Invitación a cuando menos tres personas — Mexico
A restricted federal procurement procedure where the contracting entity invites at least three suppliers; electronic instances may restrict participation to invited parties on COMPRAS MX.
What it does
Invitación a cuando menos tres personas is a restricted contracting procedure in which the convener issues invitations to at least three prospective suppliers. In the cited convocatoria the award is to a single lot and is to be given to an invited bidder that meets the stated requirements and evaluation criteria.
Distinction
The defining feature is limitation of participation to those invited by the convener. Where the convocatoria is conducted as an electronic procedure, the document states that only those invited through COMPRAS MX may participate in that instance.
Practical consequence for a supplier
A supplier must be among the invited parties announced in the convocatoria (and on COMPRAS MX when the procedure is electronic) to participate; for electronic procedures, platform operation guidance and the mechanisms for submitting proposals are provided via the platform.
Sources
- INALI procurement procedure document (convocatoria text stating electronic procedure and that only invited bidders via COMPRAS MX may participate)
- IMSS document: Operation of the Plataforma COMPRAS MX (describing envío y firma electrónica de proposiciones and support contacts)
Reviewed: October 27, 2026
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