Power of Attorney for Darren Snellgrove

This filing is an exhibit (Exhibit 24) detailing a Limited Power of Attorney granted by Darren Snellgrove, SVP and Chief Financial Officer of HALOZYME THERAPEUTICS, INC., to James R. Oehler, Boyang Wang, and Jennifer Benoit. The attorneys-in-fact are authorized to execute and file SEC forms (ID, 3, 4, and 5) related to securities transactions and reporting requirements under Section 16 of the Exchange Act on behalf of Mr. Snellgrove. This includes managing EDGAR system access and filings. The power of attorney remains in effect until Mr. Snellgrove is no longer subject to these filing requirements, unless earlier revoked. It clarifies that this delegation does not relieve Mr. Snellgrove of his personal responsibility for compliance with Section 16 obligations.