UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. 1)*
Power-One, Inc.
Common
739308104
December 31, 2006
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).
| CUSIP No. 739308104 | ||
| 1.
Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) |
Security Management Company, LLC 48-1183041 |
|
| 2.
Check the Appropriate Box If a Member of a Group (See Instructions): |
(a) [_] (b) [_] Not Applicable [X] | |
| 3. SEC Use Only | ||
| 4. Citizenship or Place of Organization | A limited liability company organized under the laws of the State of Kansas. | |
| Number of Shares Beneficially Owned by Each Reporting Person With |
5. Sole Voting Power | 6,793,400 |
| 6. Shared Voting Power | -0- | |
| 7. Sole Dispositive Power | 6,793,400 | |
| 8. Shared Dispositive Power | -0- | |
| 9.
Aggregate Amount Beneficially Owned by Each Reporting Person |
6,793,400 | |
| 10. Check
if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) |
Not applicable | |
| 11. Percent of Class Represented by Amount in Row (9) | 7.85% | |
| 12. Type of Reporting Person (See Instructions) | IA | |
ITEM 1
ITEM 2
ITEM 3 If this statement is filed pursuant to §§240.13d-1(b), or 240.13d-2(b) or (c), check whether the person filing is a:
| a. | [ ] | Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o). | |
| b. | [ ] | Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c). | |
| c. | [ ] | Insurance company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c). | |
| d. | [ ] | Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8). | |
| e. | [X] | An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E) | |
| f. | [ ] | An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F). | |
| g. | [ ] | A parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G). | |
| h. | [ ] | A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813). | |
| i. | [ ] | A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3). | |
| j. | [ ] | Group, in accordance with §240.13d-1(b)(1)(ii)(J). |
ITEM 4 Ownership.
Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.
**This report is being filed on behalf of Security Management Company, LLC ("SMC"), a Kansas limited liability company, and/or certain investment advisory clients relating to their collective beneficial ownership of shares of common stock of the Issuer. SMC is a registered investment adviser under Section 203 of the Investment Advisers Act of 1940. As a result of its role as investment adviser, SMC may be deemed to be the beneficial owner of the securities of the Issuer for purposes of §13(d) and 13(g) of the Securities Exchange Act of 1934. SMC has the sole power to dispose of the shares.
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.
Certain advisory clients of Security Management Company, LLC have the right to receive or the power to direct the receipt of dividends from or the profits from the sale of such securities.
ITEM 7 Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company.
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 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.
| Dated: February 12, 2007 MICHAEL G. ODLUM Michael G. Odlum President |