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UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 10-K/A
(Amendment No. 1)

☑ | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2019
or

☐ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number 1-2328
GATX Corporation
(Exact name of registrant as specified in its charter)

New York | 36-1124040
(State or Other Jurisdiction of incorporation or Organization) | (I.R.S. Employer Identification No.)

233 South Wacker Drive
Chicago, IL 60606-7147
(Address of principal executive offices, including zip code)
(312) 621-6200
(Registrant's telephone number, including area code)
Securities Registered Pursuant to Section 12(b) of the Act:

Title of each class | Trading Symbol(s) | Name of Each Exchange on Which Registered
Common Stock | GATX | New York Stock Exchange
|  | Chicago Stock Exchange
5.625% Senior Notes due 2066 | GMTA | New York Stock Exchange

Securities Registered Pursuant to Section 12(g) of the Act:
None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes þ No o
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes o No þ
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ No o
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes þ No ¨
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer”, “accelerated filer”, “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer | þ | Accelerated filer | o
Non-accelerated filer | o | Smaller reporting company | ☐
|  | Emerging growth company | ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes o No þ
The aggregate market value of the voting and non-voting stock held by non-affiliates of the registrant was approximately $2.8 billion as of June 30, 2019.
There were 34.9 million common shares outstanding at January 31, 2020.
DOCUMENTS INCORPORATED BY REFERENCE

GATX’s definitive Proxy Statement filed on March 13, 2020 | PART III

Explanatory Note
On February 19, 2020, GATX Corporation (the “Company”) filed with the Securities and Exchange Commission its Annual Report on Form 10-K for the year ended December 31, 2019.
This Amendment No. 1 to Form 10-K (“Amendment No. 1”) of the Company is being filed solely to amend Item 15(c) to include the separate financial statements of Alpha Partners Leasing Limited ("APLL") as required under Rule 3-09 of Regulation S-X. The financial statements of APLL for its fiscal year ended December 31, 2019 were not available at the time the Company filed its Annual Report on Form 10-K. The required financial statements are now provided as Exhibit 99.1 to this Amendment No. 1.
Item 15 is the only portion of the Company’s Annual Report on Form 10-K being supplemented or amended by this Amendment No.1. This Amendment No. 1 does not change any other information set forth in the original filing of the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. This Amendment No. 1 consists solely of the preceding cover page, this explanatory note, the information required by Item 15(c) of Form 10-K as provided in Exhibit 99.1, a signature page, the consent of the independent auditors for APLL, and certifications required to be filed as exhibits hereto.
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PART IV
Item 15. Exhibits, Financial Statement Schedules
(a) 1. Financial Statements

| Page*
Documents Filed as Part of this Report: |
Report of Independent Registered Public Accounting Firm with respect to the consolidated financial statements | 57
Consolidated Balance Sheets — December 31, 2019 and 2018 | 59
Consolidated Statements of Comprehensive Income — Years Ended December 31, 2019, 2018, and 2017 | 60
Consolidated Statements of Cash Flows — Years Ended December 31, 2019, 2018, and 2017 | 61
Consolidated Statements of Changes in Shareholders’ Equity — Years Ended December 31, 2019, 2018, and 2017 | 62
Notes to Consolidated Financial Statements | 63
Report of Independent Registered Public Accounting Firm on Internal Control Over Financial Reporting | 108

_______
(*) Refers to the page numbers in the Company's Annual Report on Form 10-K filed on February 19, 2020.

2. | Financial Statement Schedules:

Schedules for which provision is made in the applicable accounting regulations of the Securities and Exchange Commission are not required under the related instructions or are inapplicable, and, therefore, have been omitted.
3. Exhibits.
(c) Separate financial statements of subsidiaries not consolidated and fifty percent or less owned persons
Under Rule 3-09 of Regulation S-X, we are required to file separate audited consolidated financial statements of Alpha Partners Leasing Limited, the foreign entities of the Rolls-Royce & Partners Finance joint ventures, for the year ended December 31, 2019. The financial statements included in Exhibit 99.1 for the years ended December 31, 2019, 2018 and 2017 are filed as part of Item 15 of the Company's Annual Report filed on February 19, 2020 and should be read in conjunction with the Company's consolidated financial statements.
EXHIBIT INDEX

Exhibit Number | Exhibit Description
Filed with this Report:
4.3** | Description of the Registrant's Securities.
21** | Subsidiaries of the Registrant.
23** | Consent of Ernst & Young LLP, Independent Registered Public Accounting Firm.
23.1 | Consent of PricewaterhouseCoopers LLP, Independent Auditors
24** | Powers of Attorney with respect to the Annual Report on Form 10-K for the fiscal year ended December 31, 2019.
31.1 | Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CEO Certification).
31.2 | Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CFO Certification).
32 | Certification Pursuant to 18 U.S.C. Section 1350 (CEO and CFO Certification).
99.1 | Financial Statements of Alpha Partners Leasing Limited.

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101** | The following materials from GATX Corporation’s Annual Report on Form 10-K for the year ended December 31, 2019, are formatted in Inline XBRL (eXtensible Business Reporting Language): (i) Consolidated Balance Sheets at December 31, 2019 and December 31, 2018, (ii) Consolidated Statements of Comprehensive Income for the years ended December 31, 2019, 2018, and 2017, (iii) Consolidated Statements of Cash Flows for the years ended December 31, 2019, 2018, and 2017, (iv) Consolidated Statements of Changes in Shareholders' Equity for the years ended December 31, 2019, 2018, and 2017, and (v) Notes to the Consolidated Financial Statements.
104 | Cover Page Interactive Data File (embedded within the Inline XBRL document).
Incorporated by Reference:
3.1 | Restated Certificate of Incorporation of GATX Corporation is incorporated herein by reference to Exhibit 3.2 to GATX’s Form 8-K dated October 31, 2013, file number 1-2328.
3.2 | Amended and Restated By-Laws of GATX Corporation are incorporated herein by reference to Exhibit 3.1 of GATX’s Form 8-K dated August 5, 2015, file number 1-2328.
4.1 | Indenture dated as of November 1, 2003 between GATX Financial Corporation and JP Morgan Chase Bank is incorporated herein by reference to Exhibit 4Q to GATX Financial Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2003, file number 1-8319.
4.2 | Indenture dated as of February 6, 2008, between GATX Corporation and U.S. Bank National Association, as Trustee, is incorporated herein by reference to Exhibit 4.12 to GATX’s Annual Report on Form 10-K for the fiscal year ended December 31, 2007, file number 1-2328.
10.1 | Five Year Credit Agreement dated as of May 23, 2019, among GATX Corporation, as Borrowers, Citibank, N.A. and BOFA Securities, Inc., as joint lead arrangers and joint book managers, Bank of America, N.A., as syndication agent, PNC Bank, N.A., U.S. Bank, National Association, Morgan Stanley MUFG Loan Partners, LLC and Keybank National Association, as co-documentation agents, Citibank, N.A., as administrative agent, and the lenders party thereto is incorporated herein by reference to Exhibit 10.1 to GATX’s Form 8-K dated May 23, 2019, file number 1-2328.
10.2 | Supply Agreement by and between GATX Corporation, as Buyer, and Trinity Rail Group, LLC, as Seller, dated March 14, 2011 is incorporated by reference to Exhibit 10.1.A to GATX’s Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2011, file number 1-2328 (Note: Portions of this document have been omitted pursuant to a Request for Confidential Treatment filed with the Securities and Exchange Commission on April 27, 2011).
| i. | First Amendment to Supply Agreement by and between GATX Corporation, as Buyer, and Trinity Rail Group, LLC, as Seller, dated April 25, 2011 is incorporated by reference to GATX’s Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2011, file number 1-2328.
10.3 | Supply Agreement by and between GATX Corporation, as Buyer, and Trinity Rail Group, LLC, as Seller, dated November 3, 2014 is incorporated by reference to Exhibit 10.25 to GATX’s Form 10-K for the fiscal year ended December 31, 2014, file number 1-2328 (Note: Portions of this document have been omitted pursuant to a Request for Confidential Treatment filed with the Securities and Exchange Commission on February 5, 2015).
| i. | First Amendment to Supply Agreement by and between GATX Corporation, as Buyer, and Trinity Rail Group, LLC, as Seller, dated May 24, 2018 is incorporated by reference to Exhibit 10.1 to GATX’s Quarterly Report on Form 10-Q for the fiscal quarter ended June 30, 2018 (Note: Portions of this document have been omitted pursuant to a Request for Confidential Treatment filed with the Securities and Exchange Commission on July 27, 2018).
10.4 | Summary of GATX Corporation Non-Employee Directors’ Compensation is incorporated herein by reference to the section entitled “Director Compensation” in GATX’s Definitive Proxy Statement filed on March 19, 2018, in connection with GATX’s 2018 Annual Meeting of Shareholders, file number 1-2328.*
10.5 | GATX Corporation 2004 Equity Incentive Compensation Plan is incorporated herein by reference to Exhibit C to the Definitive Proxy Statement filed on March 18, 2004 in connection with GATX’s 2004 Annual Meeting of Shareholders, file number 1-2328.*
| i. | Amendment of said Plan, effective as of December 7, 2007, is incorporated herein by reference to Exhibit 10.28 to GATX’s Annual Report on Form 10-K for the fiscal year ended December 31, 2007, file number 1-2328.*
| ii. | Second Amendment of GATX Corporation 2004 Equity Incentive Compensation Plan effective October 22, 2010, is incorporated by reference to Exhibit 10.7(ii) to GATX's Annual Report on Form 10-K for the fiscal year ended December 31, 2010, file number 1-2328.*
10.6 | Form of GATX Corporation Stock-Settled Stock Appreciation Right (SAR) Agreement for grants under the 2004 Equity Incentive Compensation Plan to executive officers on or after January 1, 2009, incorporated herein by reference to Exhibit 10.2 to GATX’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2009, file number 1-2328.*
10.7 | GATX Corporation 2012 Incentive Award Plan is incorporated herein by reference to Exhibit A to the Definitive Proxy Statement filed on March 16, 2012 in connection with GATX's 2012 Annual Meeting of Shareholders, file number 1-2328.*
| i. | Amendment and Restatement of said Plan, effective May 5, 2017, is incorporated herein by reference to Exhibit C to the Definitive Proxy Statement filed on March 24, 2017 in connection with GATX's 2017 Annual Meeting of Shareholders, file number 1-2328.*

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10.8 | GATX Corporation Cash Incentive Compensation Plan is incorporated herein by reference to Exhibit D to the Definitive Proxy Statement filed on March 18, 2004 in connection with GATX’s 2004 Annual Meeting of Shareholders, file number 1-2328.*
| i. | Amendment of said Plan, effective as of December 7, 2007, is incorporated herein by reference to Exhibit 10.30 to GATX’s Annual Report on Form 10-K for the fiscal year ended December 31, 2007, file number 1-2328.*
10.9 | Form of Amended and Restated Agreement for Employment Following a Change of Control dated as of January 1, 2009, between GATX Corporation and Brian A. Kenney is incorporated herein by reference to Exhibit 10.27 to GATX’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008, file number 1-2328.*
10.10 | Form of Amended and Restated Agreement for Employment Following a Change of Control dated as of January 1, 2009, between GATX Corporation and Robert C. Lyons, Deborah A. Golden, William M. Muckian, and Michael T. Brooks is incorporated herein by reference to Exhibit 10.28 to GATX’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008, file number 1-2328.*
10.11 | Form of Agreement for Employment Following a Change of Control between GATX Corporation and James M. Conniff (dated as of February 1, 2015) and Thomas A. Ellman (dated as of January 1, 2014) is incorporated herein by reference to Exhibit 10.1 to GATX's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2015, file number 1-2328.*
10.12 | Form of Agreement for Employment following a Change of Control between GATX Corporation and Niyi Adedoyin (dated as of January 29, 2016), Eric D. Harkness (dated as of February 1, 2015), Amita Shetty (dated as of August 9, 2018), Paul F. Titterton (dated as of January 1, 2014), Jeffery R. Young (dated as of February 1, 2015), and Robert A. Zmudka (dated as of August 9, 2018) is incorporated by reference to Exhibit 10.2 to GATX’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2015, file number 1-2328.*
10.13 | Form of Agreement for Employment Following a Change of Control between GATX Corporation and N. Gokce Tezel (dated as of March 1, 2018) is incorporated herein by reference to Exhibit 10.1 to GATX's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2015, file number 1-2328.*
10.14 | Form of GATX Corporation Indemnification Agreement for directors as of February 23, 2009, is incorporated herein by reference to Exhibit 10.1 to GATX's Form 8-K dated February 24, 2009, file number 1-2328.
10.15 | Form of Stock-Settled Stock Appreciation Right (SAR) Agreement for awards under the GATX Corporation 2012 Incentive Award Plan to executive officers with Agreements for Employment Following a Change of Control is incorporated by reference to Exhibit 10.24 of GATX's Annual Report on Form 10-K for the fiscal year ended December 31, 2012, file number 1-2328.*
10.16 | Form of Performance Share Agreement for grants under the GATX Corporation 2012 Incentive Award Plan to executive officers with Agreements for Employment Following a Change of Control is incorporated by reference to Exhibit 10.25 of GATX's Annual Report on Form 10-K for the fiscal year ended December 31, 2012, file number 1-2328.*
10.17 | Form of Performance Share Agreement (with cash-election option) for grants under the GATX Corporation 2012 Incentive Award Plan to executive officers with Agreements for Employment Following a Change of Control is incorporated by reference to Exhibit 10.1 to GATX’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2014, file number 1-2328.*
10.18 | Form of Performance Share Agreement (with cash-election option) for grants under the GATX Corporation Amended and Restated 2012 Incentive Award Plan to executive officers following adoption of the Tax Cuts and Jobs Act of 2017 is incorporated by reference to Exhibit 10.1 to GATX's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018.*
10.19 | Form of Option Agreement for awards under the GATX Corporation 2012 Incentive Award Plan to executive officers with Agreements for Employment Following a Change of Control, is incorporated by reference to Exhibit 10.1 to GATX's Annual Report on Form 10-K for the fiscal year ended December 31, 2016, file number 1-2328.*
10.20 | Form of Restricted Stock Unit Agreement for grants under the Amended and Restated 2012 Incentive Award Plan to Robert C. Lyons and Thomas A. Ellman is incorporated by reference to Exhibit 10.1 to GATX’s Form 8-K dated August 10, 2018, file number 1-2328.*
10.21 | Form of Confidential Information, Non-Competition, and Non-Solicitation Agreement between the Corporation and Robert C. Lyons and Thomas A. Ellman is incorporated by reference to Exhibit 10.2 to GATX’s Form 8-K dated August 10, 2018, file number 1-2328.*
10.22 | Amended and Restated GATX Corporation Directors' Voluntary Deferred Fee Plan, effective as of December 2, 2016, is incorporated by reference to Exhibit 10.1 to GATX's Annual Report on Form 10-K for the fiscal year ended December 31, 2016, file number 1-2328.*
10.23 | Amended and Restated GATX Corporation Director's Phantom Stock Plan, effective as of December 2, 2016, is incorporated by reference to Exhibit 10.2 to GATX's Annual Report on Form 10-K for the fiscal year ended December 31, 2016, file number 1-2328.*
10.24 | Employment Agreement dated as of October 27, 2017, between GATX Corporation and James F. Earl is incorporated by reference to Exhibit 10.1 of GATX’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, file number 1-2328.*
10.25 | Stock Purchase Agreement dated as of February 7, 2020, between GATX Corporation and Rand Logistics, Inc. is incorporated by reference to Exhibit 2.1 of GATX's Form 8-K dated February 10, 2020, file number 1-2328.

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10.26 | Undertakings to the GATX Corporation Salaried Employees’ Retirement Savings Plan is incorporated herein by reference to GATX’s Annual Report on Form 10-K for the fiscal year ended December 31, 1982, file number 1-2328.* (Paper copy).

_______
(*) Compensatory Plans or Arrangements.
(**) Included with the Company's Annual Report on Form 10-K filed on February 19, 2020.
Certain instruments evidencing long-term indebtedness of GATX Corporation are not being filed as exhibits to this Report because the total amount of securities authorized under any such instrument does not exceed 10% of GATX Corporation’s total assets. GATX Corporation will furnish copies of any such instruments upon request of the Securities and Exchange Commission.
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SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

| GATX CORPORATION |
|  | Registrant |  |
|  | /s/ BRIAN A. KENNEY |  |
|  | Brian A. Kenney |  |
|  | Chairman, President and Chief Executive Officer |  |
|  | March 30, 2020 |  |

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