Sector 10, Inc. (SECI)

[Highland]

Name of reporting person
I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (entities only)

Virtu Americas LLC 26-4219373
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
5,928

6.

Shared voting power

Not applicable

7.

Sole dispositive power
5,928

8.

Shared dispositive power

Not applicable
9.

Aggregate amount beneficially owned by each reporting person
5,928
10.

Check box if the aggregate amount in Row (9) excludes certain shares* ¨

11.

Percent of class represented by amount in Row 9




1.94%
based on outstanding shares as reported on the issuer's 10-Q filed with the SEC for the period ended December 31, 2017.
12.

Type of reporting person*