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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): December 17, 2008</B>

<P align="center">

<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>
    <TD width="1%">&nbsp;</TD>
    <TD width="33%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <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>
</TR>
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    <TD width="49%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="49%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <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>
</TR>
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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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</TR>
<TR>
    <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="left" style="font-size: 10pt"><B>Item&nbsp;5.03. AMENDMENTS TO ARTICLES OF INCORPORATION OR BYLAWS; CHANGE IN FISCAL YEAR</B>


<P align="left" style="font-size: 10pt"><U>Amendment of ATMI, Inc. Bylaws</U>


<P align="left" style="font-size: 10pt; text-indent: 4%">On December&nbsp;17, 2008, the Board of Directors of ATMI, Inc. (the &#147;Company&#148;) approved revisions to Section&nbsp;2.9 of
the ATMI, Inc. Bylaws and the addition of a new Section&nbsp;3.15 of the ATMI, Inc. Bylaws in order to: (i)&nbsp;require
disclosure of additional information in connection with submission of a proposal by a stockholder including nomination
of a person for election as a director, including the class and number of shares owned (beneficially and of record) by
the stockholder; a description of any agreements the stockholder has with affiliates or third parties concerning the
stockholder proposal or director nomination; a description of any derivative or short positions, profit interests,
options, hedging transactions, and borrowed or loaned shares the stockholder has with respect to the Company&#146;s stock; a
representation that the stockholder is entitled to vote at the meeting and intends to attend the meeting to present the
proposal or director nomination; and whether the stockholder intends to conduct a proxy solicitation; and (ii)&nbsp;require
a stockholder nominating a person for election as a director to include in the advance notice certain biographical
information about each director nominee as well as a questionnaire completed by each director nominee that requires the
nominee to disclose any voting commitments the nominee may have with a third person and commit to comply with the
Company&#146;s corporate governance standards if elected.


<P align="left" style="font-size: 10pt; text-indent: 4%">The foregoing summary description of the Bylaw amendments is qualified in its entirety by reference to the Amended
and Restated Bylaws, a complete copy of which are filed as Exhibit&nbsp;3.1 hereto, and incorporated herein by reference.


<P align="left" style="font-size: 10pt"><B>Item&nbsp;5.05. AMENDMENTS TO THE REGISTRANT&#146;S CODE OF ETHICS, OR WAIVER OF A PROVISION OF THE CODE OF ETHICS</B>


<P align="left" style="font-size: 10pt"><U>Amendments to ATMI, Inc. Business Code of Conduct</U>


<P align="left" style="font-size: 10pt; text-indent: 4%">On December&nbsp;17, 2008, the Board of Directors of ATMI, Inc. approved revisions to the ATMI, Inc. Business Code of
Conduct. The proposed revisions implement non-substantive, clarifying changes to more accurately reflect applicable
personnel and related matters within the Company, including the appointment of a Chief Compliance Officer,
reconstitution of the Compliance Committee and revisions to records management practices, and to accord with best
compliance practices.


<P align="left" style="font-size: 10pt; text-indent: 4%">The foregoing summary description of the amendments to the ATMI, Inc. Business Code of Conduct is qualified in its
entirety by reference to the amended ATMI, Inc. Business Code of Conduct, a complete copy of which is filed as Exhibit
14.1 hereto, and incorporated herein by reference.


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

<P align="center" style="font-size: 10pt; display: none">2
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<P align="left" style="font-size: 10pt"><B>Item&nbsp;9.01. FINANCIAL STATEMENTS AND EXHIBITS</B>


<P align="left" style="font-size: 10pt">(d)&nbsp;<I>Exhibits </I>&#150;


<P>
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<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left">3.1</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>ATMI, Inc. Amended and Restated Bylaws</TD>
</TR>

</TABLE>


<P align="left" style="font-size: 10pt">14.1 &nbsp;ATMI, Inc. Business Code of Conduct


<P align="center" style="font-size: 10pt">3




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

<P align="center" style="font-size: 10pt; display: none">3
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<P align="center" style="font-size: 10pt"><B>SIGNATURES</B>



<P align="left" style="font-size: 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.

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    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">ATMI, INC.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top"></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top"></TD>
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<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Date: December&nbsp;18, 2008
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">By:
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Timothy C. Carlson</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD nowrap colspan="2" align="left" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Timothy C. Carlson</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Executive Vice President, Chief Financial
Officer and Treasurer</TD>
</TR>
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<P align="center" style="font-size: 10pt">&nbsp;

<P align="center" style="font-size: 10pt; display: none">4
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<P align="center" style="font-size: 10pt"><B>EXHIBIT INDEX</B>



<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left">3.1</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>ATMI, Inc. Amended and Restated Bylaws</TD>
</TR>

</TABLE>


<P align="left" style="font-size: 10pt">14.1 &nbsp;ATMI, Inc. Business Code of Conduct


<P align="center" style="font-size: 10pt">5



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

<P align="center" style="font-size: 10pt; display: none">5




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{"company-data": {"conformed-name": "ATMI INC", "cik": "0001041577", "assigned-sic": "2810", "irs-number": "061481060", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-16239", "film-number": "081257080"}, "business-address": {"street1": "7 COMMERCE DRIVE", "city": "DANBURY", "state": "CT", "zip": "06810-4169", "phone": "2037941100"}, "mail-address": {"street1": "7 COMMERCE DRVIE", "city": "DANBURY", "state": "CT", "zip": "06810-4169"}, "former-company": {"former-conformed-name": "ATMI HOLDINGS INC", "date-changed": "19970625"}}
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): December 17, 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 5.03. AMENDMENTS TO ARTICLES OF INCORPORATION OR BYLAWS; CHANGE IN FISCAL YEAR
Amendment of ATMI, Inc. Bylaws
On December 17, 2008, the Board of Directors of ATMI, Inc. (the "Company") approved revisions to Section 2.9 of
the ATMI, Inc. Bylaws and the addition of a new Section 3.15 of the ATMI, Inc. Bylaws in order to: (i) require
disclosure of additional information in connection with submission of a proposal by a stockholder including nomination
of a person for election as a director, including the class and number of shares owned (beneficially and of record) by
the stockholder; a description of any agreements the stockholder has with affiliates or third parties concerning the
stockholder proposal or director nomination; a description of any derivative or short positions, profit interests,
options, hedging transactions, and borrowed or loaned shares the stockholder has with respect to the Company's stock; a
representation that the stockholder is entitled to vote at the meeting and intends to attend the meeting to present the
proposal or director nomination; and whether the stockholder intends to conduct a proxy solicitation; and (ii) require
a stockholder nominating a person for election as a director to include in the advance notice certain biographical
information about each director nominee as well as a questionnaire completed by each director nominee that requires the
nominee to disclose any voting commitments the nominee may have with a third person and commit to comply with the
Company's corporate governance standards if elected.
The foregoing summary description of the Bylaw amendments is qualified in its entirety by reference to the Amended
and Restated Bylaws, a complete copy of which are filed as Exhibit 3.1 hereto, and incorporated herein by reference.
Item 5.05. AMENDMENTS TO THE REGISTRANT'S CODE OF ETHICS, OR WAIVER OF A PROVISION OF THE CODE OF ETHICS
Amendments to ATMI, Inc. Business Code of Conduct
On December 17, 2008, the Board of Directors of ATMI, Inc. approved revisions to the ATMI, Inc. Business Code of
Conduct. The proposed revisions implement non-substantive, clarifying changes to more accurately reflect applicable
personnel and related matters within the Company, including the appointment of a Chief Compliance Officer,
reconstitution of the Compliance Committee and revisions to records management practices, and to accord with best
compliance practices.
The foregoing summary description of the amendments to the ATMI, Inc. Business Code of Conduct is qualified in its
entirety by reference to the amended ATMI, Inc. Business Code of Conduct, a complete copy of which is filed as Exhibit
14.1 hereto, and incorporated herein by reference.
2
Item 9.01. FINANCIAL STATEMENTS AND EXHIBITS
(d)
Exhibits
–
3.1
ATMI, Inc. Amended and Restated Bylaws
14.1  ATMI, Inc. Business Code of Conduct
3
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: December 18, 2008
By:
/s/ Timothy C. Carlson
Timothy C. Carlson
Executive Vice President, Chief Financial
Officer and Treasurer
4
EXHIBIT INDEX
3.1
ATMI, Inc. Amended and Restated Bylaws
14.1  ATMI, Inc. Business Code of Conduct
5