Filed by Weyerhaeuser Company

Pursuant to Rule 425 under the Securities Act of 1933

and deemed filed pursuant to Rule 14a-12

under the Securities Exchange Act of 1934

Subject Company: Plum Creek Timber Company, Inc.

Commission File No.: 001-10239

The following is a slide presentation from the investor conference call hosted by Weyerhaeuser on November 9, 2015 to discuss the transaction:

Creating the World’s Premier Timber, Land & Forest Products Company WEYERHAEUSER & PLUM CREEK MERGER Exhibit 99.1

FORWARD-LOOKING STATEMENTS

AND NON-GAAP FINANCIAL MEASURES

This presentation contains statements that are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of

1995, including, without limitation, with respect to Weyerhaeuser’s and Plum Creek’s future results and performance, the expected benefits of the

proposed

transaction

such

as

efficiencies,

cost

savings

and

growth

potential

and

the

expected

timing

of

the

completion

of

the

transaction,

all

of

which

are

subject

to

risks

and

uncertainties.

Factors

listed

below,

as

well

as

other

factors,

may

cause

actual

results

to

differ

significantly

from

these forward-looking statements. There is no guarantee that any of the events anticipated by these forward-looking statements will occur. If any

of the events occur, there is no guarantee what effect they will have on company operations or financial condition. Neither Weyerhaeuser nor

Plum Creek will update these forward-looking statements after the date hereof.  Some forward-looking statements discuss Weyerhaeuser’s and

Plum Creek’s plans, strategies, expectations and intentions. They use words such as “expects,” “may,” “will,” “believes,” “should,” “approximately,”

“anticipates,” “estimates,” and “plans.” In addition, these words may use the positive or negative or other variations of those and similar words. 

Major risks, uncertainties and assumptions that affect Weyerhaeuser’s and Plum Creek’s businesses and may cause actual results to differ

materially from those expressed or implied in these forward-looking statements, including, without limitation, the failure to receive, on a timely

basis or otherwise, the required approval of Weyerhaeuser’s shareholders or Plum Creek’s stockholders with respect to the proposed transaction;

the

risk

that

any

of

the

conditions

to

closing

of

the

proposed

transaction

may

not

be

satisfied;

the

risk

that

the

businesses

of

Weyerhaeuser

and

Plum Creek will not be integrated successfully; the effect of general economic conditions, including employment rates, housing starts, interest rate

levels, availability of financing for home mortgages, and strength of the U.S. dollar; market demand for our products, which is related to the

strength of the various U.S. business segments and U.S. and international economic conditions; performance of our manufacturing operations,

including

maintenance

requirements;

the

level

of

competition

from

domestic

and

foreign

producers;

the

successful

execution

of

internal

performance

plans,

including

restructurings

and

cost

reduction

initiatives;

raw

material

prices;

energy

prices;

the

effect

of

weather;

the

risk

of

loss

from

fires,

floods,

windstorms,

hurricanes,

pest

infestation

and

other

natural

disasters;

transportation

availability

and

costs;

federal

tax

policies;

the

effect of forestry, land use, environmental and other governmental regulations; legal proceedings; performance of pension fund investments and

related derivatives; the effect of timing of retirements and changes in the market price of company stock on charges for stock-based

compensation; changes in accounting principles; and other factors described in Weyerhaeuser’s and Plum Creek’s filings with the SEC, including

the

“Risk

Factors”

section

in

Weyerhaeuser’s

and

Plum

Creek’s

respective

annual

reports

on

Form

10-K

for

the

year

ended

December

31,

2014.

Included in this presentation are certain non-GAAP financial measures which management believes complement the financial information

presented in accordance with U.S. generally accepted accounting principles. Management believes such measures may be useful to investors.

Our non-GAAP financial measures may not be comparable to similarly titled captions of other companies due to potential inconsistencies in the

metrics of calculation.

2

LEGENDS

NO OFFER OR SOLICITATION

This communication is neither an offer to purchase, nor a solicitation of an offer to sell, subscribe for or buy any securities or the solicitation of any

vote

or

approval

in

any

jurisdiction

pursuant

to

or

in

connection

with

the

proposed

transaction

or

otherwise,

nor

shall

there

be

any

sale,

issuance

or transfer of securities in any jurisdiction in contravention of applicable law.

ADDITIONAL INFORMATION AND WHERE TO FIND IT

The proposed transaction involving Weyerhaeuser and Plum Creek will be submitted to Weyerhaeuser’s shareholders and Plum Creek’s

stockholders for their consideration. In connection with the proposed transaction, Weyerhaeuser intends to file with the SEC a registration

statement on Form S-4 (the “Registration Statement”), which will include a prospectus with respect to Weyerhaeuser’s common shares to be

issued in the proposed transaction and a joint proxy statement for Weyerhaeuser’s shareholders and Plum Creek’s stockholders (the “Joint Proxy

Statement”) and each of Weyerhaeuser and Plum Creek will mail the Joint Proxy Statement to their respective shareholders or stockholders, as

applicable, and file other documents regarding the proposed transaction with the SEC. SECURITY HOLDERS ARE URGED AND ADVISED TO

READ ALL RELEVANT MATERIALS FILED WITH THE SEC, INCLUDING THE REGISTRATION STATEMENT AND THE JOINT PROXY

STATEMENT, CAREFULLY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE

PROPOSED TRANSACTION AND RELATED MATTERS. The Registration Statement, the Joint Proxy Statement and other relevant materials

(when they become available) and any other documents filed or furnished by Weyerhaeuser or Plum Creek with the SEC may be obtained free of

charge at the SEC’s web site at www.sec.gov. In addition, security holders will be able to obtain free copies of the Registration Statement and the

Joint Proxy Statement from Weyerhaeuser upon written request to Weyerhaeuser Company, 33663 Weyerhaeuser Way South, Federal Way,

Washington

98003,

Attention:

Director,

Investor

Relations,

or

by

calling

(253)

924-2058,

or

from

Plum

Creek

upon

written

request

to

Plum

Creek,

601 Union Street, Suite 3100, Seattle Washington 98101, Attention: Investor Relations, or by calling (800) 858-5347.

PARTICIPANTS IN THE SOLICITATION

Weyerhaeuser, Plum Creek, their respective directors and certain of their respective executive officers and employees may be deemed to be

participants in the solicitation of proxies in connection with the proposed transaction. Information about Weyerhaeuser’s directors and executive

officers

is

set

forth

in

its

definitive

proxy

statement

for

its

2015

Annual

Meeting

of

Shareholders,

which

was

filed

with

the

SEC

on

April

1,

2015,

and information about Plum Creek’s directors and executive officers is set forth in its definitive proxy statement for its 2015 Annual Meeting of

Stockholders, which was filed with the SEC on March 26, 2015. These documents are available free of charge from the sources indicated above,

and

from

Weyerhaeuser

by

going

to

its

investor

relations

page

on

its

corporate

web

site

at

www.weyerhaeuser.com

and

from

Plum

Creek

by

going to its investor relations page on its corporate web site at www.plumcreek.com.

Additional

information

regarding

the

interests

of

participants

in

the

solicitation

of

proxies

in

connection

with

the

proposed

transaction

will

be

included in the Registration Statement, the Joint Proxy Statement and other relevant materials Weyerhaeuser and Plum Creek intend to file with

the SEC.

3

PARTICIPANTS Rick R. Holley Chief Executive Officer Doyle R. Simons Chief Executive Officer

STRATEGIC ANNOUNCEMENTS Weyerhaeuser and Plum Creek to merge Strategic review of Weyerhaeuser’s Cellulose Fibers business

THE INDUSTRY LEADER More than 13 million acres of diverse and productive timberland Largest private timberland owner in the South and Pacific Northwest Best practices and economies of scale drive enhanced performance Uniquely positioned to capitalize on housing recovery Ability to further leverage HBU potential across the combined portfolio Low-cost manufacturing assets Enhanced platform for future growth PROVEN LEADERSHIP Best-in-class management selected from two proven industry leaders Relentless focus on driving value for shareholders Recognized commitment to sustainable resource management SIGNIFICANT FINANCIAL BENEFITS $23 billion equity market cap $2.5 billion share repurchase $100 million in annual synergies FAD per share accretion in the first full year Attractive dividend Strong balance sheet WY + PCL = A WINNING COMBINATION Creating the World’s Premier Timber, Land & Forest Products Company

Merger Structure Stock-for-stock merger: 1.60 WY shares issued for each PCL share Implied premium: 13.8% to the 30-trading-day VWAP ratio of PCL:WY* Pro forma ownership: WY shareholders (65%) and PCL shareholders (35%) Timing: Expected to close in late first quarter or early second quarter of 2016 Approvals: WY and PCL shareholder votes required MERGER SUMMARY ill Board & Management Non-executive chairman: Rick Holley President & CEO: Doyle Simons 13-member board: 8 from WY; 5 from PCL Executive team: Selected from top talent at both companies Name Weyerhaeuser (NYSE: WY) Financial Impact Share repurchase: $2.5 billion (net impact similar to approx. 70% stock, 30% cash transaction) Synergies: $100 million in annual cost synergies Accretion: FAD per share accretion in first full year** Dividend: WY expects to maintain $1.24 per common share annual dividend, representing a 13% dividend increase to PCL shareholders *Calculated as a 30-trading-day Plum Creek VWAP divided by a 30-trading-day Weyerhaeuser VWAP as compared to 1.60 X fixed exchange ratio **Assuming full run-rate cost synergies of $100 million per annum

Focused Portfolio Creates the world’s premier timber, land & forest products company More than 13 million acres of productive and diverse timberlands Combines #1 and #2 land holdings in the U.S. South Largest private timberland owner in the U.S. Leading forest products manufacturing operations Review of strategic alternatives for WY Cellulose Fibers COMBINATION TO DRIVE VALUE FOR ALL SHAREHOLDERS ill Disciplined Capital Allocation Financial strength $2.5 billion post-closing share repurchase Maintain $1.24 per common share annual dividend Investment grade balance sheet Industry-Leading Performance Complementary expertise to capture additional value Silviculture Logistics and marketing Rural and development land value Natural resources and royalties Merger Unites the Two Industry Leaders With Complementary Capabilities

COMBINING THE TWO INDUSTRY LEADERS Equity Market Cap $16 billion $7 billion $23 billion* Total Acreage** 6.9 million acres 6.3 million acres 13.2 million acres EBITDA*** $1.6 billion $0.6 billion $2.2 billion Credit Rating Investment Grade Investment Grade Committed to Investment Grade COMBINED Creating the World’s Premier Timber, Land & Forest Products Company *Equity market cap as of 11-6-2015 **Acreage based on pro forma *** Combined 2014 Adjusted EBITDA reflects summation of Adjusted EBITDAs as defined by each company.  Prior to proposed share repurchase ownership as of 9-30-15Adjusted EBITDA definitions differ by company.

UNPARALLELED SCALE IN TIMBERLAND OWNERSHIP Weyerhaeuser Plum Creek COMBINED ACREAGE MORE THAN 13 MILLION ACRES* *Includes 0.3 million acres in Uruguay. Acreage based on pro forma ownership as of 9-30-15

DIVERSE AND PRODUCTIVE TIMBERLANDS PACIFIC NORTHWEST High-value softwood saw logs, mostly Douglas fir Primarily serves West Coast housing and Asian export markets NORTHERN REGION Mixed hardwoods High-value hardwood sawlog & pulpwood markets Inland West softwood sawlogs URUGUAY Fast-growing eucalyptus and pine SOUTHERN REGION Highly productive Southern Yellow Pine forests Primarily serves the U.S. housing market 13.2 MILLION ACRES TOTAL* 2% 323,000 acres Uruguay 56% 7.3 million acres Southern Region 22% 3.0 million acres Pacific Northwest 20% 2.6 million acres Northern Region *Acreage based on pro forma ownership as of 9-30-15

DELIVERING THE HIGHEST VALUE OF EVERY ACRE TIMBER VALUE Provide unmatched scale and diversity Enhance productivity through advanced silviculture Optimize logistics and marketing Continue best-in-class sustainable resource management RURAL & DEVELOPMENT LAND VALUE Capture premium recreation & conservation values Create value through entitlement of select lands OTHER NATURAL RESOURCE VALUE Maximize value from surface & subsurface resources Provide ongoing royalty streams Complementary Land Management Expertise

LEADING WOOD PRODUCTS MANUFACTURING Continued improvement through operational excellence Well-positioned to benefit from improving housing markets 18 lumber mills 6 OSB mills 6 engineered wood mills 21 distribution centers 3 veneer / plywood facilities 2 lumber mills 2 plywood facilities 1 medium density fiberboard mill Timberlands ownership

COMPELLING SYNERGIES $100 million of cost synergies Primarily corporate and operating overhead cost savings Run rate achieved by end of first full year Additional synergies from: Best practice sharing across the portfolio Increased harvest and fulfillment optimization and flexibility Operational excellence efficiencies in transportation and logging Forest management scale and infrastructure Creating the World’s Premier Timber, Land & Forest Products Company

DISCIPLINED CAPITAL ALLOCATION Return cash to shareholders Growing and sustainable dividend Share repurchase Invest in our businesses Deliver the highest return on every acre Reduce manufacturing cost structure Maintain appropriate capital structure Continued Commitment to Superior Capital Allocation

FINANCING STRATEGY No financing needed to close the merger Shortly after closing, WY will execute a $2.5 billion share repurchase Substantially all of the $2.5 billion share repurchase is expected to be completed via accelerated share repurchase Will result in a net financial impact on the company that is as if the transaction were structured with approximately 70% stock and 30% cash Share repurchase will be funded with: Balance sheet cash Bonds Bank debt Merger and share repurchase are not contingent on outcome of strategic review of Cellulose Fibers Committed to an investment grade credit rating Creating the World’s Premier Timber, Land & Forest Products Company

MANAGEMENT TEAM Doyle Simons President & Chief Executive Officer Tom Lindquist EVP, Real Estate, Energy & Natural Resources Rhonda Hunter SVP, Timberlands Adrian Blocker SVP, Wood Products Tim Punke SVP, Corporate Affairs Denise Merle SVP, Human Resources Russell Hagen SVP, Chief Financial Officer Devin Stockfish SVP, General Counsel & Corporate Secretary Creating the World’s Premier Timber, Land & Forest Products Company

CELLULOSE FIBERS: STRATEGIC ALTERNATIVES Maximizing the Value of the Cellulose Fibers Business for Shareholders Weyerhaeuser board authorized exploration of strategic alternatives for Cellulose Fibers business Weyerhaeuser’s Cellulose Fibers business is one of the world’s largest producers of absorbent fluff pulp used in products such as diapers Alternatives include continuing to hold and operate the business, or a sale or spin-off of the business Cathy Slater will continue to lead this business throughout the review process

THE INDUSTRY LEADER More than 13 million acres of diverse and productive timberland Largest private timberland owner in the South and Pacific Northwest Best practices and economies of scale drive enhanced performance Uniquely positioned to capitalize on housing recovery Ability to further leverage HBU potential across the combined portfolio Low-cost manufacturing assets Enhanced platform for future growth PROVEN LEADERSHIP Best-in-class management selected from two proven industry leaders Relentless focus on driving value for shareholders Recognized commitment to sustainable resource management SIGNIFICANT FINANCIAL BENEFITS $23 billion equity market cap $2.5 billion share repurchase $100 million in annual synergies FAD per share accretion in the first full year Attractive dividend Strong balance sheet WY + PCL = A WINNING COMBINATION Creating the World’s Premier Timber, Land & Forest Products Company