This chapter follows individual voter flows using panel data for Social Democrats in Germany (1984-2018), the United Kingdom (1991-2018) and Switzerland (1999-2018). To our knowledge this chapter, thus, provides the first long running study of individual voting transitions amongst Social Democratic voters, following their transitions for almost 40 years. The key goal of this chapter is to understand where initial voters of the Social Democrats are today and which individual level characteristics correlate with leaving SDs. We find: 1) Social Democrats manage to keep some of their core 2) but a lot of their core gets de-mobilized or moves on to more progressive options (Greens, LibDem, Green Liberal Party). 3) SDs struggle in all countries to attract new voters, less so in Switzerland which we think is at least partly due to the progressive offer provided by the SP. In contrast, the German SPD loses to everyone and gains almost nothing. We also find evidence that SDs die out: the key factor correlated with ‘leaving’ is the generational cohort Social Democrats belong to. In contrast, often theorized and emphasized factors such as occupation, income or unemployment show much smaller correlations with former Social Democrats’ decision to leave the party behind.