Background: Sexual and gender expansive (SGE) individuals in Kazakhstan are disproportionately affected by HIV yet stigma and discrimination pose ethical and practical challenges for HIV prevention research involving them. Although researchers are tasked with ensuring that risks of research participation are reasonable in relation to its benefits, participation-related risks and benefits—including negative and positive social impacts (NSIs and PSIs respectively) on personal relationships, social status, health, and other aspects of life—among SGE populations have received little attention.Methods: We examined NSIs and PSIs of participation among SGE individuals in a three-city HIV prevention study in Kazakhstan at the clinical trial's follow-up visits. We analyzed responses from 579 unique SGE participants who completed a total of 2648 follow-up visits over the 36-month study period (2019–2022).Results: Overall, NSIs were rare: 9 (2%) participants reported NSIs during the study; virtually no NSIs (mean=0.0037, SD=0.03) were reported at each follow-up visit. These few NSIs included 'trouble with friends, family, or acquaintances' and 'other'. By contrast, PSIs were extensive: 515 (89%) participants reported PSIs during the study; almost an average of five PSIs (mean=4.8, SD=3.4) were reported at each follow-up visit. The most endorsed PSIs were 'gained knowledge', 'improvement in HIV-related issues', and 'improvement in life'.Conclusions: Our findings demonstrate the potential for HIV prevention research to be associated with PSIs for SGE individuals experiencing stigmatization and discrimination. Future research should address NSIs, particularly interpersonal challenges among network members, within HIV prevention research to minimize risks and burdens of participation.