SEC Form SC 13G filed

☒	Rule 13d-1(b)
☐	Rule 13d-1(c)
☐	Rule 13d-1(d)

1	NAMES OF REPORTING PERSONS   Select Equity Group, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION   Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER   0
		6	SHARED VOTING POWER   0
		7	SOLE DISPOSITIVE POWER   0
		8	SHARED DISPOSITIVE POWER   0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON   0
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES   ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)   0%
12	TYPE OF REPORTING PERSON   IA

1	NAMES OF REPORTING PERSONS   George S. Loening
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION   USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER   0
		6	SHARED VOTING POWER   0
		7	SOLE DISPOSITIVE POWER   0
		8	SHARED DISPOSITIVE POWER   0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON   0
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES   ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)   0%
12	TYPE OF REPORTING PERSON   IN/HC

Item 1(a)	Name of Issuer:
	BTRS Holdings Inc. (formerly known as South Mountain Merger Corp.)
Item 1(b)	Address of Issuer’s Principal Executive Offices:
	1009 Lenox Drive, Suite 101
	Lawrenceville, New Jersey 08648
Items 2(a)	Name of Person Filing:
	This Schedule 13G is being filed jointly by Select Equity Group, L.P., a Delaware limited partnership (“Select LP”) and George S. Loening (“Loening”), who is the majority owner of Select LP and managing member of its general partner. Select LP and Loening are sometimes jointly referred to herein as the “Select Reporting Persons.”
Item 2(b)	Address of Principal Business Office:
	The business address of each of the Select Reporting Persons is:
	380 Lafayette Street, 6th Floor
	New York, New York 10003
Item 2(c)	Citizenship:
	George S. Loening is a United States citizen.
Item 2(d)	Title of Class of Securities:
	Class A Common Stock
Item 2(e)	CUSIP Number:
	838884104
Item 3	If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b) or (c), check whether the person filing is:

(a)

☐ Broker or dealer registered under Section 15 of the Act;

(b)

☐ Bank as defined in Section 3(a)(6) of the Act;

(c)

☐ Insurance company as defined in Section 3(a)(19) of the Act;

(d)

☐ Investment company registered under Section 8 of the Investment Company Act of 1940;

(e)

☒ An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

(f)

☐ An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);

(g)

☒ A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G);

(h)

☐ A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)

☐ A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940;

(j)

☐ A non-U.S. institution in accordance with Rule 240.13d-1(b)(1)(ii)(J);

(k)

☐ Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).

Item 4	Ownership:
	The information required by Items 4(a)-(c), as of January 13, 2021, is set forth in Rows 5-11 of the cover page hereto for each Select Reporting Person and is incorporated herein by reference for each such Select Reporting Person.
Item 5	Ownership of Five Percent or Less of a Class:
	If this statement is being filed to report the fact that as of the date hereof a reporting person has ceased to be the beneficial owner of more than 5 percent of the class of securities, check the following ☒.
Item 6	Ownership of More than Five Percent on Behalf of Another Person:
	N/A
Item 7	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company:
	See Exhibit 99.1
Item 8	Identification and Classification of Members of the Group:
	N/A
Item 9	Notice of Dissolution of Group:
	N/A
Item 10	Certification: