# EDGAR Filing Document

**Accession Number:** 0001060955
**File Stem:** 0001060955-25-000065
**Filing Date:** 2025-8
**Character Count:** 5839
**Document Hash:** 072261de578ec36472b5722efc5919bd
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001060955-25-000065.hdr.sgml**: 20250812

**ACCESSION NUMBER**: 0001060955-25-000065

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 3

**CONFORMED PERIOD OF REPORT**: 20250812

**FILED AS OF DATE**: 20250812

**DATE AS OF CHANGE**: 20250812

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ICON PLC
- **CENTRAL INDEX KEY:** 0001060955
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH [8731]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 981067160

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 333-08704
- **FILM NUMBER:** 251206974

**BUSINESS ADDRESS:**
- **STREET 1:** SOUTH COUNTY BUSINESS PARK
- **STREET 2:** LEOPARDSTOWN
- **CITY:** DUBLIN 18
- **STATE:** L2
- **ZIP:** 00000
- **BUSINESS PHONE:** 00 353 1 291 2000

**MAIL ADDRESS:**
- **STREET 1:** SOUTH COUNTY BUSINESS PARK
- **STREET 2:** LEOPARDSTOWN
- **CITY:** DUBLIN 18
- **STATE:** L2
- **ZIP:** 00000

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ICON PLC  /ADR/
- **DATE OF NAME CHANGE:** 20010213

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

Washington, D.C. 20549

**FORM 6-K**

**Report of Foreign Private Issuer**

**Pursuant to Rule 13a-16 or 15d-16 under**

**the Securities Exchange Act of 1934**

For the month of

August 2025

333-08704

(Commission file number)

**ICON plc** 

(Translation of registrant's name into English)

South County Business Park, Leopardstown, Dublin 18, D18 X5R3, Ireland

(Address of principal executive offices)

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

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**<u>EXHIBIT LIST</u>**

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| | |
|:---|:---|
| <br><u>Exhibit</u> | <br><u>Description</u> |
| <br><u>[99.1](final-iconplcprovidesupdat.htm)</u> | <br><u>[ICON plc Provides Update on Vaccine Study](final-iconplcprovidesupdat.htm)</u> |

---

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**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.

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| | |
|:---|:---|
| | <br>**ICON plc**<br>/s/ Nigel Clerkin |
| <br>Date: August 12, 2025 | <br>Nigel Clerkin<br>Chief Financial Officer |

---

## Exhibit 99.1

**Exhibit 99.1**

![image_0.jpg](image_0.jpg)

**ICON plc Provides Update on Vaccine Study**

On August 12, 2025, ICON plc, announced that the large-scale next generation COVID vaccine study that was highlighted on our earnings call on July 24, 2025 as restarted and actively enrolling, has now had a stop work notice issued by BARDA to the sponsor. As a result, the sponsor has directed ICON to halt all screening and dosing activities for new subjects. Approximately half of the planned 10,000 subjects have already been enrolled (and dosed) in the trial and these participants will continue to be followed up per protocol. The sponsor remains in discussions with BARDA as they work to determine next steps. While the issuance of the stop work order will impact our revenue for the second half of 2025, there is no change to our financial guidance for the full year 2025.

This statement contains forward-looking statements, including statements about our financial guidance. 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 statement. 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 other 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, F-4, S-8, F-3 and certain other reports, which are available on the SEC's website at http://www.sec.gov.

Contact: Investor Relations +1 888 381 7923

Nigel Clerkin, Chief Financial Officer +353 1 291 2000

Kate Haven, Vice President Investor Relations +1 888 381 7923

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