# Mersana Therapeutics, Inc. — merger [completed]
Source: SEC API (secapi.ai) · situation sit_c92a20e463d6ac6ab206 · retrieved 2026-08-11T16:13:05.768Z

## Overview
Mersana Therapeutics, Inc. is a pharmaceutical company developing therapeutic treatments.

Day One Biopharmaceuticals, Inc. completed its acquisition of Mersana Therapeutics, Inc. on January 6, 2026, following expiration of the tender offer on January 5, 2026. The tender offer resulted in 3,029,135 shares (approximately 60.57% of outstanding shares) being validly tendered. Each share was converted into the right to receive $25.00 per share in cash, plus one non-tradeable contingent value right (CVR) per share representing the right to receive contingent milestone payments of up to an aggregate of $30.25 per CVR in cash upon achievement of specified milestones. The merger was consummated under Section 251(h) of the Delaware General Corporation Law without a stockholder vote, with Mersana continuing as a direct wholly-owned subsidiary of Day One.

## Terms
- Counterparty: Day One Biopharmaceuticals, Inc. · Consideration: mixed · Stake: 60.57% · Price/share: $25

## Key dates
- Expiry 2026-01-05

## Timeline
- 2026-01-06 · SC 14D9/A (0001104659-26-001124): SC 14D9/A - Mersana Therapeutics, Inc. — *Mersana Therapeutics, Inc. is a pharmaceutical company developing therapeutic treatments.* Day One Biopharmaceuticals, Inc. completed its acquisition of Mersana Therapeutics, Inc. on January 6, 2026, following expiration of the tender offer on January 5, 2026. The tender offer resulted in 3,029,135 shares (approximately 60.57% of outstanding shares) being validly tendered. Each share was converted into the right to receive $25.00 per share in cash, plus one non-tradeable contingent value right (CVR) per share representing the right to receive contingent milestone payments of up to an aggregate of $30.25 per CVR in cash upon achievement of specified milestones. The merger was consummated under Section 251(h) of the Delaware General Corporation Law without a stockholder vote, with Mersana continuing as a direct wholly-owned subsidiary of Day One.
  https://www.sec.gov/Archives/edgar/data/1442836/0001104659-26-001124.txt

## Citations
- 0001104659-26-001124 — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=&dateb=&owner=include&count=40&search_text=000110465926001124