Not that it matters much now, but the answer is right on the Form 4 if you look for the Explanation.
"1. The shares were sold solely to satisfy tax or other government withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs") of the Issuer."
Anytime you see a bunch of executives filing Forms 4 at the same time for small amounts, just assume that's what it's for (or read the explanation). Anyway, it's insignificant and irrelevant.
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