Exhibit 99.1

Hercules Technology Growth Capital Announces Fiscal Year 2011 Financial Results and Declares and Increases Quarterly Cash Dividend to $0.23, a 5.0% Increase

PALO ALTO, Calif., February 29, 2012 - Hercules Technology Growth Capital, Inc. (NASDAQ: HTGC), a leader in customized debt financing for entrepreneurial venture capital and private equity-backed companies in technology-related markets including cleantech and life science, announced today its financial results for the fourth quarter and year ended December 31, 2011.

Fourth Quarter 2011 Highlights:

2011 Highlights:

“We converted significant liquidity into earning assets in 2011, delivering record gross commitments and fundings and growing our total investment assets by approximately 38% year over year to $653 million, our highest level since inception, said Manuel A. Henriquez, president and CEO of Hercules. “At the same time, Hercules maintained its disciplined investment approach resulting in one of the strongest credit quality quarters in Hercules’ history.”

Henriquez continued, “As we look forward to 2012, we expect to continue to benefit from the high demand for venture capital investment in the marketplace and expect continued monetization of our warrant portfolio which currently contains over 105 venture backed companies, seven of which have on file with the SEC Form S-1 registration statements to complete their initial public offerings, one of which is Facebook. We are in a strong liquidity position given our recent equity raise of approximately $48 million in January 2012 to grow our portfolio. As a result, we believe we are well positioned to deliver increased earnings and dividends to our shareholders in 2012.”

Facebook Equity Investment

In the fourth quarter, Hercules entered into an agreement to acquire approximately $9.6 million through a secondary marketplace in Facebook, Inc., the social networking company, on December 13, 2011 and December 20, 2011 for an aggregate of 307,500 shares at an average price of $31.08 per share. The investments were subject to certain closing conditions and a right of first refusal by Facebook, Inc. which expires thirty days after the date of investment. In February 2012, Hercules was notified that Facebook Inc. had not exercised its repurchase right with respect to any of the shares and had executed all documents necessary to fully transfer the ownership of the shares to Hercules.

Fourth Quarter Review and Operating Results

Investment Portfolio

As of December 31, 2011, over 99.2% of the Company’s debt investments were in a senior secured first lien position, and more than 90.7% of the debt investment portfolio was priced at floating interest rates or floating interest rates with a Prime or LIBOR based interest rate floor. We believe we are well positioned to benefit should market rates increase.

Hercules entered into commitments to provide debt and equity financings of approximately $165.3 million and $61,000, respectively, to new and existing portfolio companies, including restructured loans, in the fourth quarter.

Debt and equity fundings were approximately $96.0 million and $1.2 million, respectively, to new and existing portfolio companies during the fourth quarter. Hercules received approximately $24.5 million of principal repayments, including $13.3 million of early principal repayments and $11.2 million in scheduled principal payments in the fourth quarter.

Unfunded Commitments

As of December 31, 2011, Hercules had unfunded debt commitments of approximately $168.2 million. Since these commitments may expire without being drawn upon, unfunded commitments do not necessarily represent future cash requirements or future earning assets for Hercules. Approximately $92.0 million of these unfunded commitments are dependent upon the portfolio company reaching certain milestones before the Hercules debt commitment becomes available.

Signed Term Sheets

Hercules finished 2011 with approximately $82.5 million in signed non-binding term sheets with seven companies, which generally convert to contractual commitments within approximately 45 to 60 days of signing. Non-binding outstanding term sheets are subject to completion of Hercules' due diligence and final approval process as well as negotiation of definitive documentation with the prospective portfolio companies. It is important to note that not all non-binding term sheets are expected to close and do not necessarily represent future cash requirements. Closed commitments generally fund 70-80% of the committed amount in aggregate over the life of the commitment.

Portfolio Effective Yield

The effective yield on the Company's debt portfolio investments during the quarter was 15.6%, which is down from the fourth quarter of 2010 effective yield of 17.7%, impacted by one portfolio company early payoff. Excluding the effect of fee accelerations that occurred from early payoffs and one-time events, the effective yield for the fourth quarter ended 2011 was 14.0%, compared to the adjusted effective yield in the third quarter of 2011 and fourth quarter of 2010 of approximately 14.2% and 15.8%, respectively. The effective yield is derived by dividing total investment income by the weighted average earning assets during the quarter, which excludes non-interest earning assets such as warrants and equity investments.

Existing Warrants Portfolio and Potential Future Gains

Hercules held warrant positions in approximately 109 portfolio companies, with a fair value of approximately $30.0 million at December 31, 2011, up 26.6% as compared to approximately $23.7 million at December 31, 2010. If exercised, these warrant holdings would require Hercules to invest an approximate additional $73.7 million. Warrants may appreciate or depreciate in value depending largely upon the underlying portfolio company’s performance and overall market conditions. Of the warrants which have monetized since inception, Hercules has realized warrant gain multiples in the range of approximately 1.04x to 8.74x based on the historical rate of return on our investments. However, our current warrant positions may not appreciate in value and, in fact, may decline in value, potentially rendering some of these warrants worthless.

As of December 31, 2011, Hercules had warrants in nine companies which had filed Form S-1 registration statements to complete their initial public offerings, namely:

As of February 29, 2012, Hercules held warrants or equity positions in seven companies which had filed Form S-1 registration statements, including Facebook, Inc.

Subsequent to December 31, 2011, Reply!, Inc. and Intelepeer, Inc. withdrew their initial public offerings while Cempra, Inc. completed its IPO. There can be no assurances that these companies will complete their IPOs in a timely manner or at all.

Income Statement

Total investment income in the fourth quarter of 2011 was approximately $21.2 million compared to approximately $ 17.5 million in the fourth quarter of 2010, due to higher average balance of interest earning investments. The loan portfolio increased by approximately $180.8 million year-over-year as the Company accelerated its investment pace in 2011.

Interest expense and loan fees were approximately $4.6 million during the fourth quarter of 2011 as compared to $2.7 million in the fourth quarter of 2010. The increase is primarily attributed to $1.3 million of interest and fee expense due to the $75.0 million of senior unsecured convertible notes issued on April 15, 2011. Additionally, the Company incurred approximately $271,000 of non cash interest expense attributed to the accretion of the fair value of the conversion feature on the senior notes. The overall cost of the senior unsecured convertible notes is approximately 8.2%, taking into account accretion of the convertible feature.

The Company had a weighted average cost of debt comprised of interest and fees of approximately 6.23% at Dec 31, 2011, versus 6.27% during the fourth quarter of 2010. SBA debentures had a lower weighted average cost of debt on outstanding SBA debentures of approximately 5.0% in the fourth quarter of 2011 versus 6.2% in the fourth quarter of 2010.

Total operating expenses excluding interest expense and loan fees for the fourth quarter of 2011 was approximately $5.8 million, as compared to $5.4 million for the fourth quarter of 2010. This slight increase was primarily attributed higher compensation expenses based on employee related and other general and administrative expenses.

During the fourth quarter, net unrealized appreciation was approximately $7.4 million, primarily attributed to $6.9 million of appreciation on two life science debt investments and $1.5 million of net appreciation on public warrant and equity investments offset by $1.6 million of depreciation on one lower middle market technology debt investment.

Hercules recognized net realized losses of approximately $688,000 in the fourth quarter of 2011 primarily due to the realized loss of approximately $720,000 equity and warrant investment in two technology companies offset by the warrant gains in one technology and one life science company realized as a result of escrow payments relating to prior year M&A transactions.

Cumulative net realized losses on investments since October 2004 to date total approximately $50.1 million, on a GAAP basis. When compared to gross commitments of approximately $2.7 billion over the same period, the net realized loss represents 1.8% of gross commitments, or an annualized loss rate of 25 basis points.

NII – Net Investment Income

NII for the fourth quarter of 2011 was approximately $10.8 million, compared to $8.6 million in the third quarter of 2011 and $9.5 million in the fourth quarter of 2010. This increase was due to a higher average balance of interest-earning investments outstanding during the fourth quarter of 2011. NII per share for the fourth quarter of 2011 was $0.25 based on 43.2 million basic shares outstanding, compared to $0.20 per share based on 43.1 million basic shares outstanding in the third quarter 2011 and $0.24 per share based on 38.9 million basic shares outstanding in the fourth quarter of 2010.

DNOI - Distributable Net Operating Income

DNOI for the fourth quarter was approximately $11.5 million or $0.27 per share, as compared to $9.5 million, or $0.22 per share in the third quarter of 2011 and $10.2 million, or $0.26 per share in the fourth quarter of 2010. DNOI measures Hercules’ operating performance exclusive of employee stock compensation, which represents expense to the Company but does not require settlement in cash. DNOI does include paid-in-kind, or “PIK”, and back-end fees that generally are not payable in cash on a regular basis but rather at investment maturity. Hercules believes disclosing DNOI and the related per share measures are useful and appropriate supplements and not alternatives to GAAP measures for net operating income, net income, earnings per share and cash flows from operating activities.

Dividends

The Board of Directors increased the quarterly cash dividend by 5.0% and declared a cash dividend of $0.23 per share that will be payable on March 15, 2012 to shareholders of record as of March 12, 2012. This dividend would represent the Company’s twenty-sixth consecutive dividend declaration since its initial public offering, bringing the total cumulative dividend declared to date to $6.92 per share.

Hercules’ Board of Directors maintains a variable dividend policy with the objective of distributing four quarterly distributions in an amount that approximates 90 - 100% of our taxable quarterly income or potential annual income for a particular year. In addition, at the end of the year, we may also pay an additional special dividend or fifth dividend; such that we may distribute approximately all of our annual taxable income in the year it was earned, while maintaining the option to spill over our excess taxable income.

The determination of the tax attributes of the Company’s distributions is made annually as of the end of the Company’s fiscal year based upon its taxable income for the full year and distributions paid for the full year. Therefore, a determination made on a quarterly basis may not be representative of the actual tax attributes of its distributions for a full year. The tax attributes of the Company’s distributions for the year ended December 31, 2011 were paid 100% from earnings and profits. There can be no certainty to shareholders that the 2011 determination is representative of what the tax attributes of the Company’s 2012 distributions to shareholders will actually be. The Company’s distributions are intended to be paid from taxable income.

Share Repurchases

In February 2012, the Board of Directors approved extending Hercules’ share repurchase program through August 2012. During the fourth quarter of 2011 the Company did not repurchase shares of its common stock.

Liquidity and Capital Resources

The Company ended the fourth quarter with approximately $184.3 million in liquidity including $64.5 million in cash, and $119.8 million in credit facilities.

As of December 31, 2011, Hercules had approximately $10.2 million in outstanding borrowings under the Wells Fargo credit facility. Hercules has a committed credit facility with Wells Fargo for approximately $75.0 million in initial credit capacity under a $300.0 million accordion credit facility. Additional lenders may be added to the facility over time to reach up to an aggregate of $300.0 million. We expect to continue discussions with various other potential lenders to join the Wells facility; however, there can be no assurances that additional lenders will join the facility.

As of December 31, 2011, Hercules did not have any outstanding borrowings under the Union Bank credit facility. Hercules has access to $55.0 million under the Union Bank facility. Union Bank and RBC Capital Markets have made commitments of $30.0 million and $25.0 million, respectively.

Pricing at December 31, 2011 under the Wells Fargo and Union Bank credit facilities are LIBOR+3.25% with a floor of 5.0%, and LIBOR+2.25% with a floor of 4.0%, respectively.

At December 31, 2011, Hercules had approximately $225.0 million in outstanding debentures under the SBIC program, as part of its total potential maximum debentures of $225.0 million allowed under the SBIC program.

As of December 31, 2011, the Company's asset coverage ratio, under our regulatory requirements as a BDC was 914.6%, excluding SBIC debentures as a result of exemptive relief from the SEC which allows us to exclude all SBA leverage from our asset coverage ratio, and 241.1% when including our SBIC debentures. Based on Hercules' existing stockholders' equity coupled with the Company's ability to exclude all if its SBA leverage from its 200% asset coverage ratio requirement, the Company has the potential capacity on its balance sheet to leverage up to in excess of $650.0 million. However, Hercules does not currently have access to credit facilities to leverage the portfolio to the fullest capacity. There are no assurances that we may be able to find additional lenders to extend or provide additional credit facilities to fully utilize the Company's available borrowing capacity or expand its existing credit facilities.

At December 31, 2011, the Company's debt to equity leverage ratio, excluding all SBA leverage was 18.7%. The same ratio including our SBIC debentures is approximately 70.8% at the end of the fourth quarter of 2011.

Net Asset Value

At December 31, 2011, the Company’s net assets were approximately $431.0 million up 4.5% as compared to $412.5 million as of December 31, 2010.

As of December 31, 2011, net asset value per share was $9.83 on 43.9 million outstanding shares, compared to $9.50 on 43.4 million outstanding shares and $9.61 on 43.9 million shares as of December 31, 2010 and September 30, 2011, respectively. This increase in the fourth quarter of 2011 is primarily attributable to “Net increase in net assets resulting from operations” of $17.6 million in excess of dividends paid of $9.7 million.

Portfolio Asset Quality and Diversification

As of December 31, 2011, grading of the debt portfolio at fair value, excluding warrants and equity investments, was as follows:

Grade 1     $104.5 million or 17.8% of the total portfolio

Grade 2     $403.1 million or 68.8 % of the total portfolio

Grade 3     $70.4 million or 12.0% of the total portfolio

Grade 4     $6.7 million or 1.2 % of the total portfolio

Grade 5     $1.03 million or 0.2 % of the total portfolio

At December 31, 2011, the weighted average loan grade of the portfolio was 2.01 on a scale of 1 to 5, with 1 being the highest quality, compared to 1.96 as of September 30, 2011 and 2.22 as of December 31, 2010. Hercules’ policy is to generally adjust the grading down on its portfolio companies as they approach the need for additional equity capital.

Hercules’ portfolio diversification as of December 31, 2011 was as follows:

Subsequent Events

The table below summarizes our year-to-date closed and pending commitments as follows:

Notes:

In February 2012, Hercules was notified that Facebook Inc. had not exercised its repurchase right with respect to any of the shares and had executed all documents necessary to fully transfer the ownership of the shares to Hercules. In February 2012, Hercules was notified that Facebook Inc. had not exercised its repurchase right with respect to any of the shares and had executed all documents necessary to fully transfer the ownership of the shares to Hercules.

Conference Call

Hercules has scheduled its fourth quarter and full year 2011 financial results conference call for February 29, 2012 at 2:00 p.m. PT (5:00 p.m. ET). To listen to the call, please dial (877) 304-8957 or (408) 427-3709 approximately 10 minutes prior to the start of the call. A taped replay will be made available approximately three hours after the conclusion of the call and will remain available for seven days. To access the replay, please dial (855) 859-2056 or (404) 537-3406 and enter the passcode 43603600.

About Hercules Technology Growth Capital, Inc.:

Hercules Technology Growth Capital (NASDAQ: HTGC), is a NASDAQ traded specialty finance firm providing customized loans to public and private technology-related companies, including clean technology, life science and select lower middle market technology companies at all stages of development. Since inception, Hercules has committed more than $2.7 billion to over 190 companies and is the lender of choice for entrepreneurs, venture capital and private equity firms seeking ideal, customized growth capital financing at all stages of a company’s development to accelerate business growth and reach the next critical milestone.

Companies interested in learning more about financing opportunities should contact info@htgc.com, or call 650.289.3060.

Forward-Looking Statements:

The information disclosed in this release is made as of the date hereof and reflects Hercules most current assessment of its historical financial performance. Actual financial results filed with the Securities and Exchange Commission may differ from those contained herein due to timing delays between the date of this release and confirmation of final audit results. These forward-looking statements are not guarantees of future performance and are subject to uncertainties and other factors that could cause actual results to differ materially from those expressed in the forward-looking statements including, without limitation, the risks, uncertainties, including the uncertainties surrounding the current market volatility, and other factors we identify from time to time in our filings with the Securities and Exchange Commission. Although we believe that the assumptions on which these forward-looking statements are based are reasonable, any of those assumptions could prove to be inaccurate and, as a result, the forward-looking statements based on those assumptions also could be incorrect. You should not place undue reliance on these forward-looking statements. The forward-looking statements contained in this release are made as of the date hereof, and Hercules assumes no obligation to update the forward-looking statements for subsequent events.

HERCULES TECHNOLOGY GROWTH CAPITAL, INC.

CONSOLIDATED STATEMENT OF ASSETS AND LIABILITIES

HERCULES TECHNOLOGY GROWTH CAPITAL, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

HERCULES TECHNOLOGY GROWTH CAPITAL, INC.

NON GAAP FINANCIAL MEASURES

(in thousands, except per share data)

Adjusted net investment income per basic and diluted share, ”Adjusted NII” consists of GAAP net investment income, excluding the impact of dividends paid on unvested restricted common stock divided by the weighted average basic and fully diluted share outstanding for the period under measurement. For reporting purposes, Hercules calculates net investment income per share and change in net assets per share on a basic and fully diluted basis by applying the two-class method, under GAAP. This GAAP method excludes unvested restricted shares and the pro rata earnings associated with the shares from per share calculations.

Hercules believes that providing Adjusted NII affords investors a view of results that may be more easily compared to other companies and enables investors to consider the Company’s results on both a GAAP and Adjusted basis. Adjusted NII should not be considered as an alternative to, as an independent indicator of the Company’s operating performance, or as a substitute for Net Investment Income per basic and diluted share (each computed in accordance with GAAP). Instead, Adjusted NII should be reviewed in connection with Hercules’ consolidated financial statements, to help analyze how the Company is performing. Investors should use Non-GAAP measures only in conjunction with its reported GAAP results.

HERCULES TECHNOLOGY GROWTH CAPITAL, INC.

NON GAAP FINANCIAL MEASURES

(in thousands, except per share data)

Distributable Net Operating Income, “DNOI” represents net investment income as determined in accordance with U.S. generally accepted accounting principles, or GAAP, adjusted for amortization of employee restricted stock awards and stock options. Hercules views DNOI and the related per share measures as useful and appropriate supplements to net operating income, net income, earnings per share and cash flows from operating activities. These measures serve as an additional measure of Hercules’ operating performance exclusive of employee restricted stock amortization, which represents expenses of the Company but does not require settlement in cash. DNOI does include paid-in-kind, or PIK, interest and back end fee income which are generally not payable in cash on a regular basis, but rather at investment maturity or when declared. DNOI should not be considered as an alternative to net operating income, net income, earnings per share and cash flows from operating activities (each computed in accordance with GAAP). Instead, DNOI should be reviewed in connection with net operating income, net income (loss), earnings (loss) per share and cash flows from operating activities in Hercules’ consolidated financial statements, to help analyze how Hercules’ business is performing.

Contact:

Hercules Technology Growth Capital, Inc.

Main, 650.289.3060 HT-HN

info@htgc.com

Sally Borg, 650.289.3066

sborg@htgc.com