Filed Pursuant to Rule 424(b)(3)
Registration No. 333-295256
SUPPLEMENT NO. 5 TO
PROSPECTUS OF XANADU QUANTUM TECHNOLOGIES LIMITED
This prospectus supplement
amends and supplements the prospectus dated May 1, 2026, as supplemented or amended from time to time (the “Prospectus”),
which forms a part of our Registration Statement on Form F-1 (Registration Statement No. 333-295256). This prospectus supplement is being
filed to update and supplement the information included or incorporated by reference in the Prospectus with the information contained
in our Report on Form 6-K, which was furnished to the Securities and Exchange Commission on October 19, 2026 (the “Form 6-K”).
Accordingly, we have attached the Form 6-K to this prospectus supplement.
This prospectus supplement
updates and supplements the information in the Prospectus and is not complete without and may not be delivered or utilized except in combination
with, the Prospectus, including any amendments or supplements thereto. This prospectus supplement should be read in conjunction with the
Prospectus and if there is any inconsistency between the information in the Prospectus and this prospectus supplement, you should rely
on the information in this prospectus supplement.
Our Class B Subordinate Voting
Shares are listed on the Nasdaq Global Market (“Nasdaq”) under the symbol “XNDU” and the Toronto Stock Exchange
(the “TSX”) under the symbol “XNDU.” On October 16, 2026, the last reported sales prices of the Class B Subordinate
Voting Shares on Nasdaq and the TSX were $3.04 and C$4.29 respectively.
Investing in our securities
involves a high degree of risk. You should review carefully the risks and uncertainties described under the heading “Risk Factors”
beginning on page 1 of the Annual Report and beginning on page 6 of the Prospectus, and under similar headings in any amendments or supplements
to the Prospectus.
None of the Securities and
Exchange Commission, any state securities commission or the securities commission or regulatory authority of any Canadian province or
territory has approved or disapproved of the securities offered by this prospectus supplement or the Prospectus or determined if the Prospectus
or this prospectus supplement is accurate or adequate. Any representation to the contrary is a criminal offense.
This Supplement No. 5 is dated October 19, 2026.
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 6-K
Report of Foreign Private Issuer
Pursuant to Rule 13A-16 or 15D-16
of the Securities Exchange Act of 1934
For the month of October 2026
Commission File Number: 001-43205
Xanadu Quantum Technologies Limited
(Translation of registrant’s name into English)
777 Bay Street, Suite 2400, Toronto, Ontario
M5G 2C8
(Address of principal executive offices)
Indicate by check mark whether the registrant files or will file annual
reports under cover of Form 20-F or Form 40-F.
Form 20-F ☒
Form 40-F ☐
INCORPORATION BY REFERENCE
This Report on Form 6-K, including Exhibit 99.1, is incorporated by
reference into the registrant’s registration statement on Form
S-8 (File No. 333-296231) (including any prospectuses forming a part of such registration statement) filed with the U.S. Securities
and Exchange Commission, to be a part thereof from the date on which this Report on Form 6-K is submitted, to the extent not superseded
by documents or reports subsequently filed or furnished.
Signature
Pursuant to the requirements of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
| Dated: October 19, 2026 |
Xanadu Quantum Technologies Limited |
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By: |
/s/ Michael Trzupek |
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Michael Trzupek |
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Chief Financial Officer |
Exhibit Index
| Exhibit |
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Description of Exhibit |
| 99.1 |
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Press release dated October 19, 2026 – Xanadu Secures Up to USD $10 Million in Additional DARPA Support to Accelerate Quantum R&D Roadmap |
Exhibit 99.1
Xanadu Secures Up to USD $10 Million in Additional DARPA Support
to Accelerate Quantum R&D Roadmap
Continued DARPA investment reinforces Xanadu’s progress toward
fault-tolerant, utility-scale photonic quantum computing
TORONTO, ON | October 19, 2026 /GLOBE NEWSWIRE/ — Xanadu
Quantum Technologies Limited (“Xanadu”; NASDAQ/TSX: XNDU), a leading photonic quantum
computing company, today announced that it has received provisional approval for project funding worth up to USD $10 million under DARPA’s
Quantum Benchmarking Initiative (QBI). This one-year contract extension reflects DARPA’s ongoing support and investment in Xanadu’s
R&D, and builds on the company’s work in Stage B.
DARPA’s QBI program evaluates leading quantum computing architectures
to determine which approaches can deliver utility-scale performance within realistic budgets and real-world timelines. Under this contract,
Xanadu expects to execute a dual-purpose strategy over the next 12 months; providing regular progress reports to DARPA for continued evaluation,
while directly allocating the majority of the funding to accelerate the advancement of critical components in its R&D roadmap.
Xanadu believes that its photonic quantum computing architecture offers
distinct advantages over traditional quantum systems. Most notably, it has minimal cooling requirements due to room-temperature compute
operations, a modular, networkable design, and fast clock speeds. The company’s latest photonic quantum computer, Aurora, not only
validates the scalability and viability of Xanadu’s photonic approach by demonstrating networkability, but the Company believes
it also establishes a foundation for all future fault-tolerant quantum systems—systems built to tackle the world’s most intractable
problems.
“Ongoing participation in QBI reinforces Xanadu’s goal
of developing quantum computing solutions that deliver practical value across industries, including drug discovery, advanced chemistry,
aerospace, defense, and AI,” said Dr. Christian Weedbrook, Founder and Chief Executive Officer of Xanadu.
Successful completion of Stage B evaluations maintains Xanadu’s
path through the DARPA QBI program, where quantum computer concepts will undergo formal verification and validation to ensure they can
be constructed as designed and operated as intended.
About Xanadu
Founded in 2016, Xanadu is a Canadian photonic
quantum computing company with the mission to build quantum computers that are useful and available to people everywhere. Xanadu is building
fault-tolerant quantum computers using light, with systems designed to compute at room temperature. Xanadu develops both hardware and
software, including PennyLane, its open-source quantum computing platform. Xanadu is the first pure-play photonic quantum computing company
to list on public markets (Nasdaq/TSX: XNDU) and is recognized globally for its breakthroughs in scalable quantum technologies. Visit
xanadu.ai or follow on X @XanaduAI.
Forward-Looking Statements
This communication includes “forward-looking statements”
within the meaning of the U.S. federal securities laws and “forward-looking information” within the meaning of applicable
Canadian securities laws (collectively, “forward-looking statements”). Forward-looking statements may be identified by the
use of words such as “estimate,” “plan,” “project,” “forecast,” “intend,”
“will,” “expect,” “anticipate,” “believe,” “seek,” “target,” “continue,”
“could,” “may,” “might,” “possible,” “potential,” “predict” or
similar expressions that predict or indicate future events or trends or that are not statements of historical matters. Xanadu has based
these forward-looking statements on current expectations and projections about future events. These statements include: statements regarding
Xanadu’s expectations with respect to the one-year contract extension of up to USD $10 million under the DARPA QBI program; and
Xanadu’s expectation to establish a foundation for all future fault-tolerant quantum systems built to tackle the world’s most
intractable problems.
These forward-looking statements are provided for illustrative
purposes only and are not intended to serve as, and must not be relied on as, a guarantee, an assurance, a prediction or a
definitive statement of fact or probability. Actual events and circumstances are difficult or impossible to predict and will differ
from assumptions, many of which are beyond the control of Xanadu. These forward-looking statements are subject to known and unknown
risks, uncertainties and assumptions that may cause the actual results of Xanadu, levels of activity, performance or achievements to
be materially different from any future results, levels of activity, performance or achievements expressed or implied by such
statements. Such risks and uncertainties include: that risk that Xanadu may never receive the entire additional US $10 million under
its one-year contract extension with DARPA on the timelines currently expected or at all; that Xanadu is pursuing an emerging
technology, faces significant technical challenges and may not achieve commercialization or market acceptance; Xanadu’s
historical net losses and limited operating history; Xanadu’s expectations regarding future financial performance, capital
requirements and unit economics; Xanadu’s use and reporting of business and operational metrics; Xanadu’s competitive
landscape; Xanadu’s dependence on members of its senior management and its ability to attract and retain qualified personnel;
the potential need for additional future financing; Xanadu’s ability to manage growth and expand its operations; potential
future acquisitions or investments in companies, products, services or technologies; Xanadu’s reliance on strategic partners
and other third parties; Xanadu’s concentration of revenue in contracts with government or state-funded entities;
Xanadu’s ability to maintain, protect and defend its intellectual property rights; risks associated with privacy, data
protection or cybersecurity incidents and related regulations; the use, rate of adoption, and regulation of artificial intelligence
and machine learning; uncertainty or changes with respect to laws and regulations; uncertainty or changes with respect to taxes,
trade conditions and the macroeconomic environment; material weaknesses in Xanadu’s internal control over financial reporting
and its ability to maintain internal control over financial reporting and operate as a public company; the outcome of any legal
proceedings or government investigations that may be commenced against Xanadu; Xanadu’s ability to issue equity or
equity-linked securities in the future; and other factors described in Xanadu’s filings with the SEC (www.sec.gov) and the
Canadian Securities Administrators (www.sedarplus.com). These forward-looking statements are based on certain assumptions, including
that none of the risks identified above materialize; that there are no unforeseen changes to economic and market conditions, and
that no significant events occur outside the ordinary course of business. Additional information concerning these and other factors
that may impact such forward-looking statements can be found in filings and potential filings by Xanadu with the SEC and the
Canadian Securities Administrators, including under the heading “Risk Factors.” If any of these risks materialize or
assumptions prove incorrect, actual results could differ materially from the results implied by these forward-looking statements. In
addition, these statements reflect the expectations, plans and forecasts of Xanadu’s management as of the date of this
communication; subsequent events and developments may cause their assessments to change. While Xanadu may elect to update these
forward-looking statements at some point in the future, they specifically disclaim any obligation to do so, unless required by
applicable securities laws. Accordingly, undue reliance should not be placed upon these statements.
In addition, statements that “we believe” and similar statements
reflect Xanadu’s beliefs and opinions on the relevant subject. These statements are based upon information available to Xanadu as
of the date of this communication, and while Xanadu believes such information forms a reasonable basis for such statements, such information
may be limited or incomplete, and Xanadu’s statements should not be read to indicate that Xanadu has conducted an exhaustive inquiry
into, or review of, all potentially available relevant information. These statements are inherently uncertain and investors are cautioned
not to unduly rely upon these statements.
Contacts
Press Contact:
press@xanadu.ai
Investor Relations:
investors@xanadu.ai
