ATMI,
Inc.
Item
1.
(b)
Address
of Issuer’s Principal Executive Offices
7
Commerce Drive
Danbury,
CT 06810
Item
2.
(a)
Name of Person
Filing
This
Schedule 13G is being filed on behalf of the following persons (the “Reporting
Persons”)*:
(i) Ziff
Asset Management, L.P. (“ZAM”);
(ii) PBK
Holdings, Inc. (“PBK”);
(iii) Philip
B. Korsant; and
(iv) ZBI
Equities, L.L.C. (“ZBI”).
* Attached
as Exhibit A is a copy of an agreement among the Reporting Persons that this
Schedule 13G is being filed on behalf of each of them.
Item
2. (b) Address
of Principal Business Office or, if None, Residence
Ziff
Asset Management, L.P.
283
Greenwich Avenue
Greenwich,
CT 06830
PBK
Holdings, Inc.
283
Greenwich Avenue
Greenwich,
CT 06830
Philip
B.
Korsant
283
Greenwich Avenue
Greenwich,
CT 06830
ZBI
Equities, L.L.C.
283
Greenwich Avenue
Greenwich,
CT 06830
Item
2. (c)
Citizenship
See
Item
4 of the attached cover pages.
Item
2. (d) Title
of Class of Securities
Common
Stock, $.01 par value (the “Common Stock”)
Item
2. (e)
CUSIP Number
00207R101
Item
3.
Not
applicable as this Schedule 13G is filed pursuant to Rule 13d-1(c).
Item
4. Ownership
(a)
Amount
beneficially
owned:
See Item 9 of the attached cover pages.
(b)
Percent
of class:
See
Item 11 of the attached cover
pages.
(c)
Number of shares as to which such person has:
(i)
Sole power to vote or to direct the vote:
See
Item 5 of the attached cover
pages.
(ii) Shared
power to vote or to direct the vote:
See
Item 6 of the attached cover
pages.
(iii) Sole
power to dispose or to direct the disposition:
See
Item 7 of the attached cover
pages.
(iv) Shared
power to dispose or to direct the disposition:
See
Item 8 of the attached cover
pages.
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
ZAM
is
the owner of record of the shares of Common Stock reported
herein. Each of PBK, Philip B. Korsant, and ZBI may be deemed to
beneficially own the Common Stock reported herein as a result of the direct
or
indirect power to vote or dispose of such stock.
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.
Item
10. Certification
By
signing below I certify that, to the best of my knowledge and belief, the
securities referred to above 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.
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.
Dated: February
13, 2008