14.4k S21 Pros for MB-5 at Lake Mariner
Company: TeraWulf - Project: Lake Mariner Anthropic AI Factory
What the later record shows
Delivered on time · happened March 31, 2025
The S21 Pro fleet grew from 12,900 units at December 31, 2024 to 26,800 units at March 31, 2025. That is about 13,900 more, close to the planned 14.4k, received within Q1 2025. The passages do not explicitly tie these units to MB-5.
“Bitmain S19k Pro 4,200 Bitmain S21 8,300 Bitmain S21 Pro 12,900 62,000”
2025-03-02 · TeraWulf 10-K filed 2025-03-03 View cached copy (2026-08-31)Live source ↗
“Bitmain S19k Pro 4,000 Bitmain S21 8,100 Bitmain S21 Pro 26,800 73,200”
2025-05-08 · TeraWulf 10-Q filed 2025-05-09 View cached copy (2026-08-31)Live source ↗
Checked October 9, 2026 against filings, releases and reporting published after the claim was made. Quotes are verbatim from the linked documents.
The claim, verbatim
In Q1 2025 TeraWulf plans to receive an additional 14.4k S21 Pro miners to fully utilize MB-5 at Lake Mariner.
Source (primary)
Nautilus Sale Announcement (IR page (investors.terawulf.com), ir_presentation)
View cached copy (2026-10-06)Live source ↗
Quote: “In Q1 2025, WULF plans to receive an additional 14.4k S21 Pros to fully utilize MB-5 at Lake Mariner”
How we checked this
Checked on October 13, 2026. The cited source supports every part of this claim.
The deck states this plan directly.
Confirmed in the source:
- In Q1 2025 TeraWulf plans to receive an additional 14.4k S21 Pro miners
- The miners are intended to fully utilize MB-5 at Lake Mariner
What we did: Read our cached copy of IR page (investors.terawulf.com) (https://d1io3yog0oux5.cloudfront.net/_26c9692236622f11a71632d61560402c/terawulf/db/2396/23300/pdf/WULF_Nautilus_Sale_Announcement_Deck_%2810-03-24%29vF.pdf) in full (14,394 characters, retrieved October 6, 2026) and checked each assertion in the claim against it.
Additional evidence
confirms Nautilus Sale Announcement
Quote: “In Q1 2025, WULF plans to receive an additional 14.4k S21 Pros to fully utilize MB-5 at Lake Mariner”
confirms TeraWulf 10-K filed 2025-03-03
Quote: “Bitmain S19k Pro 4,200 Bitmain S21 8,300 Bitmain S21 Pro 12,900 62,000”
confirms TeraWulf 10-Q filed 2025-05-09
Quote: “Bitmain S19k Pro 4,000 Bitmain S21 8,100 Bitmain S21 Pro 26,800 73,200”