Mattress brands Koala and Anytime Fitness on Monday joined Snooze in pulling advertising altogether from 2GB radio station as a result of Jones' comment that Prime Minister Scott Morrison should "shove a sock down [Ms Ardern's] throat".
ME Bank withdrew advertising from Jones' show on Friday and a spokesman said they are reviewing their position over ongoing expenditure.
Jones' comment, made during last Thursday's breakfast program in response to Ms Ardern's criticism of Australia on climate change at the Pacific Islands Forum, drew widespread condemnation – including from Mr Morrison who described it as "way out of line".
Jones – whose show is simulcast to Brisbane's 4BC and Canberra's 4CC – initially issued a statement saying his comments had been "misinterpreted" on Thursday afternoon, but did not apologise. He then continued to verbally attack Ms Ardern the next morning, calling her a "hypocrite" and "gormless".
Later on Friday, Jones wrote to Ms Ardern to apologise, as well as announcing his error publicly.
"My comments were careless and they should have been more clearly thought and to that extent I have erred and made a mistake," Jones said on 2GB, which is owned by Macquarie Media. "I was wrong and I apologise."
By that stage, ME Bank had pulled advertising following a campaign by Sleeping Giants – an organisation that pressures advertisers to, in its own words, "make racism, bigotry and misogyny less profitable".
Macquarie Media chairman Russell Tate said on Saturday that Jones' contract, which was renewed for two years in May, would be terminated if he made "any recurrence of commentary of this nature".
But advertisers on Monday have continued to announce their departure.
Global gym franchise Anytime Fitness announced via Facebook it had pulled all advertising from 2GB on Friday and "do not have any further advertising planned with the station".
Australian mattress brand Koala announced its move via Twitter, telling 2GB "time to wake up".
"Koala has cut ties with Alan Jones. We’re a significant buyer in the medium, and it’s something we should have done earlier. Climate change is real, violence against women starts with words and the bloke has had too many chances."
In addition to targeting advertisers, Sleeping Giants has also launched a campaign to "send a sock" to Nine Entertainment chair Peter Costello in a bid to have Jones ousted. Nine has a majority stake in Macquarie Media, and is also the owner of this masthead.
Jenny Noyes is a journalist at the Sydney Morning Herald. She was previously a writer and editor at Daily Life.