{"value":{"contractors":[{"contractor":"JULIUS BERGER NIGERIA PLC","value":187353033328,"projects":4,"share":17.67},{"contractor":"LEBTECH CONSTRUCTION LIMITED","value":70297911440,"projects":7,"share":6.63},{"contractor":"CCECC","value":68887440148,"projects":3,"share":6.5},{"contractor":"SPRING CONCEPT & COMPANY","value":62337714903,"projects":5,"share":5.88},{"contractor":"SETRACO (NIGERIA) LIMITED","value":49794140168,"projects":2,"share":4.7},{"contractor":"LEVANT CONSTRUCTION LIMITED","value":47235180595,"projects":7,"share":4.46},{"contractor":"NIGER CONSTRUCTION LTD (NIGER CAT)","value":37968475501,"projects":7,"share":3.58},{"contractor":"ROADWELL CONTRACTING LIMITED","value":37082277852,"projects":7,"share":3.5},{"contractor":"SINOMA INVESTMENT INTERNATIONAL LTD","value":33006310793,"projects":2,"share":3.11},{"contractor":"PERCULIAR ULTIMATE CONCERNS LIMITED","value":29941995486,"projects":1,"share":2.82}],"distinct":208,"hhi":562,"top_share":58.9},"unit":"NGN","tier":"T5","tier_label":"Our calculation","method":"Contract sums grouped by the contractor name as published. Herfindahl-Hirschman index over value shares.","caveat":"Similar names have not been merged — entity resolution would likely raise concentration, so this figure understates rather than overstates it.","inputs":["Delta project register (T0)"]}