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NEW YORK, Oct. 19, 2020 /PRNewswire/ --WeissLaw LLPis investigating possible breaches of fiduciary duty and other violations of law by the board of directors of South Mountain Merger Corp. ("SMMCU" or the "Company") (NASDAQ: SMMCU) in connection with the Company's proposed merger with privately-held software company Billtrust. Under the terms of the merger agreement, SMMCU will acquire Billtrust through a reverse merger that will result in Billtrust becoming a public company listed on the Nasdaq Capital Market operating under the name BTRS Holdings Inc.The proposed transaction values Billtrust at $1.3 billion. If you own SMMCU shares and wish to discuss this investigation or have any questions concerning this notice or your rights or interests, visit our website: http://www.weisslawllp.com/SMMCU/ Or please contact:Joshua Rubin, Esq.WeissLaw LLP1500 Broadway, 16th FloorNew York, NY 10036(212)682-3025(888) 593-4771[emailprotected] WeissLaw is investigating whether SMMCU's board acted in the best interest of the Company's public shareholders in agreeing to the proposed transaction, whether the board was fully informed as to the valuation of Billtrust, whether the deal's equity split is fair to SMMCU shareholders, and whether all information regarding the valuation of the transaction will be fully and fairly disclosed to SMMCU's public shareholders. WeissLaw LLP has litigated hundreds of stockholder class and derivative actions for violations of corporate and fiduciary duties. We have recovered over a billion dollars for defrauded clients and obtained important corporate governance relief in many of these cases. If you have information or would like legal advice concerning possible corporate wrongdoing (including insider trading, waste of corporate assets, accounting fraud, or materially misleading information), consumer fraud (including false advertising, defective products, or other deceptive business practices), or anti-trust violations, please email us at [emailprotected] SOURCE WeissLaw LLP Related Links http://weisslawllp.com

Answer: SHAREHOLDER ALERT: WeissLaw LLP Investigates South Mountain Merger Corp.