Exhibit 99.1

CM Finance Inc - Portfolio Update as of December 31, 2014

In light of the recent volatility in the energy sector, CM Finance Inc (Nasdaq: CMFN) (“CMFN” or “the Company”) is providing preliminary information related to its investment portfolio as of the second fiscal quarter ended December 31, 2014. The Company intends to issue its regularly scheduled earnings release and host an earnings call for the second fiscal quarter ended December 31, 2014, to be announced at a later date in February 2015. Although the Company is announcing preliminary information related to its investment portfolio as of the second fiscal quarter ended December 31, 2014 separate from its regularly scheduled earnings release for the second fiscal quarter ended December 31, 2014, it does not undertake to announce updates as of a particular quarter-end apart from its regularly scheduled earnings release and call in the future.

The aggregate investment portfolio at fair value on December 31, 2014 was $316.1 million, compared to $298.7 million at September 30, 2014. Cash balance at December 31, 2014 was $32.9 million, compared with $30.1 million on September 30, 2014. Total debt outstanding on December 31, 2014 was $141.4 million, compared with $123.5 million on September 30, 2014. In addition, the Company had $4.6 million in distributions payable at both September 30 and December 31, 2014.

As of December 31, 2014, the Company had net unrealized gains of approximately $4.6 million, comprised primarily of $10.6 million unrealized gain from its investment in Virgin America Inc. (Nasdaq: VA) (“Virgin America”), offset by unrealized losses from its energy investments (oil and gas and oilfield services) and net unrealized losses across various other sectors of approximately $4.5 million and $1.5 million, respectively.

During the three months ended December 31, 2014, the Company recorded approximately $1.0 million in realized gains and no realized losses. The Company recorded a net unrealized gain of approximately $2.4 million during the three months ended December 31, 2014, which included a $10.6 million unrealized gain on Virgin America and a $4.6 million (2.3% of net assets at September 30, 2014) unrealized loss on its energy investments.

In November 2014, the Company converted its debt and warrant position in Virgin America Inc. to cash and 570,917 shares of common stock of Virgin America, in connection with Virgin America’s initial public offering. The Company’s shares of Virgin America are subject to a six month “lock-up” that expires on May 13, 2015. Further details on the Company’s investment in Virgin America are as follows:

During the three months ended December 31, 2014, the Company made investments in two new portfolio companies. In October 2014, the Company invested $15.0 million in Bird Electric, a Texas-based utility service provider, which serves the oil and gas and regulated electricity distribution industries and provides storm relief services primarily across the south and southeastern United States. In December 2014, the Company invested $20.0 million in A.S.V., Inc., a manufacturer of skid steer loaders and compact track loaders, which serve the construction and building industries.

During the three months ended December 31, 2014, in addition to the Virgin America transaction discussed above, the Company fully realized investments in two portfolio companies. In November 2014, the Company sold its $2.0 million investment in Ikaria Acquisition, Inc. at a price of 101.5% of par. In December 2014, the Company’s $12.0 million investment in CT Technologies Intermediate Holdings, Inc. was prepaid at par plus a prepayment premium of 2%.

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CM Finance Inc and subsidiaries

Consolidated Schedule of Investments

(Unaudited)

December 31, 2014

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CM Finance Inc and subsidiaries

Consolidated Schedule of Investments (continued)

(Unaudited)

December 31, 2014

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Portfolio Composition Tables (Unaudited)

The composition of the Company’s investments as of December 31, 2014, as a percentage of total portfolio at amortized cost and fair value, are as follows:

The following table shows the portfolio by industry grouping at fair value at December 31, 2014:

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About CM Finance Inc

The Company is an externally-managed, closed-end, non-diversified management investment company that has elected to be regulated as a business development company under the Investment Company Act of 1940. The Company’s investment objective is to maximize the total return to its stockholders in the form of current income and capital appreciation through debt and related equity investments by targeting investment opportunities with favorable risk-adjusted returns. The Company seeks to invest primarily in middle-market companies that have annual revenues of at least $50 million and earnings before interest, taxes, depreciation and amortization of at least $15 million. The Company’s investment activities are managed by its investment adviser, CM Investment Partners LLC. To learn more about CM Finance Inc, please visit www.cmfn-inc.com.

Forward-Looking Statements

Statements included herein may contain “forward-looking statements,” which relate to future performance or financial condition. Statements other than statements of historical facts included in this press release may constitute forward-looking statements and are not guarantees of future performance or results and involve a number of assumptions, risks and uncertainties, which change over time. Actual results may differ materially from those anticipated in any forward-looking statements as a result of a number of factors, including those described from time to time in filings by the Company with the Securities and Exchange Commission. The Company undertakes no duty to update any forward-looking statement made herein except as required by law. All forward-looking statements speak only as of the date of this press release.

Contacts

CM Finance Inc

Investor Relations

Email: investorrelations@cmfn-inc.com

Phone: 212-257-5199

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