Hercules Technology Growth Capital is offering 6,600,000 shares of common stock pursuant to an effective shelf registration statement in an underwritten public offering. Hercules plans to grant the underwriters for the offering an option to purchase up to an additional 990,000 shares of common stock. Wells Fargo Securities, Raymond James and Keefe, Bruyette & Woods are acting as joint bookrunning managers in this offering.

Hercules expects to use the net proceeds from this offering to fund investments in debt and equity securities in accordance with its investment objective and for other general corporate purposes.

The securities described above are being offered by Hercules pursuant to an effective shelf registration statement previously filed with and declared effective by the Securities and Exchange Commission on June 6, 2014. The offering may be made only by means of a prospectus supplement and the accompanying prospectus.

Investors are advised to carefully consider the investment objectives, risks, and charges and expenses of Hercules before investing. The preliminary prospectus supplement and the accompanying prospectus, which have been filed with the SEC, contain this and other information about Hercules and should be read carefully before investing.