>My understanding is that there is no legal requirement to so note [a 10b5-1 sale]<
In practice, all insider sales pursuant to a 10b5-1 plan are so noted on Form 4. There are no exceptions unless the omission was a clerical error, in which case a Form 4/A amendment is filed to supersede the Form 4.
Moreover, 10b5-1 sales must be periodic; a one-off transaction to exploit a “trading window” does not qualify for the legal protection afforded by rule 10b5-1.
I think this matter can be put to rest. Regards, Dew
“The efficient-market hypothesis may be
the foremost piece of B.S. ever promulgated
in any area of human knowledge!”