EXHIBIT 99.1

Form 4 List of Reporting Owners and Signature Page

Name of designated filer: Chatterjee Fund Management, L.P.

Other joint filers: Chatterjee Charitable Foundation, MCP Holdings Limited, Labvantage Solutions Technologies Limited, TCG Lifesciences Limited, CSL Holdings Limited, Purnendu Chatterjee

Address for Chatterjee Fund Management, L.P., Chatterjee Charitable Foundation and Purnendu Chatterjee is: 888 Seventh Avenue, 37th Floor, New York, NY 10106

Address for MCP Holdings Limited, Labvantage Solutions Technologies Limited, TCG Lifesciences Limited and CSL Holdings Limited is: c/o IQ EQ Corporate Services, 33, Edith Cavell Street Port-Louis, 11324, Mauritius

Date of Event Requiring Statement: January 17, 2020

Issuer Name and Ticker or Trading Symbol: McDermott International Inc. [MDR]

CHATTERJEE CHARITABLE FOUNDATION
By:	/s/  Purnendu Chatterjee
	Name: Purnendu Chatterjee
	Title: Trustee
MCPI HOLDINGS LIMITED
By:	/s/ Purnendu Chatterjee
	Name: Purnendu Chatterjee
	Title: Director
LABVANTAGE SOLUTIONS TECHNOLOGIES LIMITED
By:	/s/ Purnendu Chatterjee
	Name: Purnendu Chatterjee
	Title: Director
TCG LIFESCIENCES LIMITED
By:	/s/ Purnendu Chatterjee
	Name: Purnendu Chatterjee
	Title: Director
CSL HOLDINGS LIMITED
By:	/s/ Purnendu Chatterjee
	Name: Purnendu Chatterjee
	Title: Director
CHATTERJEE FUND MANAGEMENT, LP
By:	/s/  Purnendu Chatterjee
	Name: Purnendu Chatterjee
	Title: General Partner
	/s/  Purnendu Chatterjee
	Purnendu Chatterjee