Quanterix : Amends Agreement with Akoya

QTRX

Synergistic Combination Delivering Compelling Strategic and Financial Benefits and Long-Term Value for Stockholders

April 2025

Legal Information

In connection with the proposed acquisition of Akoya Biosciences, Inc. ("Akoya" or "AKYA") by Quanterix Corporation ("Quanterix" or "QTRX"), Quanterix will file with the Securities and Exchange Commission ("SEC") a post-effective amendment to its registration statement on Form S-4 (as so amended, the "Registration Statement"), which will contain a preliminary proxy statement of Akoya and a preliminary prospectus of Quanterix (the "Proxy Statement/Prospectus"), and each of Quanterix and Akoya have, and may in the future, file with the SEC other relevant documents regarding the proposed transaction. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT AND THE PROXY STATEMENT/PROSPECTUS CAREFULLY AND IN THEIR ENTIRETY AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC BY QUANTERIX AND AKOYA, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THOSE DOCUMENTS WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT

QUANTERIX, AKOYA AND THE PROPOSED TRANSACTION. A definitive copy of the Proxy Statement/Prospectus will be mailed to Akoya stockholders when that document is final. Investors and security holders will be able to obtain the Registration Statement and the Proxy Statement/Prospectus, as well as other filings containing information about Quanterix and Akoya, free of charge from Quanterix or Akoya or from the SEC's website when they are filed. The documents filed by Quanterix with the SEC may be obtained free of charge at Quanterix's website, at https://www.quanterix.com, or by requesting them by mail at Quanterix Investor Relations, 900 Middlesex Turnpike, Billerica, MA 01821. The documents filed by Akoya with the SEC may be obtained free of charge at Akoya's website, at https://www.akoyabio.com, or by requesting them by mail at Akoya Biosciences, Inc., 100 Campus Drive, 6th Floor, Marlborough, MA 01752 ATTN: Chief Legal Officer.

Quanterix and Akoya and certain of their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Akoya in

respect of the proposed transaction. Information about Akoya's directors and executive officers is available in the Proxy Statement/Prospectus and Akoya's proxy statement dated April 23, 2024, for its 2024 Annual Meeting of Stockholders, and other documents filed by Akoya with the SEC. Other information regarding the persons who may, under the rules of the SEC, be deemed participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, is contained in the Proxy Statement/Prospectus and other relevant materials to be filed with the SEC regarding the proposed transaction when they become available. Investors should read the definitive Proxy Statement/Prospectus carefully when it becomes available before making any voting or investment decisions. You may obtain free copies of these documents from Quanterix or Akoya as indicated above.

This communication shall not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval with respect to the transaction

contemplated by the Merger Agreement (the "Merger"), nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the U.S. Securities Act of 1933, as amended.

Legal Information (Continued)

Statements included in this presentation which are not historical in nature or do not relate to current facts are intended to be, and are hereby identified as, forward-looking statements for purposes of the safe harbor provided by Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements are based on, among other things, projections as to the anticipated benefits of the proposed transaction as well as statements regarding the impact of the proposed transaction on Quanterix's business and future financial and operating results, the amount and timing of synergies from the proposed transaction and the closing date for the proposed transaction. Words and phrases such as "may," "approximately," "continue," "should," "expects," "projects," "anticipates," "is likely," "look ahead," "look forward," "believes," "will," "intends," "estimates," "strategy," "plan," "could," "potential," "possible" and variations of such words and similar expressions are intended to identify such forward-looking statements. Quanterix and Akoya caution readers that forward-looking statements are subject to certain risks and uncertainties that are difficult to predict with regard to, among other things, timing, extent, likelihood and degree of occurrence, which could cause actual results to differ materially from anticipated results. Such risks and uncertainties include, among others, the following possibilities: the occurrence of any event, change or other circumstances that could give rise to the right of one or both of the parties to terminate the definitive merger agreement entered into between Quanterix and Akoya; the outcome of any legal proceedings that may be instituted against Quanterix or Akoya; the failure to obtain necessary regulatory approvals (and the risk that such approvals may result in the imposition of conditions that could adversely affect the combined company or the expected benefits of the proposed transaction) and the approval of Akoya's stockholders or to satisfy any of the other conditions to the proposed transaction on a timely basis or at all; the possibility that the anticipated benefits and synergies of the proposed transaction are not realized when expected or at all, including as a result of the impact of, or problems arising from, the integration of the two companies or as a result of the strength of the economy and competitive factors in the areas where Quanterix and Akoya do business; the possibility that the proposed transaction may be more expensive to

complete than anticipated; diversion of management's attention from ongoing business operations and opportunities; potential adverse reactions or changes to business or employee relationships, including those resulting from the announcement or completion of the proposed transaction; changes in Quanterix's share price before the closing of the proposed transaction; risks relating to the potential dilutive effect of shares of Quanterix common stock to be issued in the proposed transaction; and other factors that may affect future results of Quanterix, Akoya and the combined company. Additional factors that could cause results to differ materially from those described above can be found in Quanterix's Annual Report on Form 10-K for the year ended December 31, 2024, Akoya's Annual Report on Form 10-K for the year ended December 31, 2024, and in other documents Quanterix and Akoya file with the SEC, which are available on the SEC's website at https://www.sec.gov.

To supplement Quanterix's preliminary financial information presented on a GAAP basis, Quanterix has provided certain non-GAAP financial measures, including adjusted gross margin and adjusted gross profit (non-GAAP). Management uses these non-GAAP measures to evaluate our operating performance in manner that allows for meaningful period-to-period comparison and analysis of trends in our business and our competitors. Management believes that presentation of these non-GAAP measures provides useful information to investors in assessing our operating performance within our industry and in order to allow comparability to the presentation of other companies in our industry. The non-GAAP financial information presented herein for Quanterix and Akoya should be considered in conjunction with, and not as a substitute for, the financial information presented in accordance with GAAP. Investors are encouraged to review the reconciliation of these non-GAAP measures to their most directly comparable GAAP financial measure set for the herein. Quanterix is not able to reconcile its forward-looking adjusted gross margin (non-GAAP) measure for itself or Akoya because the Company cannot predict the timing and amounts of certain discrete items, which could significantly impact GAAP results.

Table of Contents

The Combination Offers Stockholders the Greatest Opportunity

for Value Creation 15

The Amended Transaction Is the Result of a Rigorous Process Led by an Unconflicted Transaction Committee and an Independent Board of Directors

Conclusion 46

Appendix 49

Disclaimer

Quanterix Corporation published this content on April 29, 2025, and is solely responsible for the information contained herein. Distributed via Public Technologies (PUBT), unedited and unaltered, on April 29, 2025 at 12:56 UTC.