Exhibit 99.1

              HERCULES TO BE ADDED TO RUSSELL MICROCAP(TM) INDEX

    PALO ALTO, Calif., Sept. 29 /PRNewswire-FirstCall/ -- Hercules Technology
Growth Capital, Inc. (Nasdaq: HTGC), a leading debt and equity growth capital
provider to technology related companies, today announced that is has been
included in a preliminary list of companies that will be added to the Russell
Microcap Index at the close of the market on Sept. 30, 2005. Russell indexes are
widely used by investment managers and institutional investors for index funds
and as benchmarks for both passive and active investment strategies. More than
$2.5 trillion in assets currently are benchmarked against Russell indexes.
Investment managers who oversee these funds purchase shares of member stocks
according to that company's weighting in the particular index.

    (Logo:  http://www.newscom.com/cgi-bin/prnh/20050609/SFTH149LOGO)

    "We are pleased that Hercules will be added to the Russell Microcap
Index," said Manuel A. Henriquez, chairman, president and CEO of Hercules. "We
expect that our inclusion in the index will increase the company's visibility
with investors and provide us with the opportunity to expand our shareholder
base."

    The Russell Microcap Index offers investors access to the microcap segment
of the US Equity market. The index is constructed to provide a comprehensive and
unbiased barometer for the microcap segment trading on national exchanges, while
excluding lesser-regulated OTC bulletin board securities and pink-sheet stocks
due to their failure to meet national exchange listing requirements. The Russell
Microcap Index is completely reconstituted annually to ensure larger stocks do
not distort the performance and characteristics of the true microcap opportunity
set. Eligible IPOs are added to Russell US indexes at the end of each calendar
quarter.

    About Hercules Technology Growth Capital:

    Founded in December 2003, Hercules Technology Growth Capital, Inc. is a
NASDAQ traded specialized finance company providing debt and equity growth
capital to technology related companies at all stages of development. The
company primarily finances privately held companies backed by leading venture
capital and private equity firms and also may finance certain publicly traded
companies. Hercules focuses its investments in companies active in technology
and technology related industries such as computer software and hardware,
networking systems, semiconductors, semiconductor capital equipment, information
technology infrastructure, Internet consumer and business services,
telecommunications, and life sciences. The company's investments are originated
through its principal office located in the Silicon Valley, as well as
additional offices in the Boston, Boulder and Chicago areas. Providing capital
to privately held companies backed by leading venture capital and private equity
firms involves a certain degree of credit risk and may result in potential
losses.

    For more information, please visit http://www.herculestech.com . Companies
interested in learning more about financing opportunities should contact
info@herculestech.com or call 650-289-3060.

CONTACT:  Hercules Technology Growth Capital, Inc., +1-650-289-3060, or
info@herculestech.com; or Deborah Stapleton, +1-650-470-0200/
Photo: NewsCom:  http://www.newscom.com/cgi-bin/prnh/20050609/SFTH149LOGO