NEW YORK (TheStreet) — Warren Buffett is considered the most respected and successful investor. Often called The Oracle of Omaha for his impressive investing prowess, he is among the world’s wealthiest people.

Buffett studied under the legendary Benjamin Graham at Columbia University who had a major impact on Buffett’s life and investment strategies.

Buffett is chairman of Omaha, Nebraska-based Berkshire Hathaway Inc (BRK.A ) which he built from a textile company into a major corporation with a market cap over $324 billion. Under Buffett’s leadership, Berkshire shares averaged a 19.7% compounded annual gain in per share book value from 1965-2013.

He follows a value investing strategy that is an adaptation of Graham’s approach: Discipline, patience and value consistently outperforms the market. His moves are followed by investors worldwide. Buffett seeks to acquire great companies trading at a discount to their intrinsic value, and to hold onto them for a long time. He will only invest in businesses that he understands, and always insists on a margin of safety.

Regarding the types of businesses Berkshire likes to purchase, Buffett has said,We want businesses to be one that we can understand, with favorable long-term prospects, operated by honest and competent people, and available at a very attractive price.

What follows are Buffett’s top 25 holdings as of September 30, 2014.

25. Precision Castparts Corp. (PCP )

Value of Holdings: $493 million

Portfolio Weighting as of 9/30/2014: 0.46%

Precision Castparts Corp. manufactures and sells metal components and products worldwide.

It operates in three segments: Investment Cast Products, Forged Products, and Airframe Products.

TheStreet Ratings team rates PRECISION CASTPARTS CORP as a Buy with a ratings score of B+. TheStreet Ratings Team has this to say about their recommendation:

We rate PRECISION CASTPARTS CORP (PCP) a BUY. This is driven by several positive factors, which we believe should have a greater impact than any weaknesses, and should give investors a better performance opportunity than most stocks we cover. The company’s strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures, growth in earnings per share, expanding profit margins and good cash flow from operations. We feel these strengths outweigh the fact that the company has had lackluster performance in the stock itself.

You can view the full analysis from the report here: PCP Ratings Report

Value of Holdings: $504 million

Portfolio Weighting as of 9/30/2014: 0.47%

Phillips 66 operates as an energy manufacturing and logistics company.

It operates in four segments: Midstream, Chemicals, Refining, Marketing and Specialties.

TheStreet Ratings team rates PHILLIPS 66 as a Hold with a ratings score of C. TheStreet Ratings Team has this to say about their recommendation:

We rate PHILLIPS 66 (PSX) a HOLD. The primary factors that have impacted our rating are mixed — some indicating strength, some showing weaknesses, with little evidence to justify the expectation of either a positive or negative performance for this stock relative to most other stocks. The company’s strengths can be seen in multiple areas, such as its compelling growth in net income, attractive valuation levels and largely solid financial position with reasonable debt levels by most measures. However, as a counter to these strengths, we also find weaknesses including weak operating cash flow and poor profit margins.

You can view the full analysis from the report here: PSX Ratings Report

Value of Holdings: $543 million

Portfolio Weighting as of 9/30/2014: 0.50%

Costco Wholesale Corporation, together with its subsidiaries, operates membership warehouses.

The company offers branded and private-label products in a range of merchandise categories.

TheStreet Ratings team rates COSTCO WHOLESALE CORP as a Buy with a ratings score of A+. TheStreet Ratings Team has this to say about their recommendation:

We rate COSTCO WHOLESALE CORP (COST) a BUY. This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that we rate. The company’s strengths can be seen in multiple areas, such as its revenue growth, growth in earnings per share, increase in net income, good cash flow from operations and increase in stock price during the past year. We feel these strengths outweigh the fact that the company has had somewhat disappointing return on equity.

You can view the full analysis from the report here: COST Ratings Report

Value of Holdings: $593 million

Portfolio Weighting as of 9/30/2014: 0.55%

Viacom Inc. operates as an entertainment content company in the United States and internationally.

The company creates television programs, motion pictures, short-form video, apps, consumer products, social media, and other entertainment content.

21. Chicago Bridge & Iron Company (CBI )

Value of Holdings: $619 million

Portfolio Weighting as of 9/30/2014: 0.57%

Chicago Bridge & Iron Company N.V. provides conceptual design, technology, engineering, procurement, fabrication, modularization, construction, commissioning, maintenance, program management, and environmental services to customers in the energy infrastructure worldwide.

TheStreet Ratings team rates CHICAGO BRIDGE & IRON CO as a Buy with a ratings score of B-. TheStreet Ratings Team has this to say about their recommendation:

We rate CHICAGO BRIDGE & IRON CO (CBI) a BUY. This is driven by multiple strengths, which we believe should have a greater impact than any weaknesses, and should give investors a better performance opportunity than most stocks we cover. The company’s strengths can be seen in multiple areas, such as its revenue growth, notable return on equity, impressive record of earnings per share growth, compelling growth in net income and attractive valuation levels. We feel these strengths outweigh the fact that the company shows weak operating cash flow.

You can view the full analysis from the report here: CBI Ratings Report

Value of Holdings: $664 million

Portfolio Weighting as of 9/30/2014: 0.62%

M&T Bank Corporation operates as the bank holding company for M&T Bank that provides commercial and retail banking services.

The company’s Business Banking segment offers deposit, lending, cash management, and other financial services to small businesses and professionals.

TheStreet Ratings team rates M & T BANK CORP as a Buy with a ratings score of B+. TheStreet Ratings Team has this to say about their recommendation:

We rate M & T BANK CORP (MTB) a BUY. This is driven by a number of strengths, which we believe should have a greater impact than any weaknesses, and should give investors a better performance opportunity than most stocks we cover. The company’s strengths can be seen in multiple areas, such as its good cash flow from operations, expanding profit margins and increase in stock price during the past year. We feel these strengths outweigh the fact that the company has had sub par growth in net income.

You can view the full analysis from the report here: MTB Ratings Report