**UNITED STATES SECURITIES AND EXCHANGE COMMISSION  
Washington, D.C. 20549****STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES** Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940   
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| | 1\. Name and Address of Reporting Person   
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Williamson Ken  
2\. Issuer Name **and** Ticker or Trading Symbol  
ION GEOPHYSICAL CORP [IO]  |  5\. Relationship of Reporting Person(s) to Issuer  
(Check all applicable)| _____ Director | _____ 10% Owner  
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__X__ Officer (give title below) | _____ Other (specify below)  
EVP&COO, E&P TECHNO & SERVICES  
| (Last) | (First) | (Middle)  
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2105 CITYWEST BOULEVARD, SUITE 100 3\. Date of Earliest Transaction (Month/Day/Year)  
05/30/2018  
|  (Street)   
  
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HOUSTON, TX 77042-2855 4\. If Amendment, Date Original Filed(Month/Day/Year)  
|  6\. Individual or Joint/Group Filing(Check Applicable Line)  
_X_ Form filed by One Reporting Person  
___ Form filed by More than One Reporting Person   
| (City) | (State) | (Zip)  
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**Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned**  
| 1.Title of Security  
(Instr. 3) | 2\. Transaction Date (Month/Day/Year) | 2A. Deemed Execution Date, if any (Month/Day/Year) | 3\. Transaction Code  
(Instr. 8) | 4\. Securities Acquired (A) or Disposed of (D)  
(Instr. 3, 4 and 5) | 5\. Amount of Securities Beneficially Owned Following Reported Transaction(s)  
(Instr. 3 and 4) | 6\. Ownership Form: Direct (D) or Indirect (I)  
(Instr. 4) | 7\. Nature of Indirect Beneficial Ownership  
(Instr. 4)  
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Code | V | Amount | (A) or (D) | Price  
New Common Stock  | 05/30/2018 | F |  3,477 (1) |  D  |  $ 23.8  |  77,507  |  D   
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.  
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**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.** | SEC 1474 (9-02)  
**Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned  
(_e.g._ , puts, calls, warrants, options, convertible securities)**1\. Title of Derivative Security  
(Instr. 3) | 2\. Conversion or Exercise Price of Derivative Security | 3\. Transaction Date (Month/Day/Year) | 3A. Deemed Execution Date, if any (Month/Day/Year) | 4\. Transaction Code  
(Instr. 8) | 5\. Number of Derivative Securities Acquired (A) or Disposed of (D)  
(Instr. 3, 4, and 5) | 6\. Date Exercisable and Expiration Date  
(Month/Day/Year) | 7\. Title and Amount of Underlying Securities  
(Instr. 3 and 4) | 8\. Price of Derivative Security  
(Instr. 5) | 9\. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)  
(Instr. 4) | 10\. Ownership Form of Derivative Security: Direct (D) or Indirect (I)  
(Instr. 4) | 11\. Nature of Indirect Beneficial Ownership  
(Instr. 4)  
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Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares  
  
## Reporting Owners

**Reporting Owner Name / Address** | **Relationships**  
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Director |  10% Owner |  Officer |  Other  
Williamson Ken  
2105 CITYWEST BOULEVARD  
SUITE 100  
HOUSTON, TX 77042-2855 |  EVP&COO, E&P TECHNO & SERVICES