UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ........ to ........ Commission file number is 000-04197 UNITED STATES LIME & MINERALS, INC. (Exact name of registrant as specified in its charter) (State or ...

SECURITIES EXCHANGE ACT OF 1934 Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE Commission File Number 000-04197 United States Lime & Minerals, Inc. (Exact name of Registrant as specified in its charter) Texas (State or other jurisdiction of incorporation ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ........ to ........ Commission file number is 000-04197 UNITED STATES LIME & MINERALS, INC. (Exact name of registrant as specified in its charter) (State ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ........ to ........ Commission file number is 000-04197 Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION For the transition period from ........ to ........ Commission file number is 000-04197 UNITED STATES LIME & MINERALS, INC. Washington, D.C. 20549 Form 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (Exact name of registrant as specified in its charter) (State or ...

Table of Contents ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 000‑04197 United States Lime & Minerals, Inc. UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ 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 (Exact name of Registrant as specified in its charter) Texas (State or other jurisdiction of incorporation ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) TEXAS 75-0789226 5429 LBJ Freeway, Suite 230, Dallas, TX 75240 ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ........ to ........ Commission file number is 000-04197 UNITED STATES LIME & MINERALS, INC ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ........ to ........ Commission file number is 000-04197 UNITED STATES LIME & MINERALS, INC. (Exact name of registrant as specified in its charter) (State or o ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ........ to ........ Commission file number is 000-04197 UNITED STATES LIME & MINERALS, INC. (Exact name of registrant as specified in its charter) (Registran ...

Revenue Performance - Revenues from Lime and Limestone Operations decreased by 0.5% in 2018 compared to 2017, primarily due to a 1.8% decrease in sales volumes [145]. - Revenues from Natural Gas Interests increased by 12.6% in 2018 compared to 2017, driven by a 25.6% increase in average prices for natural gas and natural gas liquids [147]. - Revenues for 2018 decreased to $144.4 million from $144.8 million in 2017, a decrease of $0.4 million, or 0.3% [187]. - Revenues from Lime and Limestone Operations in 2018 decreased $0.7 million, or 0.5%, to $141.9 million, primarily due to decreased sales volumes [187]. - Revenues from Natural Gas Interests for 2018 increased $0.3 million, or 12.6%, to $2.5 million, due to higher average prices per MCF [188]. - Lime and limestone operations generated revenues of $141,922 in 2018, down from $142,612 in 2017, while natural gas interests increased to $2,513 from $2,232 [306]. Profitability - Gross profit decreased by 11.3% in 2018 compared to 2017, with Lime and Limestone Operations gross profit down 12.4% due to increased quarrying and transportation costs [148]. - Gross profit decreased to $30.5 million for 2018 from $34.4 million for 2017, a decrease of $3.9 million, or 11.3% [189]. - Operating profit for 2018 was $20.0 million, a decrease of 17.5% from $24.2 million in 2017 [242]. - Gross profit for the company in 2018 was $30,486, a decrease of 11.0% compared to $34,380 in 2017 [306]. Net Income - Net income decreased by $7.5 million, or 27.5%, in 2018 compared to 2017, primarily due to a prior year tax benefit and increased operational costs [151]. - Net income decreased to $19.7 million ($3.51 per share diluted) in 2018, compared to $27.1 million ($4.86 per share diluted) in 2017, a decrease of $7.5 million, or 27.5% [195]. - Net income for 2018 was $19,685,000, a decrease of 27.5% from $27,148,000 in 2017 [251]. - Basic net income per common share for 2018 was $3.52, down from $4.87 in 2017, while diluted net income per common share was $3.51 compared to $4.86 in 2017 [271]. Cash Flow and Investments - Net cash provided by operating activities was $38.7 million in 2018, a 13.0% increase from $34.3 million in 2017 [207]. - Net cash used in investing activities was $53.2 million in 2018, compared to $20.7 million in 2017, including $26.2 million for the St. Clair kiln project [208]. - Cash and cash equivalents decreased to $67.2 million at December 31, 2018, down from $85.0 million at December 31, 2017 [210]. - The company invested $53,762,000 in property, plant, and equipment in 2018, significantly higher than $21,337,000 in 2017, marking an increase of 152.5% [251]. Shareholder Returns - A share repurchase program was extended in November 2018, allowing for the repurchase of approximately $7.2 million of common stock through November 30, 2019 [154]. - A quarterly cash dividend of $0.135 was declared on January 31, 2019, payable on March 15, 2019 [155]. - The company paid cash dividends of $3,022,000 in 2018, slightly up from $3,013,000 in 2017 [251]. - The company declared a quarterly cash dividend of $0.135 per share on January 31, 2019, reflecting ongoing shareholder returns [319]. Operational Efficiency and Future Outlook - The company aims to maintain or increase lime and limestone prices to offset rising costs amid competitive pressures [166]. - Modernization and expansion projects are expected to enhance operational efficiency and lower production costs, positioning the company competitively [160]. - The company expects to spend approximately $12.0 million annually on Lime and Limestone Operations for capital and re-equipping projects [206]. - The new fuel-efficient kiln at St. Clair is expected to cost approximately $50 million, with $38.7 million already spent as of December 31, 2018 [153]. Tax and Liabilities - The effective income tax rate for 2018 was 8.7%, compared to a benefit of (8.8%) in 2017, reflecting a $4.1 million increase in income tax expense [194]. - The total income tax expense for 2018 was $1,883, representing 8.7% of pretax income, compared to a benefit of $(2,205) in 2017 and an expense of $5,864 in 2016 [287]. - The company’s total liabilities decreased to $21.7 million in 2018 from $23.2 million in 2017, a reduction of 6.4% [240]. Assets and Equity - Total assets increased to $244.7 million in 2018, up from $228.4 million in 2017 [240]. - Stockholders' equity rose to $223.0 million in 2018, compared to $205.3 million in 2017, reflecting a growth of 8.6% [240]. - The company reported identifiable assets of $244,671 at the end of 2018, up from $228,446 in 2017, reflecting growth in asset base [306].