Life has gotten harder lately for US-listed crypto miners.

At the close of US trading on October 14, 2026, MARA Holdings, once the biggest name in crypto mining, finished at $8.23, down 9.66% on the day. Over the past four weeks the stock has lost 26.78%, and stretched out to a full year, it is down 63.97%.

A day earlier, on October 13, fellow miner Cipher Digital announced an $850 million zero-coupon convertible note offering. Rather than steadying sentiment, the news sent the stock down as much as 15% intraday.

And on October 9, just days before that, Morgan Stanley cut price targets on four miners at once: MARA, Riot, Galaxy and Cipher. Its reasoning was blunt: the borrowing environment for miners building AI businesses has tightened.

The consensus used to be that miners sitting on large blocks of electricity were natural candidates to pivot into AI computing power. By this autumn, that view has changed.

Borrowing to Pivot, and Watching the Stock Fall First

The market's rejection of Cipher's latest note offering is easy to trace.

On October 13, Cipher laid out plans for $850 million in zero-coupon convertible notes due November 2032, with a $150 million upsize option that could take the total to $1 billion. Pricing was completed on October 14, with a conversion price of $15.31, a 35% premium to the prior day's close of $11.34.

On paper, the terms look attractive: no regular interest payments, and a large slug of cash upfront. The question is why the company suddenly needed that much money.

The investor presentation Cipher filed with the SEC on October 13 provides the answer. Barber Lake, its flagship AI data center project, has run over budget. Originally pegged at $2.157 billion, the project has been revised to between $2.941 billion and $2.966 billion, an increase of more than 36%. The company attributes the jump to new design changes requested by its tenant, Fluidstack.

That puts the situation in plain view: a major customer revised the design, construction costs rose sharply, and Cipher has to front the first $359.3 million of the overrun itself, with the tenant reimbursing only half of anything beyond that over a 20-year lease. Lacking that cash on hand, the company had to go to the market.

Convertible note buyers care about where the share price goes. Faced with a project whose costs are slipping and a company borrowing heavily to cover the gap, the market voted with its feet, sending the stock down 15% intraday on the day of the announcement.

Tens of Billions Short, With Deliveries Lagging

Cipher's problem is a microcosm of the entire miner-to-AI cohort.

Investment firm VanEck ran the numbers in a June report: to finish all the AI infrastructure miners have already announced, the industry faces a near-term funding gap of roughly $50 billion, with long-term capital needs approaching $221 billion.

Drawing on VanEck's data, consultancy BlocksBridge Consulting put figures on individual leaders: IREN faces a $21.1 billion funding gap, Riot is short $7.2 billion, and HIVE $4.6 billion.

At the same time, the cost of outside money is rising. Take IREN: in June it secured $3.65 billion in GPU financing at a blended rate of 6%. Two months later, a separate $2.4 billion deal carried a fixed rate of 9%. The two financings funded different projects, so the rates are not directly comparable, but a three-percentage-point spread is enough to show lenders are now repricing deal by deal.

Lenders have turned cautious because what they scrutinize has changed. Last year, the focus was how much power capacity a miner had locked up and how many letters of intent it had signed. This year, it is actual construction progress. According to VanEck's mid-year tally, the industry has delivered only about 25% of the capacity it has already contracted out.

The blueprints are ambitious. The number of halls actually handed over on site is not.

The Core Business Is Losing Money, and Mining Pools Are Shutting Down

If pivoting to AI is this expensive, why not simply keep mining bitcoin?

Because in the first half of this year, the core business was not making money.

On October 13, 2026, Binance, the world's largest crypto exchange, announced it would shut down its mining pool business on November 10, including Pool Savings, cloud mining and its transaction accelerator. After that date, miners submitting hashrate will no longer receive rewards. The Binance pool launched in April 2020 and ran for more than six years without incident.

Officially, the shutdown was attributed to a routine product review, but the backdrop is not hard to read: the economics of mining have been hard to make work.

CoinShares data shows the weighted average cash cost for listed miners to produce one bitcoin was roughly $80,000 in the fourth quarter of 2025, falling to about $75,500 by the second quarter of 2026. When bitcoin dropped to $69,000 in March this year, against production costs of about $88,000 at the time, miners were losing roughly $19,000 on every coin they mined. Only recently, with bitcoin back above $80,000 and hashprice recovering to around $40, has the industry edged back toward breakeven.

It was precisely because the core business stayed in the red through the first half that miners had to look to AI for a second growth curve. The awkward reality is that the old business cannot supply ammunition for the new one. It has become a drag instead.

Some Are Holding On, Others Cut Their Losses First

Faced with industry-wide funding pressure, miners have split into two clearly different camps.

The first is to hold the line, as MARA has done. Unwilling to give up its bitcoin position, MARA pledged 54% of its holdings as collateral and took on $600 million in new borrowing, pushing its debt load to 70.8% of the company's total market capitalization.

The result of leaning on leverage is being held hostage by interest costs. In Morgan Stanley's October 9 note, MARA's price target was cut to $10 with an "underweight" rating, ranking last among the four miners covered.

Bitdeer took the other route: don't bet on a price rebound, cut the position and protect liquidity.

Since taking investment from Tether in 2024, Bitdeer has also topped up its war chest through convertible notes, with total borrowings of about $1.9 billion as of the end of the first quarter this year, prompting concern in capital markets about the size of its debt.

But compared with peers still wavering, it made an unusual and highly pragmatic call: in February it liquidated its entire self-mined bitcoin holdings, hitting zero on February 20, and has since sold every newly mined coin on the spot market, converting everything into cash.

During the industry's low point in the first half, when mining was broadly unprofitable, clinging to a hold-the-coin conviction tended to leave companies crushed by interest payments. Bitdeer's move cut off the continuing bleed from the old business and locked all realized cash into AI infrastructure.

That decisiveness has translated into a real lead on delivery. In an industry stuck at a roughly 25% delivery rate, Bitdeer's 180-megawatt AI data center at Tydal in Norway has stayed on schedule, with phase one targeted for delivery this December. More telling: by April this year, annualized recurring revenue (ARR) from its AI cloud business had reached about $69 million.

Dragged down by the broader selloff across mining stocks, Bitdeer's shares slipped to $8.40 on October 15. But the underlying situations are not the same. Peers are being pulled into a liquidity swamp by legacy baggage, while Bitdeer moved quickly to switch tracks on a capital-heavy business and has become one of the few miners actually seeing money come back from AI.

Miners have gone from prized holders of power resources to companies facing a share price reset, and the shift is really a change in logic. The market once awarded miners high valuations for something scarce in the AI era: power allocations and grand contracts on paper. As projects break ground, investors are now doing the math against actual construction progress, leverage ratios and interest expense.

With a $50 billion near-term gap across the industry, a loss-making legacy business and a capital-intensive new one, and funding costs climbing, the market is waiting for miners to prove themselves again with delivery they can show in hard numbers.