China Biologic Products, Inc. (CBPO): Warburg Pincus Sells Shares to Underwriter

Names of
reporting persons.

WP X Biologics LLC

Check the appropriate box if a member
of a group (see instructions).

(a)  ¨        (b)  x

SEC use only

Source of funds (see instructions)

    N/A

Check if disclosure of legal
proceedings is required pursuant to Items 2(d) or 2(e)    ¨

Citizenship or place of
organization

    Delaware

Number of

shares

beneficially

owned by

each

reporting

person

with

Sole voting power

    0

Shared voting power

    3,112,920 (See Item 5)

Sole dispositive power

    0

Shared dispositive power

    3,112,920 (See Item 5)

Aggregate amount beneficially owned by each reporting person

    3,112,920 (See Item 5)

Check if the aggregate amount in Row
(11) excludes certain shares (see instructions)    ¨

Percent of class represented by amount
in Row (11)

    11.7% (See Item 5)

Type of reporting person (see
instructions)

    OO