SAIA INC 10-Q

Item 5. Other Information —None 22 Item 6. Exhibits Exhibit Number Description of Exhibit 3.1 Restated Certificate of Incorporation of Saia, Inc., as amended (incorporated herein by reference to Exhibit 3.1 of Saia, Inc.’s Form 8-K (File No. 0-49983) filed on July 26, 2006) . 3.2 Amended and Restated By-laws of Saia, Inc. (incorporated herein by reference to Exhibit 3.1 of Saia, Inc.’s Form 8-K (File No. 0-49983) filed on July 29, 2008) . 3.3 Certificate of Elimination filed with the Delaware Secretary of State on December 16, 2010 (incorporated herein by reference to Exhibit 3.1 of Saia, Inc.’s Form 8-K (File No. 0-49983) filed on December 20, 2010) . 31.1 Certification of Principal Executive Officer Pursuant to Exchange Act Rule 13a-15(e). 31.2 Certification of Principal Financial Officer Pursuant to Exchange Act Rule 13a-15(e). 32.1 Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 . 32.2 Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 . 101 The following financial information from Saia, Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021, formatted in iXBRL (Inline Extensible Business Reporting Language) includes: (i) Condensed Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020 (unaudited), (ii) Condensed Consolidated Statements of Operations for the quarters ended March 31, 2021 and 2020 (unaudited), (iii) Consolidated Statements of Stockholders’ Equity for the three months ended March 31, 2021 and 2020 (unaudited), (iv) Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2021 and 2020 (unaudited), and (v) the Notes to Condensed Consolidated Financial Statements (unaudited). XBRL Instance Document – the XBRL Instance Document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document. 104 The cover page from Saia’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021 , formatted in Inline XBRL (included as Exhibit 101). 23 SIGNATURE Pursuant to the requirements 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. SAIA, INC. Date: April 28, 2021 /s/ Douglas L. Col Douglas L. Col Executive Vice President and Chief Financial Officer 24