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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1397821	Duff & Phelps Corp	DUF	Security Brokers, Dealers & Flotation Companies (6211)	208893559

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1294062	Noah Gottdiener	C/O Duff &Amp; Phelps Corporation 55 East 52Nd Street New York NY 10055	Ceo And President	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Class A Common Stock	Acquisiton	2012-09-10	190	$0.00	190	No	4	M	Indirect	see footnote
Class A Common Stock	Disposition	2012-09-10	190	$13.25	0	No	4	S	Indirect	see footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Indirect	see footnote
No	4	S	Indirect	see footnote

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Class A Common Stock	Duff & Phelps Acquisitions, LLC New Class A Units	Disposition	2012-09-10	190	$0.00	190	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
2,046			No	4	M	Indirect

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Class A Common Stock	325,236	Direct

Reported Derivative Holdings

Sec. Name	Sec. Type	Price	Date	Expiration Date	Amount	Remaning Holdings	Nature of Ownership
Class A Common Stock	Duff & Phelps Acquisitions, LLC New Class A Units	$0.00			483,491	483,491	Direct
Class A Common Stock	Duff & Phelps Acquisitions, LLC New Class A Units	$0.00			192,982	192,982	Indirect

Expiration Date	Amount	Remaning Holdings	Nature of Ownership
	483,491	483,491	Direct
	192,982	192,982	Indirect

Footnotes

Pursuant to an exchange agreement entered into in connection with the closing of the initial public offering of Duff & Phelps Corporation (the "IPO"), holders of New Class A Units of Duff & Phelps Acquisitions, LLC ("DPA") issued in connection with the reorganization of DPA immediately prior to the consummation of the IPO may exchange their New Class A Units for Class A common stock of Duff & Phelps Corporation on a one-for-one basis, subject to the vesting, minimum retained ownership requirements and transfer restrictions and customary conversion rate adjustments for splits, unit distributions and reclassifications contained in the exchange agreement.
Such shares are held by Mr. Gottdiener through Vestar/D&P Holdings, LLC.
Shares were sold by Vestar/D&P Holdings, LLC in connection with the exercise of a portion of the over-allotment option in connection with a public offering of shares of Class A common stock.
Such shares are held by trusts for the benefit of Mr. Gottdiener.