FCF SA2 10/18

SUPPLEMENT DATED OCTOBER 30, 2018

TO THE CURRENT STATEMENT OF ADDITIONAL INFORMATION

DATED FEBRUARY 1, 2018

OF

Franklin Income Fund

(a series of Franklin Custodian Funds)

The Statement of Additional Information (SAI) is amended as follows:

I.  The following replaces the ninth and sixteenth to eighteenth bullet points in the list of bullet points under the “Goals, Strategies and Risks – Additional Strategies – Income Fund” heading in the SAI:

The Fund may:

• engage in currency derivatives, such as currency forwards, currency futures, currency swaps and put and call options on currencies
• engage in equity-related derivatives and complex securities, such as buying and writing call and put options on securities and indices that trade on national securities exchanges and over-the-counter (OTC), buying and selling futures on equity securities and indexes and options on equity index futures, engaging in equity total return swaps and using equity-linked notes, including up to 2% of the Fund’s assets in equity-linked notes on commodity-linked ETFs
• engage in interest rate derivatives such as interest rate swaps and options thereon, interest rate/bond futures and options thereon, and inflation index swaps
• engage in credit-related derivatives and complex securities, including buying and selling single name, loan and index credit default swaps and options thereon, fixed income total return swaps, credit-linked notes, collateralized debt obligations

II.  The following is added to the “Goals, Strategies and Risks – Glossary of Investments, Techniques, Strategies and Their Risks” section of the SAI following the “Callable securities” sub-section:

Collateralized debt obligations     Collateralized debt obligations and similarly structured securities, sometimes known generally as CDOs, are interests in a trust or other special purpose entity (SPE) and are typically backed by a diversified pool of bonds, loans or other debt obligations. CDOs are not limited to investments in one type of debt and, accordingly, a CDO may be collateralized by corporate bonds, commercial loans, asset-backed securities, residential mortgage-backed securities, real estate investment trusts (REITs), commercial mortgage-backed securities, emerging market debt, and municipal bonds. Certain CDOs may use derivatives contracts, such as credit default swaps, to create “synthetic” exposure to assets rather than holding such assets directly, which entails the risks of derivative instruments described elsewhere in this SAI.

Common varieties of CDOs include the following:

Collateralized loan obligations.     Collateralized loan obligations (CLOs) are interests in a trust typically collateralized substantially by a pool of loans, which may include, among others, domestic and foreign senior secured loans, senior unsecured loans, and subordinate corporate loans made to domestic and foreign borrowers, including loans that may be rated below investment grade or equivalent unrated loans.

Collateralized bond obligations.     Collateralized bond obligations (CBOs) are interests in a trust typically backed substantially by a diversified pool of high risk, below investment grade fixed income securities.

Structured finance CDOs.     Structured finance CDOs are interests in a trust typically backed substantially by structured investment products such as asset-backed securities and commercial mortgage-backed securities.

Synthetic CDOs.     In contrast to CDOs that directly own the underlying debt obligations, referred to as cash CDOs, synthetic CDOs are typically collateralized substantially by derivatives contracts, such as credit default swaps, to create “synthetic” exposure to assets rather than holding such assets directly, which entails the risks of derivative instruments described elsewhere in this SAI, principally counterparty risk.

CDOs are similar in structure to collateralized mortgage obligations, described elsewhere in this SAI. Unless the context indicates otherwise, the discussion of CDOs below also applies to CLOs, CBOs and other similarly structured securities.

In CDOs, the cash flows from the SPE are split into two or more portions, called tranches (or classes), that vary in risk and yield. The riskiest portion is the “equity” tranche which bears the first loss from defaults on the bonds or loans in the SPE and is intended to protect the other, more senior tranches from severe, and potentially unforeseen, defaults or delinquent collateral payments (though such protection is not complete). Because they may be partially protected from defaults, senior tranches from a CDO typically have higher ratings and lower yields than the underlying collateral securities held by the trust, and may be rated investment grade. Despite protection from the equity tranche, more senior tranches can experience, and may have experienced in the past, substantial losses due to actual defaults, increased sensitivity to defaults due to collateral default, downgrades of the underlying collateral by rating agencies, forced liquidation of a collateral pool due to a failure of coverage tests, disappearance of protecting tranches, market anticipation of defaults, as well as a market aversion to CDO securities as a class.

The risks of an investment in a CDO depend largely on the type of collateral held by the SPE and the tranche of the CDO in which the Fund invests. Investment risk may also be affected by the performance of a CDO’s collateral manager (the entity responsible for selecting and managing the pool of collateral securities held by the SPE trust), especially during periods of market volatility. Normally, CDOs are privately offered and sold, and thus, are not registered under the securities laws and traded in a public market. As a result, investments in CDOs may be characterized by the Fund as illiquid securities. However, an active dealer market may exist for CDOs allowing the Fund to trade CDOs with other qualified institutional investors under Rule 144A. To the extent such investments are characterized as illiquid, they will be subject to the Fund’s restrictions on investments in illiquid securities. The Fund’s investment in unregistered securities such as CDOs will not receive the same investor protection as an investment in registered securities.

All tranches of CDOs, including senior tranches with high credit ratings, can experience, and at times many have experienced, substantial losses due to actual defaults, increased sensitivity to future defaults due to the disappearance of protecting tranches, market anticipation of defaults, as well as market aversion to CDO securities as a class. In the past, prices of CDO tranches have declined considerably. The drop in prices was initially triggered by the subprime mortgage crisis. Subprime mortgages make up a significant portion of the mortgage securities that collateralize many CDOs. As floating interest rates and mortgage default rates increased, the rating agencies that had rated the mortgage securities and CDO transactions backed by such mortgages realized their default assumptions were too low and began to downgrade the credit rating of these transactions. There can be no assurance that additional losses of equal or greater magnitude will not occur in the future.

In addition to the normal risks associated with debt securities and asset backed securities (e.g., interest rate risk, credit risk and default risk) described elsewhere in this SAI, CDOs carry additional risks including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the quality of the collateral may decline in value or quality or go into default or be downgraded; (iii) the Fund may invest in tranches of a CDO that are subordinate to other classes; and (iv) the complex structure of the security may not be fully understood at the time of investment and may produce disputes with the issuer, difficulty in valuing the security or unexpected investment results.

Certain issuers of CDOs may be deemed to be “investment companies” as defined in the 1940 Act. As a result, the Fund’s investment in these structured investments from these issuers may be limited by the restrictions contained in the 1940 Act. CDOs generally charge management fees and administrative expenses that the shareholders of the Fund would pay indirectly.

III.  The following is added to the “Goals, Strategies and Risks – Glossary of Investments, Techniques, Strategies and Their Risks” section of the SAI following the “Corporate Loans, Assignments and Participations” sub-section:

Credit-linked notes     Credit-linked notes (CLNs) are typically set-up as a "pass-through" note structure created by a broker or bank as an alternative investment for funds or other purchasers to directly buying a bond or group of bonds. CLNs are typically issued at par, with a one to one relationship with the notional value to the underlying bond(s). The performance of the CLN, however, including maturity value, is linked to the performance of the specified underlying bond(s) as well as that of the issuing entity.

In addition to the risk of loss of its principal investment, the Fund bears the risk that the issuer of the CLN will default or become bankrupt. In such an event, the Fund may have difficulty being repaid, or fail to be repaid, the principal amount of its investment. A downgrade or impairment to the credit rating of the issuer will also likely impact negatively the price of the CLN, regardless of the price of the bond(s) underlying the CLNs. A CLN is typically structured as a limited recourse, unsecured obligation of the issuer of such security such that the security will usually be the obligation solely of the issuer and will not be an obligation or responsibility of any other person, including the issuer of the underlying bond(s).

Most CLNs are structured as Rule 144A securities so that they may be freely traded among institutional buyers. However, the market for CLNs may be, or suddenly can become, illiquid. The other parties to the transaction may be the only investors with sufficient understanding of the CLN to be interested in bidding for it. Changes in liquidity may result in significant, rapid and unpredictable changes in the prices of CLNs. In certain cases, a market price for a CLN may not be available or may not be reliable, and the Fund could experience difficulty in selling such security at a price the investment manager believes is fair.

IV.  The following is added to the “Goals, Strategies and Risks – Glossary of Investments, Techniques, Strategies and Their Risks” section of the SAI following the “Risks of futures contracts” sub-section:

Options on futures contracts.     Options on futures contracts trade on the same contract markets as the underlying futures contract. When the Fund buys an option, it pays a premium for the right, but does not have the obligation, to purchase (call) or sell (put) a futures contract at a set price (called the exercise price). The purchase of a call or put option on a futures contract, whereby the Fund has the right to purchase or sell, respectively, a particular futures contract, is similar in some respects to the purchase of a call or put option on an individual security or currency. Depending on the premium paid for the option compared to either the price of the futures contract upon which it is based or the price of the underlying reference instrument, the option may be less risky than direct ownership of the futures contract or the underlying reference instrument. For example, the Fund could purchase a call option on a long futures contract when seeking to hedge against an increase in the market value of the underlying reference instrument, such as appreciation in the value of a non-U.S. currency against the U.S. dollar.

The seller (writer) of an option becomes contractually obligated to take the opposite futures position if the buyer of the option exercises its rights to the futures position specified in the option. In return for the premium paid by the buyer, the seller assumes the risk of taking a possibly adverse futures position. In addition, the seller will be required to post and maintain initial and variation margin with the FCM. One goal of selling (writing) options on futures may be to receive the premium paid by the option buyer.

For more general information about the mechanics of purchasing and writing options, see "Options" below.

Risks of options on futures contracts.     The Fund’s use of options on futures contracts is subject to the risks related to derivative instruments generally. In addition, the amount of risk the Fund assumes when it purchases an option on a futures contract is the premium paid for the option plus related transaction costs. The purchase of an option also entails the risk that changes in the value of the underlying futures contract will not be fully reflected in the value of the option purchased. The seller (writer) of an option on a futures contract is subject to the risk of having to take a possibly adverse futures position if the purchaser of the option exercises its rights. If the seller were required to take such a position, it could bear substantial losses. An option writer has potentially unlimited economic risk because its potential loss, except to the extent offset by the premium received, is equal to the amount the option is “in-the-money” at the expiration date. A call option is in-the-money if the value of the underlying futures contract exceeds the exercise price of the option. A put option is in-the-money if the exercise price of the option exceeds the value of the underlying futures contract.

V.  The following is added to the “Goals, Strategies and Risks – Glossary of Investments, Techniques, Strategies and Their Risks” section of the SAI following the “Credit default swaps”  sub-section:

Currency swaps.   A currency swap is generally a contract between two parties to exchange one currency for another currency at the start of the contract and then exchange periodic floating or fixed rates during the term of the contract based upon the relative value differential between the two currencies. Unlike other types of swaps, currency swaps typically involve the delivery of the entire principal (notional) amounts of the two currencies at the time the swap is entered into. At the end of the swap contract, the parties receive back the principal amounts of the two currencies. In such a situation, the full notional value of a currency swap is subject to the risk that the other party to the swap will default on its contractual delivery obligations. The Fund may also enter into currency swaps on a net basis, which means the two different currency payment streams under the swap agreement are converted and netted out to a single cash payment in just one of the currencies.

For example, a currency swap may be used to hedge the interest payments and principal amount of a debt obligation that is denominated in a non-U.S. currency by entering into a cross currency swap whereby one party would make payments in the non-U.S. currency and receive payments in U.S. dollars. Or, a currency swap may be used to gain exposure to non-U.S. currencies and non-U.S. interest rates by making payments in U.S. dollars and receiving payments in non-U.S. currencies.

Because currency control is of great importance to the issuing governments and influences economic planning and policy, purchases and sales of currency and related instruments can be negatively affected by government exchange controls, blockages, and manipulations or exchange restrictions imposed by governments. These actions could result in losses to the Fund if it is unable to deliver or receive a specified currency or funds in settlement of obligations, including any derivative transaction obligations. These actions could also have an adverse effect on the Fund’s currency transactions or cause the Fund’s hedging positions to be rendered useless.

Interest rate swaps.   An interest rate swap is an agreement between two parties to exchange interest rate payment obligations. Typically, one party's obligation is based on an interest rate fixed to maturity while the other party's obligation is based on an interest rate that changes in accordance with changes in a designated benchmark (for example, the London Interbank Offered Rate (LIBOR), prime rate, commercial paper rate, or other benchmarks). Alternatively, both payment obligations may be based on an interest rate that changes in accordance with changes in a designated benchmark (also known as a “basis swap”). In a basis swap, the rates may be based on different benchmarks (for example, LIBOR versus commercial paper) or on different terms of the same benchmark (for example, one-month LIBOR versus three-month LIBOR). Each party’s payment obligation under an interest rate swap is determined by reference to a specified “notional” amount of money. Therefore, interest rate swaps generally do not involve the delivery of securities, other underlying instruments, or principal amounts; rather they entail the exchange of cash payments based on the application of the designated interest rates to the notional amount. Accordingly, barring swap counterparty or FCM default, the risk of loss in an interest rate swap is limited to the net amount of interest payments that the Fund is obligated to make or receive (as applicable), as well as any early termination payment payable by or to the Fund upon early termination of the swap.

By swapping fixed interest rate payments for floating payments, an interest rate swap can be used to increase or decrease the Fund's exposure to various interest rates, including to hedge interest rate risk. Interest rate swaps are generally used to permit the party seeking a floating rate obligation the opportunity to acquire such obligation at a rate lower than is directly available in the credit markets, while permitting the party desiring a fixed-rate obligation the opportunity to acquire such a fixed-rate obligation, also frequently at a rate lower than is directly available in the credit markets. The success of such a transaction depends in large part on the availability of fixed-rate obligations at interest (or coupon) rates low enough to cover the costs involved. Similarly, a basis swap can be used to increase or decrease the Fund's exposure to various interest rates, including to hedge against or speculate on the spread between the two indexes, or to manage duration. An interest rate swap transaction is affected by changes in interest rates, which, in turn, may affect the prepayment rate of any underlying debt obligations upon which the interest rate swap is based.

Inflation index swaps.   An inflation index swap is a contract between two parties, whereby one party makes payments based on the cumulative percentage increase in an index that serves as a measure of inflation (typically, the Consumer Price Index) and the other party makes a regular payment based on a compounded fixed rate. Each party’s payment obligation under the swap is determined by reference to a specified “notional” amount of money. Typically, an inflation index swap has payment obligations netted and exchanged upon maturity. The value of an inflation index swap is expected to change in response to changes in the rate of inflation. If inflation increases at a faster rate than anticipated at the time the swap is entered into, the swap will increase in value. Similarly, if inflation increases at a rate slower than anticipated at the time the swap is entered into, the swap will decrease in value.

Equity total return swaps.   An equity total return swap (also sometimes referred to as a synthetic equity swap or “contract for difference” when written with respect to an equity security or basket of equity securities) is an agreement between two parties under which the parties agree to make payments to each other so as to replicate the economic consequences that would apply had a purchase or short sale of the underlying reference instrument or index thereof taken place. For example, one party agrees to pay the other party the total return earned or realized on the notional amount of an underlying equity security and any dividends declared with respect to that equity security. In return the other party makes payments, typically at a floating rate, calculated based on the notional amount.

Fixed income total return swaps.   A fixed income total return swap is an agreement between two parties, pursuant to which one pays (and the other receives) an amount equal to the total return (including, typically, income and capital gains distributions, principal prepayment or credit losses) of an underlying reference asset (e.g., a note, bond or index) in exchange for a regular payment, at a floating rate based on LIBOR, or alternatively at a fixed rate or the total rate of return on another financial instrument. The Fund may take either position in a total return swap (i.e., the Fund may receive or pay the total return on the underlying reference asset). A fixed income total return swap may be written on many different kinds of underlying reference assets, and may include different indices for various kinds of debt securities (e.g., U.S. investment grade bonds, high yield bonds or emerging market bonds).

Options on swap agreements.   An option on a swap agreement generally is an OTC option (see the discussion above on OTC options) that gives the buyer of the option the right, but not the obligation, in return for payment of a premium to the seller, to enter into a previously negotiated swap agreement, or to extend, terminate or otherwise modify the terms of an existing swap agreement. The writer (seller) of an option on a swap agreement receives premium payments from the buyer and, in exchange, becomes obligated to enter into or modify an underlying swap agreement upon the exercise of the option by the buyer. When the Fund purchases an option on a swap agreement, it risks losing only the amount of the premium it has paid should it decide to let the option expire unexercised, plus any related transaction costs.

There can be no assurance that a liquid secondary market will exist for any particular option on a swap agreement, or at any particular time, and the Fund may have difficulty affecting closing transactions in particular options on swap agreements. Therefore, the Fund may have to exercise the options that it purchases in order to realize any profit and take delivery of the underlying swap agreement. The Fund could then incur transaction costs upon the sale or closing out of the underlying swap agreement. In the event that the option on a swap is exercised, the counterparty for such option would be the same counterparty with whom the Fund entered into the underlying swap.

However, if the Fund writes (sells) an option on a swap agreement, the Fund is bound by the terms of the underlying swap agreement upon exercise of the option by the buyer, which may result in losses to the Fund in excess of the premium it received. Options on swap agreements involve the risks associated with derivative instruments generally, as described above, as well as the additional risks associated with both options and swaps generally.

Options on swap agreements are considered to be swaps for purposes of CFTC regulation. Although they are traded OTC, the CFTC may in the future designate certain options on swaps as subject to mandatory clearing. For more information, see “Cleared swaps” and “Risks of cleared swaps.”

An option on an interest rate swap (also sometimes referred to as a “swaption”) is a contract that gives the purchaser the right, but not the obligation, in return for payment of a premium, to enter into a new interest rate swap. A pay fixed option on an interest rate swap gives the buyer the right to establish a position in an interest rate swap where the buyer will pay (and the writer will receive) the fixed-rate cash flows and receive (and the writer will pay) the floating-rate cash flows. In general, most options on interest rate swaps are “European” exercise, which means that they can only be exercised at the end of the option term. Depending on the movement of interest rates between the time of purchase and expiration, the value of the underlying interest rate swap and therefore also the value of the option on the interest rate swap will change.

An option on a credit default swap is a contract that gives the buyer the right (but not the obligation), in return for payment of a premium to the option seller, to enter into a new credit default swap on a reference entity at a predetermined spread on a future date. This spread is the price at which the contract is executed (the option strike price). Similar to a put option, in a payer option on a credit default swap, the option buyer pays a premium to the option seller for the right, but not the obligation, to buy credit protection on a reference entity (e.g., a particular portfolio security) at a predetermined spread on a future date. Similar to a call option, in a receiver option on a credit default swap the option buyer pays a premium for the right, but not the obligation to sell credit default swap protection on a reference entity or index. Depending on the movement of market spreads with respect to the particular referenced debt securities between the time of purchase and expiration of the option, the value of the underlying credit default swap and therefore the value of the option will change. Options on credit default swaps currently are traded OTC and the specific terms of each option on a credit default swap are negotiated directly with the counterparty.

An option on a total return swap is a contract that gives the buyer the right (but not the obligation), in return for payment of a premium to the option seller, to enter into a new total return swap on a reference asset at a predetermined spread on a future date. This spread is the price at which the contract is executed (the option strike price). Similar to a payer option on a credit default swap, in a payer option on a total return swap, the option buyer pays a premium to the option seller for the right, but not the obligation, to sell the return on a reference asset or index at a predetermined spread on a future date in return for a regular payment. Similar to a receiver option on a credit default swap, in a receiver option on a total return swap the option buyer pays a premium for the right, but not the obligation to receive the total return of the reference asset or index in return for a regular payment. Depending on the movement of market spreads with respect to the particular referenced asset or index between the time of purchase and expiration of the option, the value of the underlying total return swap and therefore the value of the option will change. Options on total return swaps currently are traded OTC and the specific terms of each option on a total return swap are negotiated directly with the counterparty.

Please keep this supplement with your SAI for future reference.