Wong joined Finsbury in 2005. She is credited with building up the digital and social media team globally.
Elsewhere in London, Benita Barretto and Nicola McGowan have moved from associate partner to principal and four associates have become senior associates: Simon Ellis, Sarah Roberts, Olivia Simpson and Bryn Woodward.
In New York, Max Gross, Megan Kennedy, Amy Schultz have moved from senior associate to vice presidents.
Globally, five executives have moved to an associate position: Angharad Knill (London), Darya Lunina (Moscow), Aditi Mane (Dubai), Emma Russell (London), Harry Worthington (London).
The promotions follow mid-term appraisals at the agency.
Last month, the firm won a major global brief with HSBC. In April, parent firm WPP announced an alliance between it and another financial PR firm it owns in Germany.