UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
SCHEDULE 13G
(Under the Securities Exchange Act of 1934)
(Amendment No. 3)*
KEITHLEY INSTRUMENTS, INC.
------------------------------------------------------
(Name of Issuer)
COMMON STOCK
---------------------------------
(Title of Class of Securities)
487584104
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(Cusip Number)
December 31, 2009
_______________________________
(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)Babson Capital Management LLC
[X] Rule 13d-1 (c)Cobbs Wharf Master Fund, L.P.
[ ] Rule 13d-1 (d)
*The remainder of this cover page shall be filled out for a
reporting person's initial filing of 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.)
[Continued on the following page(s)]
Page 1 of 8 Pages
CUSIP No 487584104 Page 2 of 8 Pages
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1. Name of reporting person
S.S. or I.R.S. identification no. of above person
Babson Capital Management LLC
51-0504477
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2. Check the appropriate box if a member of a group
(a)( )
(b)( X )
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3. SEC use only
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4. Citizenship or place of organization
Delaware
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5. Sole Voting Power
534,200
Number of -----------------------------
shares 6. Shared Voting Power
beneficially
owned by 0
each -----------------------------
Reporting 7. Sole Dispositive Power
person
with 534,200
-----------------------------
8. Shared Dispositive Power
0
---------------------------------------------------------------
9. Aggregate amount beneficially owned by each reporting person
534,200
---------------------------------------------------------------
10. Check if the aggregate amount in row (9) excludes certain shares*
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11. Percent of class represented by amount in row 9
3.39%
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12. Type of Reporting person
IA
CUSIP No 487584104 Page 3 of 8 Pages
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1. Name of reporting person
S.S. or I.R.S. identification no. of above person
Cobbs Wharf Master Fund, L.P.
----------------------------------------------------------------
2. Check the appropriate box if a member of a group
(a)( )
(b)( X )
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3. SEC use only
----------------------------------------------------------------
4. Citizenship or place of organization
Delaware
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5. Sole Voting Power
0
Number of -----------------------------
shares 6. Shared Voting Power
beneficially
owned by 0
each -----------------------------
Reporting 7. Sole Dispositive Power
person
with 0
-----------------------------
8. Shared Dispositive Power
0
---------------------------------------------------------------
9. Aggregate amount beneficially owned by each reporting person
0
---------------------------------------------------------------
10. Check if the aggregate amount in row (9) excludes certain shares*
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11. Percent of class represented by amount in row 9
0%
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12. Type of Reporting person
PN
CUSIP No 487584104 Page 4 of 8 Pages
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SCHEDULE 13G
ITEM 1(A): NAME OF ISSUER:
KEITHLEY INSTRUMENTS INC.
1(B): ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
28775 Aurora Road
Solon, Ohio 44139
ITEM 2(A): NAME OF PERSON FILING:
(i) Babson Capital Management LLC (Babson) as investment adviser.
(ii) Cobbs Wharf Master Fund, L.P. (Cobbs Wharf)
ITEM 2(B): ADDRESS OF PRINCIPAL BUSINESS OFFICE:
Babson Capital Management LLC
470 Atlantic Avenue
Boston, MA 02210-2208
Cobbs Wharf Master Fund, L.P.
470 Atlantic Avenue
Boston, MA 02210-2208
ITEM 2(C): CITIZENSHIP:
See Cover Page
ITEM 2(D): TITLE OF CLASS OF SECURITIES:
See Cover Page
ITEM 2(E): CUSIP NUMBER:
See Cover Page
ITEM 3: TYPE OF REPORTING PERSON:
If this statement is filed pursuant to Sections 240.13d-1 (b)
or 240.13d-2 (b) or (c), check whether the filing person is a:
(e) [x] An investment adviser in accordance with
Section 240.13d-1 (b) (1) (ii) (E)
ITEM 4: OWNERSHIP:
(a)AMOUNT BENEFICIALLY OWNED: Babson Capital Management LLC
(Babson Capital) in its capacity as investment adviser, may be deemed
the beneficial owner of 534,200 shares of common stock of the Issuer
which are owned by investment advisory client(s). This constitutes
3.39% of the shares outstanding based on 15,749,900 shares of common
stock outstanding as reported in the Issuer's Form 8-K Report for the
period ending December 31, 2009.
Cobbs Wharf Master Fund, L.P. no longer beneficially owns shares.
Cobbs Wharf Master Fund, L.P., a Cayman Islands limited partnership
to which Babson Capital served as investment adviser, was liquidated
and has ceased operations and the shares of Keithley Instruments, Inc.
previously reported in the Schedule 13G amendment(2), were sold as
part of the Fund's liquidation.
CUSIP No 487584104 Page 5 of 8 Pages
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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 per cent of the class of securities check
the following: [x]
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:
N/A
ITEM 8: IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:
N/A
ITEM 9: NOTICE OF DISSOLUTION OF GROUP:
N/A
ITEM 10: CERTIFICATION:
BABSON CAPITAL MANAGEMENT LLC 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 such 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.
Date: February 12, 2010
Babson Capital Management LLC
Signature: // Melissa Lagrant //
Name/Title: Melissa Lagrant
Managing Director
CUSIP No 487584104 Page 6 of 8 Pages
______________________________________________________________
COBBS WHARF MASTER FUND, L.P.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 such 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.
Date: February 12, 2010
Cobbs Wharf Master Fund, L.P.
By: Cobbs Wharf Management, LLC
Its General Partner
By: // Melissa Lagrant //
Name: Melissa Lagrant
Title: Managing Director
CUSIP No 487584104 Page 7 of 8 Pages
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JOINT FILING AGREEMENT
This will confirm the agreement by and among all the undersigned
that the amended Schedule 13G filed on or about this date and any
future amendments thereto with respect to the beneficial ownership
by the undersigned of common shares of Keithly Instruments, Inc.
is being filed on behalf of each of the undersigned in accordance
with Rule 13d-1(k)(1). This agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all
of which together shall constitute one and the same instrument.
SIGNATURE:
Date: February 12, 2010
Babson Capital Management LLC
_____________________________
By: // Melissa Lagrant //
Name: Melissa Lagrant
Title: Managing Director
Date: February 12, 2010
Cobbs Wharf Master Fund, L.P.
_____________________________
By: Cobbs Wharf Management, LLC
Its General Partner
By: // Melissa Lagrant //
Name: Melissa Lagrant
Title: Managing Director
CUSIP No 487584104 Page 8 of 8 Pages
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February 12, 2010
Securities and Exchange Commission
Operations Center
Attn: Stop 0-7
6432 General Green Way
Alexandria, VA 22312-2413
Re: SCHEDULE 13G RELATING TO COMMON STOCK OF KEITHLEY INSTRUMENTS
FOR THE YEAR ENDING DECEMBER 31, 2009
Dear Sir or Madam:
Babson Capital Management LLC and Cobbs Wharf Master Fund, L.P.
are filing today an amendment to the previously amended
Schedule 13G through the EDGAR system as required by Section
240.13d-1(b) to reflect a change in reporting persons and a change in
beneficial ownership of the outstanding stock of the above-mentioned
issuer.
Please note that the shares as to which this Schedule is filed are
owned by various investment advisory clients of Babson Capital,
which may be deemed a beneficial owner of the shares only by virtue of
the direct or indirect investment discretion it possesses pursuant to
the provisions of investment advisory agreements with such clients.
A copy of the Schedule 13G is being sent to the issuer as required by
Rule 13d-7.
Comments or questions concerning the above may be directed to the
undersigned at (617) 761-3731.
Sincerely,
// Melissa Lagrant //
Melissa Lagrant
Managing Director