Certified Semi-annual Shareholder Report for Management Investment Companies (n-csrs)

Notes to Financial Statements

October 31, 2012

(Unaudited)

NOTE 1—Significant Accounting Policies

Invesco Energy Fund (the “Fund”) is a series portfolio of AIM Sector Funds (Invesco Sector Funds) (the “Trust”). The Trust is a Delaware statutory trust registered under the Investment Company Act of 1940, as amended (the “1940 Act”), as an open-end series management investment company consisting of eleven separate portfolios, each authorized to issue an unlimited number of shares of beneficial interest. The assets, liabilities and operations of each portfolio are accounted for separately. Information presented in these financial statements pertains only to the Fund. Matters affecting each portfolio or class will be voted on exclusively by the shareholders of such portfolio or class.

The Fund’s investment objective is long-term growth of capital.

The Fund currently consists of six different classes of shares: Class A, Class B, Class C, Class Y, Investor Class and Class R5. On September 24, 2012, Institutional Class shares were renamed Class R5 shares. Investor Class shares of the Fund are offered only to certain grandfathered investors. Class A shares are sold with a front-end sales charge unless certain waiver criteria are met and under certain circumstances load waived shares may be subject to contingent deferred sales charges (“CDSC”). Class C shares are sold with a CDSC. Class Y, Investor Class and Class R5 shares are sold at net asset value. Effective November 30, 2010, new or additional investments in Class B shares are no longer permitted. Existing shareholders of Class B shares may continue to reinvest dividends and capital gains distributions in Class B shares until they convert to Class A shares. Also, shareholders in Class B shares will be able to exchange those shares for Class B shares of other Invesco Funds offering such shares until they convert to Class A shares. Generally, Class B shares will automatically convert to Class A shares on or about the month-end, which is at least eight years after the date of purchase. Redemption of Class B shares prior to the conversion date will be subject to a CDSC.

The following is a summary of the significant accounting policies followed by the Fund in the preparation of its financial statements.

A security listed or traded on an exchange (except convertible bonds) is valued at its last sales price or official closing price as of the close of the customary trading session on the exchange where the security is principally traded, or lacking any sales or official closing price on a particular day, the security may be valued at the closing bid price on that day. Securities traded in the over-the-counter market are valued based on prices furnished by independent pricing services or market makers. When such securities are valued by an independent pricing service they may be considered fair valued. Futures contracts are valued at the final settlement price set by an exchange on which they are principally traded. Listed options are valued at the mean between the last bid and ask prices from the exchange on which they are principally traded. Options not listed on an exchange are valued by an independent source at the mean between the last bid and ask prices. For purposes of determining net asset value per share, futures and option contracts generally are valued 15 minutes after the close of the customary trading session of the New York Stock Exchange (“NYSE”).

Investments in open-end and closed-end registered investment companies that do not trade on an exchange are valued at the end of day net asset value per share. Investments in open-end and closed-end registered investment companies that trade on an exchange are valued at the last sales price or official closing price as of the close of the customary trading session on the exchange where the security is principally traded.

9                         Invesco Energy Fund

Debt obligations (including convertible bonds) and unlisted equities are fair valued using an evaluated quote provided by an independent pricing service. Evaluated quotes provided by the pricing service may be determined without exclusive reliance on quoted prices, and may reflect appropriate factors such as institution-size trading in similar groups of securities, developments related to specific securities, dividend rate, yield, quality, type of issue, coupon rate, maturity, individual trading characteristics and other market data. Debt securities are subject to interest rate and credit risks. In addition, all debt securities involve some risk of default with respect to interest and/or principal payments.

Foreign securities (including foreign exchange contracts) are converted into U.S. dollar amounts using the applicable exchange rates as of the close of the NYSE. If market quotations are available and reliable for foreign exchange traded equity securities, the securities will be valued at the market quotations. Because trading hours for certain foreign securities end before the close of the NYSE, closing market quotations may become unreliable. If between the time trading ends on a particular security and the close of the customary trading session on the NYSE, events occur that are significant and make the closing price unreliable, the Fund may fair value the security. If the event is likely to have affected the closing price of the security, the security will be valued at fair value in good faith using procedures approved by the Board of Trustees. Adjustments to closing prices to reflect fair value may also be based on a screening process of an independent pricing service to indicate the degree of certainty, based on historical data, that the closing price in the principal market where a foreign security trade is not the current value as of the close of the NYSE. Foreign securities meeting the approved degree of certainty that the price is not reflective of current value will be priced at the indication of fair value from the independent pricing service. Multiple factors may be considered by the independent pricing service in determining adjustments to reflect fair value and may include information relating to sector indices, American Depositary Receipts and domestic and foreign index futures. Foreign securities may have additional risks including exchange rate changes, potential for sharply devalued currencies and high inflation, political and economic upheaval, the relative lack of issuer information, relatively low market liquidity and the potential lack of strict financial and accounting controls and standards.

Securities for which market prices are not provided by any of the above methods may be valued based upon quotes furnished by independent sources. The last bid price may be used to value equity securities. The mean between the last bid and asked prices is used to value debt obligations, including corporate loans.

Securities for which market quotations are not readily available or are unreliable are valued at fair value as determined in good faith by or under the supervision of the Trust’s officers following procedures approved by the Board of Trustees. Issuer specific events, market trends, bid/ask quotes of brokers and information providers and other market data may be reviewed in the course of making a good faith determination of a security’s fair value.

Valuations change in response to many factors including the historical and prospective earnings of the issuer, the value of the issuer’s assets, general economic conditions, interest rates, investor perceptions and market liquidity. Because of the inherent uncertainties of valuation, the values reflected in the financial statements may materially differ from the value received upon actual sale of those investments.

The Fund may periodically participate in litigation related to Fund investments. As such, the Fund may receive proceeds from litigation settlements. Any proceeds received are included in the Statement of Operations as realized gain (loss) for investments no longer held and as unrealized gain (loss) for investments still held.

Brokerage commissions and mark ups are considered transaction costs and are recorded as an increase to the cost basis of securities purchased and/or a reduction of proceeds on a sale of securities. Such transaction costs are included in the determination of net realized and unrealized gain (loss) from investment securities reported in the Statement of Operations and the Statement of Changes in Net Assets and the net realized and unrealized gains (losses) on securities per share in the Financial Highlights. Transaction costs are included in the calculation of the Fund’s net asset value and, accordingly, they reduce the Fund’s total returns. These transaction costs are not considered operating expenses and are not reflected in net investment income reported in the Statement of Operations and Statement of Changes in Net Assets, or the net investment income per share and ratios of expenses and net investment income reported in the Financial Highlights, nor are they limited by any expense limitation arrangements between the Fund and the investment adviser.

The Fund allocates income and realized and unrealized capital gains and losses to a class based on the relative net assets of each class.

The Fund files tax returns in the U.S. Federal jurisdiction and certain other jurisdictions. Generally, the Fund is subject to examinations by such taxing authorities for up to three years after the filing of the return for the tax period.

10                         Invesco Energy Fund

The Fund may invest in foreign securities which may be subject to foreign taxes on income, gains on investments or currency repatriation, a portion of which may be recoverable.

The businesses in which the Fund invests may be adversely affected by foreign, federal or state regulations governing energy production, distribution and sale. Although individual security selection drives the performance of the Fund, short-term fluctuations in commodity prices may cause price fluctuations in its shares.

11                         Invesco Energy Fund

Under the terms of a master sub-advisory agreement between the Adviser and each of Invesco Asset Management Deutschland GmbH, Invesco Asset Management Limited, Invesco Asset Management (Japan) Limited, Invesco Australia Limited, Invesco Hong Kong Limited, Invesco Senior Secured Management, Inc. and Invesco Canada Ltd. (collectively, the “Affiliated Sub-Advisers”) the Adviser, not the Fund, may pay 40% of the fees paid to the Adviser to any such Affiliated Sub-Adviser(s) that provide(s) discretionary investment management services to the Fund based on the percentage of assets allocated to such Sub-Adviser(s).

The Adviser has contractually agreed, through at least June 30, 2013, to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit total annual fund operating expenses after fee waiver and/or expense reimbursement (excluding certain items discussed below) of Class A, Class B, Class C, Class Y, Investor Class and Class R5 shares to 2.00%, 2.75%, 2.75%, 1.75%, 2.00% and 1.75%, respectively, of average daily net assets. In determining the Adviser’s obligation to waive advisory fees and/or reimburse expenses, the following expenses are not taken into account, and could cause the total annual fund operating expenses after fee waivers and/or expense reimbursement to exceed the numbers reflected above: (1) interest; (2) taxes; (3) dividend expense on short sales; (4) extraordinary or non-routine items, including litigation expenses; and (5) expenses that the Fund has incurred but did not actually pay because of an expense offset arrangement. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on June 30, 2013. The Adviser did not waive fees and/or reimburse expenses during the period under this expense limitation.

The Adviser has contractually agreed, through at least June 30, 2013, to waive the advisory fee payable by the Fund in an amount equal to 100% of the net advisory fees the Adviser receives from the affiliated money market funds on investments by the Fund of uninvested cash (excluding investments of cash collateral from securities lending) in such affiliated money market funds.

For the six months ended October 31, 2012, the Adviser waived advisory fees of $53,864.

The Trust has entered into a master administrative services agreement with Invesco pursuant to which the Fund has agreed to pay Invesco for certain administrative costs incurred in providing accounting services to the Fund. For the six months ended October 31, 2012, expenses incurred under the agreement are shown in the Statement of Operations as Administrative services fees .

The Trust has entered into a transfer agency and service agreement with Invesco Investment Services, Inc. (“IIS”) pursuant to which the Fund has agreed to pay IIS a fee for providing transfer agency and shareholder services to the Fund and reimburse IIS for certain expenses incurred by IIS in the course of providing such services. IIS may make payments to intermediaries that provide omnibus account services, sub-accounting services and/or networking services. All fees payable by IIS to intermediaries that provide omnibus account services or sub-accounting are charged back to the Fund, subject to certain limitations approved by the Trust’s Board of Trustees. For the six months ended October 31, 2012, expenses incurred under the agreement are shown in the Statement of Operations as Transfer agent fees .

The Trust has entered into master distribution agreements with Invesco Distributors, Inc. (“IDI”) to serve as the distributor for the Class A, Class B, Class C, Class Y, Investor Class and Class R5 shares of the Fund. The Trust has adopted plans pursuant to Rule 12b-1 under the 1940 Act with respect to the Fund’s Class A, Class B, Class C and Investor Class shares (collectively, the “Plans”). The Fund, pursuant to the Plans, pays IDI compensation at the annual rate of 0.25% of the Fund’s average daily net assets of Class A shares, 1.00% of the average daily net assets of Class B and Class C shares and 0.25% of the average daily net assets of Investor Class shares. Of the Plan payments, up to 0.25% of the average daily net assets of each class of shares may be paid to furnish continuing personal shareholder services to customers who purchase and own shares of such classes. Any amounts not paid as a service fee under the Plans would constitute an asset-based sales charge. Rules of the Financial Industry Regulatory Authority (“FINRA”) impose a cap on the total sales charges, including asset-based sales charges, that may be paid by any class of shares of the Fund. For the six months ended October 31, 2012, expenses incurred under the Plan are shown in the Statement of Operations as Distribution fees .

Front-end sales commissions and CDSC (collectively, the “sales charges”) are not recorded as expenses of the Fund. Front-end sales commissions are deducted from proceeds from the sales of Fund shares prior to investment in Class A shares of the Fund. CDSC are deducted from redemption proceeds prior to remittance to the shareholder. During the six months ended October 31, 2012, IDI advised the Fund that IDI retained $49,431 in front-end sales commissions from the sale of Class A shares and $2,199, $71,232 and $8,390 from Class A, Class B and Class C shares, respectively, for CDSC imposed on redemptions by shareholders.

Certain officers and trustees of the Trust are officers and directors of the Adviser, IIS and/or IDI.

12                         Invesco Energy Fund

NOTE 3—Additional Valuation Information

GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date, under current market conditions. GAAP establishes a hierarchy that prioritizes the inputs to valuation methods giving the highest priority to readily available unadjusted quoted prices in an active market for identical assets (Level 1) and the lowest priority to significant unobservable inputs (Level 3) generally when market prices are not readily available or are unreliable. Based on the valuation inputs, the securities or other investments are tiered into one of three levels. Changes in valuation methods may result in transfers in or out of an investment’s assigned level:

The following is a summary of the tiered valuation input levels, as of October 31, 2012. The level assigned to the securities valuations may not be an indication of the risk or liquidity associated with investing in those securities. Because of the inherent uncertainties of valuation, the values reflected in the financial statements may materially differ from the value received upon actual sale of those investments.

NOTE 4—Expense Offset Arrangement(s)

The expense offset arrangements are comprised of transfer agency credits which result from balances in Demand Deposit Accounts (DDA) used by the transfer agent for clearing shareholder transactions. For the six months ended October 31, 2012, the Fund received credits from this arrangement, which resulted in the reduction of the Fund’s total expenses of $2,346.