Regulation G

The Federal Reserve Board regulation that governs the extension of credit for securities transactions by commercial lenders and non-financial corporations.

Investopedia Says:
The Federal Reserve adopted Regulation G in 1968 as a companion to Regulation U.

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Federal Reserve Board rule regulating lenders other than commercial banks, brokers or dealers who, in the ordinary course of business, extend credit to individuals to purchase or carry securities. Special provision is made for loans by corporations and credit unions to finance purchases under employee stock option and stock purchase plans.