In plain English
FAR 52.204-17, Ownership or Control of Offeror, is a solicitation provision prescribed at FAR 4.180, most recently dated Aug 2020. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
This is a solicitation provision — it applies to offerors when submitting an offer, not to contract performance, so subcontract flowdown is generally not the operative question for it.
Where it's prescribed
As prescribed in 4.1804(b), use the following provision:
Prescribing reference: FAR 4.180.
The official text, verbatim
As prescribed in 4.1804(b), use the following provision:
Ownership or Control of Offeror (Aug 2020)
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(a) Definitions. As used in this provision–
Commercial and Government Entity (CAGE) code means–
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(1) An identifier assigned to entities located in the United States or its outlying areas by the Defense Logistics Agency (DLA) Commercial and Government Entity (CAGE) Branch to identify a commercial or government entity by unique location; or
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(2) An identifier assigned by a member of the North Atlantic Treaty Organization (NATO) or by the NATO Support and Procurement Agency (NSPA) to entities located outside the United States and its outlying areas that the DLA Commercial and Government Entity (CAGE) Branch records and maintains in the CAGE master file. This type of code is known as a NATO CAGE (NCAGE) code.
Highest-level owner means the entity that owns or controls an immediate owner of the offeror, or that owns or controls one or more entities that control an immediate owner of the offeror. No entity owns or exercises control of the highest level owner.
Immediate owner means an entity, other than the offeror, that has direct control of the offeror. Indicators of control include, but are not limited to, one or more of the following: ownership or interlocking management, identity of interests among family members, shared facilities and equipment, and the common use of employees.
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(b) The Offeror represents that it □ has or □ does not have an immediate owner. If the Offeror has more than one immediate owner (such as a joint venture), then the Offeror shall respond to paragraph (c) and if applicable, paragraph (d) of this provision for each participant in the joint venture.
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(c) If the Offeror indicates "has" in paragraph (b) of this provision, enter the following information:
Immediate owner CAGE code: ____________
Immediate owner legal name: ____________
(Do not use a "doing business as" name)
Is the immediate owner owned or controlled by another entity?: □ Yes or □ No.
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(d) If the Offeror indicates "yes" in paragraph (c) of this provision, indicating that the immediate owner is owned or controlled by another entity, then enter the following information:
Highest-level owner CAGE code: ____________
Highest-level owner legal name: ____________
(Do not use a "doing business as" name)
(End of provision)