The Business Roundtable, a lobbying organization of major companies' chief executives, also said its first-quarter survey of CEOs showed strong support for Congress to create a new national law governing consumer data privacy.
The group's economic outlook index for the January-March quarter fell to 95.2, down from 104.4 in the fourth quarter of 2018. The lower reading, however, far exceeded the index's historical average of 82.4 for the ninth straight quarter.
The new survey showed that companies' plans for capital investment in the next six months fell 6.9 percentage points since the 2018 fourth quarter, while sales expectations dropped 9.6 percentage points. The executives' hiring plans for the next six months showed an even more dramatic decrease of 11.3 percentage points.
A slowdown in manufacturing and retail, sluggish housing and construction activity and global pressures, including an ongoing trade war with China, have dampened expectations for economic growth.
Reflecting the dimmer view of the economy as growth slows in the U.S. and abroad, the Federal Reserve left its key interest rate unchanged Wednesday. The Fed kept the rate - which can influence everything from mortgages to credit cards to home equity lines of credit - in a range of 2.25 percent to 2.5 percent.
Still, experts say, the economy remains on strong ground as its expansion - the second-longest on record - continues.
The economy, as measured by the gross domestic product, grew 2.9 percent last year, the fastest pace since 2015.
In the new survey, 80 percent of the CEOs said it was "somewhat" or "very" important for Congress to craft and enact a national data privacy law.
As public concerns have risen over scandals and aggressive use of personal data at companies like Facebook, Amazon and Google, European regulators have slapped huge penalties on U.S. tech companies. California is putting in a tough measure, set to take effect next year, that will let the state's consumers request the data collected from them and opt out of future collection.
The tech industry is pushing for what it sees as the lesser of the evils: a new federal privacy law that would be less stringent than California's and take national precedence over it.
"This crazy patchwork quilt of different privacy regulations ... is a big impediment to business and to innovation," Josh Bolten, president of the CEOs' organization who was White House chief of staff under President George W. Bush, said in a conference call with reporters.
The organization is proposing legislation that would establish a basic standard for users' individual privacy rights and give businesses a common set of rules, Bolten said.
Jamie Dimon, CEO of JPMorgan Chase and chairman of the group, said the plans for capital spending and hiring shown in the survey remain strong, "a sign of continued confidence in the American economy amid easing global growth forecasts."
Congress and the Trump administration need to enact policies to expand free and fair trade, invest in infrastructure and employee training, and "fix our broken immigration system," Dimon said.
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