ADEX, the Peruvian exporters’ association, has published some interesting numbers about how few exporters account for the lion’s share of Peru’s exports. According to a recent study, 5.8% of the universe of 8,000 exporters account for 83.4% of the total amount that Peru sells to international markets. At the same time, 93% of companies which export are small or micro-sized, but these account for only 13% of foreign sales. Peru’s total exports in 2015 were worth US$33.3 billion.
http://www.adexperu.org.pe/index.php/prensa/notas-de-prensa/item/527-grandes-empresas-concentran-el-83-4-de-las-exportaciones-peruanas

Concentration, of course, depends hugely on the sector concerned. The mining sector, which accounted for 55% of exports in 2015, is highly concentrated in very few hands, although the statistics surrounding exports from artisanal and illicit mining may be rather harder to interpret than for transnational corporations. At the other end of the scale there are sectors like coffee production, where the huge majority of producers that export are small-scale, working on family farms. According to ADEX’s ranking of exporters, of the top 20, 16 are in the mining sector, three are firms engaged in the oil and gas industry, and one is a fishing company.

The league of top exporters is headed by Antamina (BHP-Billiton), followed by Southern Peru (Grupo México), Trafigura (Dutch commodity traders), Glencore (Swiss), Yanacocha (majority owned by Newmont), Cerro Verde (Freeport McMoRan), Xstrata (now part of Glencore), Barrick Gold (Canadian), Pluspetrol (Argentine) and Votorantim (Brazilian).
http://larepublica.pe/impresa/economia/743371-adex-apenas-464-empresas-concentran-mas-del-80-de-las-exportaciones-del-pais