Layline institutional holding reports

This dataset captures the quarterly investment holdings of institutional investment managers and maps the ownership structure of public firms. These Schedule 13F reports are submitted to the Securities and Exchange Commission quarterly by all institutional investment managers with at least $100 million in assets under management. Most academic research examining the common ownership of corporations and the portfolio holdings of large investment managers is based on proprietary commercial databases. This hinders the replication of prior work due to unequal access to these subscriptions and because the data manipulation steps in commercial databases are often opaque. To overcome these limitations, the presented dataset is created from the original regulatory filings; it is updated daily and includes all information reported by investment managers without alteration.本数据集收录了机构投资管理人的季度投资持仓信息，并刻画了上市公司的股权结构。所有资产管理规模不低于1亿美元的机构投资管理人，需按季度向美国证券交易委员会（Securities and Exchange Commission, SEC）提交13F表格（Schedule 13F）报告。当前绝大多数针对企业共同所有权与大型投资管理人投资组合持仓的学术研究，均基于商业化专有数据库。这使得此前的研究成果难以被复现，原因在于不同研究者获取这些付费订阅数据库的权限不均，且商业化数据库的数据处理流程通常不透明。为克服上述局限，本数据集直接源自原始监管报备文件，每日更新，并完整保留投资管理人提交的全部报备信息，未做任何修改。