TGC INDUSTRIES INC

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Annual report pursuant to Section 13 or 15(d) (amendment)

Annual report pursuant to Section 13 or 15(d)

Results of Operations and Financial Condition

Beneficial ownership report for a holder of more than 5% (Schedule 13D) (amendment)

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Entry into a Material Definitive Agreement

Beneficial ownership report for a holder of more than 5% (Schedule 13D) (amendment)

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Entry into a Material Definitive Agreement

Submission of Matters to a Vote of Security Holders

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

Notification of late filing of Form 10-K

Results of Operations and Financial Condition

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

5.07

Additional Information for Proxy Statement/ Votes

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

2.02,7.01,9.01

5.02,9.01

5.03,5.07,9.01

5.02,9.01

5.02

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

Definitive Proxy Statement

Preliminary Proxy Statement

Definitive Proxy Statement

Letter from the SEC

No description available

Correspondence with the SEC

No description available

General form for quarterly reports under Section 13 or 15(d)

Letter from the SEC

Preliminary Proxy Statement

General form for quarterly reports under Section 13 or 15(d)

Annual report pursuant to Section 13 or 15(d) (amendment)

Annual report pursuant to Section 13 or 15(d)

Definitive Proxy Statement

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

No description available

No description available

Letter from the SEC

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration of Securities on Exchange

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Definitive Proxy Statement

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Definitive Proxy Statement

Post Effective Amendment to S-8

Written communication about a business combination transaction (Rule 425)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Additional Information for Proxy Statement/ Votes

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Correspondence with the SEC

Correspondence with the SEC

Prospectus Supplement for Primary Offering

Notice of Effectiveness

Registration statement under Securities Act of 1933 (amendment)

Correspondence with the SEC

Correspondence with the SEC

Registration statement under Securities Act of 1933 (amendment)

Letter from the SEC

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Correspondence with the SEC

Registration statement under Securities Act of 1933

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Annual Report Scanned (Paper)

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Correspondence with the SEC

Annual Report Scanned (Paper)

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Written communication about a business combination transaction (Rule 425)

Mays Ray L

Wilks Farris

Clark William Anthony

Mays Ray L

Clark William Anthony

Clark William Anthony

Mays Ray L

Shaw Ian M.

Clark William Anthony

Clark William Anthony

Mays Ray L

Krylov Sergei

Shaw Ian M.

Clark William Anthony

Conly Albert S.

Bradley Bruce Franklin

Krylov Sergei

Conly Albert S.