Quantinuum has $925M on record. The latest round is a $600M Growth (September 2025). Size your own round against the evidence it must buy, not against the stage letter.
Key takeaways
- Round size should be derived from the evidence the next investor needs, not from the stage label.
- Named participants on a record tell you which funds write at this size and stage.
- Plan the raise timeline backwards from your cash-out date, with a third added for slippage.
Not every round gets a letter. Growth capital is negotiated against different evidence: retention, unit economics and a credible path to funding operations without the next round.
The record here belongs to Rajeeb Hazra, founder of Quantinuum (Broomfield, Colorado, United States).
| | | |---|---| | Founder | Rajeeb Hazra | | Company | Quantinuum (Broomfield, Colorado, United States) | | Total raised | $925M | | Latest round | Growth — $600M | | Round date | September 2025 | | Named participants on record | Quanta Computer, NVentures, QED Investors, JPMorganChase, Mitsui, Amgen |
This round is 65% of everything raised to date, so earlier rounds still shape the cap table.
The round size sets the next evidence bar. Investors size the following round against what this one was expected to buy. Write that expectation down before you sign.
Named participants signal the buyer pool. Quanta Computer, NVentures, QED Investors, JPMorganChase, Mitsui, Amgen are on record here. Funds with that profile are the realistic audience for a comparable raise.
Timing is data. The round closed in September 2025. Fundraises take longer than founders plan; count backwards from the date you need cash, not from the date you want a term sheet.
1. Write the two or three pieces of evidence your next round must show. 2. Cost out the months and headcount required to produce that evidence, then add a third for slippage. 3. Build the investor list from funds that have written cheques of this size at this stage, not from brand preference. 4. Ask each lead what they expect to see at the next round, and hold them to it in writing.
The letter on the round matters far less than whether the money buys the evidence the next buyer needs.
Frequently asked questions
- How much has Rajeeb Hazra raised for Quantinuum?
- Quantinuum has $925M in disclosed funding on record, most recently a $600M Growth in September 2025.
- Who invested in Quantinuum?
- Named participants on record include Quanta Computer, NVentures, QED Investors, JPMorganChase, Mitsui, Amgen. Records list participants, not allocations or terms.
- Where do these figures come from?
- Structured founder funding records: total raised, round stage, round amount, round date and named participants. They exclude valuation, terms and board composition.
