According to the big-fish-little-pond effect (BFLP) model, high individual academic performance in a particular subject is related to high self-concept in that subject, whereas high average classroom performance has a negative effect on self-concept. In the present study, data from Finnish primary school students in grade 3 (504 students), grade 4 (487 students), and grade 6 (365 students) are used to examine whether the assumptions of the BFLP effect model hold already in primary school. Furthermore, we examined gender differences in BFLP effect. The results showed that as expected students' high performance in literacy and in mathematics was related to high self-concept in the same subject. Support for the negative classroom effect was small and it depended on the school subject and student's gender. That is, a high average classroom performance already in grade 3 had a negative but small effect on boys' self-concept in mathematics. In literacy and among girls, only little support was found for the negative classroom effect. Keywords The big-fish-little-pond effect. Classroom effect. Self-concept of ability. Academic skills. Primary school Students' achievement-related beliefs play an important role in school by directing behavior and effort in learning situations (e.g., Atkinson 1964; Bandura 1997; Eccles et al. 1983; Wigfield et al. 2006). Students who believe that they can and will do well at school are more likely to perform better and to engage in an adaptive manner in academic tasks than students who have a negative self-perception and expect to fail (Pintrich and Schunk 2002). Several