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An SEC filing revealed that Merck's controversial 6% premium for Terns was due to updated, non-public clinical data showing weaker efficacy than previously announced. This new data caused a rival bidder offering $61 plus a CVR to drop out entirely, demonstrating how crucial due diligence data rooms are in M&A.

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Terns Pharma successfully shifted its focus after its GLP-1 obesity drug showed underwhelming results. By pivoting to its promising oncology asset for chronic myeloid leukemia, the company dramatically increased its value, culminating in a nearly $7 billion acquisition by Merck. This demonstrates the value of decisively abandoning struggling programs for high-potential ones.

Eli Lilly's deal chief revealed that even premium acquisition offers are frequently rebuffed by public biotech companies without negotiation. This highlights a significant valuation gap where biotech boards believe their assets are worth far more than what even well-capitalized buyers like Lilly are willing to pay, stalling potential M&A activity.

Contrary to seeking fully de-risked assets, pharmaceutical companies often prefer acquiring companies with some remaining clinical risk. This strategy allows them to leverage unique insights on early data to acquire assets at a better valuation, creating an opportunity for outsized returns before the value is obvious to others.

Major firms like Merck employ varied deal structures to build pipelines. Merck's $6.7 billion all-upfront acquisition of Terns for a Phase 1-2 asset contrasts with its Quotient collaboration, which has a small $20 million upfront but $2.2 billion in discovery-stage milestones. This highlights a flexible approach to risk and reward.

Merck cited Cedara's extensive, pre-Phase 3 research on pricing and cost-effectiveness as a key factor in its $10B acquisition. This demonstrates that early-stage biotechs can significantly increase their M&A value by proactively building a robust commercial case alongside their clinical development.

An acquisition target with a valuation that seems 'too good to be true' is a major red flag. The low price often conceals deep-seated issues, such as warring co-founders or founders secretly planning to compete post-acquisition. Diligence on people and their motivations is more critical than just analyzing the financials in these cases.

Despite a pivotal data readout pending, an acquisition of Abivax could happen beforehand. Historical deals like Merck's acquisition of Prometheus and Pfizer's of Arena show that large pharma companies are willing to 'roll the dice' and pay a premium for pre-data assets when their conviction in the science is high.

Biotech firms are beginning to selectively disclose clinical data, citing the need to protect R&D from fast-following competitors, particularly from China. This forces investors into a difficult position: either trust management without full transparency or discount the company's value due to the opacity.

Turn Therapeutics' board accepted a sale to Merck at a minimal 6% premium, frustrating investors who believed in the long-term value of its CML drug. This move is seen as stripping optionality from shareholders, forcing a sale at a price that may not reflect the asset's full potential.

Following a cautious 2025, dealmakers now demand tangible evidence of an asset's value. This "proof over promise" approach involves conducting integration planning during due diligence and heavily favoring targets with clearer regulatory pathways to minimize post-acquisition surprises.