UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(AMENDMENT NO. __)
Bone Care International, Inc.
(Name of Issuer)
Common Stock
(Title of Class of Securities)
098072101
(CUSIP Number)
December 31, 2003
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:
[ ] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[X] Rule 13d-1(d)
(1) 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).
13G
CUSIP NO. 098072101
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1 NAME OF REPORTING PERSONS
RICHARD B. MAZESS, Ph.D.
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ]
(b) [X]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
UNITED STATES
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5 SOLE VOTING POWER
1,368,760
NUMBER OF ----------------------------------------------------
SHARES 6 SHARED VOTING POWER
BENEFICIALLY
OWNED BY 1,368,614
EACH ----------------------------------------------------
REPORTING 7 SOLE DISPOSITIVE POWER
PERSON
WITH 1,368,760
----------------------------------------------------
8 SHARED DISPOSITIVE POWER
1,368,614
--------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
2,737,374
--------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
[ ]
--------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
19.1%
--------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*
IN
--------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
CUSIP NO. 098072101
--------------------------------------------------------------------------------
1 NAME OF REPORTING PERSONS
MARILYN MAZESS
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ]
(b) [X]
--------------------------------------------------------------------------------
3 SEC USE ONLY
--------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
UNITED STATES
--------------------------------------------------------------------------------
5 SOLE VOTING POWER
0
NUMBER OF ----------------------------------------------------
SHARES 6 SHARED VOTING POWER
BENEFICIALLY
OWNED BY 1,368,614
EACH ----------------------------------------------------
REPORTING 7 SOLE DISPOSITIVE POWER
PERSON
WITH 0
----------------------------------------------------
8 SHARED DISPOSITIVE POWER
1,368,614
--------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
1,368,614
--------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
[ ]
X
--------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
9.6%
--------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*
IN
--------------------------------------------------------------------------------
ITEM 1(a). NAME OF ISSUER:
BONE CARE INTERNATIONAL
ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
1600 ASPEN COMMONS; MIDDLETON, WI 53562
ITEM 2(a). NAME OF PERSONS FILING:
a. RICHARD B. MAZESS, Ph.D.
b. MARILYN MAZESS
ITEM 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:
(a)-(b) 3534 BLACKHAWK DRIVE; MADISON, WI 53705
ITEM 2(c). CITIZENSHIP:
(a)-(b) UNITED STATES
ITEM 2(d). TITLE OF CLASS OF SECURITIES:
COMMON STOCK, NO PAR VALUE
ITEM 2(e). CUSIP NUMBER:
098072101
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULES 13d-1(b), OR
13d-2(b) OR (c), CHECK WHETHER THE PERSONS FILING ARE:
(a) [ ] Broker or dealer registered under Section 15 of the
Exchange Act;
(b) [ ] Bank as defined in Section 3 (a) (6) of
the Exchange Act;
(c) [ ] Insurance company as defined in Section 3 (a) (19) of
the Exchange Act;
(d) [ ] Investment company registered under Section 8 of the
Investment Company Act;
(e) [ ] An investment advisor in accordance with Rule
13d-1 (b) (1) (ii) (E);
(f) [ ] An employee benefit plan or
endowment fund in accordance with Rule 13d-1 (b) (1)
(ii) (F);
(g) [ ] A parent holding company or control person in
accordance with Rule 13d-1 (b) (1) (ii) (G);
(h) [ ] A savings association as defined in Section 3 (b) of
the Federal Deposit Insurance Act;
(i) [ ] A church plan that is excluded from the definition of
an investment company under Section (c) (14) of the
Investment Company Act;
(j) [ ] Group, in accordance with Rule 13d-1 (b) (1) (ii) (J);
If this statement is filed pursuant to Rule 13d-1(c), check
this box. [ ]
ITEM 4. OWNERSHIP:
(a) RICHARD B. MAZESS, Ph.D.
(a) Amount Beneficially owned: 2,737,374
(b) Percent of Class: 19.1%
(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote: 1,368,760
(ii) Shared power to vote or to direct the vote: 1,368,614
(iii) Sole power to dispose or to direct the disposition of:
1,368,760
(iv) Shared power to dispose or direct the disposition of:
1,368,614
(a) MARILYN MAZESS
(a) Amount Beneficially owned: 1,368,614
(b) Percent of Class: 9.6%
(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote: 0
(ii) Shared power to vote or to direct the vote: 1,368,614
(iii) Sole power to dispose or to direct the disposition of: 0
(iv) Shared power to dispose or direct the disposition of:
1,368,614
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 [_].
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 OR
CONTROL PERSON:
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.
February 13, 2004
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(Date)
/s/ Richard B. Mazess, Ph.D.
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(Signature)
Richard B. Mazess, Ph.D.
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(Name)
February 13, 2004
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(Date)
/s/ Marilyn Mazess
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(Signature)
Marilyn Mazess
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(Name)