HEALTH

Horizon Boosts Offer for Hillhaven: Horizon sweetened the hostile bid as Hillhaven Corp.’s largest shareholder said it will begin a proxy battle to urge the Tacoma, Wash.-based firm to agree to a sale. The latest offensive boosts the stakes in a fight that began Jan. 26, when Horizon bid $1 billion for the rival nursing home operator with the support of its largest shareholder, Tenet Healthcare Corp. The Tenet hospital chain, formerly named National Medical Enterprises Inc., owns 27% of Hillhaven’s common shares. Albuquerque, N.M.-based Horizon Healthcare Corp. raised its offer to $31 a share, or about $1.5 billion, from $28 a share.