The company has undertaken a complete review of its portfolio and has decided to cease publishing CosmoGirl! from its August edition and to close the CosmoGirl . It said it hopes to find other roles for the magazine's 12-strong editorial team, including acting editor Laurel Ives.
Jellyfish, the online magazine Natmags launched in March as a test of the potential for a digital offering targeting CosmoGirl! readers, is to be continued but with some changes.
The company has decided to refocus Jellyfish at an older age group of 18-to 25-year-olds and said it is still in a test period that is expected to run until September.
CosmoGirl! and Jellyfish publisher Lucy Drybrough will remain with the company.
Natmags has continued the reshuffle of publishing directors partly occasioned by the resignation of Cosmopolitan publishing director Jan Adcock in May, due to ill health.
Adcock was replaced by Justine Southall, who was previously publishing director of the young women's magazines group consisting of She, Company and Zest.
Southall's former role has now been handed to Meribeth Parker, the publisher of You and Your Wedding, its website and Cosmopolitan Bride.
Responsibility for those wedding titles passes to Matt Salmon, who is already publishing director of the lifestyle magazines group of Prima, Prima Baby and Babyexpert.co.uk.
In another change Ian Adkins, the publishing director of House Beautiful, has been made redundant and responsibility for the title has been passed to Liz Kershaw, the publishing director of the women's interest group of Good Housekeeping, Country Living and Coast.
CosmoGirl was the third highest selling teen title, with an average circulation of 131,956 in the second half of 2006 according to ABC figures. This was down 7.1% on the first half of 2006 and down 23.8% on the second half of 2005.
The top two titles are Hachette Filipacchi's monthly Sugar, on 200,541 copies, and Panini's monthly Bliss, on 151,729 copies.