您好，根据移民局STEM延期新政，第三方公司例如一些staffing company和consulting company是不具有申请OPT STEM延期的资格的，详细规定如下：
There are several aspects of the STEM OPT extension that do not make it apt for
certain types of arrangements, including multiple employer arrangements, sole proprietorships,
employment through “temp” agencies, employment through consulting firm arrangements that
provide labor for hire, and other relationships that do not constitute a bona fide employer-employee
relationship. One concern arises from the difficulty individuals employed through
such arrangements would face in complying with, among other things, the training plan
requirements of this rule. Another concern is the potential for visa fraud arising from such
arrangements. Furthermore, evaluating the merits of such arrangements would be difficult and
create additional burdens for DSOs. Accordingly, DHS clarifies that students cannot qualify for
STEM OPT extensions unless they will be bona fide employees of the employer signing the
Training Plan, and the employer that signs the Training Plan must be the same entity that
employs the student and provides the practical training experience. DHS recognizes that this
outcome is a departure from SEVP’s April 23, 2010 Policy Guidance (1004-03).
