The phrase "are continuing to extend" is correct and usable in written English.
It can be used to describe an ongoing action of making something longer or broader, often in a context of development or growth.
Example: "The company are continuing to extend their services to new markets to reach a wider audience."
Alternatives: "are still expanding" or "are in the process of extending".
The model has been so successful it now supports fair trade businesses worldwide and is continuing to extend its reach.
Google is continuing to extend its lead in users and revenue from Web search, while Yahoo's attempt to compete is foundering.
The Democratic Party is continuing to extend its core support among minority constituencies — now 41percentt of the Democratic electorate — into upscale, often suburban, areas as college-educated white women abandon the Republican Party in droves and as education, more broadly, becomes a new partisan dividing line.
It's also one more sign of how Facebook is continuing to extend its influence outside of its own platform and walled garden — although it's still stopping short of advertising on third-party sites.
But as it pursues its ambition to be a dashboard for business engagement across all of the web, and for more than just marketeers and social media managers, HootSuite is continuing to extend support to more sites.
Joining forces is a logical move for these companies, especially if they want to carve out a corner of the market from GoPro, which only seems to be continuing to extend its lead since its IPO last year.
The introduction of this service demonstrates how Nokia's HERE business is continuing to extend its industry-leading portfolio of products to meet the needs of its automotive customers.
He said it was continuing to grow, and had been extended from a five-year program, as initially planned, to one to be continued to 2025 by the Afghan authorities.
Any security for which unlisted trading privileges are continued or extended pursuant to this subsection shall be deemed to be registered on a national securities exchange within the meaning of this chapter.
