UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. ____)*
American Superconductor Corporation
(Name of Issuer)
Common Stock
(Title of Class of Securities)
030111108
(CUSIP Number)
December 31, 2006
(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 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 the disclosures provided in a prior cover page.
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).
SCHEDULE 13G
CUSIP No. 030111108
--------------------------------------------------------------------------------
1. Names of Reporting Persons. I.R.S. Identification Nos. of above persons
(entities only).
AMVESCAP PLC
PowerShares Capital Managements LLC
Stein Roe Investment Counsel, Inc.
--------------------------------------------------------------------------------
2. Check the Appropriate Box if a Member of a Group (see Instructions)
(a) [ ]
(b) [ ]
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. Citizenship or Place of Organization
AMVESCAP PLC: England
PowerShares Capital Management LLC: United States
Stein Roe Investment Counsel, Inc. - United States
--------------------------------------------------------------------------------
5. Sole Voting Power 2,108,837: Such shares are held by
the following entities in the respective amounts
listed:
PowerShares Capital Management LLC 2,107,337
Stein Roe Investment Counsel, Inc. 1,500
-----------------------------------------------------------
6. Shared Voting Power
Number of Shares
Beneficially Owned -0-
by Each Reporting -----------------------------------------------------------
Person With 7. Sole Dispositive Power 2,108,837: Such shares are held
by the following entities in the respective amounts
listed:
PowerShares Capital Management LLC 2,107,337
Stein Roe Investment Counsel, Inc. 1,500
-----------------------------------------------------------
8. Shared Dispositive Power
-0-
--------------------------------------------------------------------------------
9. Aggregate Amount Beneficially Owned by Each Reporting Person
2,108,837
--------------------------------------------------------------------------------
10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
Instructions)
N/A
--------------------------------------------------------------------------------
11. Percent of Class Represented by Amount in Row (9)
6.31%
--------------------------------------------------------------------------------
12. Type of Reporting Person (See Instructions)
IA, HC. See Items 2 and 3 of this statement.
--------------------------------------------------------------------------------
SCHEDULE 13G
Item 1(a) Name of Issuer:
American Superconductor Corporation
Item 1(b) Address of Issuer's Principal Executive Offices:
Two Technology Drive
Westborough, MA 01581
Item 2(a) Name of Person Filing:
AMVESCAP PLC
In accordance with Securities and Exchange Commission Release No.
34-39538 (January 12, 1998), this statement on Schedule 13G or
amendment thereto is being filed by AMVESCAP PLC ("AMVESCAP"), a U.K.
entity, on behalf of itself and its subsidiaries listed in Item 4 of
the cover of this statement. AMVESCAP through such subsidiaries
provides investment management services to institutional and
individual investors worldwide.
Executive officers and directors of AMVESCAP or its subsidiaries may
beneficially own shares of the securities of the issuer to which this
statement relates (the "Shares"), and such Shares are not reported in
this statement. AMVESCAP and its subsidiaries disclaim beneficial
ownership of Shares beneficially owned by any of their executive
officers and directors. Each of AMVESCAP's direct and indirect
subsidiaries also disclaim beneficial ownership of Shares beneficially
owned by AMVESCAP and any other subsidiary.
Item 2(b) Address of Principal Business Office:
30 Finsbury Square
London EC2A 1AG
England
Item 2(c) Citizenship:
See the response to Item 2(a) of this statement.
Item 2(d) Title of Class of Securities:
Common Stock, $.01 par value per share
Item 2(e) CUSIP Number:
030111108
Item 3 If this statement is filed pursuant to ss240.13d-1(b) or 240.13d-2(b)
or (c), check whether the person filing is a:
(e) [X] An investment adviser in accordance with section
240.13d-1(b)(1)(ii)(E)
(g) [X] A parent holding company or control person in accordance
with section 240.13d-1(b)(1)(ii)(G)
As noted in Item 2 above, AMVESCAP is making this filing on behalf of
its subsidiaries listed herein. Each of these entities is either an
investment adviser registered with the United States Securities and
Exchange Commission under Section 203 of the Investment Advisers Act
of 1940, as amended, or under similar laws of other jurisdictions.
AMVESCAP is a holding company.
Item 4 Ownership:
Please see responses to Items 5-8 on the cover of this statement,
which are incorporated herein by reference.
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:
N/A
Item 7 Identification and Classification of the Subsidiary Which Acquired the
Security Being reported on By the Parent Holding Company:
Please see Item 3 of this statement, which is incorporated herein by
reference.
Item 8 Identification and Classification of Members of the Group:
N/A
Item 9 Notice of Dissolution of a Group:
N/A
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 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.
02/14/2007
Date
AMVESCAP PLC
By: /s/ Lisa Brinkley
------------------------------------
Lisa Brinkley
Chief Compliance Officer
Exhibit Index
Exhibit A Joint Filing Agreement