This issue brief uses data from the National Health Interview Survey (NHIS) to examine trends in employer-sponsored health insurance (ESI) for different of individuals and households in the United States. While ESI remains the leading source of coverage for nonelderly people, the percentage covered by an employer plan has declined over the past 15 years. A similar pattern exists with firm offer rates; fewer workers were offered health insurance from their employer in 2014 than in 1999. Families with low and modest incomes have been most affected by these declines.