13F-HR 1 a2141704z13f-hr.txt 13F-HR UNITED STATES SECURITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 13F Form 13F COVER PAGE Report for the Calendar Year or Quarter Ended 6/30/04 ------- Check here if Amendment / /; Amendment Number:___ This Amendment (Check only one): / / is a restatement / / adds new holding entries Institutional Investment Manager Filing this Report: Name: PADCO Advisors, Inc. Address: 9601 Blackwell Road Suite 500 Rockville, MD 20850 Form 13F File Number: 28-05945 The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form. Person Signing this Report on Behalf of Reporting Manager: Name Carl G. Verboncoeur Title: CEO Phone: (301) 296-5100 Signature, Place, and Date of Signing: /s/ Carl G. Verboncoeur Rockville, MD August 13, 2004 --------------------------- ------------- --------------- Report Type (Check only one.): /X/ 13F HOLDINGS REPORT (Check here if all holdings of this reporting manager are reported in this report.) / / 13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).) / / 13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).) FORM 13F SUMMARY PAGE REPORT SUMMARY: Number of Other Included Managers: -0- ------- Form 13F Information Table Entry Total: 2328 ---- Form 13F Information Table Value Total: $ 3,134,944 ----------- (thousands) List of Other Included Managers: Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.

FORM 13F INFORMATION TABLE

PADCO ADVISORS INC /MD NEW/ 13F-HR