Solved
TurboTax seems to exclude ALL prof'l service firms. But the sba.gov seems to differentiate instead between public vs personal services, excluding the latter.
If you decide to treat your stock as small business stock but are not sure if that is allowed, you could file Form 8275 Disclosure Statement explaining your position. Making such a disclosure could reduce or eliminate future penalties associated with adopting a position that is later denied by the IRS. You can read more here: Form 8275 instructions
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