Statement of Changes in Beneficial Ownership (4)

FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * Shima Patrick J	2. Issuer Name and Ticker or Trading Symbol ATMI INC [ ATMI ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                      _____ 10% Owner __ X __ Officer (give title below)      _____ Other (specify below) SVP and CLO
(Last)          (First)          (Middle) 6 COMMERCE DR	3. Date of Earliest Transaction (MM/DD/YYYY) 8/19/2013
(Street) DANBURY, CT US 06810 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _ X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	8/19/2013		A		3000   (1)	A	$0	28298	D

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Non-Qualified Stock Option (Right to Buy)	$24.51	8/19/2013		A		3371		(2)	(2)	Common Stock	3371	$0	3371	D
Total Shareholder Return Performance RSU   (3)	$0	8/19/2013		A		1626   (4)		(5)	(5)	Common Stock	1626	$0	1626	D
Total Shareholder Return Performance RSU   (3)	$0	8/19/2013		A		1626   (6)		(5)	(5)	Common Stock	1626	$0	1626	D

Explanation of Responses:
( 1)	The restricted shares vest 50% on the third anniversary of the date of grant, and 25% on each of the fourth and fifth anniversaries of the date of grant.
( 2)	Non-qualified stock options vest ratably on each anniversary date over the four-year period following the grant date and expire on the tenth anniversary of the grant date.
( 3)	Total Shareholder Return Performance Restricted Stock Units
( 4)	Total Shareholder Return Performance Restricted Stock Units can be earned based upon the relative total shareholder return of ATMI common stock versus the Russell 2000 Index during the performance period from January 1, 2013 to December 31, 2014. Share amount shown represents maximum potential grant pursuant to this award, which represents 175% of the target award. The ultimate grant amount earned can range from zero to the maximum amount depending on relative performance over the applicable period. Vesting takes place, as applicable, after the performance level is determined.
( 5)	Earned amount vests immediately upon determination of performance. Any unearned amount, upon determination of performance, expires immediately.
( 6)	Total Shareholder Return Performance Restricted Stock Units can be earned based upon the relative total shareholder return of ATMI common stock versus the Russell 2000 Index during the performance period from January 1, 2013 to December 31, 2015. Share amount shown represents maximum potential grant pursuant to this award, which represents 175% of the target award. The ultimate grant amount earned can range from zero to the maximum amount depending on relative performance over the applicable period. Vesting takes place, as applicable, after the performance level is determined.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Shima Patrick J 6 COMMERCE DR DANBURY, CT US 06810			SVP and CLO

Signatures
/s/Patrick J. Shima		8/20/2013
** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.