FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Report of Foreign Private Issuer
Pursuant to Rule 13a-16 under
the Securities Exchange Act of 1934


For the month ended February, 2018


ICON plc
(Registrant's name)


333-08704
(Commission file number)


South County Business Park, Leopardstown, Dublin 18, Ireland
(Address of principal executive offices)

Brendan Brennan, CFO
South County Business Park, Leopardstown, Dublin 18, Ireland.
Brendan.Brennan@iconplc.com
00-353-1-291-2000
(Name, telephone number, email and/or facsimile number and address of Company contact person)

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

              Yes___X___                                   No_______

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

              Yes______                                    No___X___

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

              Yes______                                    No___X___

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

              Yes_______                                   No___X___

If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):82      N/A

EXHIBIT LIST

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

ICON Reports Fourth Quarter and Full Year 2017 Results

Highlights

• Quarter 4 gross business wins of $718 million, a gross book to bill of 1.58. Net business wins of $599 million, a net book to bill of 1.32. Full year gross business wins of $2.6 billion, a gross book to bill of 1.50, net business wins of $2.3 billion, a net book to bill of 1.29.
• Backlog of business grew 16.9% year on year to $4.93 billion.
• Quarter 4 net revenue increased 4.6% year on year to $455 million. Full year net revenue increased 5.5% to $1,758 million.
• Quarter 4 top customer revenue concentration reduced to 13.2% from 23.8% in quarter 4 2016. In the quarter revenue outside our top customer, increased by 19.2% year over year.
• Quarter 4 income from operations increased 6.0% year on year to $89.7 million, or 19.7% of revenue. Full year 2017 income from operations increased by 8.2% to $346.1 million.
• Earnings per share for quarter 4 of $1.43, a 7.5% increase year on year. 2017 earnings per share on a pro forma full year basis were $5.39, an increase of 13.0% on 2016.
• Full year 2018 guidance updated to take account of ASC 606. Revenue to be in the range of $2,520 -$2,640 million. Earnings per share guidance unchanged in the range of $5.89 - $6.09 representing an increase of 9.3% – 13.0%.

DUBLIN--(BUSINESS WIRE)--February 15, 2018--ICON plc (NASDAQ: ICLR), a global provider of drug development solutions and services to the pharmaceutical, biotechnology and medical device industries, today reported its financial results for the fourth quarter and full year ended December 31, 2017.

CEO Dr. Steve Cutler commented, “2017 was another strong year for ICON. Positive business win trends across all customer segments have diversified our business, resulting in backlog growth of 17% year on year and reducing our top customer concentration to 13% in quarter 4 from 24% in the same quarter last year. Full year revenues grew 5.5% to $1.758 billion, and our proactive cost management has enabled us to expand our operating margin to 19.7%.  As a result we have grown EPS 13% year on year to $5.39. We expect 2018 to be another robust year of revenue and earnings growth and in accordance with the new accounting standard we are updating our revenue guidance to a range of $2,520 - $2,640 million. Earnings per share guidance remains in the range of $5.89 - $6.09 representing an increase of 9.3% – 13.0%.”

Fourth Quarter 2017 Results

The positive business environment was reflected in the gross business wins in the fourth quarter of $718 million and cancellations in the quarter were $119 million, resulting in net business wins of $599 million and a net book to bill of 1.32.

In the fourth quarter net revenue grew 4.6% year on year to $455 million from $435 million in the same quarter last year. This represented 2.3% constant currency growth with revenue outside of our top customer growing 19.2% year over year. Concentration levels of ICON’s largest customer significantly reduced from 23.8% of revenue last year to 13.2% this quarter. This customer now represents 11% of ICON’s backlog down from 15% last year.

An efficient operational model drove income from operations in the quarter up by 6.0% to $89.7 million, or 19.7% of revenue, compared to $84.6 million or 19.5% for the same quarter last year.

Net income in the quarter increased by 5.7% to $78.5 million on a non-GAAP basis compared with $74.3 million in the same quarter last year. This was helped by our industry leading underlying effective tax rate of 12% and global business support model that brought SG&A costs down to 18.0% of revenue.

Earnings per share increased to $1.43 per share on a diluted non-GAAP basis, from $1.33 per share for the same quarter last year, an increase of 7.5% reflecting a strong quarter for ICON.

We continued our share repurchase program in the quarter buying $25 million worth of stock at an average price of $113.08 per share.

The Company recorded a non-recurring tax expense of $7.4 million during the quarter, principally as a result of the mandatory repatriation provisions contained in the Tax Cuts and Jobs Act enacted during the fourth quarter of 2017. Excluding the non-recurring tax expense the pro-forma tax rate was 10% for the fourth quarter and 12% for the full year.

Full Year 2017 Results

Full year gross business wins were $2.6 billion and cancellations were $0.3 billion, resulting in net business wins of $2.3 billion and a net book to bill of 1.29. This led to strong backlog growth of 16.9% year on year.

Full year revenue increased by 5.5% to $1,758 million from $1,666 million in 2016.

Income from operations for 2017, on a non-GAAP basis, increased by 8.2% to $346 million or 19.7% of revenue compared with $320 million or 19.2% of revenue in the previous year.

Net income for 2017, on a non-GAAP basis, increased by 9.8% to $296 million compared with $269 million last year.

Earnings per share for 2017, on a non-GAAP basis, increased to $5.39 per diluted share from $4.77 per diluted share last year, an increase of 13.0%.

Day’s sales outstanding, comprising accounts receivable and unbilled revenue less payments on account, were 49 days at December 31, 2017, compared with 50 days at the end of September 2017 and 50 days at the end of December 2016.

Cash generated from operating activities for the quarter was $105.9 million. Capital expenditure for the quarter was $21 million. As a result, at December 31, 2017, the company had net cash of $11.6 million, compared to net debt of $56 million at September 30, 2017 and net debt of $88 million at the end of December 2016.

During the year we repurchased $133 million shares in total at an average price of $83.76.

In July, ICON acquired the Mapi Group, a leading health outcomes research and commercialisation company. Integration plans are underway and progressing well. This combined division has in excess of 1,400 heads, operating throughout ICON’s global network and enhances ICON’s key late stage service offerings. The additional scale and capabilities means that ICON is the world’s second largest provider of late phase services.

As of January 1, 2018 ICON has adopted the new revenue recognition standard (ASC 606). As a result we are updating our full year 2018 revenue guidance to $2,520 -$2,640 million. Earnings per share guidance remains unchanged in the range of $5.89 - $6.09 representing an increase of 9.3% – 13.0%.

In addition to the financial measures prepared in accordance with generally accepted accounting principles (GAAP), this press release contains certain non-GAAP financial measures, including non-GAAP operating and net income and non-GAAP diluted earnings per share. While non-GAAP financial measures are not superior to or a substitute for the comparable GAAP measures, ICON believes certain non-GAAP information is useful to investors for historical comparison purposes.

ICON will hold its fourth quarter conference call today, February 15, 2018 at 09:00 EDT [14:00 Ireland & UK]. This call and linked slide presentation can be accessed live from our website at http://investor.iconplc.com. A recording will also be available on the website for 90 days following the call. In addition, a calendar of company events, including upcoming conference presentations, is available on our website, under “Investors”. This calendar will be updated regularly.

This press release contains forward-looking statements. These statements are based on management's current expectations and information currently available, including current economic and industry conditions. These statements are not guarantees of future performance or actual results, and actual results, developments and business decisions may differ from those stated in this press release. The forward-looking statements are subject to future events, risks, uncertainties and other factors that could cause actual results to differ materially from those projected in the statements, including, but not limited to, the ability to enter into new contracts, maintain client relationships, manage the opening of new offices and offering of new services, the integration of new business mergers and acquisitions, as well as economic and global market conditions and other risks and uncertainties detailed from time to time in SEC reports filed by ICON, all of which are difficult to predict and some of which are beyond our control. For these reasons, you should not place undue reliance on these forward-looking statements when making investment decisions. The word "expected" and variations of such words and similar expressions are intended to identify forward-looking statements. Forward-looking statements are only as of the date they are made and we do not undertake any obligation to update publicly any forward-looking statement, either as a result of new information, future events or otherwise. More information about the risks and uncertainties relating to these forward-looking statements may be found in SEC reports filed by ICON, including its Form 20-F, F-1, S-8 and F-3, which are available on the SEC's website at http://www.sec.gov.

ICON plc is a global provider of drug development solutions and services to the pharmaceutical, biotechnology and medical device industries. The company specialises in the strategic development, management and analysis of programs that support clinical development - from compound selection to Phase I-IV clinical studies. With headquarters in Dublin, Ireland, ICON currently, operates from 98 locations in 38 countries and has approximately 13,250 employees. Further information is available at www.iconplc.com.

ICON/ICLR-F

CONTACT:
ICON plc
Investor Relations, 1-888-381-7923
or
Brendan Brennan, + 353 1 291 2000
Chief Financial Officer
or
Jonathan Curtain, +1 215 616 3000
Vice President Corporate Finance & Investor Relations
http://www.iconplc.com