Jim Cramer says he plans to sell all Bitcoin, citing quantum computing risk

Jim Cramer said he plans to sell his entire Bitcoin position, arguing that quantum computing could break Bitcoin’s security in about three years. His remarks came as concerns around post-quantum cryptography resurfaced in the crypto market. On July 30, IBM Chairman and Chief Executive Officer Arvind Krishna said in an interview that quantum computing could pose a challenge to modern cryptography within the next three to four years. Separately, a March paper from Google Quantum AI estimated that fewer than 500,000 physical qubits may be needed to break the relevant cryptography, roughly one-twentieth of earlier projections. Even so, current quantum systems remain far smaller, with physical qubit counts still in the hundreds to thousands, while the number of highly reliable logical qubits is limited. Researchers also estimate that about 30% of Bitcoin’s supply, or 6 million to 7 million BTC, sits in addresses with exposed public keys. The remarks add to a long-running debate over how quickly quantum advances could become a practical threat to Bitcoin and broader cryptographic systems.