Halper Sadeh LLC said it is investigating Lantheus Holdings, Inc., Bowhead Specialty Holdings Inc. and Safety Insurance Group Inc. over potential violations of federal securities laws and-or breaches of fiduciary duties tied to their proposed sales. The law firm said the reviews focus on whether shareholders are being offered adequate consideration and whether deal terms could restrict superior competing bids. Lantheus is set to be sold to Curium US Holdings LLC for $102.50 a share in cash plus non-transferable Contingent Value Rights (rights to possible future cash payments) worth up to $12.00 a share if specified commercial milestones for Lantheus products are met through 2030. Bowhead agreed to a sale to American Family Mutual Insurance Company, S.I. for $34.00 a share in cash, while Safety Insurance agreed to a sale to an affiliate of Mapfre S.A. for $105.00 a share in cash. Halper Sadeh said it may seek increased consideration, additional disclosures, or other relief on behalf of shareholders.