South Mountain Merger Corp. Contracts & Agreements

Amended and Restated Executive Employment Agreement, dated as of September 19, 2022, by and between the Company and Flint Lane (Filed With SEC on November 7, 2022)

Amended and Restated Executive Employment Agreement, dated as of September 19, 2022, by and between the Company and Mark Shifke (Filed With SEC on November 7, 2022)

Amended and Restated Executive Employment Agreement, dated as of September 19, 2022, by and between the Company and Steven Pinado (Filed With SEC on November 7, 2022)

Amended and Restated Executive Employment Agreement, dated as of September 19, 2022, by and between the Company and Joseph Eng (Filed With SEC on November 7, 2022)

Amended and Restated Executive Employment Agreement, dated as of September 19, 2022, by and between the Company and Jeanne OConnor (Filed With SEC on November 7, 2022)

Agreement and Plan of Merger, dated as of September 28, 2022, by and among BTRS Holdings Inc., Bullseye FinCo, Inc. and Bullseye Merger Sub, Inc (Filed With SEC on September 28, 2022)

Voting and Support Agreement, dated as of September 28, 2022, by and among Bullseye FinCo, Inc., and certain entities affiliated with Bain Capital Venture Investors, LLC (Filed With SEC on September 28, 2022)

Voting and Support Agreement, dated as of September 28, 2022, by and among Bullseye FinCo, Inc., Flint A. Lane, FL 2009 GRAT FBO APL, FL 2009 GRAT FBO KML and FL 2009 GRAT FBO TKL (Filed With SEC on September 28, 2022)

Rollover and Contribution Agreement, dated as of September 28, 2022, by and among Bullseye Holdings, LP, Flint A. Lane, FL 2009 GRAT FBO APL, FL 2009 GRAT FBO KML and FL 2009 GRAT... (Filed With SEC on September 28, 2022)

Rollover and Contribution Agreement, dated as of September 28, 2022, by and among Bullseye Holdings, LP and certain entities affiliated with Bain Capital Venture Investors, LLC (Filed With SEC on September 28, 2022)

Restrictive Covenant Agreement, dated as of September 28, 2022, by and among Bullseye FinCo, Inc. and certain entities affiliated with Bain Capital Venture Investors, LLC (Filed With SEC on September 28, 2022)

Restrictive Covenant Agreement, dated as of September 28, 2022, by and among Bullseye FinCo, Inc., Flint A. Lane, FL 2009 GRAT FBO APL, FL 2009 GRAT FBO KML and FL 2009 GRAT FBO... (Filed With SEC on September 28, 2022)

Form of Executive Severance Plan Including in the Event of a Change of Control (Filed With SEC on May 10, 2022)

Description of Securities of the Registrant (Filed With SEC on March 9, 2022)

Amendment No. 1 to Warrant Agreement, dated December 17, 2021, by and between the Company and Continental Stock Transfer & Trust Company (Filed With SEC on December 17, 2021)

Form of Dealer Manager Agreement (Filed With SEC on November 18, 2021)

Form of Tender and Support Agreement, dated November 17, 2021, by and between the Company and Supporting Stockholders (Filed With SEC on November 18, 2021)

Form of Underwriting Agreement (Filed With SEC on June 30, 2021)

Description of Securities registered under Section 12 of the Securities Exchange Act of 1934 (Filed With SEC on March 24, 2021)

Business Combination Agreement, dated as of October 18, 2020, by and among South Mountain Merger Corp., BT Merger Sub I, Inc., BT Merger Sub II, LLC and Factor Systems, Inc.... (Filed With SEC on January 14, 2021)

Amendment to Business Combination Agreement, dated as of December 13, 2020, by and among South Mountain Merger Corp., BT Merger Sub I, Inc., BT Merger Sub II, LLC and Factor... (Filed With SEC on January 14, 2021)

Form of Common Stock Certificate of the Company (Filed With SEC on January 14, 2021)

Form of Warrant Certificate of the Company (Filed With SEC on January 14, 2021)

Amended and Restated Registration Rights Agreement, dated October 18, 2020, by and among the Company and certain stockholders of the Company (Filed With SEC on January 14, 2021)

Form of Lock-Up Agreement (Filed With SEC on January 14, 2021)

Form of Subscription Agreement, dated as of October 18, 2020, by and between the Company and the investors party thereto (Filed With SEC on January 14, 2021)

Form of Indemnification Agreement by and between the Company and its directors and officers (Filed With SEC on January 14, 2021)

BTRS Holdings Inc. 2020 Equity Incentive Plan (Filed With SEC on January 14, 2021)

BTRS Holdings Inc. Employee Stock Purchase Plan (Filed With SEC on January 14, 2021)

Lease Agreement, dated August 28, 2017, by and between Factor Systems, Inc. (d/b/a Billtrust) and Lenox Drive Office Park LLC (Filed With SEC on January 14, 2021)

First Amendment to Lease Agreement, dated August 28, 2017, by and between Factor Systems, Inc. (d/b/a Billtrust) and Lenox Drive Office Park LLC (Filed With SEC on January 14, 2021)

Employment Agreement between Factor Systems, Inc. (d/b/a Billtrust) and Flint A. Lane dated August 1, 2014, as amended by First Amendment to Employment Agreement dated May 18,... (Filed With SEC on January 14, 2021)

Employment Agreement between Factor Systems, Inc. (d/b/a Billtrust) and Steven Pinado dated March 28, 2018, as amended by First Amendment to Employment Agreement dated October 14,... (Filed With SEC on January 14, 2021)

Employment Agreement between Factor Systems, Inc. (d/b/a Billtrust) and Mark Shifke dated March 10, 2020 (Filed With SEC on January 14, 2021)

Employment Agreement between Factor Systems, Inc. (d/b/a Billtrust) and Joe Eng dated February 24, 2020 (Filed With SEC on January 14, 2021)

Lease Agreement, dated August 28, 2017, by and between Factor Systems, Inc. (d/b/a Billtrust) and Lenox Drive Office Park LLC (Filed With SEC on October 26, 2020)

First Amendment to Lease Agreement, dated August 28, 2017, by and between Factor Systems, Inc. (d/b/a Billtrust) and Lenox Drive Office Park LLC (Filed With SEC on October 26, 2020)

Factor Systems, Inc. (d/b/a Billtrust) 2003 Stock Incentive Plan (Filed With SEC on October 26, 2020)

Factor Systems, Inc. (d/b/a Billtrust) 2014 Incentive Compensation Plan (Filed With SEC on October 26, 2020)

Business Combination Agreement, dated as of October 18, 2020, by and among South Mountain Merger Corp., BT Merger Sub I, Inc., BT Merger Sub II, LLC and Factor Systems, Inc.... (Filed With SEC on October 19, 2020)

Description of Securities (Filed With SEC on March 20, 2020)

Underwriting Agreement, dated June 19, 2019, between the Company and Citigroup Global Markets Inc., as underwriter (Filed With SEC on June 25, 2019)

Warrant Agreement, June 19, 2019, between the Company and Continental Stock Transfer & Trust Company, as warrant agent (Filed With SEC on June 25, 2019)

Letter Agreement, dated June 19, 2019, among the Company, its officers and directors and South Mountain LLC (Filed With SEC on June 25, 2019)

Investment Management Trust Agreement, dated June 19, 2019, between the Company and Continental Stock Transfer & Trust Company, as trustee (Filed With SEC on June 25, 2019)

Registration Rights Agreement, dated June 19, 2019, among the Company and certain other security holders named therein (Filed With SEC on June 25, 2019)

Private Placement Warrant Purchase Agreement, dated June 19, 2019, between the Company and South Mountain LLC (Filed With SEC on June 25, 2019)

Indemnity Agreement, dated June 19, 2019, between the Company and Charles B. Bernicker (Filed With SEC on June 25, 2019)

Indemnity Agreement, dated June 19, 2019, between the Company and Nicholas Dermatas (Filed With SEC on June 25, 2019)

Indemnity Agreement, dated June 19, 2019, between the Company and Robert L. Metzger (Filed With SEC on June 25, 2019)

Indemnity Agreement, dated June 19, 2019, between the Company and Douglas J. Pauls (Filed With SEC on June 25, 2019)

Administrative Services Agreement, dated June 19, 2019, between the Company and an affiliate of South Mountain LLC (Filed With SEC on June 25, 2019)

Form of Underwriting Agreement (Filed With SEC on June 17, 2019)

Specimen Unit Certificate (Filed With SEC on May 31, 2019)

Specimen Class A Common Stock Certificate (Filed With SEC on May 31, 2019)

Specimen Warrant Certificate (included in Exhibit 4.4) (Filed With SEC on May 31, 2019)

Promissory Note, dated April 19, 2019, issued to South Mountain LLC (Filed With SEC on May 31, 2019)

Form of Letter Agreement among the Registrant and the Registrants officers and directors and South Mountain LLC and its members (Filed With SEC on May 31, 2019)

Form of Investment Management Trust Agreement between Continental Stock Transfer & Trust Company and the Registrant (Filed With SEC on May 31, 2019)

Form of Registration Rights Agreement between the Registrant and certain security holders (Filed With SEC on May 31, 2019)

Securities Subscription Agreement, dated April 19, 2019, between the Registrant and South Mountain LLC (Filed With SEC on May 31, 2019)

Warrants Subscription Agreement between the Registrant and South Mountain LLC (Filed With SEC on May 31, 2019)

Form of Indemnity Agreement (Filed With SEC on May 31, 2019)

Form of Administrative Services Agreement, by and between the Registrant and an affiliate of South Mountain LLC (Filed With SEC on May 31, 2019)

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South Mountain Merger Corp. Contracts & Agreements