This market predicts which major technology company will achieve the most significant breakthrough in quantum computing by December 31, 2029. A "significant breakthrough" is defined as: 1. Development of a quantum computer with >1000 logical qubits, OR 2. First demonstration of quantum advantage for a commercially relevant problem, OR 3. Development of a quantum-resistant cryptography standard that becomes widely adopted. The breakthrough must be publicly announced and independently verified by at least two academic institutions.