Quantum-computing startups raised only $420 million across 14 disclosed rounds in the first half of 2026, down 68 % from the $1.3 billion recorded in H1 2025, according to news.crunchbase.com.
The slowdown began in Q4 2025 when venture funds started re-pricing risk after IonQ and Rigetti shares fell 40 % on public markets despite posting record revenues. Sequoia Capital and Khosla Ventures, which led five of the seven mega-rounds above $100 million last year, told limited partners in March that they would cap new quantum bets at Series B until clearer commercial traction emerges, news.crunchbase.com reported. Corporate investors such as IBM Ventures and Quantinuum’s parent Honeywell kept cheques coming, but at median ticket sizes of $15 million versus $55 million a year earlier.
The retreat lands just as governments double down: the U.S. CHIPS and Science Act released a fresh $2.4 billion tranche for quantum research in May, and the EU’s Quantum Flagship added €1 billion in June. Public-market appetite remains intact—D-Wave’s stock is up 22 % since January—suggesting investors distinguish between early-stage technical risk and nearer-term revenue visibility. Comparable funding contractions hit AI chip startups in 2024 before a rebound once Nvidia’s earnings proved demand; quantum watchers are drawing parallels, per news.crunchbase.com.
Startups now have 12-18 months of runway to demonstrate fault-tolerant prototypes or risk down-rounds. PsiQuantum says its 1-million-qubit machine will tape-out at GlobalFoundries by Q3 2027, while Alpine Quantum Technologies targets a 256-logical-qubit demonstrator by March 2027. Investors will watch these milestones and the next quarterly 13-F filings to see whether Tiger Global and Fidelity re-enter, according to news.crunchbase.com.
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