A method for insuring a stock option issued by an individual company from among a population of companies, to a beneficiary from among a population of beneficiaries, against loss of working ability of the beneficiary and consequent loss of the stock option, the stock option being vestable on at least one vesting date, the method including computing an economic risk factor characterizing the behavior of stock options in the population of companies and an actuarial risk factor characterizing the likelihood of loss of working ability in the population of beneficiaries and, on at least one vesting date, computing a premium based on the economic and actuarial risk factors and on the value of the shares on the vesting date.