Why Am I Not Covered Under Employer Mandate?

I am a temporary full time employee at a large company (over 100 people employed). I would like clarification as to if my employer must offer me insurance if I have worked for them for over 30 days in 2015?

If my employer does provide affordable insurance to 95% of it’s full-time workforce, is it possible I am in the 5% not offered insurance and the mandate does not require that it is offered to me or that the employer is not penalized?