this is a guaranteed edge. Basis signals fail, squeezes resolve unexpectedly, and policy interventions can override any physical logic overnight. What this framework gives you is a context layer — a way to avoid fighting the delivery machine and to size up only when macro and micro agree. That's exactly the kind of edge worth stress-testing.
And that test is best done on real data. If you want to see how your copper or steel logic holds up against actual SHFE price action and risk management, you can run your system through a real-data China futures evaluation at XS Select, starting from $29. No promises about the outcome — just a realistic environment to find out whether your basis discipline survives contact with the market.
Trade the metal, but respect the warrants. In China's copper market, the paper follows the physical — not the other way around.