Shanghai Copper Premiums Turn Positive Again. Guangdong Just Emptied Its Warehouses.

By Siam Sukkhee Trading Co., Ltd — 2026-07-07 — copper cathode trading Asia

I watched the first half of 2026 happen to Shanghai copper cathode premiums. It wasn't pretty.

Deep discounts, then firmness, then discounts again. Around every contract rollover, supply gluts would hit a market already nervous about whether anyone downstream wanted to buy anything at all. Q1 felt like being trapped on a ship with a broken compass.

Then Guangdong started clearing its warehouses.

That's the turn. SMM's numbers showed South China social inventory dropping hard and fast, which meant spot premiums there climbed sharply. Suddenly you had a price spread between Guangdong and East China that actually meant something. Traders looked at that spread and did what traders do—they started moving metal from Shanghai and Jiangsu south to pocket the difference. Less cathode sitting in the East China warehouses. Shanghai premiums started climbing off their lows. It wasn't complicated, just real.

By early July, the #1 copper cathode spot price against the 2606 SHFE contract was trading somewhere between flat and 100 yuan per ton premium. Average was 50 yuan per ton, which is only 10 yuan up from the session before. Not dramatic stuff historically speaking. But when you've just crawled out of months where you were sitting on discounts, a positive premium feels like something shifted.

The numbers backed it. Shanghai region had 126,500 metric tons of social inventory by early July, down 7,700 tons week-on-week. Jiangsu was at 36,200 tons, down 5,000. Both regions were drawing down.

Actually, that's not quite right—I mean both were drawing down steadily, which matters.

When copper prices dropped recently, suppliers held their offers instead of chasing the market lower. That's a tell. When someone owns metal and won't sell into weakness, they think the floor is either right in front of them or already passed.

The second half is a different animal altogether

Be honest with yourself: this 50 yuan premium does not run forever. The next six months is going to be a tug-of-war, and SMM's framing is correct because it's the only framing that fits reality. Four separate things are pulling in four separate directions. The speed of social inventory draws. How hard the wire rod and fabricator shops actually buy. How much imported copper comes in and when. And the Shanghai-LME spread, which decides whether it makes sense to ship metal from offshore into China or not.

That last one.

That last one matters more than most traders give it credit for, and I mean properly matters, not just technically matters. In the first half of this year, Shanghai premiums weren't just about what the local market wanted to buy. They were about regional inventory gaps and whether the import window was open wide enough to pull in real tonnage. When the window was open, imports came and the relief valve worked. When it closed, tight domestic inventory couldn't restock fast enough and premiums spiked. When things swung the other way, domestic surplus pushed everything into discount territory. Shanghai-Guangdong spread became the signal people actually watched. More or less replaces Shanghai-Jiangsu as the market's way of reading things. Something like that happened gradually, but it happened.

Don't mistake the return to positive premiums for the market having solved anything. The structural tensions are still there. What happened is excess cleared, and premiums got room to move. That's all.

Whether it lasts depends on whether Guangdong keeps its warehouses lean and whether the cable and rod shops in Guangdong keep buying at the rates that drove this destocking in the first place. Neither is guaranteed. The question you should be asking is whether they happen together or whether one breaks first.

Tags: SHFE copper, SMM, copper cathode, SHFE copper cathode premiums 2026, Shanghai Guangdong copper arbitrage, copper spot premium H2 outlook