Manufacturing. Accelerated.

Disclaimer (cont'd) Participants in Solicitation Trine and Desktop Metal and their respective directors and officers may be deemed to be participants in the solicitation of proxies from Trine's stockholders in connection with the Proposed Business Combination. Information about Trine's directors and executive officers and their ownership of Trine's securities is set forth in Trine's filings with the SEC, including Trine's Annual Report on Form 10-K for the fiscal year ended December 31, 2019, which was filed with the SEC on March 26, 2020. To the extent that holdings of Trine's securities have changed since the amounts printed in Trine's Annual Report on Form 10-K for the fiscal year ended December 31, 2019, which was filed with the SEC on March 26, 2020, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC. Additional information regarding the interests of those persons and other persons who may be deemed participants in the Proposed Business Combination may be obtained by reading. the proxy statement/consent solicitation statement/prospectus regarding the Proposed Business Combination when it becomes available. You may obtain free copies of these documents as described in the preceding paragraph. Industry and Market Data This presentation has been prepared by Desktop Metal and Trine and includes market data and other statistical information from sources believed by Desktop Metal and Trine to be reliable, including independent industry publications, governmental publications or other published independent sources. Some data is also based on the good faith estimates of Desktop Metal or Trine, which in each case are derived from its review of internal sources as well as the independent sources described above. Although Desktop Metal and Trine believe these sources are reliable, Desktop Metal and Trine have not independently verified the information and cannot guarantee its accuracy and completeness. Financial Information; Non-GAAP Financial Measures The financial information and data contained in this Presentation is unaudited and does not conform to Regulation S-X. Accordingly, such information and data may not be included in, may be adjusted in or may be presented differently in the Registration Statement to be filed by Trine with the SEC and the proxy statement/consent solicitation statement/prospectus contained therein. some of the financial information and data contained in this Presentation, such as Adjusted EBITDA and free cash flow, has not been prepared in accordance with United States generally accepted accounting principles ("GAAP"). Desktop and Trine believe these non-GAAP measures of financial results provide useful information to management and investors regarding certain financial and business trends relating to Desktop Metal's financial condition and results of operations. Desktop Metal's management uses these non-GAAP measure for trend analyses and for budgeting and planning purposes. Desktop Metal and Trine believe that the use of these non-GAAP financial measures provides an additional tool for investors to use in comparing Desktop Metal's financial condition and results of operations with other similar companies, many of which present similar non-GAAP financial measures to investors. Management does not consider these non-GAAP measures in isolation or as an alternative to financial measures determined in accordance with GAAP. The principal limitation of these non-GAAP financial measures is that they exclude significant expenses and income that are required by GAAP to be recorded in Desktop Metal's financial statements. In addition, they are subject to inherent limitations as they reflect the exercise of judgments by management about which expenses and income are excluded and included in determining these non-GAAP financial measures. In order to compensate for these limitations, management presents non-GAAP financial measures in connection with GAAP results. You should review Desktop Metal's audited financial statements, which will be included in the Registration Statement. No Offer or Solicitation This Presentation shall not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification. under the securities laws of any such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of the U.S. Securities Act of 1933, as amended. Use of Projections This Presentation contains projected financial information with respect to Desktop Metal and Trine. Such projected financial information constitutes forward-looking information, and is for illustrative purposes only and should not be relied upon as necessarily being indicative of future results. The assumptions and estimates underlying such financial forecast information are inherently uncertain and are subject to a wide variety of significant business, economic, competitive and other risks and uncertainties. See "Forward-Looking Statements" above. Actual results may differ materially from the results contemplated by the financial forecast information contained in this Presentation, and the inclusion of such information in this Presentation should not be regarded as a representation by any person that the results reflected in such forecasts are achieved. Trademarks This Presentation contains trademarks, service marks, trade names and copyrights of Trine, Desktop and other companies, which are the property of their respective owners. D Desktop Metal 3

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