-----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, Wk3dCI1eY8O0r3wdwx2Jhcww9nSulAkKmoPAFFHplfJdaec7lNEf8nEA1Z1jM6LU XDPJM4iM84yxFxkBDFzjeQ== /in/edgar/work/0001079817-00-500018/0001079817-00-500018.txt : 20001102 0001079817-00-500018.hdr.sgml : 20001102 ACCESSION NUMBER: 0001079817-00-500018 CONFORMED SUBMISSION TYPE: SC 13G PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20001031 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: ATMI INC CENTRAL INDEX KEY: 0001041577 STANDARD INDUSTRIAL CLASSIFICATION: [2810 ] IRS NUMBER: 061481060 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G SEC ACT: SEC FILE NUMBER: 005-51731 FILM NUMBER: 749537 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: BROWN INVESTMENT ADVISORY & TRUST CO CENTRAL INDEX KEY: 0001079817 STANDARD INDUSTRIAL CLASSIFICATION: [ ] STATE OF INCORPORATION: MD FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G BUSINESS ADDRESS: STREET 1: 19 SOUTH STREET CITY: BALTIMORE STATE: MD ZIP: 21202 BUSINESS PHONE: 4106376820 MAIL ADDRESS: STREET 1: 19 SOUTH STREET CITY: BALTIMORE STATE: MD ZIP: 21202 SC 13G 1 atmi093000.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.________)* ATMI Incorporated (Name of Issuer) Common Stock (Par Value $0.01) (Title of Class of Securities) 00207R101 (CUSIP Number) Check the following box if a fee is being paid with this statement [ ]. (A fee is not required only if the filing person: (1) has a previous statement on file reporting beneficial ownership of more than five percent of the class of securities described in Item 1; and (2) has filed no amendment subsequent thereto reporting beneficial ownership of five percent or less of such class.)(See Rule 13d-7.) * 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). (Continued on following pages) Page 1 of 6 Pages CUSIP No. 00207R101 Page 2 of 6 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Brown Investment Advisory & Trust Company ("BIATC"), its wholly owned subsidiary, Brown Advisory Incorporated ("BAI"). 52-1811121 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [x] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION Brown Investment Advisory & Trust Company and Brown Advisory Incorporated are Maryland corporations. NUMBER OF 5 SOLE VOTING POWER SHARES BIATC 1819182 shares BAI 0 shares 1819182 shares BENEFICIALLY 6 SHARED VOTING POWER OWNED BY BIATC 0 shares BAI 0 shares 0 shares EACH REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH BIATC 1868366 shares BAI 0 shares 1868366 shares 8 SHARED DISPOSITIVE POWER BIATC 0 shares BAI 0 shares 0 shares CUSIP No. 00207R101 Page 3 of 6 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON BIATC 1868366 shares BAI 0 shares 1868366 shares 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) BIATC 6.29% BAI 0.0% 6.29% 12. TYPE OF REPORTING PERSON* BIATC - BK BAI - IA *SEE INSTRUCTIONS BEFORE FILLING OUT Item 1. (a) NAME OF ISSUER: ATMI Inc. (b) Address of Issuer's Principal Executive Offices: 7 Commerce Drive Danbury Connecticut 06810 Item 2. (a) NAME OF PERSON FILING: Brown Investment Advisory & Trust Company ("BIATC"), its wholly owned subsidiary, Brown Advisory Incorporated ("BAI"). (b) ADDRESS OF PRINCIPAL BUSINESS OFFICE: 19 South Street Baltimore, Maryland 21202 (c) CITIZENSHIP: Brown Investment Advisory & Trust Company and Brown Advisory Incorporated are Maryland corporations. CUSIP No. 00207R101 Page 4 of 6 (d) TITLE OF CLASS OF SECURITIES: Common Stock of ($0.01 par) of ATMI Inc. (e) CUSIP Number: 00207R101 Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b), check whether the person filing is a: For BIATC (b) [x] Bank as defined in section 3(a)(6) of the Act For BAI (e) [x] Investment Adviser registered under section 203 of the Investment Advisers Act of 1940 Item 4. OWNERSHIP: (a) AMOUNT BENEFICIALLY OWNED: As of September 30, 2000 BIATC 1868366 shares BAI 0 shares 1868366 shares (b) PERCENT OF CLASS: BIATC 6.29% BAI 0.0% 6.29% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: BIATC 1819182 shares BAI 0 shares 1819182 shares CUSIP No. 00207R101 Page 5 of 6 (ii) shared power to vote or to direct the vote: BIATC 0 shares BAI 0 shares 0 shares (iii) sole power to dispose or to direct the disposition of: BIATC 1838366 shares BAI 0 shares 1868366 shares (iv) shared power to dispose or to direct the disposition of: BIATC 0 shares BAI 0 shares 0 shares Item 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS. Not applicable Item 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON. Not applicable Item 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY. Not applicable Item 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP. Not applicable Item 9. NOTICE OF DISSOLUTION OF GROUP. Not applicable CUSIP No. 00207R101 Page 6 of 6 Item 10. CERTIFICATION. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purpose or effect. 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. Date: As of September 30,2000 Signature: Brown Investment Advisory & Trust Company By: /S/ James E. Hieber Title: Vice President Signature: Brown Advisory Incorporated By: /S/ James E. Hieber Title: Vice President -----END PRIVACY-ENHANCED MESSAGE-----