definiens: means any ( a ) direct or indirect acquisition of all or substantially all of the assets of Isis,(b ) direct or indirect acquisition by a Person, or group of Persons acting in concert, of [ * * * ] % or more of the voting equityinterests of Isis, ( c ) tender offer or exchange offer that results in any Person, or group of Persons acting in concert, beneficiallyowning [ * * * ] % or more of the voting equity interests of Isis, or ( d ) merger, consolidation, other business combination orsimilar transaction involving Isis, pursuant to which any Person owns all or substantially all of the consolidated assets, netrevenues or net income of Isis, taken as a whole, or which results in the holders of the voting equity interests of Isisimmediately prior to such merger, consolidation, business combination or similar transaction ceasing to hold [ * * * ] % or moreof the combined voting power of the surviving, purchasing or continuing entity immediately after such merger, consolidation, other business combination or similar transaction, in all cases where such transaction is to be entered into withany Person other than [COMPANY] or its Affiliates