Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.
Form 20-F [ X ]      Form 40-F [   ]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):

Note: Regulation S-T Rule 101(b)(1) only permits the submission in paper of a Form 6-K if submitted solely to provide an attached annual report to security holders.

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):

Note: Regulation S-T Rule 101(b)(7) only permits the submission in paper of a Form 6-K if submitted to furnish a report or other document that the registrant foreign private issuer must furnish and make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled or legally organized (the registrant's "home country"), or under the rules of the home country exchange on which the registrant's securities are traded, as long as the report or other document is not a press release, is not required to be and has not been distributed to the registrant's security holders, and, if discussing a material event, has already been the subject of a Form 6-K submission or other Commission filing on EDGAR. 

On March 29, 2019, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

(c) Exhibit 99.1. Press release dated March 29, 2019

SIGNATURES

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.

EXHIBIT 99.1

O2Micro Revises First Quarter 2019 Financial Guidance

GEORGE TOWN, Grand Cayman, March 29, 2019 (GLOBE NEWSWIRE) -- O2Micro® International Limited (NASDAQ: OIIM), a global leader in the design, development and marketing of high-performance integrated circuits and solutions, today revised its guidance for the first quarter of 2019. The company now expects its first quarter revenue to be approximately $12.5 million to $13 million, versus previous guidance of $13.9 million to $15.3 million. In addition, gross margin for the first quarter is expected to be 50% to 50.5%, which is within previously provided guidance. 

The reduction in anticipated revenue for the first quarter 2019 is primarily the result of inventory correction in the TV market, as well as changes within the industrial sector. Due to these changing market conditions and other external factors, these customers are also maintaining lower than normal inventories.

Sterling Du, Chairman and CEO of O2Micro, commented, "We expect the impact to our revenue by inventory correction to lessen in the second quarter of 2019. Our design wins continue to be strong as we expand into High Performance ICs in multiple applications supporting our path toward long term profitability.”

No conference call will be held in conjunction with this financial guidance update. Additional information will be available when the Company reports its first quarter results prior to market open on May 1st at 9am Eastern.

About O2Micro
Founded in April 1995, O2Micro develops and markets innovative power management components for the Computer, Consumer, Industrial, Automotive and Communications markets. Products include Backlighting, Battery Management, Power Management and LED General Lighting. The company maintains offices worldwide. Additional company and product information can be found on the company website at www.o2Micro.com.

O2Micro, the O2Micro logo, and combinations thereof are registered trademarks of O2Micro. All other trademarks or registered trademarks are the property of their respective owners.

Contact Information:
Daniel Meyberg
Investor Relations, O2Micro
Phone: 408.987.5920, x8888
Email: ir@o2micro.com