CUSIP No. 833445109 SCHEDULE 13G Page 32 of 36 Pages

EXHIBIT 99.1

JOINT FILING AGREEMENT

Each of the undersigned, pursuant to Rule 13d-1(k)(1) under the Act, hereby agrees and acknowledges that only one statement containing the information required by Schedule 13G need be filed with respect to the ownership by each of the undersigned of the Class A Common Stock and the information required by this Schedule 13G, to which this Agreement is attached as an exhibit, is filed on behalf of them. The undersigned further agree that any further amendments or supplements thereto shall also be filed on behalf of each of them.

Dated: February 16, 2021

ICONIQ Strategic Partners III, L.P., a Cayman
Islands exempted limited partnership
By:	ICONIQ Strategic Partners III GP, L.P., a
	Cayman Islands Exempted limited partner, its General Partner
By:	ICONIQ Strategic Partners III TT GP, Ltd, a
	Cayman Islands exempted company, its General Partner
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person
ICONIQ Strategic Partners III-B, L.P., a Cayman
Islands exempted limited partnership
By:	ICONIQ Strategic Partners III GP, L.P., a
	Cayman Islands exempted limited partnership, its General Partner
By:	ICONIQ Strategic Partners III TT GP, Ltd., a
	Cayman Islands exempted company, its General Partner
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person
ICONIQ Strategic Partners III Co-Invest, L.P., a
Delaware series limited partnership, Series SF
By:	ICONIQ Strategic Partners III GP, L.P., a
	Cayman Islands exempted limited partnership, its General Partner
By:	ICONIQ Strategic Partners III TT GP, Ltd., a
	Cayman Islands exempted company, its General Partner
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person

CUSIP No. 833445109 SCHEDULE 13G Page 33 of 36 Pages

ICONIQ Strategic Partners IV, L.P., a Cayman
Islands exempted limited partnership
By:	ICONIQ Strategic Partners IV GP, L.P., a
	Cayman Islands exempted limited partnership, its General Partner
By:	ICONIQ Strategic Partners IV TT GP, Ltd., a
	Cayman Islands exempted company, its General Partner
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person
ICONIQ Strategic Partners IV-B, L.P., a
Cayman Islands exempted limited partnership
By:	ICONIQ Strategic Partners IV GP, L.P., a
	Cayman Islands exempted limited partnership, its General Partner
By:	ICONIQ Strategic Partners IV TT GP, Ltd.,
	a Cayman Islands exempted company, its General Partner
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person
ICONIQ Strategic Partners V, L.P., a Cayman
Islands exempted limited partnership
By:	ICONIQ Strategic Partners V GP, L.P., a
	Cayman Islands exempted limited partnership, its General Partner
By:	ICONIQ Strategic Partners V TT GP, Ltd.,
	a Cayman Islands exempted company, its General Partner
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person

CUSIP No. 833445109 SCHEDULE 13G Page 34 of 36 Pages

ICONIQ Strategic Partners V-B, L.P., a Cayman Islands exempted limited partnership
By:	ICONIQ Strategic Partners V GP, L.P., a
	Cayman Islands exempted limited partnership, its General Partner
By:	ICONIQ Strategic Partners V TT GP, Ltd.,
	a Cayman Islands exempted company, its General Partner
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person
ICONIQ Strategic Partners III GP, L.P., a Cayman Islands exempted limited partnership
By:	ICONIQ Strategic Partners III TT GP, Ltd., a
	Cayman Islands exempted company, its General Partner
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person
ICONIQ Strategic Partners III TT GP, Ltd., a Cayman Islands exempted company
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person

CUSIP No. 833445109 SCHEDULE 13G Page 35 of 36 Pages

ICONIQ Strategic Partners IV GP, L.P., a
Cayman Islands exempted limited partnership
By:	ICONIQ Strategic Partners IV TT GP, Ltd.,
	a Cayman Islands exempted company, its General Partner
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person
ICONIQ Strategic Partners IV TT GP, Ltd., a
Cayman Islands exempted company
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person
ICONIQ Strategic Partners V GP, L.P., a
Cayman Islands exempted limited partnership
By:	ICONIQ Strategic Partners V TT GP, Ltd.,
	a Cayman Islands exempted company, its General Partner
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person
ICONIQ Strategic Partners V TT GP, Ltd., a
Cayman Islands exempted company
By:	Kevin Foster
Title:	Authorized Person
/s/ Kevin Foster
Signature of Reporting Person
Divesh Makan
/s/ Divesh Makan
Signature of Reporting Person

CUSIP No. 833445109 SCHEDULE 13G Page 36 of 36 Pages

William J.G. Griffith

/s/ William J.G. Griffith

Signature of Reporting Person

Matthew Jacobson

/s/ Matthew Jacobson

Signature of Reporting Person