It is largely unknown how persistence of biologic therapies in plaque psoriasis (psoriasis) has changed over time as more biologic options have become available. The objective of the present analysis is to study changes in persistence over time of biologic therapies in psoriasis from 2010-2018 in Sweden. A longitudinal observational population study was conducted in Sweden using individual-level data from the Swedish National Patient Register, Prescribed Drug Register, and Cause-of-Death Register. Included patients were adults diagnosed with psoriasis who were treated with a biologic between 2010-2018. Median treatment persistence time was estimated from 2010-2018 for ±1 year cohorts (2010-2012, 2011-2013, etc.) from Kaplan Meier curves. Biologic therapies with <20 patients and biologics used off label are not reported. The included population had 2,952 treatment periods (adalimumab: n=1,046, etanercept: n=974, ustekinumab: n=488, secukinumab: n=394, and ixekizumab: n=50). For adalimumab, etanercept, and ustekinumab, patients were included in the entire study period. For secukinumab and ixekizumab, patients were included from the 2013 and 2015 onwards, respectively. Median persistence for ustekinumab declined significantly from 62.3 months (45.6-∞) in 2010-2012 to 29.1 months (19.0-36.8) in 2013-2015, with similar results in 2014-2016. In the remaining time periods, ustekinumab did not reach the 50% persistence probability threshold yet. Median persistence for adalimumab and etanercept ranged from 23.5-15.3 months and 18.7-9.6 months, respectively, with no significant differences over time. Secukinumab and ixekizumab did not reach the 50% persistence probability threshold yet in most periods. Median persistence for adalimumab and etanercept was relatively stable over time, whereas a significant decrease in persistence over time was observed for ustekinumab. The timing of the entry of new biologics may need to be considered when analyzing treatment duration in psoriasis: the availability of more, effective treatment options may allow earlier treatment switch when treatment is suboptimal.