HALIS JEFFREY S
SC 13D/A, 2000-01-05
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549
                                  SCHEDULE l3D
                    Under the Securities Exchange Act of 1934
                                (Amendment No. 7)

                                   OCTEL CORP.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, par value $0.01 per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    675727101
- --------------------------------------------------------------------------------
                                 (CUSIP Number)
                                                      with a copy to:
                                                      Peter S. Friedman, Esq.
         Jeffrey S. Halis                             Lowenstein Sandler PC
         10 East 50th Street                          65 Livingston Avenue
         New York, New York 10022                     Roseland, New Jersey 07068
         (212) 588-9697                               (973) 597-2570
- --------------------------------------------------------------------------------
                 (Name, Address and Telephone Number of Persons
                Authorized to Receive Notices and Communications)

                                December 22, 1999
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule l3G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Section 240.13d-1(e),  240.13d-1(f) or  240.13d-1(g),  check
the following box. [ ]

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to whom copies are to be sent.

*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
disclosures provided in a prior cover page.

The information required on 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).



<PAGE>


________________________________________________________________________________
1)   Names of  Reporting  Persons/I.R.S.  Identification  Nos. of Above  Persons
     (entities only):

                                Jeffrey S. Halis
________________________________________________________________________________
2)   Check the Appropriate Box if a Member of a Group (See Instructions):
         (a)                                Not
         (b)                             Applicable
________________________________________________________________________________
3)   SEC Use Only
________________________________________________________________________________
4)   Source of Funds (See Instructions):  WC
________________________________________________________________________________
5)   Check if Disclosure  of Legal  Proceedings  is Required  Pursuant to
Items 2(d) or 2(e):
                                            Not Applicable
________________________________________________________________________________

6)   Citizenship or Place of Organization:           United States
________________________________________________________________________________
     Number of                             7) Sole Voting Power:       832,260*
                                            ------------------------------------
     Shares Beneficially                   8) Shared Voting Power:
     Owned by
     Each Reporting                        9) Sole Dispositive Power:  832,260*
     Person With                           -------------------------------------
                                          10) Shared Dispositive Power:
                                          --------------------------------------
________________________________________________________________________________
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:

                  832,260*
________________________________________________________________________________
12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares
                  (See Instructions):

                     Not Applicable
________________________________________________________________________________
13)  Percent of Class Represented by Amount in Row (11):      6.1%*
________________________________________________________________________________
14)  Type of Reporting Person (See Instructions):       IA
________________________________________________________________________________

*    411,300  shares  (3.0%) of Octel Corp.  common  stock,  par value $0.01 per
     share (the "Common Stock"), are owned by Tyndall Partners, L.P., a Delaware
     limited partnership ("Tyndall").  392,500 shares (2.9%) of the Common Stock
     are owned by Tyndall  Institutional  Partners,  L.P.,  a  Delaware  limited
     partnership ("Tyndall  Institutional").  28,460 shares (0.2%) of the Common
     Stock are owned by  Madison  Avenue  Partners,  L.P.,  a  Delaware  limited
     partnership  ("Madison").  0 shares  (0%) of the Common  Stock are owned by
     Halo International,  Ltd., a company organized under the laws of the Cayman
     Islands  ("Halo  International").  Pursuant  to the  Agreement  of  Limited
     Partnership of each of Tyndall,  Tyndall Institutional and Madison, and the
     Investment  Management  Agreement of Halo  International,  Jeffrey S. Halis
     possesses  sole power to vote and direct the  disposition of all the shares
     of Common Stock owned by each of Tyndall,  Tyndall Institutional,  Madison,
     and Halo  International,  respectively.  Jeffrey S. Halis'  interest in the
     Common Stock as set forth herein is limited to the extent of his  pecuniary
     interest,  if any,  in  Tyndall,  Tyndall  Institutional,  Madison and Halo
     International, respectively. See Item 5 below for further information.



<PAGE>

Item 1.   Security and Issuer.

          This statement  relates to the common stock, par value $0.01 per share
(the "Common  Stock"),  of Octel Corp.,  whose principal  executive  offices are
located at Global House, Bailey Lane, Manchester, United Kingdom M90 4AA.

Item 5.   Interest in Securities of the Issuer.

          Based upon the  Quarterly  Report on Form 10-Q of Octel Corp.  for the
quarter ended  September 30, 1999, as of November 3, 1999 there were  13,640,730
shares of Common Stock  outstanding.  As of December 22, 1999, Tyndall Partners,
L.P.  ("Tyndall")  owned  411,300  shares  (3.0%) of the Common  Stock;  Tyndall
Institutional  Partners,  L.P.  ("Tyndall  Institutional")  owned 392,500 shares
(2.9%) of the Common Stock;  Madison Avenue  Partners,  L.P.  ("Madison")  owned
28,460 shares (0.2%) of the Common Stock;  and Halo  International,  Ltd. ("Halo
International")  owned 0 shares  (0%) of the  Common  Stock.  Jeffrey  S.  Halis
possesses sole power to vote and direct the  disposition of all shares of Common
Stock  owned  by  each of  Tyndall,  Tyndall  Institutional,  Madison  and  Halo
International.  Therefore,  for the  purposes of  Regulation  Section 240.13d-3,
Jeffrey S. Halis is deemed to be the  beneficial  owner of 832,260 shares (6.1%)
of the Common Stock.

          The  following  table details the  transactions  during the past sixty
days, each of which was effected in an ordinary  brokerage  transaction,  in the
Common Stock by Mr. Halis or any other person or entity controlled by him or any
person or entity for which he possesses  voting or  investment  control over the
securities thereof:


                            A. Tyndall Partners, L.P.

                                   (Purchases)

                                      NONE

                                     (Sales)

       Date                          Quantity                            Price

 November 1, 1999                     35,823                            $12.19
 November 10, 1999                     7,500                            $10.99
 November 11, 1999                     4,177                            $10.63
 November 11, 1999                     1,823                            $10.63
 November 12, 1999                    18,000                            $10.19
 November 16, 1999                     2,200                            $10.26
 November 17, 1999                    10,000                             $9.97



<PAGE>


                     B. Tyndall Institutional Partners, L.P.

                                   (Purchases)

                                      NONE

                                     (Sales)

       Date                          Quantity                            Price

 November 1, 1999                     31,269                            $12.19
 November 10, 1999                     5,269                            $10.99

                        C. Madison Avenue Partners, L.P.

                                   (Purchases)

                                      NONE

                                     (Sales)

 December 21, 1999                    9,800                             $10.22
 December 22, 1999                    5,000                             $10.22

                           D. Halo International, Ltd.

                                   (Purchases)

                                      NONE

                                     (Sales)

     Date                            Quantity                            Price

  October 26, 1999                    5,000                             $12.69
  November 1, 1999                   59,108                             $12.19
  November 10, 1999                  20,500                             $10.99
  November 16, 1999                   2,200                             $10.26
  November 17, 1999                  10,000                              $9.97
  November 29, 1999                   6,800                              $9.94
  November 30, 1999                  22,092                              $9.94
  December 1, 1999                   12,500                              $9.94



<PAGE>


                                    Signature

          After  reasonable  inquiry  and  to  the  best  of  the  undersigned's
knowledge and belief,  the undersigned hereby certifies that the information set
forth in this statement is true, complete and correct.

                                    January 5, 2000


                                    /s/  Jeffrey   S. Halis
                                    Jeffrey  S. Halis, in  his capacity    as  a
                                    member of  Jeffrey Management, L.L.C.,   the
                                    general  partner  of  Halo Capital Partners,
                                    L.P., the general partner of each of Tyndall
                                    Partners,  L.P.,   Tyndall     Institutional
                                    Partners, L.P., and Madison Avenue Partners,
                                    L.P.,  and as a member of Jemi   Management,
                                    L.L.C.,  the  investment  manager  for  Halo
                                    International, Ltd.


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



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