Livestock commercialization in pastoral drylands depends on market organization, capital, information, infrastructure, trader relationships and institutions under climate and security risks. This study examined livestock marketing systems and competitive rivalry in Nanam, Lokiriama and Kainuk secondary markets in Turkana County, Kenya. A mixed-methods, non-experimental design combined questionnaire data from 168 traders, 56 per market, with interviews, market observations and secondary evidence. Descriptive statistics, analysis of variance and thematic analysis examined market structure and competition. Trading was widespread but fragmented: barter, informal transactions and cash-based sale yards coexisted with Livestock Marketing Association (LMA) and co-management arrangements. Respondents reported weak organization, inadequate capital, transport constraints and poor terminal-market linkages. Competitive-rivalry scores differed significantly, F(2, 165) = 39.966, p < .001: Nanam recorded a mean of 3.62, Lokiriama 2.79 and Kainuk 2.94. Overall, 56.52% disagreed or strongly disagreed that competition was well exercised, and 60.7% rejected the adequacy of trader capital. Qualitative evidence associated stronger financial resources, information, transport and downstream networks with greater purchasing and bargaining capacity. Smaller traders could become suppliers or intermediaries rather than independent competitors. The study proposes integrated commercialization through commercially capable organizations, transparent pricing, finance, logistics, animal-health services and structured buyer relationships. Existing pastoral institutions should be progressively connected to higher-value markets, while public actors concentrate on facilitation, regulation and public goods. Success should be measured through producer and trader margins, transaction costs, buyer diversity, repeat trade, private investment and resilience, rather than market numbers or livestock sales alone.