Quantinuum's computers hold single charged atoms in place with electric fields and work with them using lasers. Its Helios machine has 98 of these trapped-ion qubits. In June 2026 quantum computing was moving from physics labs toward real customers, and investors were eager for a pure play backed by a big industrial name. Honeywell owned a large stake. The company listed on Nasdaq that month at a valuation of about $17.6 billion.

Hardware Meets Software

Quantinuum was formed in 2021 by combining Honeywell Quantum Solutions with Cambridge Quantum, a software company. Both had started in 2014. The bet was that one company owning both the machines and the software would reach useful quantum computing first. It built the H-Series trapped-ion computers and software such as TKET and InQuanto. Its research teams published work on error correction and logical qubits. It has bases in Broomfield, Colorado, and Cambridge, England.

Sixty Dollars a Share

Quantinuum sold 28 million shares at $60 and listed on the Nasdaq Global Market as QNT in June 2026. The shares opened at $68. Rajeeb Hazra, chief executive since 2023, led the company to market. Honeywell kept about 48 percent of the voting power. In May 2026 it agreed to terms with the Commerce Department for up to $100 million in CHIPS Act funding, paid for in stock. It trades on Nasdaq.

Cover: Landscape with a Rainbow, Charles François Daubigny. Art Institute of Chicago, public domain. Chosen for a rainbow (light split into its states).