Cyclerion Therapeutics and Korsana Biosciences Announce Transformative Merger and \$380M Financing

Key Highlights for Investors

• Merger Agreement: Cyclerion Therapeutics, Inc. (Nasdaq: CYCN) and privately-held Korsana Biosciences, Inc. have entered into a definitive all-stock merger agreement. The combined company will operate as Korsana Biosciences, Inc. and will trade on Nasdaq under the new ticker symbol “KRSA”.
• Substantial Financing Secured: Korsana has secured commitments for an oversubscribed private investment expected to result in approximately \$380 million in gross proceeds. This syndicate is led by Fairmount and Venrock Healthcare Capital Partners, with participation from top-tier investors including General Atlantic, Wellington Management, RA Capital Management, J.P. Morgan Life Sciences Private Capital, Sanofi Ventures, and others.
• Funding Runway: The anticipated cash balance, including this financing, is expected to fund operations into 2029, covering multiple anticipated clinical milestones and data readouts.
• Lead Program – KRSA-028: Korsana’s lead asset is a next-generation shuttled monoclonal antibody targeting amyloid beta for the treatment of Alzheimer’s disease. Key data from Phase 1 healthy volunteer studies are expected in mid-2027, with interim proof-of-concept data on amyloid plaque clearance in Alzheimer’s patients anticipated by year-end 2027.
• Strategic Platform and Pipeline: KRSA-028 leverages the proprietary THETA™ platform, designed to enhance brain delivery and address limitations of prior transferrin receptor (TfR1)-based approaches. Additional THETA-enabled therapies for other neurodegenerative diseases are in preclinical development.
• Shareholder Impact: At closing, pre-merger Cyclerion shareholders are expected to own approximately 1.5% of the combined company, with pre-merger Korsana stockholders (inclusive of participating investors) owning about 98.5%. This is subject to adjustment based on Cyclerion’s net cash at closing.
• Leadership and Governance: Korsana’s current CEO, Dr. Jonathan Violin, will lead the combined company, with the current Korsana board becoming the board of the combined entity, chaired by Fairmount’s Tomas Kiselak. The transaction has been approved by both companies’ boards.
• Expected Timeline: The deal is expected to close in Q3 2026, pending regulatory and shareholder approvals, including SEC review and Hart-Scott-Rodino clearance.

Details and Strategic Implications

The merger between Cyclerion Therapeutics and Korsana Biosciences marks a strategic pivot for Cyclerion, which will effectively become part of a new, well-financed neuroscience-focused company. Investors should note that the new Korsana Biosciences will be well-capitalized, with sufficient cash to fund major pipeline milestones through 2029, including important clinical data releases.

Korsana’s lead drug candidate, KRSA-028, is a next-generation antibody targeting amyloid beta for Alzheimer’s disease, a space with significant unmet need and major recent investor and pharmaceutical company interest. The technology platform (THETA™) is designed to overcome limitations in brain delivery that have hindered other approaches, potentially offering enhanced efficacy and safety. The company is also building a pipeline of additional assets targeting other neurodegenerative diseases, leveraging the same platform.

The \$380 million private financing, led by a blue-chip syndicate of investors, is a strong validation of the quality of Korsana’s pipeline and strategy. This large cash infusion provides runway to achieve key clinical and value-inflection milestones, including Phase 1 and proof-of-concept data for KRSA-028. This level of funding and investor confidence is unusual for a preclinical/early clinical stage biotech and is likely to be viewed positively by the market.

However, Cyclerion shareholders should be aware that the merger terms are highly dilutive: they are expected to own only about 1.5% of the combined company post-transaction, with the remainder owned by Korsana shareholders and the new investor syndicate. The final percentage could adjust based on Cyclerion’s net cash at closing.

The transaction is subject to customary closing conditions, including shareholder votes, SEC registration of the new shares, and antitrust clearance. Investors should monitor these milestones, as delays or failure to close could affect the valuation.

Potential Share Price Impact

• This is a transformative, value-moving event for Cyclerion, effectively turning the company into a new high-profile Alzheimer’s and neurodegeneration player with a strong cash position and pipeline. The large financing, blue-chip investors, and new leadership team are all potentially share price-positive developments.
• However, the extreme dilution to Cyclerion holders may result in near-term volatility and pressure on the stock. Investors will need to assess whether the small pro forma ownership stake in the new entity compensates for the company’s legacy value.
• Key near-term catalysts include closing the financing and the merger, as well as any new data or business updates from Korsana.

Conference Call and Next Steps

A joint conference call to discuss the transaction will be held on April 1, 2026, at 8:00 am ET. Investors can access the event for further details via the provided link.

Important Information for Shareholders

• The transaction requires shareholder approval from both companies. Cyclerion will file a registration statement and proxy statement/prospectus with the SEC. Shareholders are strongly urged to read these documents when available.
• Further information and free copies of these documents will be available on the SEC’s website and via Cyclerion’s investor relations.
• Investors should be aware of the risks enumerated, including potential failure to close, clinical and regulatory risks, integration risks, and the competitive landscape in Alzheimer’s and neurodegenerative diseases.

Contact Information

Korsana Investor and Media Inquiries: [email protected]
Cyclerion Investor and Media Inquiries: [email protected]

Disclaimer: This article contains forward-looking statements based on current management expectations, which are subject to risks and uncertainties that could cause actual results to differ materially. This article does not constitute an offer to sell or a solicitation of an offer to buy any securities. Investors should review all SEC filings and consult their financial advisors before making investment decisions. The author assumes no responsibility for investment actions taken based on this information.

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