← Back to Blog · 2026-09-16 · 7 min read · Market Preview

You've done your chart work on rebar. Trend is clean, entry is set. Then Monday morning, price gaps against you and you have no idea why. You dig around and find it: a weekly inventory report came out, warehouse stocks fell more than expected, and the physical market repriced while you were watching a 15-minute chart.

This happens to almost every trader who comes to Chinese commodity futures from a pure technical background. The Chinese futures market is more tightly connected to physical delivery logistics than most Western retail traders realize, and two pieces of weekly data sit at the heart of it: warehouse warrants and inventory surveys. If you trade rebar, iron ore, copper, or thermal coal on the Shanghai Futures Exchange (SHFE), Dalian Commodity Exchange (DCE), or Zhengzhou Commodity Exchange (ZCE), you need a weekly routine around them. This article gives you one.

What Warehouse Warrants Actually Are (and Why They Move Prices)

A warehouse warrant in the Chinese system is a document certifying that a specific quantity and grade of a commodity is physically stored in an exchange-designated delivery warehouse. Registered warrants are the deliverable supply against futures contracts. Think of them as the physical backstop of the futures price.

Why should a retail trader who never intends to make or take delivery care? Because the relationship between registered warrants and open interest tells you how tight — or how loose — the deliverable picture really is.

• Low warrants + high open interest near delivery months = potential squeeze conditions. Shorts who plan to deliver may struggle to source warrants, and longs know it.
• Surging warrants = someone is registering stock to deliver, which often signals producers or merchants locking in sales. That's a bearish supply signal into the contract month.
• Sudden warrant cancellations = stock being pulled out of the deliverable pool, often to be sold in the spot market or re-registered elsewhere. A large cancellation spike is one of the classic precursors to a delivery-month squeeze in Chinese metals.

None of this is theoretical. The 2021 thermal coal rally is the textbook case: deliverable supply was thin relative to positioning, spot coal was extremely tight, and futures prices roughly tripled before regulators stepped in with intervention measures. Traders who only looked at price charts were blindsided by how the physical delivery mechanics amplified the move. The 2020 oil crash taught the same lesson in reverse — when storage fills up, the futures curve and the physical reality can detach violently from anything your technicals suggest.

Your Weekly Data Calendar: What Drops, When

Here's the practical part. Build your week around these releases.

Exchange warrant data

SHFE publishes registered warrant data daily, with a fuller weekly warrant report typically released at the end of each trading week. DCE and ZCE also publish daily registered warrant (delivery) data for their contracts. The key numbers to log every week:

• Total registered warrants for each contract you trade
• Effective vs. standard warrants (effective warrants can be used for delivery; watch the conversion flow)
• Week-over-week change — the direction matters more than the level

Social inventory surveys

For steel and iron ore specifically, weekly inventory surveys from industry data providers like Mysteel are the market's heartbeat. They typically cover:

• Rebar social inventory — steel in traders' warehouses, released weekly (usually Thursday/Friday)
• Mills' inventory — unsold stock at steel mills
• Iron ore port stocks — inventory at Chinese ports, a critical gauge of ore availability
• Daily crude steel output and rebar spot prices — context for whether inventory changes are demand-driven or supply-driven

A falling rebar social inventory during the construction season with rising spot prices is the classic bullish confirmation. Rising mill inventory with falling output is a warning that mills are losing pricing power. These are simple reads, but they discipline you into checking the physical story before every trade.

Reading the Inventory Cycle Like a Local

Chinese steel and construction commodities follow a seasonal inventory rhythm that's well understood domestically but routinely surprises overseas traders. The rough pattern:

• Winter buildup (roughly November–February): Construction slows, traders accumulate stock ahead of spring. Rising inventory here is normal and not bearish by itself.
• Spring destocking (roughly March–May): The "Golden March, Silver April" construction season. The key metric is the rate of destocking versus the seasonal average. Fast destocking + firm spot prices = bullish. Slow destocking even with falling prices = demand is weak, and rallies are suspect.
• Summer: Rainy season in the south, demand softens, inventory often plateaus or rebuilds slightly. Range conditions dominate.
• Autumn restock window: A second, smaller demand push before winter. Watch whether mills restock raw materials (iron ore, coking coal) aggressively or cautiously.

The mistake traders make is reading inventory levels instead of inventory changes relative to season. A warehouse full of rebar in January means little. The same level in April, with destocking stalling, means the spring rally thesis is dead.

Three Warrant Signals Worth Acting On

Beyond the seasonal cycle, here are three specific warrant behaviors that reward weekly monitoring.

1. The cancellation spike

When a large chunk of registered warrants is cancelled in a single week — especially in metals like copper, zinc, or aluminum — it frequently precedes a squeeze in the nearby contract. The logic: someone is pulling deliverable stock, and they usually have a reason. You don't need to predict the squeeze; you just need to avoid being aggressively short the front month when cancellations spike and open interest stays elevated.

2. Warrant growth into delivery

If warrants rise steadily week after week into a contract's delivery window, sellers are preparing to deliver. That's often a cap on the nearby contract's upside and can signal that spot sellers see current futures prices as attractive. Combine this with a weakening basis (futures trading at a premium to spot) and you have a mean-reversion setup on the short side of the calendar structure.

3. Warrant-to-open-interest ratio

A crude but useful heuristic: compare registered warrants to open interest in the nearest actively traded or delivery month. When deliverable supply covers only a small fraction of outstanding positions, the market is structurally vulnerable to squeezes — longs hold the option, shorts hold the obligation. This doesn't mean buy blindly; it means position sizing and stop placement should account for gap risk in the front month.

Know Your Instruments: Contract Specs That Matter

None of this analysis matters if you don't know exactly what you're trading. Here's a quick reference for the contracts most tied to warehouse and inventory data:

Two practical notes. First, iron ore's 100-ton lot size means each tick is meaningful — a ¥10/ton move is ¥1,000 per lot, so your risk per trade scales differently than in rebar. Second, always check current exchange specifications and margin schedules before trading; exchanges adjust margins and position limits around holidays and delivery months, and those changes themselves can trigger positioning shifts.

Also note the night session. SHFE and DCE metals and industrial contracts trade a night session aligned with London and US hours, which means international moves in dollar commodities feed directly into Chinese opens. Your weekly warrant and inventory read should be combined with an awareness of what LME and Singapore iron ore swaps did overnight.

A Weekly Checklist You Can Actually Run

Here's the routine I'd suggest — it takes 30–45 minutes, ideally on the weekend before the Monday open:

• Log warrant changes for every contract you trade: total registered warrants, week-over-week change, any cancellation spikes.
• Log inventory changes: rebar social inventory and mill inventory, iron ore port stocks, versus the seasonal average trend.
• Check the basis: compare front-month futures to published spot prices for rebar and iron ore. A widening premium with rising warrants is a warning; a discount with fast destocking is support.
• Scan policy headlines: China's commodity markets respond quickly to policy signals — production restrictions, stimulus measures, exchange margin adjustments. Inventory and warrant data tell you the physical story; policy tells you which story the market will trade.
• Write one sentence per contract summarizing the physical picture: "Rebar destocking on pace, warrants flat, basis firm — bias long dips." If you can't write that sentence, you're not ready to size up.

This won't make you right every week. It will stop you from being wrong for reasons you didn't know existed — which, for most traders entering Chinese commodity futures, is the difference between a fixable losing trade and a mystery gap through your stop.

Put the Routine to Work

Reading about warrant cycles is one thing; executing a disciplined weekly process against live Chinese market data is another. The honest way to find out whether your framework holds up is to run it against real price action under real constraints — fixed risk, defined evaluation windows, no do-overs. That's exactly what we built XS Select for: a China futures evaluation where you can test your system on real-data Chinese commodity contracts, starting from $29. No promises about outcomes — just a clean environment to see if your weekly routine survives contact with the market.

The traders who do well in China's futures markets aren't the ones with the fanciest charts. They're the ones who know what's sitting in the warehouses.