In plain English
FAR 52.228-17, Individual Surety—Pledge of Assets (Bid Guarantee), is a solicitation provision prescribed at FAR 28.203-4, most recently dated Feb 2021. 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 28.203-4 (a), insert the following provision:
Prescribing reference: FAR 28.203-4.
The official text, verbatim
As prescribed in 28.203-4 (a), insert the following provision:
Individual Surety—Pledge of Assets (Feb 2021)
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(a)Offerors shall obtain from each person acting as an individual surety on a bid guarantee—
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(1)A pledge of assets that meets the eligibility, valuation, and security requirements described in the Federal Acquisition Regulation (FAR) 28.203-1; and
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(2)Standard Form 28, Affidavit of Individual Surety.
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(b)The Offeror shall include with its offer the information required at paragraph (a) of this provision within the timeframe specified in the provision at FAR 52.228-1, Bid Guarantee, or as otherwise established by the Contracting Officer.
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(c)The Contracting Officer may release the security interest on the individual surety's assets in support of a bid guarantee based upon evidence that the offer supported by the individual surety will not result in contract award.
(End of provision)