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U.S. SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 3
INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES
Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934,
Section 17(a) of the Public Utility Holding Company Act of 1935 or
Section 30(f) of the Investment Company Act of 1940
(Print or Type Responses)
_______________________________________________________________________________
1. Name and Address of Reporting Person*
BEST CHARLES C.
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(Last) (First) (Middle)
C/O BIOSOURCE INTERNATIONAL, INC.
820 FLYNN ROAD, SUITE A
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(Street)
CAMARILLO CA 93012
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(City) (State) (Zip)
_______________________________________________________________________________
2. Date of Event Requiring Statement (Month/Day/Year)
12-01-99
_______________________________________________________________________________
3. IRS Identification Number of Reporting Person, if an Entity (Voluntary)
_______________________________________________________________________________
4. Issuer Name and Ticker or Trading Symbol
BioSource International, Inc. BIOI
_______________________________________________________________________________
5. Relationship of Reporting Person to Issuer (Check all applicable)
[ ] Director [ ] 10% Owner
[X] Officer (give title below) [ ] Other (specify below)
VP, Chief Financial Officer
_______________________________________________________________________________
6. If Amendment, Date of Original (Month/Day/Year)
_______________________________________________________________________________
7. Individual or Joint/Group Filing (Check Applicable Line)
[X] Form Filed by One Reporting Person
[ ] Form Filed by More than one Reporting Person
_______________________________________________________________________________
<TABLE>
<CAPTION>
TABLE I -- NON-DERIVATIVE SECURITIES BENEFICIALLY OWNED
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2. 3.
Amount of Ownership
Securities Form: 4.
1. Beneficially Direct (D) or Nature of Indirect
Title of Security Owned Indirect (I) Beneficial Ownership
(Instr. 4) (Instr. 4) (Instr. 5) (Instr. 5)
- -----------------------------------------------------------------------------------------------
<S> <C> <C> <C>
- -----------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------
</TABLE>
Reminder: Report on a separate line for each class of securities beneficially
owned directly or indirectly.
SEC 1472 (7-97)
<PAGE>
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TABLE II -- DERIVATIVE SECURITIES BENEFICIALLY OWNED (E.G., PUTS,
CALLS, WARRANTS, OPTIONS, CONVERTIBLE SECURITIES)
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<TABLE>
<CAPTION>
2. 3.
Date Title and Amount
Exercisable and of Securities Underlying 5.
Expiration Date Derivative Security 4. Ownership Form
1. (month/day/year) (Instr. 4) Conversion of Derivative
Title of ---------------- -------------------------- or Exercise Securities 6.
Derivative Date Expira- Amount or Price of Direct (D) or Nature of Indirect
Security Exer- tion Number of Derivative Indirect (I) Beneficial Ownership
(Instr. 4) cisable Date Title Shares Security (Instr. 5) (Instr. 5)
- -----------------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C> <C> <C> <C>
STOCK OPTIONS, * 12/1/2009 COMMON STOCK 30,000 $3.4375 D
COMMON SHARES,
$0.001 PAR VALUE
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- -----------------------------------------------------------------------------------------------------------------------------------
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</TABLE>
Explanation of Responses:
*7,500 options vest on 12/1/00; the remaining options vest pro rata each
month over a subsequent three-year period.
/S/ CHARLES C. BEST April 3, 2000
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**Signature of Reporting Person Date
* If the form is filed by more than one reporting person, SEE
Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal
Criminal Violations. SEE 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed.
If space provided is insufficient, see Instruction 6 for procedure.
Page 2
SEC 1472 (7-97)
