Invesco DB Commodity Index Tracking Fund (DBC) 424B3Prospectus supplement

Filed Pursuant to Rule 424(b)(3)
Registration Nos. 333-233475

PROSPECTUS SUPPLEMENT NO. 2

(to Prospectus dated August 27, 2019)

INVESCO DB COMMODITY INDEX TRACKING FUND

86,000,000 Common Units of Beneficial Interest

This Prospectus Supplement No. 2 (“Supplement No. 2”) supplements and amends the Prospectus dated August 27, 2019 (the “Prospectus”), and supersedes and replaces Prospectus Supplement No. 1 dated April 7, 2020.

Effective immediately, the Prospectus is revised as follows:

Recent Risks Related to Investing in Oil Markets

As the impact of the 2020 pandemic-related price volatility passes through various sectors of the financial and commodity markets, unusual developments in the crude oil markets have occurred. The oil markets are characterized by extreme volatility, and have experienced volatile price swings recently. On April 20th, the last trading day before expiration of the NYMEX West Texas Intermediate (“WTI”) May 2020 crude oil futures contract, futures contract prices fell below zero to historic lows, with the May 2020 WTI futures contract trading as low as negative $37.63. As of the date of this Supplement No. 2 (and at the time the WTI May 2020 crude oil futures contract price fell to a negative level), the Fund invests in the WTI futures contract for March 2021. If that, or any other futures contract held by the Fund at a future date, were to reach a negative price, investors in the Fund could lose a significant portion of, or their entire, investment.

In addition to the risks associated with the super contango market that occurred in April of 2020 (described below), the generally-unprecedented market conditions spurred by the 2020 pandemic have heightened certain risks associated with investment in commodity markets generally, as well as investment in the Fund specifically. Accordingly, investors should consider each of the following “recent risks” carefully, as well as the more “general” risks described elsewhere below, when considering an investment in the Fund.

Inadequate Oil Storage Capacity Affects the Futures Market.

In April of 2020, the collapse of demand for fuel following government restrictions on travel created an oversupply of crude oil production that rapidly filled most available oil storage facilities. Market participants who contractually promised to buy and take delivery of crude oil found themselves with nowhere to store the crude oil and at risk of default under the terms of the May 2020 WTI futures contract. The scarcity in storage was widespread, and some market participants took the extreme measure of selling their futures contracts at a negative price (effectively paying another market participant to take their crude oil). As a result, for the first time in history, crude oil futures contracts traded below zero.

Oversupply of oil may continue, impacting futures contracts of additional delivery months. Such circumstances may arise due to: (i) disruptions in oil pipelines and other means to get oil out of storage and delivered to refineries (as might occur due to infrastructure deterioration, work stoppages, or weather/disaster); (ii) investor demand for futures contracts as an investment opportunity driving increased production; or (iii) potential U.S. government intervention (in the form of grants or other aid) to keep oil producers, and the workers they employ, in service.

The economic impact of crude oil’s negative price is not fully known at this time and it is not certain whether crude oil will trade at negative prices again in the future. The Fund may experience significant losses if it holds positions in futures contracts that trade at negative prices.

Trading Limitations Could Be Imposed on the Fund.

Market volatility and economic turbulence in the first half of 2020 has led to futures commission merchants increasing margin requirements for certain futures contracts, including nearer-dated WTI and other oil futures contracts. Some futures commission merchants may impose trading limitations, whether in the form of limits or prohibitions on trading oil futures contracts. If the Fund is subject to increased margin requirements, it will incur increased costs in achieving its investment objective. The Fund may not be able to achieve its investment objective if it becomes subject to heightened trading limitations.

Fund Closures and Trading Halts.

In light of the extraordinary market circumstances, other exchange traded products that provide its investors with exposure to oil have liquidated or halted issuing creation units. With less available investment options, the Fund may experience greater-than-normal investment activity. Such activity could disrupt the Fund’s Creation Unit process, as described more fully below. Additionally, outflows or liquidations in other commodity pooled investment vehicles may result downward price pressure on the related futures contracts as the commodity pools liquidate positions.

Risk that the Fund Will Experience Losses As a Result of Global Economic Shocks.

In March 2020, U.S. equity markets entered a bear market in the fastest such move in the history of U.S. financial markets. Economic turmoil continued into April 2020, with those in the United States who have requested unemployment benefits since the outbreak ofCOVID-19 reaching 26 million people as of the week ending April 18, 2020. In response toCOVID-19, the United States Congress has passed relief packages totaling more than $2.5 trillion, including $2 trillion of economic relief made available in the Coronavirus Aid, Relief, and Economic Security (CARES) Act. Although oil prices rallied during 2019 with higher prices supported by continued compliance with OPEC+ production cuts, US sanctions against Venezuela and Iran, tension in the Gulf region, and an oversupply of oil with inadequate storage capacity, prices fell to historic lows in April 2020. Contemporaneous with the onset of theCOVID-19 pandemic in the US, oil experienced shocks to supply and demand, impacting the price and volatility of oil. With the oversupply of oil, caused at least in part to theCOVID-19-driven significantly low demand, the oil market volatility continued through the end of April. The global economic shocks being experienced as of the date hereof may cause significant losses to the Fund.

The Effects of Super Contangoed Market Are More Exaggerated Than Rolling Futures Contracts In A Contangoed Market.

As described below, pursuant to the Index’s methodology, the Index Commodities roll from one futures contract to another futures contract that is intended to generate the most favorable ‘implied roll yield’ under prevailing market conditions, rather than rolling to a new futures contract based on a predetermined schedule (e.g., monthly). Where there is an upward-sloping price curve for futures contracts, the implied roll yield is expected to be negative, which is a market condition called “contango”. Contango exists when contract prices are higher in distant delivery months than in nearer delivery months, typically due to

costs associated with storing a given physical commodity for a longer period. Rolling in a contangoed market will tend to cause a drag on returns from futures trading. The Index’s selection of a new futures contract on the Index Commodities in such market conditions is designed to minimize the impact of negative roll yield.

Super contango exists when the futures contracts for the month next to occur (e.g., the June 2020 futures contract available in May 2020) trade significantly lower than futures contracts with delivery in later months. Super contango typically occurs when the inventory space available to store the physical commodity has significantly decreased as a result of excess supply, meaning that a futures contract’s cost of carry (e.g., the cost of storing a physical commodity) has increased. In April 2020, the WTI futures contract with a May 2020 delivery date entered super contango, resulting in significant losses for investors in this contract. The effects of rolling in a super contangoed market generally are more exaggerated than rolling in a contangoed market.

Risk that theCOVID-19 Pandemic Will Cause Economic Turmoil.

An outbreak of a novel and highly contagious form of coronavirus,COVID-19, has spread to many countries throughout the world including the United States. The World Health Organization has declared the outbreak to be a public health emergency of international concern, and the U.S. Health and Human Services Secretary has declared it a public health emergency in the United States.

The impact of the outbreak ofCOVID-19 has been extensive in many aspects of society. The outbreak has resulted in numerous deaths, adversely impacted global commercial activity, and led to significant uncertainty and disruptions in the global financial markets and the economies of nations where the coronavirus disease has arisen. Many countries have reacted by instituting quarantines, prohibitions on travel and the closure of offices, businesses, schools, retail stores and other public venues. Businesses are also implementing similar precautionary measures. Such measures, as well as the general uncertainty surrounding the dangers and impact ofCOVID-19, are creating significant disruption in supply chains and economic activity. Consumer, corporate and financial confidence is being materially adversely affected by this outbreak. Such erosion of confidence may lead to or extend to a localized or global economic downturn. Such health crisis could exacerbate political, social, and economic risks and result in significant breakdowns, delays, and other disruptions to the economy, with potential corresponding results on the performance of the Fund and its investments.

This outbreak ofCOVID-19 (and any future outbreaks of any other epidemics or pandemics) has led (and may continue to lead) to significant uncertainty, breakdowns delays and other disruptions in the global financial markets and the economies of nations where theCOVID-19 has arisen and may in the future arise, and may result in adverse impacts on the global economy in general, with potential corresponding results on the performance of the Fund. The global impact of this outbreak is rapidly evolving, and it is impossible to predict the scope of this outbreak or the impact it may have on the global economy or the global financial markets. TheCOVID-19 outbreak has already led to certain governmental interventions that were implemented on an “emergency” basis, suddenly and substantially eliminating market participants’ ability to continue to implement certain strategies or manage the risk of their outstanding positions. No assurances can be made regarding the policies that may be adopted by the Federal Reserve, the federal government (including regulatory agencies), any state government, or any foreign government as a result of the outbreak or market volatility. In response to theCOVID-19 outbreak, most of the Managing Partner’s personnel is working remotely and travel is restricted. Although the Managing Partner has implemented its business continuity plan to permit personnel to effectively work remotely, there is no assurance that this will work effectively at all times.

This outbreak ofCOVID-19, or any future epidemic or pandemic similar toCOVID-19, SARS, H1N1/09 flu or MERS, could have a significant adverse impact on the Fund and its investments, could adversely affect the Fund’s ability to fulfill its investment objectives, and could result in significant losses to the Fund. The extent of the impact of any outbreak on the performance of the Fund and its investments depend on many factors, including the duration and scope of such outbreak, the development and distribution of treatments and vaccines for viruses such asCOVID-19, the extent of its disruption to

important global, regional and local supply chains and economic markets, and the impact of such outbreak on overall supply and demand, investor liquidity, consumer confidence and levels of economic activity, all of which are highly uncertain and cannot be predicted.

An Unanticipated Number of Creation Requests During a Short Period of Time Could Result in a Shortage of Shares.

The Managing Owner continuously evaluates whether the amount of Shares registered and available to meet Creation Unit orders remains adequate. However, if the Managing Owner receives a substantial number of requests for Creation Units during a relatively short period of time that substantially differ from typical creation volumes, as a result of market volatility or otherwise (including during a pandemic such asCOVID-19), the Fund may not have sufficient Shares outstanding to satisfy demand and Authorized Participants may, therefore, be unable to purchase additional Creation Units. In such instances, demand for Shares on the Exchange may exceed the supply available, due to Authorized Participants being unable to meet such demand by purchasing new Shares from the Fund. As a result, Shares may trade at premium to the NAV per share of the Fund.

Futures contract prices have a high degree of volatility and are subject to rapid and substantial changes. Consequently, there is a risk that the value of your investment in the Fund could decrease significantly due to rapid and substantial changes in the prices of futures contracts held by the Fund. The Index’s average annual volatility since inception is 15.41% . Average annual volatility is the average of the Index’s volatility each year since its inception. Yearly volatility is the relative rate at which the price of the Index moves up and down, found by calculating the annualized standard deviation of the daily change in price for each business day in the given year. However, annual volatility should not be interpreted as the most-likely outcome. As demonstrated during the unprecedented market conditions of the first half of 2020, volatility in certain futures contracts may spike significantly during periods of global economic and social stress. At such times, if the Fund holds a futures contract that experiences the full impact of such market stresses, the volatility of its investments could greatly surpass the Index’s annual volatility since inception.

In addition, the Fund enters sell orders with the Commodity Broker from time to time, to liquidate Index Contract positions in order to satisfy redemption requests or to pay expenses and liabilities. The Fund is subject to the risk that temporary aberrations or distortions will occur in the market for Index Contracts at the time those orders are executed. The prices received by the Fund from the liquidation of its positions could be adversely affected, which in turn could adversely affect the value of the Shares. Those aberrations or distortions may result from trading activities by other market participants or actions taken by the Commodity Broker, the CFTC, the exchanges or other regulatory authorities. If the Fund’s positions are liquidated at inopportune times

Further, in periods of heightened volatility, the bid and ask “spread” for purchasing shares of the Fund typically widen. Accordingly, an investor’s return on investment may be negatively impacted when transacted in Shares.

If one or more Authorized Participants withdraws from participation, it may become more difficult to create or redeem Creation Units, which may reduce the liquidity of the Shares. Such circumstances may be more pronounced in market conditions that increase volatility. If it becomes more difficult to create or redeem Creation Units, the correlation between the price of the Shares and the NAV may be affected, which may affect the trading market for the Shares. Having fewer participants in the market for the Shares could also adversely affect the ability to arbitrage any price difference between futures contracts and the Shares, which may also affect the trading market and liquidity of the Shares.

Margin Requirements and Risk Limits for Futures Contracts may Limit the Fund’s Ability to Achieve Sufficient Exposure and Prevent the Fund from Achieving its Investment Objective

“Initial” or “original” margin is the minimum amount of funds that must be deposited by a futures trader with his commodity broker in order to initiate futures trading or to maintain an open position in futures contracts. “Maintenance” margin is the amount (generally less than initial margin) to which a trader’s account may decline before he must deliver additional margin. A margin deposit is like a cash performance bond. It helps assure the futures trader’s performance of the futures contract that the trader purchases or sells. Futures contracts are customarily bought and sold on margin that represents a very small percentage (ranging upward from less than 2%) of the purchase price of the underlying commodity being traded. Because of such low margins, price fluctuations occurring in the futures markets may create profits and losses that are greater, in relation to the amount invested, than are customary in other forms of investments. The minimum amount of margin required in connection with a particular futures contract is set from time to time by the exchange on which such contract is traded, and may be modified from time to time by the exchange during the term of the contract. With respect to the Managing Owner’s trading, only the Managing Owner, and not the Fund or its Shareholders personally, will be subject to margin calls.

Brokerage firms carrying accounts for traders in futures contracts may not accept lower, and generally require higher, amounts of margin as a matter of policy in order to afford further protection for themselves.

An FCM may compute margin requirements multiple times per day and must do so at least once per day. When the Fund has an open futures contract position, it is subject to daily variation margin calls by an FCM that could be substantial in the event of adverse price movements. Because futures contracts require only a small initial investment in the form of a deposit or initial margin, they involve a high degree of leverage. A Fund with open positions is subject to maintenance or variation margin on its open positions. When the market value of a particular open futures contract position changes to a point where the margin on deposit does not satisfy maintenance margin requirements, a margin call is made by the FCM. If the margin call is not met within a reasonable time, the FCM may close out the Fund’s position, which may result in reduced returns to the Fund’s investors or impair the Fund from achieving its investment objective. If the Fund has insufficient cash to meet daily variation margin requirements, it may need to sell assets at a time when doing so is disadvantageous. Futures markets are highly volatile in general, and may become more volatile during periods of market or economic volatility, and the use of or exposure to futures contracts may increase volatility of the Fund’s NAV.

In addition, an FCM may impose margin requirements in addition to those imposed by the clearinghouse. Margin requirements are subject to change on any given day, and may be raised in the future on a single day or on multiple or successive days by either or both of the clearinghouse and the FCM. High margin requirements could prevent the Fund from obtaining sufficient exposure to futures contracts and may adversely affect the Fund’s ability to achieve its investment objective. An FCM’s failure to return required margin to the Fund on a timely basis may cause the Fund to delay redemption settlement dates or restrict, postpone, or limit the right of redemption.

Futures contracts are subject to liquidity risk. An FCM may impose risk limits on the Fund, which restrict the amount of exposure to futures contracts that the Fund can obtain through the FCM. If the risk limits imposed by an FCM do not provide sufficient exposure, the Fund may not be able to achieve its investment objective.

Additionally, natural or environmental disasters, such as earthquakes, fires, floods, hurricanes, tsunamis and other severe weather-related phenomena generally, and widespread disease, including pandemics and epidemics, have been and may be highly disruptive to economies and markets, adversely impacting individual companies, sectors, industries, markets, currencies, interest and inflation rates, credit ratings, investor sentiment, and other factors affecting the value of the Fund’s investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region are increasingly likely to adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any such events could have a significant adverse impact on the value of the Fund’s investments and could result in increased premiums or discounts to the Fund’s NAV. Additionally, the Fund rebalances its portfolio in accordance with the Index, and, therefore, any changes to the Index’s rebalance schedule will result in corresponding changes to the Fund’s rebalance schedule.

The Shares trade on the NYSE Arca under the symbol “DBC.”

Investing in the Shares involves significant risks. See“RISK FACTORS” starting on page 12 of the Prospectus.

These securities have not been approved or disapproved by the Securities and Exchange Commission or any state securities commission nor has the Securities and Exchange Commission passed upon the adequacy or accuracy of the Prospectus or this Prospectus Supplement No. 2. Any representation to the contrary is a criminal offense.

The Fund is not a mutual fund or any other type of investment company within the meaning of the Investment Company Act of 1940, as amended, and is not subject to regulation thereunder.

THE COMMODITY FUTURES TRADING COMMISSION HAS NOT PASSED UPON THE MERITS OF PARTICIPATING IN THIS POOL NOR HAS THE COMMISSION PASSED ON THE ADEQUACY OR ACCURACY OF THIS DISCLOSURE DOCUMENT.

The date of this Prospectus Supplement No. 2 is May 1, 2020.

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

P-DBC-PRO-1-SUP-2 050120