Quantinuum Files for a $20B IPO While IonQ Crosses $130M in Revenue: Quantum Goes From Lab to Public Capital

For most of the last decade, quantum computing was a venture story dressed in physics-department clothing. The funding rounds were enormous, the timelines were vague, and the public-market reference points were almost entirely speculative. The last six weeks have rewritten that script. Quantinuum has confidentially filed an S-1 with the SEC, with reported expectations of a valuation north of $20 billion. IonQ has reported $61.89 million in Q4 revenue and crossed $130 million for the full year. PsiQuantum is sitting at a $7 billion private valuation with $1 billion in fresh capital. The category is no longer a science project. It is a capital-formation story unfolding in both the public and private markets at the same time.

This week we want to walk through what just happened, why it matters for how the secondary market is pricing private quantum names, and how investors should think about the gap between the public quantum tape and the late-stage private quantum cap tables.

The Quantinuum filing changes the public reference set

On April 22, Honeywell (NASDAQ: HON) publicly disclosed that Quantinuum, its majority-owned trapped-ion quantum subsidiary, had confidentially submitted a draft Form S-1 to the SEC on February 17, 2026. Reuters and The Quantum Insider covered the disclosure the same day, and follow-up reporting from GuruFocus and Investing.com cited an expected listing valuation above $20 billion, roughly double the $10 billion pre-money mark Honeywell stamped on the company in its September 2025 capital raise.

Quantinuum is the most commercially advanced trapped-ion player by funding history. It has now raised approximately $900 million across 2024 and 2025 alone, including a $300 million round at a $5 billion valuation in early 2024 led by JPMorgan Chase, and the $600 million Honeywell-led round at $10 billion pre-money last September. If the company prices its IPO anywhere near the $20 billion zone, it will roughly double the public-market float available to investors who want gate-based, fault-tolerance-ambitious quantum exposure that is not IonQ.

The filing also lands at a delicate moment for the quantum public tape. IonQ has just crossed a credibility threshold most observers thought would take another two or three years.

IonQ becomes the first $100M-revenue public quantum company

On April 15, IonQ (NYSE: IONQ) reported Q4 2025 revenue of $61.89 million, a 429% year-over-year increase that beat consensus by 53%, and full-year 2025 revenue of $130.02 million. As 24/7 Wall Street noted, that makes IonQ the first publicly traded quantum company to clear $100 million in annual GAAP revenue. Management guided 2026 revenue to $225 to $245 million and is in the process of acquiring SkyWater Technology to deepen its manufacturing footprint.

D-Wave Quantum (NYSE: QBTS), meanwhile, posted Q4 bookings of $13.4 million, up 471% sequentially, and disclosed that 2026 year-to-date bookings have already exceeded $32.8 million, anchored by a $20 million Florida Atlantic University system sale and a $10 million quantum-computing-as-a-service contract with a Fortune 100 buyer. Rigetti has launched its 108-qubit system and is targeting more than 1,000 qubits by year-end 2027.

What is interesting is not just the absolute numbers — they are still small in the context of public-market multi-billion-dollar valuations — but the slope. Quantum revenue at the public players is now compounding at rates that are starting to look more like enterprise software than basic research, even if the absolute bases are still modest. That has direct implications for how the secondary market should be pricing private comparables.

The private market is where the real concentration sits

Behind the public names, the private quantum cap table is where most of the long-duration capital has actually accumulated. According to New Market Pitch's March 2026 funding-trends review, quantum computing startups raised $4.53 billion across 32 deals in 2025 — a 374% year-over-year jump and the largest single year in the category's history. Three numbers anchor the league table:

• PsiQuantum — $1 billion Series E in September 2025 at a $7 billion valuation, led by BlackRock, Temasek and Baillie Gifford with new participation from NVIDIA's NVentures, Ribbit Capital, Macquarie Capital, the Qatar Investment Authority, Adage, Counterpoint Global (Morgan Stanley) and 1789 Capital. The company is targeting a million-qubit, fault-tolerant photonic system, with utility-scale sites in Brisbane and Chicago.
• Quantinuum — $600 million round (later expanded to $800 million) at a $10 billion pre-money valuation in September 2025, with the S-1 filing now public.
• IQM Quantum Computers — $360 million round in 2025 that crowned Europe's first quantum unicorn, on top of a separate $320 million raise at a $1 billion valuation noted by The Wall Street Journal.

The concentration is unusually tight. The top three private quantum deals captured roughly 48% of all 2025 capital. Trapped-ion (Quantinuum at $900 million across two years) and photonic (PsiQuantum at $1 billion in a single round) are absorbing the lion's share of the late-stage dollars, while superconducting hardware spreads its $2.4 billion of cumulative funding across more than 20 names.

What the public-private spread is telling us

Once Quantinuum becomes a publicly listed reference, three secondary-market dynamics become observable in real time:

1. Architecture-specific repricing. Today, the public market has effectively one trapped-ion proxy (IonQ) and three superconducting/annealing-adjacent proxies (Rigetti, D-Wave, plus the recently public Xanadu on the photonic side). Adding Quantinuum gives the buy side a second trapped-ion comparable with very different revenue mix and balance sheet. That is the kind of new data point that typically forces a wave of repricing on Forge, Hiive and EquityZen for late-stage private names whose pitch decks rely on those comparables.

2. NVIDIA's strategic-investor halo. NVIDIA's NVentures arm participated in four major quantum rounds in 2025 alone — PsiQuantum, Quantinuum, QuEra and SEEQC — making it the single most important strategic capital source in the category. As The Quantum Insider and global news services have documented, NVIDIA's presence on a cap table is now functioning as a quasi-rating event in the private market, both because of the implicit GPU-QPU integration roadmap and because of the signal it sends to other anchor investors. The challenge for secondary buyers is separating the NVIDIA halo premium from the underlying technical thesis on each architecture.

3. The fault-tolerance milestone calendar. Nearly every 2025 mega-round was explicitly underwritten to fault-tolerant systems rather than near-term NISQ workloads. PsiQuantum has reaffirmed a 2027 target for its Brisbane million-qubit machine, with Chicago following in 2028, per The Wall Street Journal's September 2025 reporting. IonQ has guided to a 256-qubit target for late 2026 and a commercial-workload window of 2028 to 2030. Those calendars are now on a public stopwatch — the moment Quantinuum's S-1 goes effective and the prospectus is public, every milestone slip across the category becomes immediately re-priceable.

The education frame for our community

Quantum Pre-IPO is one of the four research verticals we cover in the AdValorem education library, alongside AI Robotics, the Newchip Warrant Portfolio case study, and the Accelerator Warrant Enforcement Platform. The reason we frame it as a research topic rather than a single trade is exactly the dynamic above: the category is still narrow at the top, the public reference set is still being built in real time, and the gap between architecture-specific theses (trapped-ion, photonic, superconducting, neutral-atom, annealing) is wider than the gap between any two AI infrastructure plays.

For investors trying to make sense of where we are: 2026 is the year quantum becomes a comparables exercise, not a thesis exercise. The public tape will give you live multiples on revenue and bookings. The private tape will give you architecture-specific scarcity premiums. The educational lift is in learning to read both at the same time — and in recognizing that the most informative event of the next twelve months is probably the moment the Quantinuum prospectus goes from confidential to public.

That is the reading list we are going to be working through at gp.advalorem.io and on our Substack over the coming weeks, and it is the conversation we are hosting in our Discord and at our community dinners.