UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

(Initial Filing)

Under the Securities Exchange Act of 1934

Seratosa Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

81747V109

(CUSIP Number)

July 31, 2014

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

x Rule 13d-1(b)

¨ Rule 13d-1(c)

¨ Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13G

CUSIP No. 81747V109

1.	Name of reporting person I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (entities only) KCG Americas LLC 22-3660471
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     59,461
		6.	Shared voting power     Not applicable
		7.	Sole dispositive power     59,461
		8.	Shared dispositive power     Not applicable
9.	Aggregate amount beneficially owned by each reporting person     59,461
10.	Check box if the aggregate amount in Row (9) excludes certain shares*
11.	Percent of class represented by amount in Row 9 11.43% based on outstanding shares reported in the issuer’s 10-Q filed with the SEC for the period ended March 31, 2014.
12.	Type of reporting person*     BD

ITEM 1	(a).	Name of Issuer
		Seratosa Inc.
ITEM 1	(b).	Address of Issuer’s Principal Executive Offices
		Room 4304, 43/F China Resources Building 26 Harbour Road, Wan Chai Hong Kong HKSAR
ITEM 2	(a).	Names of Persons Filing
		KCG Americas LLC
ITEM 2	(b).	Address of principal business office
		545 Washington Blvd., Jersey City, NJ 07310
ITEM 2	(c).	Citizenship
		Delaware
ITEM 2	(d).	Title of Class of Securities
		Common Stock
ITEM 2	(e).	CUSIP Number
		81747V109
ITEM 3.	If this statement is filed pursuant to Rules 13d-1(b), or 13(d)-2(b), check whether the person filing it is a:
	(a)	x	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

ITEM 4.	Ownership
	(a)	Amount beneficially owned
		59,461
	(b)	Percent of class
		11.43%
	(c)	Number of shares as to which such person has:
		(i)	sole power to vote or to direct the vote
			59,461
		(ii)	shared power to vote or to direct the vote
			Not applicable
		(iii)	sole power to dispose or to direct the disposition of
			59,461
		(iv)	shared power to dispose or to direct the disposition of
			Not applicable
ITEM 5.	Ownership of Five Percent or Less of a Class
	Not applicable
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.	Certification
	By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.
	After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: August 8, 2014

KCG Americas LLC
By:	/s/    Matthew Levine
	Matthew Levine
	Director of Compliance