Filing Details

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

o

Rule 13d-1(b)

o

Rule 13d-1(c)

x

Rule 13d-1(d)

CUSIP No. 83418M103

1

Name of Reporting Person
Solaris Energy Capital, LLC

2

Check the Appropriate Box if a Member of a Group

(a):

o

(b):

x

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
4,413,496 (1)

6

Shared Voting Power
0

7

Sole Dispositive Power
4,413,496 (1)

8

Shared Dispositive Power
0

9

Aggregate Amount Beneficially Owned by Each Reporting Person
4,413,496 (1)
(See Item 4)

10

Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*   o

11

Percent of Class Represented by Amount in Row 9
9.4% (2)
(See Item 4)

12

Type of Reporting Person
OO

Item 1(a).

Name of Issuer:

Solaris Oilfield Infrastructure, Inc.

Item 1(b).

Address of Issuers Principal Executive Offices:

9811 Katy Freeway

Suite 700

Houston, Texas 77024

Item 2(a).

Name of Person Filing:

This Schedule 13G is filed on behalf of Solaris Energy Capital, LLC  (Solaris Energy Capital)

Item 2(b).

Address of Principal Business Office or, if none, Residence:

9811 Katy Freeway

Suite 700

Houston, Texas 77024

Item 2(c).

Citizenship:

Solaris Energy Capital is organized in the State of Delaware.

Item 2(d).

Title of Class of Securities:

Class A Common Stock, par value $.01 per share.

Item 2(e).

CUSIP Number:

83418M103

Item 3.

If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b) or (c), check whether the person filing is a:

(a)

o

Broker or dealer registered under Section 15 of the Exchange Act.

(b)

o

Bank as defined in Section 3(a)(6) of the Exchange Act.

(c)

o

Insurance company as defined in Section 3(a)(19) of the Exchange Act.

(d)

o

Investment company registered under Section 8 of the Investment Company Act.

(e)

o

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

(f)

o

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

(g)

o

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

(h)

o

A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act.

(i)

o

A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act.

(j)

o

Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

Item 4.

Ownership.

Solaris Energy Capital is the beneficial owner of 4,413,496 shares of the Issuers Class B common stock.

Solaris Energy Capital does not beneficially own any shares of the Issuers Class A common stock.

William A. Zartler holds an indirect interest in 4,413,496 shares of Class B common stock through Solaris Energy Capital, LLC. Mr. Zartler is the sole member of Solaris Energy Capital, LLC and has the authority to vote or dispose of the shares held by Solaris Energy Capital, LLC in his sole discretion.

Shares of the Issuers Class B common stock are exchangeable for shares of Class A common stock on a one-for-one basis.

1.

Solaris Energy Capital

a.

Amount beneficially owned:

i.

4,413,496

b.

Percent of class:

i.

9.4%

c.

Number of shares as to which the person has:

i.

Sole power to vote or to direct the vote:

1.     4,413,496

ii.

Shared power to vote or to direct the vote:

1.     0

iii.

Sole power to dispose or to direct the disposition of:

1.     4,413,496

iv.

Shared power to dispose or to direct the disposition of:

1.     0

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 the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following o.

Item 6.

Ownership of More than Five Percent on Behalf of Another Person.

Not Applicable.

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company.

Not Applicable.

Item 8.

Identification and Classification of Members of the Group.

Not Applicable.

Item 9.

Notice of Dissolution of Group.

Not Applicable.

Item 10.

Certifications.

Not Applicable.

Solaris Energy Capital, LLC

By:

/s/ William A. Zartler

Name: William A. Zartler

Title: Sole Member