Exhibit 31.2
Certification
I, Stephen A. Lasota, certify that:
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| 1. | I have reviewed this Quarterly Report on Form 10-Q/A of Cowen Group, Inc: |
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| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; |
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| 3. | [Intentionally omitted] |
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| 4. | [Intentionally omitted] |
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| 5. | [Intentionally omitted] |
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| Date: | August 8, 2013 | | /s/ STEPHEN A. LASOTA | |
| | | | Name: Stephen A. Lasota
Title: Chief Financial Officer (principal financial officer and principal accounting officer)
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