PPK Group (ASX: PPK) is a diversified investment company with interests in a range of highly prospective and innovative technologies with broad application and high growth potential. The company's investments are at various stage of development and commercialisation and includes businesses with interests in batteries, ballistic armour, dental products, mining technology, and boron nitride nanotubes (BNNTs). PPK's major investments include:BNNT Technology LtdBNNT is leading the world in the development, manufacture and commercialisation of Boron Nitride Nanotubes (BNNT's). BNNT's have extraordinary mechanical properties and are considered the world's strongest and most advanced fibre and offer significant material benefits in aviation, automotive, space travel, power generation, batteries, electronics and defence. PPK acquired a 50% interest in BNNT Technology Ltd in March 2019.Craig International Ballistics LtdCraig International Ballistics (CIB) is a leading supplier of body armour to the Australian Defence Force (ADF) and Police Forces. PPK holds a 45% interest in CIB.Li-S Energy Pty LtdLi-S is planning to use BNNT's to overcome three major hurdles in the commercialisation of Lithium Sulphur batteries. PPK holds a 58% interest in Li-S Energy. Advanced Mobility Analytics Group Pty Ltd (AMAG)Advanced Mobility Analytics Group Pty Ltd (AMAG) aims to be the world's leading digital platform provider for proactive road safety analytics and management. PPK acquired a 20% in the company in 2020.3D Dental Technology Limited3D Dental Technology aims to infuse BNNT into nanocomposites with frequently used dental materials including zirconia, lithium disilicate, alumina and ceramic composite. PPK has a 45% interest in the business.PPK Mining EquipmentPPK Mining Equipment designs, manufactures, and services the industry-renowned range of COALTRAM flameproof and explosion proof diesel Load Haul Dump (LHD) utility vehicles.