THE OAKMARK FUND

Report from Bill Nygren and Kevin Grant, Portfolio Managers

William C. Nygren photo Kevin G. Grant photo

THE VALUE OF A $10,000 INVESTMENT IN THE OAKMARK FUND FROM ITS INCEPTION (8/5/91) TO PRESENT (3/31/06) AS COMPARED TO THE STANDARD & POOR’S 500 INDEX4
Oakmark Fund Chart

Average Annual Total Returns
(as of 3/31/06)
 Total Return
Last 3 Months*
 1-year  5-year  10-year Since
Inception
(8/5/91)

Oakmark Fund (Class I) 3.82% 4.76% 6.23% 8.41% 15.40%
S&P 500 4.21% 11.73% 3.97% 8.95% 10.82%
Dow Jones Average 6 4.24% 8.26% 4.59% 9.23% 11.85%
Lipper Large Cap Value Index7 4.40% 11.86% 4.83% 8.70% 10.61%

The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
The performance data quoted represents past performance. The above performance information for the Fund does not reflect the imposition of a 2% redemption fee on shares held for 90 days or less to deter market timers. If reflected, the fee would reduce the performance quoted. Past performance does not guarantee future results. The investment return and principal value will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Current performance may be lower or higher than the performance data quoted. Average annual total return measures annualized change, while total return measures aggregate change. To obtain most recent month-end performance data, visit www.oakmark.com.
* Not annualized

The Oakmark Fund achieved another new all-time high NAV8 last quarter, advancing by 4%. This increase was consistent with the 4% gain achieved by the S&P 500. Twelve stocks in the portfolio increased by 10% or more. Sun Microsystems was our best performer, advancing by 22% as Sun’s new products finally lived up to expectations. We’ve endured some false starts—and a lot of volatility—since our initial purchase of Sun three-and-a-half years ago, when it was considered a dying company, but it has been an excellent stock. Our worst performer for the quarter, Intel, reported results that were, to us, modestly disappointing. The market reacted as if the shortfall was much more serious. We believed the stock was cheap before the bad news. So, after the market’s overreaction, we increased our position. During the quarter we sold our shares of Knight Ridder and added Dell Computer.

Dell Computer (DELL—$30)

When we started managing The Oakmark Fund we viewed Dell as one of those great businesses that was unlikely to ever get priced cheaply enough for us to own it. In March of 2000, Dell stock peaked at $60—a robust 88 times trailing earnings. Dell’s business has performed well since then, with sales and EPS9 both more than doubling. Dell’s stock, however, hasn’t done so well, now selling for just half the price it did six years ago. The world’s largest manufacturer and distributor of PCs is now priced at less than 16 times expected 2007 earnings. At this price, Dell is selling at only a slight premium to the average company’s P/E5 multiple, and it actually sells at a discount after adjusting for its large cash balance. We think Dell’s brand name and low cost structure will provide an enduring competitive advantage that will allow the company to continue growing faster than most businesses, which will warrant the stock selling at a significant premium.

Best wishes,

William C. Nygren signature Kevin G. Grant signature
William C. Nygren, CFA
Portfolio Manager
bnygren@oakmark.com
Kevin G. Grant, CFA
Portfolio Manager
kgrant@oakmark.com

THE OAKMARK FUND

Schedule of Investments—March 31, 2006 (Unaudited)

Name Shares Held Market Value

Common Stocks—95.0%    
Apparel Retail—4.2%    
Limited Brands 4,828,047 $118,094,030
The Gap, Inc. 6,266,700 117,061,956
   
    235,155,986
Broadcasting & Cable TV—9.0%    
Liberty Media Corporation, Class A (a) 15,299,400 $125,608,074
The DIRECTV Group, Inc. (a) 6,950,000 113,980,000
Comcast Corporation, Special Class A (a) 3,925,000 102,521,000
EchoStar Communications Corporation, Class A (a) 2,775,000 82,889,250
CBS Corporation, Class B 2,239,745 53,709,085
Discovery Holding Company, Class A (a) 1,878,140 28,172,100
   
    506,879,509
Department Stores—2.0%    
Kohl's Corporation (a) 2,150,000 $113,971,500
     
Home Improvement Retail—2.4%    
The Home Depot, Inc. 3,231,500 $136,692,450
     
Homebuilding—2.0%    
Pulte Homes, Inc. 2,900,000 $111,418,000
     
Household Appliances—1.8%    
The Black & Decker Corporation 1,150,000 $99,923,500
     
Housewares & Specialties—2.1%    
Fortune Brands, Inc. 1,450,000 $116,913,500
     
Leisure Products—1.1%    
Mattel, Inc. 3,474,300 $62,989,059
     
Motorcycle Manufacturers—2.1%    
Harley-Davidson, Inc. 2,250,000 $116,730,000
     
Movies & Entertainment—6.2%    
The Walt Disney Company 5,100,000 $142,239,000
Time Warner, Inc. 7,647,700 128,404,883
Viacom, Inc., Class B (a) 2,039,745 79,142,106
   
    349,785,989
Publishing—1.4%    
Gannett Co., Inc. 1,334,500 $79,963,240
     
Restaurants—5.6%    
McDonald's Corporation 4,850,000 $166,646,000
Yum! Brands, Inc. 2,974,000 145,309,640
   
    311,955,640
Specialized Consumer Services—2.2%    
H&R Block, Inc. 5,658,600 $122,508,690
     
Brewers—3.6%    
Anheuser-Busch Companies, Inc. 2,750,000 $117,617,500
InBev NV (b) 1,850,000 86,748,082
   
    204,365,582
Distillers & Vintners—1.5%    
Diageo plc (c) 1,371,000 $86,962,530
     
Hypermarkets & Super Centers—2.2%    
Wal-Mart Stores, Inc. 2,600,000 $122,824,000
     
Packaged Foods & Meats—2.9%    
General Mills, Inc. 1,806,000 $91,528,080
H.J. Heinz Company 1,950,000 73,944,000
   
    165,472,080
Soft Drinks—1.2%    
Coca-Cola Enterprises, Inc. 3,300,000 $67,122,000
     
Integrated Oil & Gas—0.7%    
ConocoPhillips 620,670 $39,195,310
     
Oil & Gas Exploration & Production—1.5%    
Burlington Resources, Inc. 942,200 $86,597,602
     
Asset Management & Custody Banks—1.4%    
The Bank of New York Company, Inc. 2,150,000 $77,486,000
     
Diversified Banks—1.9%    
U.S. Bancorp 3,550,000 $108,275,000
     
Life & Health Insurance—1.5%    
AFLAC Incorporated 1,817,000 $82,001,210
     
Other Diversified Financial Services—4.3%    
JP Morgan Chase & Co. 3,000,000 $124,920,000
Citigroup, Inc. 2,450,000 115,713,500
   
    240,633,500
Thrifts & Mortgage Finance—4.7%    
Washington Mutual, Inc. 4,387,300 $186,986,726
MGIC Investment Corporation 1,140,600 75,998,178
   
    262,984,904
Health Care Equipment—2.1%    
Baxter International, Inc. 3,050,000 $118,370,500
     
Name Shares Held/
Par Value
Market Value

Pharmaceuticals—3.9%    
Bristol-Myers Squibb Company 4,500,000 $110,745,000
Abbott Laboratories 2,537,300 107,759,131
   
    218,504,131
Aerospace & Defense—3.9%    
Raytheon Company 2,800,000 $128,352,000
Honeywell International, Inc. 2,100,000 89,817,000
   
    218,169,000
Building Products—2.2%    
Masco Corporation 3,733,600 $121,304,664
     
Industrial Conglomerates—1.2%    
Tyco International Ltd. (b) 2,558,000 $68,759,040
     
Computer Hardware—5.3%    
Sun Microsystems, Inc. (a) 21,270,000 $109,115,100
Hewlett-Packard Company 3,025,000 99,522,500
Dell Inc. (a) 3,000,000 89,280,000
   
    297,917,600
Data Processing & Outsourced Services—2.4%    
First Data Corporation 2,925,000 $136,948,500
     
Office Electronics—1.4%    
Xerox Corporation (a) 5,272,400 $80,140,480
     
Semiconductors—3.1%    
Texas Instruments Incorporated 2,800,000 $90,916,000
Intel Corp. 4,200,000 81,270,000
   
    172,186,000
     
Total Common Stocks (Cost: $4,000,351,488)   5,341,106,696
     
Short Term Investments—5.1%    
U.S. Government Bills—2.6%    
United States Treasury Bills, 4.34% - 4.585% due 4/13/2006 - 4/27/2006 $150,000,000 $149,645,195
Total U.S. Government Bills (Cost: $149,645,195)   149,645,195
     
Name Par Value Market Value

Repurchase Agreements—2.5%    
IBT Repurchase Agreement, 4.55% dated 3/31/2006 due 4/3/2006, repurchase price $137,552,135, collateralized by a Government National Mortgage Association Bond with a rate of 5.000%, with a maturity date of 8/20/2034, and with a market value plus accrued interest of $22,819,712, and by Small Business Administration Bonds, with rates of 7.000% - 8.080%, with maturities from 10/25/2022 - 8/25/2030, and with an aggregate market value plus accrued interest of $121,555,288 $137,500,000 $137,500,000
     
IBT Repurchase Agreement, 3.25% dated 3/31/2006 due 4/3/2006, repurchase price $1,941,427, collateralized by a Small Business Administration Bond, with a rate of 7.125%, with a maturity date of 7/25/2025, and with a market value plus accrued interest of $2,037,946 1,940,901 1,940,901
   
Total Repurchase Agreements (Cost: $139,440,901)   139,440,901
     
Total Short Term Investments (Cost: $289,086,096)   289,086,096
     
Total Investments (Cost $4,289,437,584)—100.1%   $5,630,192,792
Other Liabilities In Excess Of Other Assets—(0.1%)   (6,592,166)
   
Total Net Assets—100%   $5,623,600,626
   
(a) Non-income producing security.
(b) Represents a foreign domiciled corporation.
(c) Represents an American Depository Receipt.