In plain English
FAR 52.219-6, Notice of Total Small Business Set-Aside, is a contract clause prescribed at FAR 19.507(c), most recently dated Nov 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
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 19.507(c), insert the following clause:
Prescribing reference: FAR 19.507(c).
The official text, verbatim
As prescribed in 19.507(c), insert the following clause:
Notice of Total Small Business Set-Aside (Nov 2020)
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(a) Definition.
Small business concern, as used in this clause—
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(1) Means a concern, including its affiliates, that is independently owned and operated, not dominant in the field of operation in which it is bidding on Government contracts, and qualified as a small business under the size standards in this solicitation.
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(2) Affiliates, as used in paragraph (a)(1) of this clause, means business concerns, one of whom directly or indirectly controls or has the power to control the others, or a third party or parties control or have the power to control the others. In determining whether affiliation exists, consideration is given to all appropriate factors including common ownership, common management, and contractual relationships. SBA determines affiliation based on the factors set forth at 13 CFR 121.103.
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(b) Applicability. This clause applies only to-
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(c) General.
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(1) Offers are solicited only from small business concerns. Offers received from concerns that are not small business concerns shall be considered nonresponsive and will be rejected.
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(2) Any award resulting from this solicitation will be made to a small business concern.
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(End of clause)
Alternate I (Mar 2020) . As prescribed in 19.507 (c), substitute the following paragraph (c) for paragraph (c) of the basic clause:
(c) General.(1) Offers are solicited only from small business concerns and Federal Prison Industries, Inc. (FPI). Offers received from concerns that are not small business concerns or FPI shall be considered nonresponsive and will be rejected.
(2) Any award resulting from this solicitation will be made to either a small business concern or FPI.