@dbdd3
I can not give you the answer as it depends on if those stock transactions were applicable to your job such as options or grants? Just because a company is located in MA, will not mean it is MA source. If you work at the company and it was some type of "wages/ income as a result of that employment or business venture" then you may need to allocate the gains too....
What portion was a result of work vs. what portion was personal investment decision holding allocation?
This will be a helpful resource.
https://www.mass.gov/regulations/830-CMR-625a1-non-resident-income-tax#-3-income-subject-to-massachu...
**I don't work for TT. Just trying to help. All the best.
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