Yes. Property acquired during the marriage is presumed to have been jointly acquired, no matter how it is titled (whose name is on it). The definition of marital property is so broad that unvested stock options acquired by one spouse during the marriage have been determined to to be divisible as marital property.
The standard for defining marital property which may be divided is:
It is a valuable right which has been purchased through joint efforts of the spouses to the extent that it has been acquired or enhanced during the marriage, and as such becomes jointly acquired property during the marriage.
Business and asset valuation is an important part of divorce cases to ensure that each spouse obtains their fair share of marital property value. Even when property is separate -- property that was owned by one spouse prior to the marriage -- in certain circumstances the non-titled spouse may have a claim to a part of the increase in value in the owning spouse's separate property during the marriage. This is a common issue with deferred compensation plans, such as pensions and 401ks, when one spouse had an interest in the deferred compensation plan prior to the marriage and the plan increased in value during the marriage.