If you're interested in broad exposure to the Financials - Regional Banks segment of the equity market, look no further than the SPDR S&P Regional Banking ETF (KRE), a passively managed exchange traded fund launched on 06/19/2006.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.Sector ETFs are also funds of convenience, offering many ways to gain low risk and diversified exposure to a broad group of companies in particular sectors. Financials - Regional Banks is one of the 16 broad Zacks sectors within the Zacks Industry classification. It is currently ranked 2, placing it in top 13%.Index DetailsThe fund is sponsored by State Street Global Advisors. It has amassed assets over $5.86 billion, making it one of the largest ETFs attempting to match the performance of the Financials - Regional Banks segment of the equity market. KRE seeks to match the performance of the S&P Regional Banks Select Industry Index before fees and expenses.The S&P Regional Banks Select Industry Index represents the regional banks segment of the S&P Total Market Index.CostsExpense ratios are an important factor in the return of an ETF and in the long term, cheaper funds can significantly outperform their more expensive counterparts, other things remaining the same.Annual operating expenses for this ETF are 0.35%, making it one of the cheaper products in the space.It has a 12-month trailing dividend yield of 1.91%.Sector Exposure and Top HoldingsWhile ETFs offer diversified exposure, which minimizes single stock risk, a deep look into a fund's holdings is a valuable exercise. And, most ETFs are very transparent products that disclose their holdings on a daily basis.This ETF has heaviest allocation in the Financials sector--about 100% of the portfolio.Looking at individual holdings, Silvergate Capital Corp. Class A (SI) accounts for about 3.01% of total assets, followed by Western Alliance Bancorp (WAL) and Regions Financial Corporation (RF).The top 10 holdings account for about 21.95% of total assets under management.Performance and RiskSo far this year, KRE has added about 1.39%, and is up roughly 14.51% in the last one year (as of 02/23/2022). During this past 52-week period, the fund has traded between $59.87 and $78.78.The ETF has a beta of 1.28 and standard deviation of 40.86% for the trailing three-year period, making it a high risk choice in the space. With about 134 holdings, it effectively diversifies company-specific risk.AlternativesSPDR S&P Regional Banking ETF holds a Zacks ETF Rank of 2 (Buy), which is based on expected asset class return, expense ratio, and momentum, among other factors. Because of this, KRE is a great option for investors seeking exposure to the Financials ETFs segment of the market. There are other additional ETFs in the space that investors could consider as well.Invesco KBW Regional Banking ETF (KBWR) tracks KBW Nasdaq Regional Banking Index and the iShares U.S. Regional Banks ETF (IAT) tracks Dow Jones U.S. Select Regional Banks Index. Invesco KBW Regional Banking ETF has $88.06 million in assets, iShares U.S. Regional Banks ETF has $1.47 billion. KBWR has an expense ratio of 0.35% and IAT charges 0.41%.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 key ETF info delivered straight to your inbox? Zacks’ free Fund Newsletter will brief you on top news and analysis, as well as top-performing ETFs, each week.Get it free >>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 SPDR S&P Regional Banking ETF (KRE): ETF Research Reports Regions Financial Corporation (RF): Free Stock Analysis Report Silvergate Capital Corporation (SI): Free Stock Analysis Report Western Alliance Bancorporation (WAL): Free Stock Analysis Report iShares U.S. Regional Banks ETF (IAT): ETF Research Reports Invesco KBW Regional Banking ETF (KBWR): ETF Research Reports To read this article on Zacks.com click here.