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<P align="center" style="font-size: 14pt"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION<BR>
<FONT style="font-size: 12pt">Washington, D.C. 20549
</FONT></B>

<P align="center" style="font-size: 18pt"><B>FORM 8-K</B>

<P align="center" style="font-size: 12pt"><B>CURRENT REPORT<BR>
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934</B>

<P align="center" style="font-size: 10pt"><B>Date of Report (Date of earliest event reported): September 26, 2008</B>

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<P align="center" style="font-size: 24pt"><B>ATMI, INC.<BR></B>
<FONT style="font-size: 10pt">(Exact name of registrant as specified in its charter)
</FONT>

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    <TD width="32%">&nbsp;</TD>
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    <TD width="32%">&nbsp;</TD>
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    <TD style="border-bottom: 1px solid #000000"><B>Delaware</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-bottom: 1px solid #000000"><B>1-16239</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-bottom: 1px solid #000000"><B>06-1481060</B></TD>
</TR>
<TR valign="top">
    <TD>(State or other Jurisdiction of Incorporation)</TD>
    <TD>&nbsp;</TD>
    <TD>(Commission File Number)</TD>
    <TD>&nbsp;</TD>
    <TD>(IRS Employer Identification No.)</TD>
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    <TD width="49%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="49%">&nbsp;</TD>
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    <TD style="border-bottom: 1px solid #000000"><B>7 Commerce Drive, Danbury, Connecticut <BR></B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-bottom: 1px solid #000000"><B>06810</B></TD>
</TR>
<TR valign="top">
    <TD>(Address of Principal Executive Offices)</TD>
    <TD>&nbsp;</TD>
    <TD>(Zip Code)</TD>
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<P align="center" style="font-size: 10pt">Registrant&#146;s telephone number, including area code: <B>(203) 794-1100</B>


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    <TD nowrap>(Former name or former address if changed since last report.)</TD>
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<P align="left" style="font-size: 10pt">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:

<P align="left" style="font-size: 10pt">
<FONT face="Wingdings">&#111;</FONT> Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)<BR><BR>
<FONT face="Wingdings">&#111;</FONT> Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)<BR><BR>
<FONT face="Wingdings">&#111;</FONT> Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))<BR><BR>
<FONT face="Wingdings">&#111;</FONT> Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))<BR>


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<P align="center" style="font-size: 10pt; display: none">1
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<DIV align="left" style="font-size: 10pt; margin-top: 10pt"><B>Item&nbsp;2.02. RESULTS OF OPERATIONS AND FINANCIAL CONDITION</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 10pt">On September&nbsp;26, 2008, ATMI, Inc. issued a press release announcing certain preliminary financial
results for the third quarter of 2008. A copy of the press release is furnished as Exhibit&nbsp;99.1 to
this Current Report on Form 8-K and is incorporated herein by reference.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 10pt">The information contained in this Item&nbsp;2.02 of this Current Report on Form 8-K, including Exhibit
99.1 attached hereto, is furnished and shall not be deemed to be &#147;filed&#148; for purposes of Section&nbsp;18
of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that
Section, and shall not be deemed to be incorporated by reference into the filings of the registrant
under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific
reference in such filing.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 10pt"><B>Item&nbsp;9.01. FINANCIAL STATEMENTS AND EXHIBITS</B>
</DIV>


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    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><I>Exhibit </I>&#151;</TD>
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<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left">99.1</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Press Release dated September&nbsp;26, 2008 (ATMI Reduces 2008 Guidance)</TD>
</TR>

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<P align="center" style="font-size: 10pt">&nbsp;

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<DIV align="center" style="font-size: 10pt; margin-top: 10pt"><B>SIGNATURES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 10pt; text-indent: 4%">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.
</DIV>

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    <TD colspan="3" align="left">ATMI, INC.<BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">Date: September 26, 2008&nbsp;</TD>
    <TD valign="top">By:&nbsp;&nbsp;</TD>
    <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">/s/ Timothy C. Carlson
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Timothy C. Carlson&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Executive Vice President, Chief Financial Officer and Treasurer&nbsp;</TD>
    <TD>&nbsp;</TD>
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    <TD colspan="5">&nbsp;</TD>
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<DIV align="center" style="font-size: 10pt; margin-top: 10pt"><B>EXHIBIT INDEX</B>
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    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
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<TR style="font-size: 10pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>No.</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Description</B></TD>
</TR>

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    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">99.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Press Release dated September&nbsp;26, 2008 (ATMI Reduces 2008 Guidance)</TD>
</TR>
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Filed by Bowne Pure Compliance
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 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): September 26, 2008
ATMI, INC.
(Exact name of registrant as specified in its charter)
Delaware
1-16239
06-1481060
(State or other Jurisdiction of Incorporation)
(Commission File Number)
(IRS Employer Identification No.)
7 Commerce Drive, Danbury, Connecticut
06810
(Address of Principal Executive Offices)
(Zip Code)
Registrant's telephone number, including area code:
(203) 794-1100
(Former name or former address if changed since last report.)
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:
o
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
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 September 26, 2008, ATMI, Inc. issued a press release announcing certain preliminary financial
results for the third quarter of 2008. A copy of the press release is furnished as Exhibit 99.1 to
this Current Report on Form 8-K and is incorporated herein by reference.
The information contained in this Item 2.02 of this Current Report on Form 8-K, including Exhibit
99.1 attached hereto, is furnished and shall not be deemed to be "filed" for purposes of Section 18
of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that
Section, and shall not be deemed to be incorporated by reference into the filings of the registrant
under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific
reference in such filing.
Item 9.01. FINANCIAL STATEMENTS AND EXHIBITS
(d)
Exhibit
—
99.1
Press Release dated September 26, 2008 (ATMI Reduces 2008 Guidance)
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.
ATMI, INC.
Date: September 26, 2008
By:
/s/ Timothy C. Carlson
Timothy C. Carlson
Executive Vice President, Chief Financial Officer and Treasurer
3
EXHIBIT INDEX
Exhibit
No.
Description
99.1
Press Release dated September 26, 2008 (ATMI Reduces 2008 Guidance)
4