UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. 1)
PSYCHEMEDICS CORP.
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(Name of Issuer)
Common Stock
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(Title of Class of Securities)
744375205
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(CUSIP Number)
December 31, 2010
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(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
[X] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[ ] Rule 13d-1(d)
The information required in 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).
CUSIP No. 744375205
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1. NAME OF REPORTING PERSON
I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Cortina Asset Management, LLC
56-2450074
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2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [ ]
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3. SEC USE ONLY
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4. CITIZENSHIP OR PLACE OF ORGANIZATION
Wisconsin
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5. SOLE VOTING POWER: 511,680
NUMBER OF ------------------------------------------------------
SHARES 6. SHARED VOTING POWER: None
BENEFICIALLY
OWNED BY ------------------------------------------------------
EACH 7. SOLE DISPOSITIVE POWER: 594,809
REPORTING
PERSON WITH ------------------------------------------------------
8. SHARED DISPOSITIVE POWER: None
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9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
594,809
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10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
SHARES [ ]
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11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11.41
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12. TYPE OF REPORTING PERSON
IA
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Item 1(a) NAME OF ISSUER
Psychemedics Corp.
(b) ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
125 Nagog Park, Acton, MA 01720
Item 2(a) NAME OF PERSONS FILING
Cortina Asset Management, LLC
(b) ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
825 N Jefferson Street, Suite 400, Milwaukee, Wisconsin 53202
(c) CITIZENSHIP
Cortina is a Wisconsin limited liability company
(d) TITLE OF CLASS OF SECURITIES
Common Stock
(e) CUSIP NUMBER
744375205
Item 3. Type of Person:
(e) [X] Cortina is an Investment Adviser registered under section 203
of the Investment Advisors Act of 1940
Item 4. OWNERSHIP
Ownership (as December 31, 2010):
(a) Amount owned "beneficially" within the meaning of rule 13d-3:
594,809
(b) Percent of class:
11.41 (based on 5,212,536 shares outstanding as of November 12, 2010.)
(c) Number of shares as to which such person has:
(i) Sole power to vote or to direct the vote
511,680
(ii) Shared power to vote or direct the vote
None
(iii) Sole power to dispose or to direct the
disposition of
594,809
(iv) Shared power to dispose or to direct the
disposition of
None
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
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 CLASSIFICAITON 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 acquired and are held in the ordinary course
of business and were not acquired and are not held for the purpose 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.
January 25, 2011
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Date
/s/LORI K. HOCH
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Signature
Lori K. Hoch
Chief Operating Officer and
Chief Compliance Officer
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Name/Title