Investment Presentation 
August 2009
Exhibit 99.1


2
Safe Harbor Statement Under the
Private Securities Litigation Reform Act of 1995
Except
for
the
historical
information
and
discussions
contained
herein,
statements
contained
herein
may
constitute
“forward-looking
statements”
within
the
meaning
of
the
Private
Securities
Litigation
Reform
Act
of
1995.
These
statements
involve
a
number
of
risks,
uncertainties
and
other
factors
that
could
cause
actual
results
to
differ
materially,
as
discussed
in
the
company’s
filings
with
the
U.S.
Securities
and
Exchange
Commission,
including
but
not
limited
to
the
following:
Gallagher’s
commission
revenues
are
highly
dependent
on
premiums
charged
by
insurers,
which
are
subject
to
fluctuation;
lower
interest
rates
reduce
Gallagher’s
income
earned
on
invested
funds;
the
alternative
insurance
market
continues
to
grow
which
could
unfavorably
impact
commission
and
favorably
impact
fee
revenue,
though
not
necessarily
to
the
same
extent;
Gallagher’s
revenues
vary
significantly
from
period
to
period
as
a
result
of
the
timing
of
policy
inception
dates
and
the
net
effect
of
new
and
lost
business
production;
the
insurance
brokerage
industry
is
subject
to
uncertainty
due
to
investigations
into
its
business
practices
by
various
governmental
authorities
and
related
private
litigation;
the
general
level
of
economic
activity
can
have
a
substantial
impact
on
Gallagher’s
renewal
business;
Gallagher’s
operating
results,
returns
on
investments
and
financial
position
may
be
adversely
impacted
by
exposure
to
various
market
risks
such
as
interest
rate,
equity
pricing,
foreign
exchange
rates
and
the
competitive
environment;
disruptions
in
the
credit
and
financial
markets
could
limit
access
to
capital
and
credit
and
make
it
more
difficult
for
Gallagher
to
obtain
financing
for
its
operations
or
investments
or
increase
its
cost
of
obtaining
financing;
liquidity
or
capital
problems
at
one
or
more
of
the
lenders
under
Gallagher’s
revolving
credit
facility
could
reduce
or
eliminate
the
amount
available
for
Gallagher
to
draw
under
such
facility;
changes
in
the
pension
regulatory
environment
and
investment
losses
in
its
pension
plan
could
require
Gallagher
to
make
significant
contributions
to
its
defined
benefit
pension
plan
and
increase
its
pension
expense
in
future
periods;
and
Gallagher’s
effective
income
tax
rate
may
be
subject
to
increase
as
a
result
of
changes
in
income
tax
laws,
unfavorable
interpretations
of
past,
current
or
future
laws
or
developments
resulting
in
the
loss
or
unavailability
of
historically
claimed
IRC
Section
29-related
Syn/Coal
Credits.
Gallagher’s
ability
to
grow
has
been
enhanced
through
acquisitions,
which
may
or
may
not
be
available
on
acceptable
terms
in
the
future
and
which,
if
consummated,
may
or
may
not
be
advantageous
to
Gallagher.
Accordingly,
actual
results
may
differ
materially
from
those
set
forth
in
the
forward-looking
statements.
For
a
further
discussion
of
certain
of
the
matters
described
above
see
Item
1A,
“Risk
Factors”
in
Gallagher’s
Annual
Report
on
Form
10K
for
the
year
ended
December
31,
2008
and
in
Gallagher’s
Quarterly
Report
on
Form
10Q
for
the
quarter
ended
June
30,
2009.


3
Certain Non-GAAP Financial Measures
This
presentation
includes
certain
information
that
may
be
considered
“non-GAAP
financial
measures”
within
the meaning of SEC regulations because it is derived from Gallagher’s consolidated financial information but
is
not
required
to
be
presented
in
financial
statements
that
are
prepared
in
conformity
with
U.S.
generally
accepted accounting principles (GAAP).  Consistent with SEC regulations, a description of such information is
provided below and a reconciliation of certain of such items to GAAP is provided on our web-site at
www.ajg.com.
Pretax earnings from continuing operations for 2006 and 2005 were adjusted in this presentation to add back
charges related to litigation and contingent commission matters and claims handling obligations and to
eliminate the impact of medical and pension plan changes.  Charges in 2006 related to retail contingent
commission
related
matters
and
medical
plan
changes
totaled
$9.0
million
(or
$5.4
million
after
tax)
and
$7.5
million (or $4.5 million after tax), respectively.  Charges in 2005 related to retail contingent commission matters
and claims handling obligations totaled $73.6 million (or $44.2 million after tax) and $5.2 million (or $3.6 million
after tax), respectively.  In addition, Gallagher recognized a pension curtailment gain of $10.0 million (or $6.0
million after tax) in 2005.  There were no such charges or gains
in 2001 to 2004.  These adjustments, which
Gallagher believes are for non-recurring items, were made to GAAP earnings from continuing operations in
2006 and 2005 in order to calculate earnings from continuing operations before litigation and contingent
commission related matters, claims handling obligations and medical and pension plan changes.  In addition,
total revenues and pretax earnings from continuing operations exclude retail contingent commissions and are
on an as originally reported basis for all periods presented in this presentation.
Gallagher
believes
the
“non-GAAP
financial
measures”
included
in
this
presentation
provide
meaningful
additional information, which may be helpful to investors in assessing certain aspects of Gallagher's operating
performance and financial condition that may not be otherwise apparent from GAAP.  Industry peers provide
similar supplemental information, although they may not use the same or comparable terminology and may
not make identical adjustments.  This non-GAAP information should be used in addition to, but not as a
substitute for, the GAAP information.


4
Arthur J. Gallagher & Co.
Among the world’s top 5 insurance brokers *
Retail & Wholesale –
89% US; 11% International
Largest MGA manager*
Fastest growing Lloyd’s wholesaler (5 yrs)
Predominate focus on middle market space
Largest P&C third party administrator*
Adjusting WC, liability & property claims/BPO
84% US; 16% International
2008 Business Insurance
Readers Choice Award
Simple business model:  we sell insurance
and adjust claims
No underwriting risk
*According to Business Insurance


5
Excellent Start -
First Half 2009*
$144
$175
$50
$100
$150
$200
$250
1H08
1H09
EBITDA up 22%
$805
$855
$500
$600
$700
$800
$900
$1,000
1H 08
1H 09
Revenues up 6%
*From continuing operations
See important disclosures regarding non-GAAP measures
(in millions, except per share data)
$0.62
$0.73
$0.10
$0.30
$0.50
$0.70
$0.90
$1.10
1H 08
1H 09
EPS up 18%


6
Solid Growth in the First Half
Despite:
Soft P/C pricing environment
No investment yield
Sliding economy
By delivering through:
Focused cost savings initiatives
Solid M&A program
Controlling workforce
Acceptable organic growth (given conditions)
Prudent balance sheet


7
Brokerage Segment
Retail  80%
Mostly U.S. and
Canada
Wholesale 20%
Mostly U.S. and U.K.
See important disclosures regarding Non-GAAP measures on Page 3
2008 EBITDA -
$223 m
2008 Revenues -
$1.2 b


8
Brokerage Segment Results
First Half 2009
$113
$146
$50
$100
$150
$200
1H 08
1H 09
EBITDA up 29%
$570
$630
$400
$500
$600
$700
$800
1H 08
1H 09
Revenues up 11%
See important disclosures regarding non-GAAP measures
(in millions)


9
Growth
Domestic
International
Cost containment
Stay in sweet spot
Middle to upper commercial market
Brokerage Segment Focus


10
Growth -
Domestic
Organic
Hiring new producers wanting:
Access to our network, expertise and niches
Infrastructure support
Growing our own producers thru:
Two-year internship program
Career Launch program
Acquisitions
18,000 retail and wholesale brokerages and agencies* in
the U.S. (P&C and Benefits)
Many owned by baby boomers that need an exit strategy
yet still want to be in the business
Smaller number of consolidators
*According to Hales & Co, Inc.


11
ID
MT
WA
CA
UT
NV
AZ
NM
TX
OK
KS
NE
MN
WI
MO
AR
LA
TN
IL
WV
PA
NY
NH
ME
MA
CT
NJ
DE
MD
IA
CO
WY
SD
ND
OR
OH
MI
KY
MS
AL
GA
FL
SC
NC
VA
VT
RI
IN
AK
HI
Current Gallagher U.S. Locations


12
Larger cities where we aren’t located
ID
68
MT
59
WA
282
CA
1,777
UT
122
NV
103
AZ
237
NM
77
TX
1,082
OK
181
KS
185
NE
137
MN
300
WI
315
MO
320
AR
109
LA
232
TN
340
IL
711
WV
78
PA
904
NY
1,425
NH
121
ME
112
MA
642
CT
331
NJ
699
DE
53
MD
301
IA
213
CO
221
WY
18
SD
47
ND
45
OR
181
OH
641
MI
524
KY
189
MS
126
AL
199
GA
467
FL
1,079
SC
189
NC
444
VA
317
VT
56
RI
IN
324
AK
36
HI
47
DC
23
Puerto Rico
53
Virgin Islands
2
Source
for
Acquisition
Targets:
Hales
&
Co.,
Inc.
and
D&B


13
Growth By Acquisition
$23
$38
$83
$150
$81
$10
$16
$16
$16
$0
$0
$50
$100
$150
Retail
Wholesale
Annualized Revenue Acquired (in millions)
2005
2006
2007
2008
1H 09
-
2008 was a record year for acquisitions
-
1   half 2009 –
Liberty/Wausau deal
-
2  
half 2009 –
expect slower pace
st
nd


14
Growth by Acquisition
Approx. 230 deals since 1985
Typical deal:
$2 to $10 million in revenues
2 to 5 producers/staff of 10 to 20
EBITDA margins between 25% -
30%
2008 –
paid 6.3x EBITDA
2009 June YTD –
paid 5.8x EBITDA
Must fit into our sales culture!
See important disclosures regarding Non-GAAP measures on Page 3.
EBITDA multiples are based on the initial recorded purchase price, which in 2009 includes the estimated fair value of earnout payable.
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
2006
2007
2008
1H 2009
Median EBITDA Multiples


15
Unique Deal
Liberty/Wausau –
closed 2/27/09
Annualized revenues of approx. $70m
Approx 125 new producers and 140 support/mgmt
staff
26 states predominately in Midwest & East/Southeast
Approx
18
new
locations
with
“tuck
ins”
into
42
existing
offices
New Gallagher producers –
no longer captive agents
Access to full suite of new products, markets & niche expertise
Access to new clients
Break even or better in 2009 
Approximately $25 -
$30m EBITDA in 2010


16
Organic
Substantial London operations
Hire experienced sales teams
Opportunistic acquisitions/minority interests
Gallagher Optimus Network
Correspondent brokers and agents in over 100
countries
Stages of partnership to investment
Growth -
International


17
Gallagher Optimus Network


18
Retail Contingent Commission Change
July 2009 amended agreement
Continue to be fully transparent to clients on
all compensation
Can accept across all lines of brokerage
business
Effective 10/1/09
Anticipate approx $10m additional EBITDA on
annualized basis by 2011


19
Risk Management Segment 
2008 Revenues -
$465m
Workers
Compensation  69%
Liability 27%
Property 4%
Domestic 84%
International
16%
2008 EBITDA -
$58m
See important disclosures regarding Non-GAAP measures on Page 3


20
Risk Management Segment Results
First Half 2009
See important disclosures regarding non-GAAP measures
(in millions)
Excludes the impact of foreign exchange.  As reported 1H 08 revenues were $231m and 1H 08 EBITDA was $33m.
$223
$226
$50
$100
$150
$200
$250
$300
$350
1H 08
1H 09
Revenues up 1%
$30
$34
$0
$20
$40
$60
$80
1H 08
1H 09
EBITDA up 13%


21
Growth
Domestic
International
Client service
High quality standards
Technology
Cost containment
Risk Management Segment -
Focus


22
RM Growth -
Domestic
All organic
Over 86% non-Gallagher clients
Targeting
Mainly Fortune 1000
Standard platform enables profitable service to smaller accounts
Differentiation
Network
focused
or
dedicated
-
flexibility
Client intimacy
Quality standards
Proprietary technology
National workers compensation capability


23
Fastest growing
Revenues
-
3
year
CAGR
of
24%
In Australia, Canada, UK & New Zealand
Largely public entity but leveraging US
expertise to penetrate commercial clients
Global technology capabilities
Standard claims process
RM Growth -
International


24
AK
HI
AUSTRALIA
NEW ZELAND
SCOTLAND
ENGLAND
ID
MT
WA
CA
UT
NV
AZ
N
M
TX
OK
KS
NE
MN
WI
M
O
AR
LA
TN
IL
W
V
PA
NY
NH
ME
MA
CT
NJ
D
E
M
D
IA
CO
W
Y
SD
ND
OR
OH
MI
KY
MS
AL
GA
FL
SC
NC
VA
VT
RI
IN
ONTARIO
Risk Management Locations


25
IN SUMMARY


26
Growing Revenues*
$500
$800
$1,100
$1,400
$1,700
$2,000
11% CAGR
2004
2005
2006
2007
2008
$1,045
$1,288
$1,408
$1,558
$1,653
*Brokerage
&
Risk
Management
Revenues
from
continuing
operations
excluding
retail
contingent
commissions
prior
to
2006
See important disclosures regarding Non-GAAP measures on Page 3
$1,175
2003
1H 08
1H 09
$802
$855
7%


27
Improving Operations
18%
21%
16%
17%
18%
19%
20%
21%
22%
1H 08
1H 09
EBITDA Margins* - First Half 2009
See important disclosures regarding Non-GAAP measures on Page 3.
+ 300 bps
*Brokerage & Risk Management


28
Generating Cash
* See important disclosures regarding Non-GAAP measures on Page 3.
(In millions)
24%
$0
$50
$100
$150
$200
$250
$300
$350
2003
2004
2005
2006
2007
2008
1H 08
1H 09
Operating Cash Flows
EBITDA


29
Returning Cash to Shareholders
2007 excludes share repurchases of $262M financed by debt.
See important disclosures regarding Non-GAAP measures on Page 3
39%
45%
50%
50%
56%
59%
30%
1%
15%
0%
1%
51%
30%
40%
50%
60%
70%
80%
90%
100%
2003
2004
2005
2006
2007
2008
Dividends / operating cash flows
Repurchases / operating cash flows
Average as % of Cash Flows


30
Paying Dividends
1986
2009
$1.28*
Year
$0.00
$0.20
$0.40
$0.60
$0.80
$1.00
$1.20
$1.40
*Indicated –
On July 23, 2009, Gallagher’s Board of Directors declared a $.32 per share 3Q 09 quarterly dividend
Dividends Per Share


31
Dividend Yield
1986
2009
$1.28*
Year
$0.00
$0.20
$0.40
$0.60
$0.80
$1.00
$1.20
$1.40
*Indicated –
On July 23, 2009, Gallagher’s Board of Directors declared a $.32 per share 3Q 09 quarterly dividend
As of 8/31/09
Yield is 5.4%
Dividends Per Share


32
Prudent Balance Sheet
Flexibility remains -
$243M available line of credit capacity at 6/30/09
See important disclosures regarding Non-GAAP measures on Page 3
Global
Insurance
Broker Avg
S&P 1000
(millions)
2008
2008
2008
Total Debt
$532
Stockholders' equity
$739
Debt to Total Capital
(Debt/(Debt + Equity))
42%
42%
46%
Debt to EBITDA*
2.0
2.2
3.5
Including Unfunded Pension Liability
Debt to Total Capital
(Debt/(Debt + Equity))
44%
48%
53%
Debt to EBITDA*
2.2
2.9
3.6
*Global Insurance Broker's EBITDA adjusted for restructuring charges & unusual items
Gallagher
Source for S&P 1000 data:  Worldscope
and
First Call via Thomson Reuters.  Pension data using most currently available information and may not
reflect YE 2008 amounts in all cases.


33
In Summary
Top priority –
servicing our clients
Helping them navigate troubled economy
Continuing to increase quality service levels
Expanding capabilities and options


34
•Questions & Answers


35
Exhibit 1
Short-cut To Understand Cash Flows
(See GAAP cash flows in Statement of Cash Flows*)
See important disclosures regarding Non-GAAP measures on Page 3
$ millions
2005
2006
2007
2008
1H 2008
1H 2009
Brokerage & Risk Management EBITDA from Continuing Operations
(adjusted for unusual items)
266
273
304
291
145
180
Stock compensation expense
16
25
19
18
10
7
Capital Expenditures
(23)
(33)
(41)
(32)
(16)
(14)
Interest expense on corporate debt & corporate overhead expenses
(6)
(6)
(22)
(35)
(17)
(17)
Taxes Paid
(47)
(31)
(48)
(40)
(24)
(15)
Brokerage & Risk Management EBITDA from Continuing Operations
(adjusted for unusual items) plus stock compensation expense less
capital expenditures, interest expense on corporate debt and corporate
overhead expenses, and taxes paid
206
228
212
202
98
141


36
For Additional Information
Website:
www.ajg.com
Email:
investor_relations@ajg.com
Marsha Akin
Marsha_Akin@ajg.com
Phone:
630-773-3800