-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, REJdHCs7T6shWQj9Jr60zlBIk+pNTp2P6rrUKc/Vjt4SVXkZHhLAweALszyneBMo +360ZvAukBJ0gkYgmzZqeg== 0001354488-10-000261.txt : 20100211 0001354488-10-000261.hdr.sgml : 20100211 20100211070736 ACCESSION NUMBER: 0001354488-10-000261 CONFORMED SUBMISSION TYPE: SC 13G/A PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20100211 DATE AS OF CHANGE: 20100211 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: ATMI INC CENTRAL INDEX KEY: 0001041577 STANDARD INDUSTRIAL CLASSIFICATION: INDUSTRIAL INORGANIC CHEMICALS [2810] IRS NUMBER: 061481060 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G/A SEC ACT: 1934 Act SEC FILE NUMBER: 005-51731 FILM NUMBER: 10589598 BUSINESS ADDRESS: STREET 1: 7 COMMERCE DRIVE CITY: DANBURY STATE: CT ZIP: 06810-4169 BUSINESS PHONE: 2037941100 MAIL ADDRESS: STREET 1: 7 COMMERCE DRVIE CITY: DANBURY STATE: CT ZIP: 06810-4169 FORMER COMPANY: FORMER CONFORMED NAME: ATMI HOLDINGS INC DATE OF NAME CHANGE: 19970625 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: WESTFIELD CAPITAL MANAGEMENT CO LP CENTRAL INDEX KEY: 0001177719 IRS NUMBER: 800175963 FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G/A BUSINESS ADDRESS: STREET 1: ONE FINANCIAL CENTER STREET 2: 24FL CITY: BOSTON STATE: MA ZIP: 02111 BUSINESS PHONE: 6174287100 MAIL ADDRESS: STREET 1: ONE FINANCIAL CENTER STREET 2: 24FL CITY: BOSTON STATE: MA ZIP: 02111 FORMER COMPANY: FORMER CONFORMED NAME: WESTFIELD CAPITAL MANAGEMENT CO LLC DATE OF NAME CHANGE: 20020717 SC 13G/A 1 westfield_13ga.htm SCHEDULE 13G AMENDMENT 4 WESTFIELD CAPITAL MANAGEMENT CO LP

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549


SCHEDULE 13G


Under the Securities Exchange Act of 1934


(Amendment No.  4)*


ATMI, Inc.

(Name of Issuer)


Common Stock

(Title of Class of Securities)


00207R101

(CUSIP Number)



December 31, 2009

(Date of Event which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule is filed:


ü

 Rule 13d-1(b)

 

 

 

 Rule 13d-1(c)

 

 

 

 Rule 13d-1(d)


*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).


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.



 




CUSIP No. 00207R101                                                   13G                                                   Page 2 of 5 Pages




1

 

 

 

NAME OF REPORTING PERSONS

I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)


Westfield Capital Management Company, LP

#80-0175963

2

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

 

(a)

 

 

 

(b)

 

 

 

 

3

 

 

SEC USE ONLY


4

 

 

CITIZENSHIP OR PLACE OF ORGANIZATION


Massachusetts

 

                              

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 

 

5

SOLE VOTING POWER


805,521

6

SHARED VOTING POWER


0

7

SOLE DISPOSITIVE POWER


1,115,484

8

SHARED DISPOSITIVE POWER


0

9

 

 

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


1,115,484

10

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

 

 

 

 

 

 

 

 

11

 

 

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)


3.55%

12

 

 

TYPE OF REPORTING PERSON


IA








CUSIP No. 00207R101                                                   13G                                                   Page 3 of 5 Pages



Item 1.


(a)

Name of Issuer: ATMI, Inc.

(b)

Address of Issuer’s Principal Executive Offices: 7 Commerce Drive, Danbury, CT 06810


Item 2.


(a)

Name of Person Filing: Westfield Capital Management Company, LP

(b)

Address of Principal Business Office or, if none, Residence: 1 Financial Center, Boston, Massachusetts 02111

(c)

Citizenship: Massachusetts

(d)

Title of Class of Securities: Common Stock

(e)

CUSIP Number: 00207R101


Item 3.

If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:


(a) 

 

 Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);

 

 

 

(b) 

 

 Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);

 

 

 

(c) 

 

 Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);

 

 

 

(d) 

 

 Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8);

 

 

 

(e) 

ü

 An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

 

 

 

(f) 

 

 An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);

 

 

 

(g) 

 

 A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

 

 

 

(h) 

 

 A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

 

 

 

(i) 

 

 A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the

 

 

 Investment Company Act of 1940 (15 U.S.C. 80a-3);

 

 

 

(j) 

 

 Group, in accordance with §240.13d-1(b)(1)(ii)(K).


Item 4.

Ownership.


Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.


(a)

Amount beneficially owned: 1,115,484

(b)

Percent of class: 3.55%

(c)

Number of shares as to which the person has:

(i)

Sole power to vote or to direct the vote: 805,521

(ii)

Shared power to vote or to direct the vote: 0

(iii)

Sole power to dispose or to direct the disposition of: 1,115,484

(iv)

Shared power to dispose or to direct the disposition of: 0

Instruction.  For computations regarding securities which represent a right to acquire an underlying security see §240.13d-3(d)(1).




CUSIP No. 00207R101                                                   13G                                                   Page 4 of 5 Pages



Item 5.

Ownership of Five Percent or Less of a Class.


If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following  þ

Instruction: Dissolution of a group requires a response to this item.


Item 6.

Ownership of More than Five Percent on Behalf of Another Person.

If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than five percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.


The shares of the security listed in this Schedule are owned of record by clients of Westfield Capital Management Company, L.P. (“Westfield Capital”) in its capacity as investment adviser. Westfield Capital’s clients have the right to receive, or the power to direct the receipt of, dividends or proceeds from the sale of the shares. To the best of Westfield Capital’s knowledge, no client has such right or power with respect to more than five percent of this class of security.


Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company

If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach

an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this

schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.


Not Applicable


Item 8.

Identification and Classification of Members of the Group.

If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating

the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c)

or §240.13d-1(d), attach an exhibit stating the identity of each member of the group.


Not Applicable


Item 9.

Notice of Dissolution of Group.

Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings

with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual

capacity. See Item 5.


Not Applicable


Item 10.

Certifications.


(a)

The following certification shall be included if the statement is filed pursuant to §240.13d-1(b):

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.




CUSIP No. 00207R101                                                   13G                                                   Page 5 of 5 Pages



SIGNATURE


After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.



 

 

 

 

 

 

February 11, 2010

 

 

 

Date

 

 

 

 

 

 

 

/s/ Brandi McMahon

 

 

 

Signature

 

 

 

 

 

 

 

Brandi McMahon, Senior Compliance Associate

 

 

 

Name/Title


The original statement shall be signed by each person on whose behalf the statement is filed or his authorized representative. If the statement is signed on behalf of a person by his authorized representative other than an executive officer or general partner of the filing person, evidence of the representative’s authority to sign on behalf of such person shall be filed with the statement, provided, however, that a power of attorney for this purpose which is already on file with the Commission may be incorporated by reference. The name and any title of each person who signs the statement shall be typed or printed beneath his signature.



NOTE: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties for whom copies are to be sent.



Attention: Intentional misstatements or omissions of fact constitute Federal criminal violations (See 18 U.S.C. 1001)






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