Checklist summary
- Crypto mining companies earn block rewards and fees; their biggest costs are electricity and machines that wear out and go out of date.
- Every Bitcoin halving cuts the reward per block in half, squeezing miners with high costs.
- Owning shares in a miner adds company risks (debt, dilution, power contracts) on top of crypto price risk.
Crypto mining companies are businesses that run large fleets of specialised computers to secure proof-of-work blockchains, above all Bitcoin, and get paid in newly created coins plus transaction fees. Some are listed on stock exchanges, which means beginners can come across them as shares as well as through crypto. This guide explains the business model without naming or recommending any company.
What mining actually is
On Bitcoin, transfers are bundled into blocks roughly every ten minutes. To add a block, a miner must find a number that gives the block a cryptographic fingerprint below a target, which can only be done by trying enormous numbers of guesses. The combined guessing power of the network is called its hashrate. The network adjusts the difficulty about every two weeks so that blocks keep arriving at the same pace, however many machines are switched on. The winner of each block receives the block reward, currently 3.125 BTC, plus the fees in that block. For the basics of the network itself, see what Bitcoin is.
Because difficulty rises as more machines join, a single miner's share of the rewards depends on its share of total hashrate. A company that doubles its fleet while the whole network also doubles earns roughly the same number of coins as before.
How crypto mining companies make money
Self-mining
The core model: the company owns machines, runs them in its own or rented facilities, and keeps the bitcoin it earns. It may sell coins regularly to pay bills or hold some as a treasury asset, which increases its exposure to the bitcoin price.
Hosting
Some firms rent out space, power and maintenance to other miners' machines for a fee. This gives steadier income that depends less on the bitcoin price, but margins are thinner and customers can leave.
Selling computing power or capacity
Some miners sell hashrate in advance, and in recent years several have tried to repurpose power connections and buildings for data-centre work such as high-performance computing. These moves change the business and bring different risks, including large new capital spending.
Where the money goes: costs
- Electricity is usually the largest running cost. Miners look for cheap, reliable power and often sign long-term contracts. Some earn extra by switching off at peak times and selling power back to the grid.
- Machines. Mining uses specialised chips called ASICs. New generations are more energy-efficient, so older machines become unprofitable and must be replaced: a cost that shows up as depreciation.
- Facilities and cooling, from buildings and transformers to staff and maintenance.
- Financing: loans or equipment financing taken on to expand, which must be repaid whatever the bitcoin price does.
A simplified, illustrative example of why efficiency matters: a machine drawing 3.5 kilowatts runs for 24 hours and uses 84 kWh a day. At $0.05 per kWh that is $4.20 a day; at $0.08 it is $6.72. If that machine earns $8.00 of bitcoin a day, its margin over electricity is $3.80 at the cheaper rate but only $1.28 at the dearer one, before any other cost. Halve that reward to $4.00 a day and both operators lose money on electricity alone, the dearer one by $2.72 every day the machine runs.
Why the halving is a stress test
Roughly every four years the block reward is cut in half; the last cut, in April 2024, took it from 6.25 to 3.125 BTC. Overnight, every miner's coin income per unit of hashrate falls by about half, unless the price or fees rise to compensate. Companies with expensive power, old machines or heavy debt are hit hardest. The next halving is expected around 2028. It is known years ahead, so a well-run miner plans for it; how it plans is one of the most important things to look for in its reports.
The main risks for beginners to understand
- Bitcoin price risk. Revenue is earned in bitcoin, so a price fall hits income directly, often more sharply than the fall in the coin itself because costs stay fixed.
- Network competition. If total hashrate rises faster than a company's own fleet, its share of rewards shrinks.
- Power and regulation. Energy prices, grid rules, local opposition and changes in how countries treat mining can all hit costs or shut sites.
- Debt. Loans taken in good times can become dangerous when the price and reward fall together.
- Dilution. Listed miners often raise money by issuing new shares, which reduces existing shareholders' ownership stake.
- Strategy shifts. Moves into new businesses may succeed or fail, and they make the company harder to compare with its past.
How to read a mining company's reports
Listed miners publish regular results, and many publish monthly production updates. Our general guide on how to research stocks covers annual and quarterly reports; for miners, focus on these extra figures:
| Figure | What it tells you |
|---|---|
| Hashrate (EH/s) and share of the network | Scale, and whether the company is keeping pace with competitors |
| Fleet efficiency (J/TH) | Energy per unit of work; lower means cheaper to run |
| Bitcoin produced per month | Actual output, which should be compared with hashrate growth |
| Cost to mine one bitcoin | Check whether it includes only power or also depreciation and overheads |
| Power price and contract terms | How stable costs will be, and for how long |
| Bitcoin held versus sold | How exposed the company is to the price beyond its mining |
| Debt and share issuance | How growth is being financed and who bears the cost |
Watch the definitions. "Cost per bitcoin" figures that leave out depreciation and interest can make a miner look far cheaper than it is. Compare the company's claims across several periods and against its own cash-flow statement.
Crypto mining companies versus holding bitcoin
A miner's share is not the same as owning bitcoin. It adds operating risk, management decisions, debt and dilution, and it trades only during stock market hours. In strong markets miners can rise faster than bitcoin; in weak ones they can fall further. Anyone considering either should first understand how crypto works and the costs covered in our fees guide.
Beginner questions, answered
Do crypto mining companies only mine bitcoin?
Most listed miners focus on Bitcoin because it is the largest proof-of-work network. Some mine other proof-of-work coins, offer hosting, or use their power sites for other data-centre work.
Why do mining shares move more than bitcoin?
Miners have large fixed costs, so a change in the bitcoin price has an outsized effect on their profits. Debt and share issuance can magnify moves further.
Is cloud mining the same as investing in a mining company?
No. Cloud mining contracts promise a share of mining output for an upfront fee and are often unregulated; many have turned out to be scams. A listed mining company's shares trade on a regulated exchange and publish audited accounts.
Sources
- Bitcoin Core documentation: difficulty adjustment and subsidy schedule
- US Securities and Exchange Commission, EDGAR company filings guidance