Supplement to the
Fidelity® Mega Cap Stock Fund
Class A, Class M, Class C, Class I and Class Z
August 29, 2019
Prospectus

The following information replaces similar information found in the “Fund Basics” section under the “Principal Investment Risks” heading.

Many factors affect the fund's performance. Developments that disrupt global economies and financial markets, such as pandemics and epidemics, may magnify factors that affect the fund’s performance. The fund's share price changes daily based on changes in market conditions and interest rates and in response to other economic, political, or financial developments. The fund's reaction to these developments will be affected by the types of securities in which the fund invests, the financial condition, industry and economic sector, and geographic location of an issuer, and the fund's level of investment in the securities of that issuer. When you sell your shares they may be worth more or less than what you paid for them, which means that you could lose money by investing in the fund.

The following information replaces similar information found in the “Fund Services” section under the “Fund Distribution” heading.

The CDSC may be waived on the redemption of shares (applies to Class A, Class M, and Class C, unless otherwise noted):

For disability or death.
From employer-sponsored retirement plans (except SIMPLE IRAs, SEPs, and SARSEPs) in accordance with required minimum distributions as mandated by the Internal Revenue Code and related regulations.
For required minimum distributions from Traditional IRAs, Rollover IRAs, SIMPLE IRAs, SEPs, and SARSEPs (excludes Roth accounts) as mandated by the Internal Revenue Code and related regulations.
Through the Fidelity Advisor^® Systematic Withdrawal Program, if the amount does not exceed 12% of the account balance in a rolling 12-month period.
(Applicable to Class A and Class M only) Held by insurance company separate accounts.
(Applicable to Class A and Class M only) From an employee benefit plan (except SIMPLE IRAs, SEPs, SARSEPs, and plans covering self-employed individuals and their employees) or 403(b) programs (except Fidelity Advisor^® 403(b) programs for which Fidelity or an affiliate serves as custodian).
(Applicable to Class A and Class M only) On which a finder's fee was eligible to be paid to an investment professional at the time of purchase, but was not paid because payment was declined (to determine your eligibility for this CDSC waiver, please ask your investment professional if he or she received a finder's fee at the time of purchase).
(Applicable to Class C only) On which investment professionals did not receive a concession at the time of purchase.

The following information replaces similar information found in the “Appendix” section under the "Sales Charge Waiver Policies Applied by Certain Intermediaries" heading.

Sales Charge Waiver Policies Applied by Certain Intermediaries

Ameriprise

The following information applies to Class A shares purchases if you have an account with or otherwise purchase fund shares through Ameriprise Financial:

Shareholders purchasing fund shares through an Ameriprise Financial platform or account are eligible for the following front-end sales charge waivers and discounts, which may differ from those disclosed elsewhere in this prospectus or SAI.

Class A Shares Front-End Sales Charge Waivers Available at Ameriprise Financial:

• Employer-sponsored retirement plans (e.g., 401(k) plans, 457 plans, employer-sponsored 403(b) plans, profit sharing and money purchase pension plans and defined benefit plans). For purposes of this provision, employer-sponsored retirement plans do not include SEP IRAs, Simple IRAs or SAR-SEPs

• Shares purchased through an Ameriprise Financial investment advisory program (if an Advisory or similar share class for such investment advisory program is not available)

• Shares purchased by third party investment advisors on behalf of their advisory clients through Ameriprise Financial's platform (if an Advisory or similar share class for such investment advisory program is not available)

• Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the same fund family)

• Shares exchanged from Class C shares of the same fund in the month of or following the 10-year anniversary of the purchase date. To the extent that this prospectus elsewhere provides for a waiver with respect to such shares following a shorter holding period, that waiver will apply to exchanges following such shorter period. To the extent that this prospectus elsewhere provides for a waiver with respect to exchanges of Class C shares for load waived shares, that waiver will also apply to such exchanges

• Employees and registered representatives of Ameriprise Financial or its affiliates and their immediate family members

• Shares purchased by or through qualified accounts (including IRAs, Coverdell Education Savings Accounts, 401(k)s, 403(b) TSCAs subject to ERISA and defined benefit plans) that are held by a covered family member, defined as an Ameriprise financial advisor and/or the advisor's spouse, advisor's lineal ascendant (mother, father, grandmother, grandfather, great grandmother, great grandfather), advisor's lineal descendant (son, step-son, daughter, step-daughter, grandson, granddaughter, great grandson, great granddaughter) or any spouse of a covered family member who is a lineal descendant

• Shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (i.e., Rights of Reinstatement)

Edward D. Jones & Co. (Edward Jones)

Sales Waivers and Reductions in Sales Charges:

Effective on or after May 1, 2020, clients of Edward Jones (also referred to as "shareholders") purchasing fund shares on the Edward Jones commission and fee-based platforms are eligible only for the following sales charge discounts (also referred to as "breakpoints") and waivers, which can differ from breakpoints and waivers described elsewhere in the mutual fund prospectus or SAI or through another broker-dealer. In all instances, it is the shareholder's responsibility to inform Edward Jones at the time of purchase of any relationship, holdings of the fund family or other facts qualifying the purchaser for breakpoints or waivers. Edward Jones can ask for documentation of such circumstance.

Breakpoints

Rights of Accumulation (ROA):

• The applicable sales charge on a purchase of Class A shares is determined by taking into account all share classes (except any money market funds and retirement plan share classes) of the mutual fund family held by the shareholder or in an account grouped by Edward Jones with other accounts for the purpose of providing certain pricing considerations ("pricing groups"). This includes all share classes held on the Edward Jones platform and/or held on another platform. The inclusion of eligible fund family assets in the rights of accumulation calculation is dependent on the shareholder notifying his or her financial advisor of such assets at the time of calculation.

• ROA is determined by calculating the higher of cost or market value (current shares x NAV).

Letter of Intent (LOI):

• Through a LOI, shareholders can receive the sales charge and breakpoint discounts for purchases shareholders intend to make over a 13-month period from the date Edward Jones receives the LOI. The LOI is determined by calculating the higher of cost or market value of qualifying holdings at LOI initiation in combination with the value that the shareholder intends to buy over a 13-month period to calculate the front-end sales charge and any breakpoint discounts. Each purchase the shareholder makes during that 13-month period will receive the sales charge and breakpoint discount that applies to the total amount. The inclusion of eligible fund family assets in the LOI calculation is dependent on the shareholder notifying his or her financial advisor of such assets at the time of calculation. Purchases made before the LOI is received by Edward Jones are not covered under the LOI and will not reduce the sales charge previously paid. Sales charges will be adjusted if LOI is not met.

Sales Charge Waivers:

Sales charges are waived for the following shareholders and in the following situations:

• Associates of Edward Jones and its affiliates and their family members who are in the same pricing group (as determined by Edward Jones under its policies and procedures) as the associate. This waiver will continue for the remainder of the associate's life if the associate retires from Edward Jones in good-standing.

• Shares purchased in an Edward Jones fee-based program.

• Shares purchased through reinvestment of capital gains distributions and dividend reinvestment.

• Shares purchased from the proceeds of redeemed shares of the same fund family so long as the following conditions are met: 1) the proceeds are from the sale of shares within 60 days of the purchase, and 2) the sale and purchase are made in the same share class and the same account or the purchase is made in an individual retirement account with proceeds from liquidations in a non-retirement account.

• Shares exchanged into Class A shares from another share class so long as the exchange is into the same fund and was initiated at the discretion of Edward Jones. Edward Jones is responsible for any remaining contingent deferred sales charge (CDSC) due to the fund company, if applicable. Any future purchases are subject to the applicable sales charge as disclosed in the prospectus.

• Exchanges from Class C shares to Class A shares of the same fund, generally, in the 84th month following the anniversary of the purchase date or earlier at the discretion of Edward Jones.

CDSC Waivers:

If the shareholder purchases shares that are subject to a CDSC and those shares are redeemed before the CDSC is expired, the shareholder is responsible to pay the CDSC except in the following conditions:

• The death or disability of the shareholder

• Systematic withdrawals with up to 10% per year of the account value

• Return of excess contributions from an Individual Retirement Account (IRA)

• Shares sold as part of a required minimum distribution for IRA and retirement accounts if the redemption is taken in or after the year the shareholder reaches qualified age based on applicable IRS regulations

• Shares sold to pay Edward Jones fees or costs in such cases where the transaction is initiated by Edward Jones

• Shares exchanged in an Edward Jones fee-based program

• Shares acquired through NAV reinstatement

Other Important Information

1.1 Minimum Purchase Amounts:

• $250 initial purchase minimum

• $50 subsequent purchase minimum

1.2 Minimum Balances:

Edward Jones has the right to redeem at its discretion fund holdings with a balance of $250 or less. The following are examples of accounts that are not included in this policy:

• A fee-based account held on an Edward Jones platform

• A 529 account held on an Edward Jones platform

• An account with an active systematic investment plan or letter of intent (LOI)

1.3 Changing Share Classes:

• At any time it deems necessary, Edward Jones has the authority to exchange at NAV a shareholder's holdings in a fund to Class A shares of the same fund.

Janney Montgomery Scott LLC (Janney)

Effective May 1, 2020, if you purchase fund shares through a Janney brokerage account, you will be eligible for the following load waivers (front-end sales charge waivers and CDSC waivers) and discounts, which may differ from those disclosed elsewhere in a fund’s prospectus or SAI.

Front-end sales charge* waivers on Class A shares available at Janney:

• Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the fund family).

• Shares purchased by employees and registered representatives of Janney or its affiliates and their family members as designated by Janney.

• Shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within ninety (90) days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (i.e., right of reinstatement).

• Shares acquired through a right of reinstatement.

• Class C shares that are no longer subject to a CDSC and are converted to Class A shares of the same fund pursuant to Janney’s policies and procedures.

CDSC waivers on Class A and C shares available at Janney:

• Shares sold upon the death or disability of the shareholder.

• Shares sold as part of a systematic withdrawal plan as described in the fund's prospectus.

• Shares sold in connection with a return of excess contributions from an IRA account.

• Shares sold to pay Janney fees but only if the transaction is initiated by Janney.

• Shares acquired through a right of reinstatement.

• Shares exchanged into the same share class of a different fund.

Front-end sales charge* discounts available at Janney: breakpoints, rights of accumulation, and/or letters of intent:

• Breakpoints as described in the fund's prospectus.

• Rights of accumulation (ROA), which entitle shareholders to breakpoint discounts, will be automatically calculated based on the aggregated holding of fund family assets held by accounts within the purchaser’s household at Janney. Eligible fund family assets not held at Janney may be included in the ROA calculation only if the shareholder notifies his or her financial advisor about such assets.

• Letters of intent which allow for breakpoint discounts based on anticipated purchases within a fund family, over a 13-month time period. Eligible fund family assets not held at Janney Montgomery Scott may be included in the calculation of letters of intent only if the shareholder notifies his or her financial advisor about such assets.

*Also referred to as an “initial sales charge.”

Merrill Lynch

Effective May 1, 2020, shareholders purchasing fund shares through a Merrill Lynch platform or account are eligible only for the following load waivers (front-end sales charge waivers and CDSC, or back-end, waivers) and discounts, which may differ from those disclosed elsewhere in this prospectus or SAI.

Front-end Sales Load Waivers on Class A Shares Available at Merrill Lynch:

• Employer-sponsored retirement, deferred compensation and employee benefit plans (including health savings accounts) and trusts used to fund those plans, provided that the shares are not held in a commission-based brokerage account and shares are held for the benefit of the plan

• Shares purchased by a 529 Plan (does not include 529 Plan units or 529-specific share classes or equivalents)

• Shares purchased through a Merrill Lynch affiliated investment advisory program

• Shares exchanged due to the holdings moving from a Merrill Lynch affiliated investment advisory program to a Merrill Lynch brokerage (non-advisory) account pursuant to Merrill Lynch’s policies relating to sales load discounts and waivers

• Shares purchased by third party investment advisors on behalf of their advisory clients through Merrill Lynch's platform

• Shares of funds purchased through the Merrill Edge Self-Directed platform (if applicable)

• Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the fund family)

• Shares exchanged from Class C (i.e., level-load) shares of the same fund pursuant to Merrill Lynch's policies relating to sales load discounts and waivers

• Employees and registered representatives of Merrill Lynch or its affiliates and their family members

• Directors or Trustees of the fund, and employees of the fund's investment adviser or any of its affiliates, as described in this prospectus

• Eligible shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (known as Rights of Reinstatement). Automated transactions (i.e. systematic purchases and withdrawals) and purchases made after shares are automatically sold to pay Merrill Lynch’s account maintenance fees are not eligible for reinstatement

CDSC Waivers on A, B, and C Shares Available at Merrill Lynch:

• Death or disability of the shareholder

• Shares sold as part of a systematic withdrawal plan as described in the fund's prospectus

• Return of excess contributions from an IRA Account

• Shares sold as part of a required minimum distribution for IRA and retirement accounts pursuant to the Internal Revenue Code

• Shares sold to pay Merrill Lynch fees but only if the transaction is initiated by Merrill Lynch

• Shares acquired through a right of reinstatement

• Shares held in retirement brokerage accounts, that are exchanged for a lower cost share class due to transfer to certain fee based accounts or platforms (applicable to A and C shares only)

• Shares received through an exchange due to the holdings moving from a Merrill Lynch affiliated investment advisory program to a Merrill Lynch brokerage (non-advisory) account pursuant to Merrill Lynch’s policies relating to sales load discounts and waivers

Front-end Load Discounts Available at Merrill Lynch: Breakpoints, Rights of Accumulation & Letters of Intent

• Breakpoints as described in this prospectus

• Rights of Accumulation (ROA) which entitle shareholders to breakpoint discounts as described in the fund's prospectus will be automatically calculated based on the aggregated holding of fund family assets held by accounts (including 529 program holdings, where applicable) within the purchaser's household at Merrill Lynch. Eligible fund family assets not held at Merrill Lynch may be included in the ROA calculation only if the shareholder notifies his or her financial advisor about such assets

• Letters of Intent (LOI) which allow for breakpoint discounts based on anticipated purchases within a fund family, through Merrill Lynch, over a 13-month period of time (if applicable)

Morgan Stanley

Effective May 1, 2020, shareholders purchasing fund shares through a Morgan Stanley Wealth Management transactional brokerage account are eligible only for the following front-end sales charge waivers with respect to Class A shares, which may differ from and may be more limited than those disclosed elsewhere in this prospectus or SAI.

Front-end Sales Charge Waivers on Class A Shares Available at Morgan Stanley Wealth Management:

• Morgan Stanley employee and employee-related accounts according to Morgan Stanley's account linking rules

• Shares purchased through reinvestment of dividends and capital gains distributions when purchasing shares of the same fund

• Shares purchased through a Morgan Stanley self-directed brokerage account

• Class C (i.e., level-load) shares that are no longer subject to a contingent deferred sales charge and are converted to Class A shares of the same fund pursuant to Morgan Stanley Wealth Management's share class conversion program

• Your financial intermediary, on your behalf, can also convert Class M shares to Class A shares of the same fund, without a sales charge and on a tax free basis, if they are held in a brokerage account.

Oppenheimer & Co. (OPCO)

Effective May 1, 2020, shareholders purchasing fund shares through an OPCO platform or account are eligible only for the following load waivers (front-end sales charge waivers and CDSC waivers) and discounts, which may differ from those disclosed elsewhere in a fund's prospectus or SAI.

Front-end Sales Load Waivers on Class A Shares available at OPCO:

• Shares purchased by or through a 529 Plan

• Shares purchased through an OPCO affiliated investment advisory program

• Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the fund family)

• A shareholder in the fund’s Class C shares will have their shares converted at net asset value to Class A shares (or the appropriate share class) of the fund if the shares are no longer subject to a CDSC and the conversion is in line with the policies and procedures of OPCO

• Employees and registered representatives of OPCO or its affiliates and their family members

• Directors or Trustees of the fund, and employees of the fund's investment adviser or any of its affiliates, as described in this prospectus

CDSC Waivers on A, B and C Shares available at OPCO:

• Death or disability of the shareholder

• Shares sold as part of a systematic withdrawal plan as described in the fund's prospectus

• Return of excess contributions from an IRA Account

• Shares sold as part of a required minimum distribution for IRA and retirement accounts due to the shareholder reaching the qualified age based on applicable IRS regulations as described in the prospectus

• Shares sold to pay OPCO fees but only if the transaction is initiated by OPCO

• Shares acquired through a right of reinstatement

Front-end Load Discounts Available at OPCO: Breakpoints, Rights of Accumulation & Letters of Intent:

• Breakpoints as described in this prospectus.

• Rights of Accumulation (ROA) which entitle shareholders to breakpoint discounts will be automatically calculated based on the aggregated holding of fund family assets held by accounts within the purchaser's household at OPCO. Eligible fund family assets not held at OPCO may be included in the ROA calculation only if the shareholder notifies his or her financial advisor about such assets.

Raymond James & Associates, Inc., Raymond James Financial Services, Inc. and Each Entity's Affiliates (Raymond James)

Intermediary-Defined Sales Charge Waiver Policies:

The availability of certain initial or deferred sales charge waivers and discounts may depend on the particular financial intermediary or type of account through which you purchase or hold fund shares. Intermediaries may have different policies and procedures regarding the availability of front-end sales load waivers or CDSC waivers, which are discussed below. In all instances, it is the purchaser's responsibility to notify the fund or the purchaser's financial intermediary at the time of purchase of any relationship or other facts qualifying the purchaser for sales charge waivers or discounts. For waivers and discounts not available through a particular intermediary, shareholders will have to purchase fund shares directly from the fund or through another intermediary to receive these waivers or discounts.

Effective May 1, 2020, shareholders purchasing fund shares through a Raymond James platform or account, or through an introducing broker-dealer or independent registered investment adviser for which Raymond James provides trade execution, clearance, and/or custody services, will be eligible only for the following load waivers (front-end sales charge waivers and CDSC waivers) and discounts, which may differ from those disclosed elsewhere in a fund's prospectus or SAI.

Front-end sales load waivers on Class A shares available at Raymond James:

• Shares purchased in an investment advisory program.

• Shares purchased within the same fund family through a systematic reinvestment of capital gains and dividend distributions.

• Employees and registered representatives of Raymond James or its affiliates and their family members as designated by Raymond James.

• A shareholder in the fund's Class C shares will have their shares converted at net asset value per share (NAV) to Class A shares (or the appropriate share class) of the fund if the shares are no longer subject to a CDSC and the conversion is in line with the policies and procedures of Raymond James.

CDSC Waivers on Classes A, B and C shares available at Raymond James:

• Death or disability of the shareholder.

• Shares sold as part of a systematic withdrawal plan as described in the fund's prospectus.

• Return of excess contributions from an IRA Account.

• Shares sold to pay Raymond James fees but only if the transaction is initiated by Raymond James.

• Shares acquired through a right of reinstatement.

Front-end load discounts available at Raymond James: breakpoints, rights of accumulation, and/or letters of intent:

• Breakpoints as described in this prospectus.

• Rights of accumulation which entitle shareholders to breakpoint discounts will be automatically calculated based on the aggregated holding of fund family assets held by accounts within the purchaser's household at Raymond James. Eligible fund family assets not held at Raymond James may be included in the calculation of rights of accumulation only if the shareholder notifies his or her financial advisor about such assets.

• Letters of intent which allow for breakpoint discounts based on anticipated purchases within a fund family, over a 13-month time period. Eligible fund family assets not held at Raymond James may be included in the calculation of letters of intent only if the shareholder notifies his or her financial advisor about such assets.

AGII-20-01
1.885801.121

May 1, 2020