UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 20, 2015 (March 17, 2015)

Hercules Technology Growth Capital, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (650) 289-3060

Not Applicable

(Former name or address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Hercules Technology Growth Capital, Inc. (the “Company”) today announced Chief Financial Officer (“CFO”) Jessica Baron’s decision to resign from her position within the next few months or until the company identifies her permanent successor. Ms. Baron will continue to direct Hercules’s finance activities as CFO until her departure date. The Company is in the process of conducting a national search for a new CFO and expects to announce a succession plan on or before her departure date.

Ms. Baron has served as Hercules’ CFO since June 2011. She joined Hercules in 2006 and served in various roles within the company’s finance group, prior to her promotion to CFO. Any unvested awards granted to Ms. Baron will cease to vest on her departure date.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.