<SEC-DOCUMENT>0001193125-19-002169-index.html : 20190104
<SEC-HEADER>0001193125-19-002169.hdr.sgml : 20190104
<ACCEPTANCE-DATETIME>20190104113437
ACCESSION NUMBER:		0001193125-19-002169
CONFORMED SUBMISSION TYPE:	N-CSR
PUBLIC DOCUMENT COUNT:		10
CONFORMED PERIOD OF REPORT:	20181031
FILED AS OF DATE:		20190104
DATE AS OF CHANGE:		20190104
EFFECTIVENESS DATE:		20190104

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK SERIES, INC.
		CENTRAL INDEX KEY:			0001062806
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		N-CSR
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-08797
		FILM NUMBER:		19508867

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			09809
		BUSINESS PHONE:		800-441-7762

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			09809

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MERCURY FUNDS INC
		DATE OF NAME CHANGE:	20010827

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MERCURY ASSET MANAGEMENT FUNDS INC
		DATE OF NAME CHANGE:	19980714

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MERCURY ALPHA FUND INC
		DATE OF NAME CHANGE:	19980601
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0001062806
<SERIES-ID>S000002291
<SERIES-NAME>BlackRock International Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000005981
<CLASS-CONTRACT-NAME>Investor A
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000005983
<CLASS-CONTRACT-NAME>Investor C
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000005984
<CLASS-CONTRACT-NAME>Institutional
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000101856
<CLASS-CONTRACT-NAME>Class R Shares
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000198221
<CLASS-CONTRACT-NAME>Class K
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>N-CSR
<SEQUENCE>1
<FILENAME>d619053dncsr.htm
<DESCRIPTION>BLACKROCK SERIES, INC.
<TEXT>
Document 1 - file: d619053dncsr.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>2
<FILENAME>d619053dex99cert.htm
<DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 302
<TEXT>
Document 2 - file: d619053dex99cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.906CERT
<SEQUENCE>3
<FILENAME>d619053dex99906cert.htm
<DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 906
<TEXT>
Document 3 - file: d619053dex99906cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g619053dsp5.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g619053dsp5.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g619053ff.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g619053ff.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g619053g65b16.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g619053g65b16.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g619053logo_07.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g619053logo_07.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g619053photo_01mips.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g619053photo_01mips.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g619053sig_01mips.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g619053sig_01mips.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>g619053snap4.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: g619053snap4.jpg

</DOCUMENT>
</SEC-DOCUMENT>