Under the Private Securities Litigation Reform Act of 1995, the lead plaintiff in a securities class action lawsuit is entitled to reimbursement of reasonable expenses incurred during the litigation process. These expenses typically include legal fees, court costs, expert witness fees, and other necessary expenditures directly related to the case. The purpose of allowing these expenses is to ensure that the lead plaintiff, who represents the interests of all class members, is able to effectively pursue the lawsuit without incurring significant financial burdens. However, it is important to note that the court has the discretion to determine what expenses are considered reasonable and may deny reimbursement for expenses that are deemed excessive or unnecessary. Overall, the provision for reasonable expenses aims to promote fairness and accessibility in securities class action litigation.