Launched on 10/31/2014, the ARK Genomic Revolution Multi-Sector ETF (ARKG) is a passively managed exchange traded fund designed to provide a broad exposure to the Healthcare - Broad segment of the equity market.An increasingly popular option among retail and institutional investors, passively managed ETFs offer low costs, transparency, flexibility, and tax efficiency; they are also excellent vehicles for long term investors.Investor-friendly, sector ETFs provide many options to gain low risk and diversified exposure to a broad group of companies in particular sectors. Healthcare - Broad is one of the 16 broad Zacks sectors within the Zacks Industry classification. It is currently ranked 5, placing it in top 31%.Index DetailsThe fund is sponsored by Ark Investment Management. It has amassed assets over $250.13 M, making it one of the average sized ETFs attempting to match the performance of the Healthcare - Broad segment of the equity market.This ETF is active and does not track a benchmark.CostsSince cheaper funds tend to produce better results than more expensive funds, assuming all other factors remain equal, it is important for investors to pay attention to an ETF's expense ratio.Annual operating expenses for this ETF are 0.75%, making it one of the most expensive products in the space.Sector Exposure and Top HoldingsEven though ETFs offer diversified exposure which minimizes single stock risk, it is still important to look into a fund's holdings before investing. Luckily, most ETFs are very transparent products that disclose their holdings on a daily basis.Looking at individual holdings, Intellia Therapeutics Inc (NTLA) accounts for about 10.91% of total assets, followed by Illumina Inc (ILMN) and Invitae Corp (NVTA).The top 10 holdings account for about 55.74% of total assets under management.Performance and RiskSo far this year, ARKG has added about 26.09%, and was up about 40.68% in the last one year (as of 08/20/2018). During this past 52-week period, the fund has traded between $21.96 and $31.69.The ETF has a beta of 1.64 and standard deviation of 28.27% for the trailing three-year period, making it a high risk choice in the space. With about 36 holdings, it has more concentrated exposure than peers.Bottom LineTo learn more about this product and other ETFs, screen for products that match your investment objectives and read articles on latest developments in the ETF investing universe, please visit Zacks ETF Center.Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report ARK-GENOMIC RVL (ARKG): ETF Research Reports Invitae Corporation (NVTA): Free Stock Analysis Report Illumina, Inc. (ILMN): Free Stock Analysis Report Intellia Therapeutics, Inc. (NTLA): Free Stock Analysis Report To read this article on Zacks.com click here.