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Thursday, September 11, 2025

Equity Corporate Actions Alert #2025 - 499
Information Regarding the Tender Offer of Y-mAbs Therapeutics, Inc. (YMAB)

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  • Industry Announcement

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The tender offer by Yosemite Merger Sub, Inc. a wholly owned subsidiary of Perseus Bidco US, Inc. to acquire all of the outstanding common stock of Y-mAbs Therapeutics, Inc. (YMAB) is scheduled to expire one minute after 11:59 p.m. ET, on September 15, 2025, unless extended or terminated. The subsequent merger is tentatively scheduled to close prior to the market open on September 16, 2025. In anticipation of the closing, the stock will be halted immediately following the after-hours session at or around 7:50 p.m. on September 15, 2025. If the merger closes as planned, the stock will remain halted on the day of closing (September 16th) and will be suspended effective September 17, 2025. The details are as follows:

Company/Issue: Y-mAbs Therapeutics, Inc. Common Stock
CUSIP#: 984241109
Symbol: YMAB
Anticipated Last Trading Date: September 15, 2025
Anticipated Marketplace Effective Date for Suspension: September 17, 2025
Merger Consideration: $8.60 for each share held.

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