KEITHLEY INSTRUMENTS INC (KEI) [Rocket]

Ownership

KEITHLEY INSTRUMENTS INC (KEI)

Portfolio as of:

Name	Shares	Change	Value	% Port	% OS	Hist	Date
KEITHLEY JOSEPH P	2,741,724	-96,212	58,809,980			Hist	09/29/2010
WATER ISLAND CAPITAL LLC	734,843	734,843	15,806,000	1.16		Hist	09/30/2010
VANGUARD GROUP INC	392,125	-10,413	8,435,000	0.00		Hist	09/30/2010
DIMENSIONAL FUND ADVISORS LP	385,675	-32,910	8,296,000	0.01		Hist	09/30/2010
BlackRock Institutional Trust Company, N.A.	314,113	-161,235	6,757,000	0.00		Hist	09/30/2010
NWQ INVESTMENT MANAGEMENT COMPANY, LLC	619,784	-502,332	6,687,469			Hist	07/30/2010
ALPINE ASSOCIATES ADVISORS	299,460	299,460	6,442,000	0.22		Hist	09/30/2010
HARVARD MANAGEMENT CO INC	252,477	252,477	5,431,000	0.35		Hist	09/30/2010
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS	208,448	208,448	4,484,000	0.02		Hist	09/30/2010
BARINGS LLC	458,896	-75,304	3,028,000	0.19		Hist	03/31/2010
PRUDENTIAL FINANCIAL INC	115,176	20,700	2,477,000	0.01		Hist	09/30/2010
ROYCE & ASSOCIATES LP	276,600	-118,000	2,442,000	0.01		Hist	06/30/2010
STRS OHIO	107,700	0	2,317,000	0.01		Hist	09/30/2010
SG Americas Securities, LLC	99,876	99,876	2,148,000	0.01		Hist	09/30/2010
TFS CAPITAL LLC	96,196	42,587	2,069,000	0.18		Hist	09/30/2010
SUNTRUST BANKS INC	372,688	-12,000	2,064,000	0.01		Hist	09/30/2009
DEUTSCHE BANK AG\	92,104	66,023	1,980,000	0.00		Hist	09/30/2010
BRIDGEWAY CAPITAL MANAGEMENT, LLC	200,000	200,000	1,766,000	0.07		Hist	06/30/2010
DEPRINCE RACE & ZOLLO INC	261,850	-213,585	1,728,000	0.04		Hist	03/31/2010
NEW YORK STATE TEACHERS RETIREMENT SYSTEM	78,415	-2,500	1,687,000	0.00		Hist	09/30/2010
TIAA CREF INVESTMENT MANAGEMENT LLC	63,253	0	1,361,000	0.00		Hist	09/30/2010
ZACKS INVESTMENT MANAGEMENT	53,075	-3,200	1,142,000	0.08		Hist	09/30/2010
MORGAN STANLEY	52,577	15,542	1,132,000	0.00		Hist	09/30/2010
ClariVest Asset Management LLC	95,217	26,300	841,000	0.10		Hist	06/30/2010
JACOBS LEVY EQUITY MANAGEMENT, INC	91,275	34,167	806,000	0.01		Hist	06/30/2010
SPARK LP /DE	34,600	-15,600	744,000	0.28		Hist	09/30/2010
Great Oaks Capital Management, LLC	28,936	-27,500	622,000	0.14		Hist	09/30/2010
AXA S.A.	26,760	-133,279	575,600	0.00		Hist	09/30/2010
GARDNER LEWIS ASSET MANAGEMENT L P	24,515	24,515	527,000	0.02		Hist	09/30/2010
BlackRock Investment Management, LLC	22,131	1,505	476,000	0.00		Hist	09/30/2010
STIFEL NICOLAUS & CO INC \MO\	21,200	-247,085	456,012	0.02		Hist	09/30/2010
FIRST QUADRANT LLC/CA	17,500	17,500	376,000	0.02		Hist	09/30/2010
QS BATTERYMARCH FINANCIAL MANAGEMENT, INC	14,770	-28,160	318,000	0.00		Hist	11/11/2010
KEYBANK NATIONAL ASSOCIATION/OH	14,512	14,512	312,000	0.00		Hist	09/30/2010
QS Investors, LLC	13,400	13,400	288,000	0.00		Hist	09/30/2010
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