Deposit Date: Feb. 7, 20191 Unit Trusts Symbol: HIGT37 Investment Grade Corporate Trust, 5-8 Year, Series 37

WhyInvestment investment Grade grade Municipal intermediate trust, Intermediate bonds? Series (IGIN) Anticipated deposit information1 –– Provides an allocation to taxable bonds (corporates) rated investment grade or Offer price on day of deposit Approx. $1,040 higher as of deposit date. Par value per unit2 $1,000 –– Investment grade corporates with shorter maturities may help reduce interest Quality grade Investment grade rate risk for investors as well as add diversification benefits. or higher –– Timely for investors looking for additional potential income in this low interest Est. duration 4.5–6 years rate environment while managing duration risk. Sales charge 2.50% Average maturity of bonds 5.5-6.9 years –– May be appropriate for tax-deferred accounts such as IRAs and Keoghs. in portfolio Call protection of bonds in trust3 Approx. 6 years

Estimated ratings breakdown (%)1 WhyInvestment Grade unit Municipal trusts? trust, Intermediate Series (IGIN)

AA+ 0-20 Quality focus AA 0-20 Focus on investment grade bonds, specializing in quality taxable securities. AA- 0-20 A+ 0-20 Diversified and defined A 0-20 Actively selected and professionally monitored portfolio of diversified bonds. Investors know what they own in a defined investment. A- 0-20 BBB+ 5-30 Potential for consistent cash flow BBB 5-50 Historically consistent monthly income distributions for better client experience. BBB- 15-75 BB+ 0-10 Known dollar value2 BB 0-10 Consistent initial par value of $1,000 per unit, similar to individual bonds. BB- 0-10

WhyInvestment Invesco Gradeunit trusts? Municipal trust, Intermediate Series (IGIN)

Invest with a leader4 Invesco helped to bring the first fixed income to market, and has been delivering quality research-driven fixed income products for nearly four decades. –– Over 5,400. Fixed income unit trusts portfolios since 1976. –– $46 billion. Initial deposits as of Dec. 31, 2018. –– $21 billion. Income paid out to unitholders.

Contact your Invesco Unit Trust Sales Team National Wirehouse Division: 24-Hour Pricing Line: 800 998 4246 800 953 6785

Celebrating 40+ years in 1 This trust has not yet been deposited. The following information is based upon the currently anticipated unit trusts portfolio which is subject to change. Please review the final trust prospectus, when available, for actual portfolio information. About risk There is no assurance that a unit will achieve its investment objective. An investment in this unit trust is subject to market risk, which is the possibility that the market values of securities owned by the trust will decline and that the value of trust units may therefore be less than what your clients paid for them. This trust is unmanaged. Accordingly, your clients can lose money investing in this trust. An investment in the trust should be made with an understanding of the risks associated therewith, such as the inability of the issuer to pay the principal of or interest on a when due, volatile interest rates, early call provisions and changes to the tax status of the bonds. The actual trust portfolios may be concentrated in certain types of bond issues. To the extent an actual portfolio does so, it is more susceptible to economic, political, regulatory and other occurrences influencing those types of issuers. Investments in a trust may be subject to interest rate risk. If interest rates rise, the value of the bonds in a trust may decline and if interest rates decline the value of the bonds may increase. Also, the longer the period to maturity, the greater the sensitivity to interest rate changes tends to be. The financial markets, including those for corporate bonds, have recently experienced periods of extreme illiquidity and volatility. Due to these significant difficulties in the financial markets, there can be substantial uncertainty in assessing the value of an issuer’s assets or the extent of its obligations. For these or other reasons, the ratings of the bonds in the Trust’s portfolio may not accurately reflect the current financial condition or prospects of the issuer of the bond. Although the underlying securities in the portfolio are rated at or above the minimum credit quality as of the date of deposit, the ratings may change after inclusion in the trust. A portfolio concentrated in a single market sector may present more risk than a portfolio broadly diversified over several sectors.

2 On initial deposit, Invesco prices fixed income trust units based upon a $1,000 principal amount of bonds per unit. Subsequently, bonds may be sold to meet redemptions, to pay expenses, and in other limited circumstances. The sale of bonds will affect the principal amount of bonds included in the trust and as a result the principal amount of bonds per unit. There can be no assurance that a unitholder will receive this par value per unit subsequent to the deposit date. 3 Call protection generally prevents the issuer of a bond from redeeming the securities for a set number of years. With the exception of certain extraordinary calls, the bond issues selected for this trust will be non-callable for approximately the number of years listed above. Bonds may be called or sold, at or below par value. 4 As of Dec. 31, 2018 through Invesco Unit Investment Trusts and predecessor firms.

A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations, including specific securities, money market instruments or other debts. Ratings are measured on a scale that generally ranges from AAA/Aaa (highest) to D/C (lowest); ratings are subject to change without notice. For more information on Standard and Poor’s rating methodology, please visit standardandpoors.com and select ‘Understanding Ratings’ under Rating Resources on the homepage or Moody’s at moodys.com and select ‘Rating Methodologies’ under Research and Ratings on the homepage. Please see the Information Supplement for a discussion of situations in which the Trust may designate previously distributed interest income during the year as taxable net capital gain in order to satisfy certain of the annual distribution requirements for regulated investment companies. Invesco and its representatives do not provide tax advice. Individuals should consult their personal tax advisors before making any tax-related statement decisions. Diversification does not guarantee a profit or eliminate the risk of loss.

FOR USE ONLY — NOT FOR USE WITH THE PUBLIC

Before investing, investors should carefully read the prospectus and consider the investment objectives, risks, charges and expenses. For this and more complete information about the trust, investors should ask their advisor(s) for a prospectus or download one at invesco.com/uit. The information in the prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. The prospectus is not an offer to sell these securities and is not soliciting an offer to buy these securities in any state where the offer or sale is not permitted.

This does not constitute a recommendation of any investment strategy or product for a particular investor. Investors should consult a financial professional before making any investment decisions. Invesco unit investment trusts are distributed by the sponsor, Invesco Capital Markets, Inc. and broker dealers including Invesco Distributors, Inc. Both firms are indirect, wholly owned subsidiaries of Invesco Ltd.

Invesco • 11 Greenway Plaza, Suite 1000 • Houston, TX 77046-1188 invesco.com/uit U-MLHIGT37-ANFLY-1-E 02/19 NA1594