Bitmain has confirmed to all suppliers and retailers a ongoing delay on shipments for all models affecting June Batches and later.

The reason is explained as follows:

” Dear Antminer users: Recently, the company’s operation and management have been subject to external interference. Some product orders originally scheduled to be delivered at the end of June 2020 and later cannot be delivered on time.  We are actively seeking solutions to achieve product delivery as soon as possible.  For product orders that are delayed by more than 10 days due to this impact, we will provide certain compensation.

We apologize for the inconvenience, and sincerely thank you for your understanding and support.

Antminer sales team

July 20, 2020 “

The whole story can be read on bitcoin.com

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UPDATE 9/30/2020:

Bitmain announced that it will start shipping the Z15 Batches from June, Juli, August and September starting at 15th of October:

“We are sorry to inform you that the company’s daily operations have been affected by some unexpected external factors. The delivery time of the Antminer Z15 (June, July, August, and September batches) will be further delayed to be delivered from October 15 to November 10.”