For example, fast-growing shale driller Pioneer Natural Resources (NYSE: PXD) was its second-largest holding, putting it above several big oil giants. What I like about the Vanguard Energy Fund is that it offers investors global exposure across the entire value chain, including producers, service companies, and logistics providers. However, for those who don't need much current income but want the inflation protection that these special bonds can provide, Vanguard Inflation-Protected Securities Fund is worth a closer look.