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SECURITIES AND EXCHANGE COMMISSION FORM N-Q Quarterly schedule of portfolio holdings of registered management investment company filed on Form N-Q Filing Date: 2016-03-30 Period of Report: 2016-01-31 SEC Accession No. 0000051931-16-002228 (HTML Version on secdatabase.com) WASHINGTON MUTUAL INVESTORS FUND CIK:104865 IRS No.: 520793788 Fiscal Year End: 0430 Type: N-Q Act: 40 File No.: 811-00604 Film No.: 161538155 FILER Mailing Address Business Address 6455 IRVINE CENTER DRIVE 333 S HOPE ST - 55TH FL IRVINE CA 92618 (MICG) LOS ANGELES CA 90071 213-486-9200 Copyright 2016 www.secdatabase.com. All Rights Reserved.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-Q Quarterly Schedule of Portfolio Holdings of Registered Management Investment Company Investment Company Act File Number: 811-00604 Washington Mutual Investors Fund (Exact Name of Registrant as Specified in Charter) 6455 Irvine Center Drive Irvine, California 92618 (Address of Principal Executive Offices) Registrant's telephone number, including area code: (213) 486-9200 Date of fiscal year end: April 30 Date of reporting period: January 31, 2016 Jennifer L. Butler Washington Mutual Investors Fund 333 South Hope Street Los Angeles, California 90071 (Name and Address of Agent for Service)

ITEM 1 Schedule of Investments Washington Mutual Investors FundSM Investment portfolio January 31, 2016 unaudited Common stocks 97.31% Energy 9.63% Shares Value (000) Chevron Corp. 13,359,100 $ 1,155,161 ConocoPhillips 27,708,185 1,082,836 Enbridge Inc. 29,661,300 1,026,281 EOG Resources, Inc. 1,472,100 104,549 Exxon Mobil Corp. 2,957,400 230,234 Halliburton Co. 7,540,000 239,697 Noble Energy, Inc. 5,456,300 176,620 Pioneer Natural Resources Co. 5,934,323 735,559 Royal Dutch Shell PLC, Class B (ADR) 21,300,000 939,969 Schlumberger Ltd. 18,269,300 1,320,322 7,011,228 Materials 4.65% Air Products and Chemicals, Inc. 1,970,106 249,632 Dow Chemical Co. 9,455,752 397,142 E.I. du Pont de Nemours and Co. 23,136,134 1,220,662 Freeport-McMoRan Inc. 1,033,800 4,756 Koninklijke DSM NV (ADR) 2,414,900 29,607 Monsanto Co. 3,135,000 284,031 Nucor Corp. 4,940,700 193,033 Potash Corp. of Saskatchewan Inc. 1,331,100 21,697 Praxair, Inc. 8,668,300 866,830 Rio Tinto PLC (ADR) 1,216,800 29,994 WestRock Co. 2,441,322 86,130 3,383,514 Industrials 13.12% Boeing Co. 17,822,700 2,141,041 Caterpillar Inc. 5,096,207 317,188 Cummins Inc. 660,000 59,327

Danaher Corp. 521,100 45,153 Fastenal Co. 4,490,000 182,114 General Dynamics Corp. 1,339,461 179,180 General Electric Co. 35,393,000 1,029,936 Honeywell International Inc. 1,160,000 119,712 IDEX Corp. 527,400 38,242 Lockheed Martin Corp. 8,639,300 1,822,892 Norfolk Southern Corp. 2,476,000 174,558 Northrop Grumman Corp. 4,461,600 825,664 PACCAR Inc 5,600,000 274,792 Parker-Hannifin Corp. 600,000 58,296 Precision Castparts Corp. 649,500 152,600 Rockwell Automation 950,000 90,792 Rockwell Collins, Inc. 4,768,000 385,636 Union Pacific Corp. 7,448,000 536,256 United Technologies Corp. 2,900,000 254,301 Washington Mutual Investors Fund Page 1 of 7 unaudited Common stocks Industrials (continued) Shares Value (000) W.W. Grainger, Inc. 330,000 $ 64,908 Waste Management, Inc. 14,964,400 792,365 9,544,953 Consumer discretionary 11.52% Carnival Corp., units 985,800 47,447 CBS Corp., Class B 7,456,800 354,198 Comcast Corp., Class A 34,225,739 1,906,716 General Motors Co.1 400,000 11,856 Home Depot, Inc. 26,175,600 3,291,843 Lowe s Companies, Inc. 5,500,000 394,130 Newell Rubbermaid Inc. 5,419,100 210,153 Priceline Group Inc.1 102,000 108,627 Ralph Lauren Corp., Class A 1,156,000 130,050 Scripps Networks Interactive, Inc., Class A 636,400 38,801 Starbucks Corp. 2,985,600 181,435 Target Corp. 1,000,000 72,420 Time Warner Inc. 2,756,000 194,133

Twenty-First Century Fox, Inc., Class A 16,994,100 458,331 VF Corp. 11,230,200 703,010 Walt Disney Co. 2,199,700 210,775 Whirlpool Corp. 297,000 39,914 YUM! Brands, Inc. 413,200 29,903 8,383,742 Consumer staples 9.73% Coca-Cola Co. 51,018,000 2,189,693 Colgate-Palmolive Co. 2,375,000 160,384 Costco Wholesale Corp. 3,855,700 582,673 CVS Health Corp. 8,725,000 842,748 Kraft Heinz Co. 4,900,000 382,494 Kroger Co. 10,698,900 415,224 Mondelez International, Inc. 5,590,000 240,929 Nestlé SA (ADR) 1,635,900 120,631 PepsiCo, Inc. 2,663,000 264,436 Procter & Gamble Co. 17,095,700 1,396,548 Unilever NV 7,797,400 346,283 Walgreens Boots Alliance, Inc. 1,500,000 119,580 Wal-Mart Stores, Inc. 284,300 18,866 7,080,489 Health care 11.63% AbbVie Inc. 1,600,000 87,840 Aetna Inc. 5,302,800 540,037 AmerisourceBergen Corp. 282,700 25,319 AstraZeneca PLC (ADR) 7,477,100 240,912 Bristol-Myers Squibb Co. 9,525,600 592,111 Eli Lilly and Co. 3,847,200 304,314 Gilead Sciences, Inc.1 490,000 40,670 Humana Inc.2 7,620,000 1,240,460 Johnson & Johnson 11,365,000 1,186,961 Medtronic PLC 10,085,700 765,706 Merck & Co., Inc. 33,683,000 1,706,718 Novo Nordisk A/S, Class B (ADR) 2,847,100 159,067 Pfizer Inc. 29,074,800 886,491 Washington Mutual Investors Fund Page 2 of 7 unaudited

Common stocks Health care (continued) Shares Value (000) Quest Diagnostics Inc. 166,400 $ 10,927 Regeneron Pharmaceuticals, Inc.1 257,500 108,173 Roche Holding AG (ADR) 4,538,500 147,138 UnitedHealth Group Inc. 3,667,300 422,326 8,465,170 Financials 12.35% American Express Co. 5,376,151 287,624 Ameriprise Financial, Inc. 202,000 18,311 Capital One Financial Corp. 6,500,000 426,530 Charles Schwab Corp. 4,985,600 127,282 Chubb Ltd. 7,207,425 814,944 Citigroup Inc. 5,000,000 212,900 CME Group Inc., Class A 10,388,404 933,398 East West Bancorp, Inc. 2,000,000 64,840 Goldman Sachs Group, Inc. 2,190,500 353,897 JPMorgan Chase & Co. 26,660,500 1,586,300 KeyCorp 21,125,000 235,755 Marsh & McLennan Companies, Inc. 8,409,300 448,468 McGraw Hill Financial, Inc. 3,419,800 290,751 Moody s Corp. 2,693,800 240,125 PNC Financial Services Group, Inc. 7,408,800 641,973 Sumitomo Mitsui Financial Group, Inc. (ADR) 11,000,000 72,380 U.S. Bancorp 9,100,000 364,546 Wells Fargo & Co. 37,071,511 1,862,102 Willis Towers Watson PLC 44,900 5,140 8,987,266 Information technology 13.45% Accenture PLC, Class A 1,929,600 203,650 Alphabet Inc., Class A1 694,200 528,529 Alphabet Inc., Class C 267,693 198,883 Amphenol Corp., Class A 5,690,000 282,053 Analog Devices, Inc. 2,130,783 114,764 Automatic Data Processing, Inc. 2,021,300 167,950 Cisco Systems, Inc. 5,000,000 118,950 Intel Corp. 30,880,000 957,898 Intuit Inc. 4,255,000 406,395 Jack Henry & Associates, Inc. 2,594,200 210,597

KLA-Tencor Corp. 1,171,000 78,445 Microsoft Corp. 84,923,800 4,678,452 NetApp, Inc.1 2,059,600 45,167 Paychex, Inc. 3,000,000 143,580 Texas Instruments Inc. 20,473,800 1,083,678 Visa Inc., Class A 5,951,100 443,298 Xilinx, Inc. 2,432,900 122,302 9,784,591 Telecommunication services 4.05% AT&T Inc. 12,300,000 443,538 Verizon Communications Inc. 50,160,401 2,506,515 2,950,053 Washington Mutual Investors Fund Page 3 of 7 unaudited Common stocks Utilities 2.87% Shares Value (000) CMS Energy Corp. 5,405,800 $ 210,178 Dominion Resources, Inc. 8,267,000 596,629 Eversource Energy 3,947,500 212,376 Exelon Corp. 730,000 21,586 National Grid PLC (ADR) 730,000 51,691 PG&E Corp. 8,248,700 452,936 Pinnacle West Capital Corp. 3,000,000 198,930 Sempra Energy 1,996,900 189,206 Xcel Energy Inc. 4,000,000 152,880 2,086,412 Miscellaneous 4.31% Other common stocks in initial period of acquisition 3,133,398 Total common stocks (cost: $52,073,883,000) 70,810,816 Short-term securities 3.07% Principal amount (000) Abbott Laboratories 0.40% due 2/23/20163 $ 49,250 49,240 CAFCO, LLC 0.40% 0.49% due 2/26/2016 3/2/2016 139,500 139,452 Chevron Corp. 0.35% 0.49% due 2/9/2016 3/8/20163 43,700 43,688 Emerson Electric Co. 0.32% 0.46% due 2/29/2016 3/9/20163 140,000 139,947

Estée Lauder Companies Inc. 0.37% due 2/12/20163 7,700 7,699 Federal Home Loan Bank 0.13% 0.58% due 2/3/2016 8/29/2016 1,270,987 1,269,979 Freddie Mac 0.23% 0.41% due 3/10/2016 6/7/2016 155,000 154,803 General Electric Co. 0.29% due 2/1/2016 50,800 50,799 Honeywell International Inc. 0.26% due 2/17/20163 40,700 40,693 IBM Corp. 0.40% due 2/22/2016 2/23/20163 103,500 103,479 PepsiCo Inc. 0.37% due 3/8/20163 25,900 25,889 Private Export Funding Corp. 0.44% due 2/8/20163 25,400 25,398 Qualcomm Inc. 0.43% due 3/23/20163 30,200 30,182 U.S. Treasury Bills 0.21% due 2/18/2016 100,000 99,990 Walt Disney Co. 0.47% 0.48% due 4/20/2016 4/28/20163 51,300 51,242 Total short-term securities (cost: $2,232,398,000) 2,232,480 Total investment securities 100.38% (cost: $54,306,281,000) 73,043,296 Other assets less liabilities (0.38%) (273,833) Net assets 100.00% $72,769,463 Washington Mutual Investors Fund Page 4 of 7 unaudited As permitted by U.S. Securities and Exchange Commission regulations, Miscellaneous securities include holdings in their first year of acquisition that have not previously been publicly disclosed. Investments in affiliates A company is an affiliate of the fund under the Investment Company Act of 1940 if the fund s holdings in that company represent 5% or more of the outstanding voting shares. Further details on these holdings and related transactions during the nine months ended January 31, 2016, appear below. Beginning shares Additions Reductions Ending shares Dividend income (000) Value of affiliates at 1/31/2016 (000)

Humana Inc. 7,620,000 7,620,000 $ 6,629 $ 1,240,460 KLA-Tencor Corp.4 8,038,000 6,867,000 1,171,000 8,808 $15,437 $1,240,460 1 Security did not produce income during the last 12 months. 2 Represents an affiliated company as defined under the Investment Company Act of 1940. 3 Acquired in a transaction exempt from registration under Section 4(2) of the Securities Act of 1933. May be resold in the U.S. in transactions exempt from registration, normally to qualified institutional buyers. The total value of all such securities was $517,457,000, which represented.71% of the net assets of the fund. 4 Unaffiliated issuer at 1/31/2016. Valuation disclosures Capital Research and Management Company ( CRMC ), the fund s investment adviser, values the fund s investments at fair value as defined by accounting principles generally accepted in the United States of America. The net asset value of each share class of the fund is generally determined as of approximately 4:00 p.m. New York time each day the New York Stock Exchange is open. Security transactions are recorded by the fund as of the date the trades are executed with brokers. Methods and inputs The fund s investment adviser uses the following methods and inputs to establish the fair value of the fund s assets and liabilities. Use of particular methods and inputs may vary over time based on availability and relevance as market and economic conditions evolve. Equity securities are generally valued at the official closing price of, or the last reported sale price on, the exchange or market on which such securities are traded, as of the close of business on the day the securities are being valued or, lacking any sales, at the last available bid price. Prices for each security are taken from the principal exchange or market on which the security trades. Fixed-income securities, including short-term securities, are generally valued at prices obtained from one or more pricing vendors. Vendors value such securities based on one or more of the following inputs: benchmark yields, transactions, bids, offers, quotations from dealers and trading systems, new issues, spreads, interest rate volatilities, and other relationships observed in the markets among comparable securities; and proprietary pricing models such as yield measures calculated using factors such as cash flows, financial or collateral performance and other reference data. When the fund s investment adviser deems it appropriate to do so (such as when vendor prices are unavailable or deemed to be not representative), fixedincome securities will be valued in good faith at the mean quoted bid and ask prices that are reasonably and timely available (or bid prices, if ask prices are not available) or at prices for securities of comparable maturity, quality and type. Securities with both fixed-income and equity characteristics, or equity securities traded principally among fixed-income dealers, are generally valued in the manner described for either equity or fixed-income securities, depending on which method is deemed most appropriate by the fund s investment adviser. Securities and other assets for which representative market quotations are not readily available or are considered unreliable by the fund s investment adviser are fair valued as determined in good faith under fair valuation guidelines adopted by authority of the fund s board of trustees as further described. The investment adviser follows fair valuation guidelines, consistent with U.S. Securities and Exchange Commission rules and guidance, to consider relevant principles and factors when making fair value determinations. The investment adviser considers relevant indications of value that are reasonably and timely available to it in determining the fair value to be assigned to a particular security, such as the type and cost of the security; contractual or legal restrictions on resale of the security; relevant financial or business developments of the issuer; actively traded similar or related Washington Mutual Investors Fund Page 5 of 7 unaudited securities; conversion or exchange rights on the security; related corporate actions; significant events occurring after the close of trading in the security; and changes in overall market conditions. In addition, the closing prices of equity securities that trade in markets outside U.S. time zones may be adjusted to reflect significant events that occur after the close of local trading but before the net asset value of each share class of the fund is determined. Fair valuations and valuations of investments that are not actively trading involve judgment and may differ materially from valuations that would have been used had greater market activity occurred. Processes and structure The fund s board of trustees has delegated authority to the fund s investment adviser to make fair value determinations, subject to board oversight. The investment adviser has established a Joint Fair Valuation Committee (the Fair Valuation Committee ) to administer,

implement and oversee the fair valuation process, and to make fair value decisions. The Fair Valuation Committee regularly reviews its own fair value decisions, as well as decisions made under its standing instructions to the investment adviser s valuation teams. The Fair Valuation Committee reviews changes in fair value measurements from period to period and may, as deemed appropriate, update the fair valuation guidelines to better reflect the results of back testing and address new or evolving issues. The Fair Valuation Committee reports any changes to the fair valuation guidelines to the board of trustees with supplemental information to support the changes. The fund s board and audit committee also regularly review reports that describe fair value determinations and methods. The fund s investment adviser has also established a Fixed-Income Pricing Review Group to administer and oversee the fixed-income valuation process, including the use of fixed-income pricing vendors. This group regularly reviews pricing vendor information and market data. Pricing decisions, processes and controls over security valuation are also subject to additional internal reviews, including an annual control self-evaluation program facilitated by the investment adviser s compliance group. Classifications The fund s investment adviser classifies the fund s assets and liabilities into three levels based on the inputs used to value the assets or liabilities. Level 1 values are based on quoted prices in active markets for identical securities. Level 2 values are based on significant observable market inputs, such as quoted prices for similar securities and quoted prices in inactive markets. Certain securities trading outside the U.S. may transfer between Level 1 and Level 2 due to valuation adjustments resulting from significant market movements following the close of local trading. Level 3 values are based on significant unobservable inputs that reflect the investment adviser s determination of assumptions that market participants might reasonably use in valuing the securities. The valuation levels are not necessarily an indication of the risk or liquidity associated with the underlying investment. For example, U.S. government securities are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market. The following table presents the fund s valuation levels as of January 31, 2016 (dollars in thousands): Investment securities Level 1 Level 2 Level 3 Total Assets: Common stocks: Energy $ 7,011,228 $ $ $ 7,011,228 Materials 3,383,514 3,383,514 Industrials 9,544,953 9,544,953 Consumer discretionary 8,383,742 8,383,742 Consumer staples 7,080,489 7,080,489 Health care 8,465,170 8,465,170 Financials 8,987,266 8,987,266 Information technology 9,784,591 9,784,591 Telecommunication services 2,950,053 2,950,053 Utilities 2,086,412 2,086,412 Miscellaneous 3,133,398 3,133,398 Short-term securities 2,232,480 2,232,480 Total $70,810,816 $2,232,480 $ $73,043,296 Federal income tax information (dollars in thousands) Gross unrealized appreciation on investment securities $20,748,655 Gross unrealized depreciation on investment securities (2,041,847) Net unrealized appreciation on investment securities 18,706,808 Cost of investment securities 54,336,488

Washington Mutual Investors Fund Page 6 of 7 unaudited Key to abbreviation ADR = American Depositary Receipts Investments are not FDIC-insured, nor are they deposits of or guaranteed by a bank or any other entity, so they may lose value. Investors should carefully consider investment objectives, risks, charges and expenses. This and other important information is contained in the fund prospectus and summary prospectus, which can be obtained from your financial professional and should be read carefully before investing. You may also call American Funds Service Company (AFS) at (800) 421-4225 or visit the American Funds website at americanfunds.com.

MFGEFPX-001-0316O-S49131 Washington Mutual Investors Fund Page 7 of 7 ITEM 2 Controls and Procedures The Registrant s Principal Executive Officer and Principal Financial Officer have concluded, based on their evaluation of the Registrant s disclosure controls and procedures (as such term is defined in Rule 30a-3 under the Investment Company Act of 1940), that such controls and procedures are adequate and reasonably designed to achieve the purposes described in paragraph (c) of such rule. There were no changes in the Registrant s internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) that occurred during the Registrant s last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Registrant s internal control over financial reporting. ITEM 3 Exhibits The certifications required by Rule 30a-2 of the Investment Company Act of 1940 and Section 302 of the Sarbanes-Oxley Act of 2002 are attached as exhibits hereto.

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. WASHINGTON MUTUAL INVESTORS FUND By _/s/ Paul F. Roye Paul F. Roye, Executive Vice President and Principal Executive Officer Date: March 30, 2016 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated. By _/s/ Paul F. Roye Paul F. Roye, Executive Vice President and Principal Executive Officer Date: March 30, 2016 By _/s/ Brian C. Janssen Brian C. Janssen, Treasurer and Principal Financial Officer Date: March 30, 2016

Washington Mutual Investors Fund 6455 Irvine Center Drive Irvine, California 92618 (213) 486-9200 CERTIFICATION I, Paul F. Roye, certify that: 1. I have reviewed this report on Form N-Q of Washington Mutual Investors Fund; 2. 3. 4. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; Based on my knowledge, the schedules of investments included in this report fairly present in all material respects the investments of the registrant as of the end of the fiscal quarter for which this report is filed; The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal controls over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have: a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles; c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and d) Disclosed in this report any change in the registrant s internal control over financial reporting that occurred during the registrant s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant s internal control over financial reporting; and 5. The registrant's other certifying officer(s) and I have disclosed to the registrant's auditors and the audit committee of the registrant's Board of Trustees (or persons performing the equivalent functions): a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant s ability to record, process, summarize, and report financial information; and b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting. Date: March 30, 2016 /s/ Paul F. Roye

Paul F. Roye, Executive Vice President and Principal Executive Officer Washington Mutual Investors Fund

Washington Mutual Investors Fund 6455 Irvine Center Drive Irvine, California 92618 (213) 486-9200 CERTIFICATION I, Brian C. Janssen, certify that: 1. I have reviewed this report on Form N-Q of Washington Mutual Investors Fund; 2. 3. 4. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; Based on my knowledge, the schedules of investments included in this report fairly present in all material respects the investments of the registrant as of the end of the fiscal quarter for which this report is filed; The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal controls over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have: a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles; c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and d) Disclosed in this report any change in the registrant s internal control over financial reporting that occurred during the registrant s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant s internal control over financial reporting; and 5. The registrant's other certifying officer(s) and I have disclosed to the registrant's auditors and the audit committee of the registrant's Board of Trustees (or persons performing the equivalent functions): a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant s ability to record, process, summarize, and report financial information; and b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting. Date: March 30, 2016 /s/ Brian C. Janssen

Brian C. Janssen, Treasurer and Principal Financial Officer Washington Mutual Investors Fund