Significant subsidiary. The term significant subsidiary means a subsidiary meeting any one of the following conditions:
(1) The value of the investments in and advances to the subsidiary by its parent and the parent's other subsidiaries, if any exceed 10 percent of the value of the assets of the parent or, if a consolidated balance sheet is filed, the value of the assets of the parent and its consolidated subsidiaries.
(2) The total investment income of the subsidiary or, in the case of a noninvestment company subsidiary, the net income exceeds 10 percent of the total investment income of the parent or, if consolidated statements are filed, 10 percent of the total investment income of the parent and its consolidated subsidiaries.
(3) The subsidiary is the parent of one or more subsidiaries and, together with such subsidiaries would, if considered in the aggregate, constitute a significant subsidiary.
17 CFR § 270.8b-2
Unless the context otherwise requires, the terms in paragraphs through (m) of this section, when used in the rules contained in 270.8b-1 through 270.8b-32, in the rules under section 30(a) or (b) of the Act or in the forms for registration statements and reports pursuant to section 8 or 30(a) or (b) of the Act, shall have the respective meanings indicated in this section. The terms EDGAR, EDGAR Filer Manual, electronic filer, electronic filing, electronic format, electronic submission, paper format, and signature shall have the meanings assigned to such terms in part 232 of this chapter (Regulation S-T - General Rules for Electronic Filings).