<HTML>
<HEAD>
<TITLE></TITLE>
</HEAD>
<BODY>


<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 12pt; margin-bottom: 3pt"><DIV STYLE="font-size: 1pt; border-top: Black 2pt solid; border-bottom: Black 1pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>UNITED STATES</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>SECURITIES
AND EXCHANGE COMMISSION</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Washington, DC 20549</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>FORM 8-K</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>CURRENT REPORT</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Pursuant to Section 13 or 15(d)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>of the Securities Exchange Act of 1934</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">Date of Report (Date of earliest event reported):
<B>July 16, 2013</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>CAS MEDICAL
SYSTEMS, INC.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">(Exact name of Registrant as specified in its
charter)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Delaware</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">(State or other jurisdiction</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">of incorporation)</P></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>0-13839</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">(Commission File Number)</P></TD>
    <TD COLSPAN="2" STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>06-1123096</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">(I.R.S. Employer</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">Identification No.)</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD COLSPAN="4" STYLE="padding-right: 5.4pt; padding-left: 5.4pt"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>44 East Industrial Road, Branford, Connecticut 06405</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">(Address of principal executive offices, including zip code)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>(203) 488-6056</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">(Registrant's telephone number, including area code)</P>

 </TD></TR>
<TR STYLE="vertical-align: top">
    <TD COLSPAN="3" STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"></TD></TR>
<TR>
    <TD STYLE="width: 34%">&nbsp;</TD>
    <TD STYLE="width: 33%">&nbsp;</TD>
    <TD STYLE="width: 33%">&nbsp;</TD>
    <TD STYLE="width: 0%">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (<I>see</I> General Instruction
A.2. below):</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">[ &nbsp;] Written communications pursuant to Rule 425 under the Securities
Act (17 CFR 230.425)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">[ &nbsp;] Soliciting material pursuant to Rule 14a-12 under the Exchange
Act (17 CFR 240.14a-12)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">[ &nbsp;] Pre-commencement communications pursuant to Rule 14d-2(b) under
the Exchange Act (17 CFR 240.14d-2(b))</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">[ &nbsp;] Pre-commencement communications pursuant to Rule 13e-4(c) under
the Exchange Act (17 CFR 240.13e-4(c))</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></P>

<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 3pt; margin-bottom: 12pt"><DIV STYLE="font-size: 1pt; border-top: Black 1pt solid; border-bottom: Black 2pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></P>




<!-- Field: Page; Sequence: 1 -->
    <DIV STYLE="margin-top: 6pt; margin-bottom: 6pt; padding-bottom: 12pt; border-bottom: Black 1pt solid"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif"><TR><TD STYLE="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo; Options: Hidden -->&nbsp;<!-- Field: /Sequence --></TD></TR></TABLE></DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <!-- Field: /Page -->


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0in"><BR>
<B>Item 2.02. Results of Operations and Financial
Condition.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in">On July 16, 2013, CAS Medical Systems, Inc.
(the &#8220;Company&#8221;) filed a Preliminary Prospectus Supplement pursuant to Rule 424(b)(5) of the Securities Act of 1933,
as amended (the &#8220;Securities Act&#8221;), which contained the following information on page S-2 thereof:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0.5in; text-align: justify; text-indent: 0in">We have completed our
second fiscal quarter ended June 30, 2013. Although we have not yet finalized and announced our consolidated financial results
for the second quarter of 2013, our preliminary financial data reflect revenues of approximately $5.0 million for the quarter,
consisting of $2.2 million from sales of Tissue Oximetry Monitoring products, an increase of approximately 15% from the same period
in the prior year, and $2.8 million from sales of our Traditional Monitoring products, a decrease of approximately 13% from the
same period in the prior year. We expect to announce a net loss for the quarter ended June 30, 2013.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0in"><B>Item 7.01. Regulation FD Disclosure.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in">On July 16, 2013, the Company issued a press
release announcing a proposed underwritten public offering of its common stock. A copy of the press release is attached as Exhibit
99.1 to this Current Report on Form 8-K and is incorporated herein by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in">The Company is furnishing the information in
this Current Report on Form 8-K to comply with Regulation FD. Such information, including Exhibit 99.1, shall not be deemed
&#8220;filed&#8221; for any purpose, including for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended
(the &#8220;Exchange Act&#8221;), or otherwise subject to the liabilities of that Section. The information in this Current Report on Form 8-K, including
Exhibit 99.1, shall not be deemed incorporated by reference into any filing under the Securities Act or the Exchange Act, regardless
of any general incorporation language in such filings.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Item 9.01. Financial Statements and Exhibits.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">(d) Exhibits.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 13%; font-size: 10pt"><FONT STYLE="font-size: 10pt; color: black"><U>Exhibit</U></FONT></TD>
    <TD STYLE="width: 87%; font-size: 10pt"><FONT STYLE="font-size: 10pt; color: black"><U>Description</U></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">99.1</P></TD>
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">Press Release dated July 16, 2013</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt"></TD>
    <TD STYLE="font-size: 10pt"></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0in">&nbsp;</P>


<!-- Field: Page; Sequence: 2 -->
    <DIV STYLE="margin-top: 6pt; margin-bottom: 6pt; padding-bottom: 12pt; border-bottom: Black 1pt solid"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif"><TR><TD STYLE="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->2<!-- Field: /Sequence --></TD></TR></TABLE></DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <!-- Field: /Page -->


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-right: 0; margin-bottom: 0; text-align: center"><BR>
<B>SIGNATURES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: center; text-indent: -0.5in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in">Pursuant to the requirements of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-indent: -0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-indent: -0.5in">&nbsp;</P>

<TABLE BORDER="0" CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD COLSPAN="2">CAS MEDICAL SYSTEMS,
INC.</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; width: 50%">&nbsp;</TD>
    <TD STYLE="width: 4%">By:&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 46%">/s/ Jeffery A. Baird</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top; border-top: #000000 1px solid">Jeffery A. Baird<BR>Chief Financial Officer</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; text-indent: 0pt; margin-top: 0pt; margin-bottom: 6pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; text-indent: 0pt; margin-top: 0pt; margin-bottom: 6pt">Date:&nbsp;&nbsp;July
16, 2013&nbsp;<BR>
<BR>
<BR>
</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<!-- Field: Page; Sequence: 3; Options: Last -->
    <DIV STYLE="margin-top: 6pt; margin-bottom: 6pt; padding-bottom: 12pt; border-bottom: Black 1pt solid"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif"><TR><TD STYLE="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->3<!-- Field: /Sequence --></TD></TR></TABLE></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></P>


</BODY>
</HTML>
[{"type": "8-K", "sequence": "1", "filename": "t1300195_8k.htm", "description": "FORM 8-K", "secsgml_size_bytes": 15340}]
{"company-data": {"conformed-name": "CAS MEDICAL SYSTEMS INC", "cik": "0000764579", "assigned-sic": "3841", "irs-number": "061123096", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-13839", "film-number": "13970655"}, "business-address": {"street1": "44 EAST INDUSTRIAL ROAD", "city": "BRANFORD", "state": "CT", "zip": "06405", "phone": "2034886056"}, "mail-address": {"street1": "44 EAST INDUSTRIAL ROAD", "city": "BRANFORD", "state": "CT", "zip": "06405"}}
UNITED STATES
SECURITIES
AND EXCHANGE COMMISSION
Washington, DC 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported):
July 16, 2013
CAS MEDICAL
SYSTEMS, INC.
(Exact name of Registrant as specified in its
charter)
Delaware
(State or other jurisdiction
of incorporation)
0-13839
(Commission File Number)
06-1123096
(I.R.S. Employer
Identification No.)
44 East Industrial Road, Branford, Connecticut 06405
(Address of principal executive offices, including zip code)
(203) 488-6056
(Registrant's telephone number, including area code)
Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (
see
General Instruction
A.2. below):
[  ] Written communications pursuant to Rule 425 under the Securities
Act (17 CFR 230.425)
[  ] Soliciting material pursuant to Rule 14a-12 under the Exchange
Act (17 CFR 240.14a-12)
[  ] Pre-commencement communications pursuant to Rule 14d-2(b) under
the Exchange Act (17 CFR 240.14d-2(b))
[  ] Pre-commencement communications pursuant to Rule 13e-4(c) under
the Exchange Act (17 CFR 240.13e-4(c))
Item 2.02. Results of Operations and Financial
Condition.
On July 16, 2013, CAS Medical Systems, Inc.
(the "Company") filed a Preliminary Prospectus Supplement pursuant to Rule 424(b)(5) of the Securities Act of 1933,
as amended (the "Securities Act"), which contained the following information on page S-2 thereof:
We have completed our
second fiscal quarter ended June 30, 2013. Although we have not yet finalized and announced our consolidated financial results
for the second quarter of 2013, our preliminary financial data reflect revenues of approximately $5.0 million for the quarter,
consisting of $2.2 million from sales of Tissue Oximetry Monitoring products, an increase of approximately 15% from the same period
in the prior year, and $2.8 million from sales of our Traditional Monitoring products, a decrease of approximately 13% from the
same period in the prior year. We expect to announce a net loss for the quarter ended June 30, 2013.
Item 7.01. Regulation FD Disclosure.
On July 16, 2013, the Company issued a press
release announcing a proposed underwritten public offering of its common stock. A copy of the press release is attached as Exhibit
99.1 to this Current Report on Form 8-K and is incorporated herein by reference.
The Company is furnishing the information in
this Current Report on Form 8-K to comply with Regulation FD. Such information, including Exhibit 99.1, shall not be deemed
"filed" for any purpose, including for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), or otherwise subject to the liabilities of that Section. The information in this Current Report on Form 8-K, including
Exhibit 99.1, shall not be deemed incorporated by reference into any filing under the Securities Act or the Exchange Act, regardless
of any general incorporation language in such filings.
Item 9.01. Financial Statements and Exhibits.
(d) Exhibits.
Exhibit
Description
99.1
Press Release dated July 16, 2013
2
SIGNATURES
Pursuant to the requirements of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
CAS MEDICAL SYSTEMS,
INC.
By:
/s/ Jeffery A. Baird
Jeffery A. Baird
Chief Financial Officer
Date:  July
16, 2013
3