Thousands of technology, finance and manufacturing companies are working closely with U.S. national security agencies, providing sensitive information and in return receiving benefits that include access to classified intelligence, four people familiar with the process said.

These programs, whose participants are known as trusted partners, extend far beyond what was revealed by Edward Snowden, a computer technician who did work for the National Security Agency. The role of private companies has come under intense scrutiny since his disclosure this month that the NSA is collecting millions of U.S. residents’ telephone records and the computer communications of foreigners from Google. and other Internet companies under court order.

Many of these same Internet and telecommunications companies voluntarily provide U.S. intelligence organizations with additional data, such as equipment specifications, that don’t involve private communications of their customers, the four people said.

Makers of hardware and software, banks, Internet security providers, satellite telecommunications companies and many other companies also participate in the government programs. In some cases, the information gathered may be used not just to defend the nation but to help infiltrate computers of its adversaries.

Along with the NSA, the Central Intelligence Agency, the Federal Bureau of Investigation and branches of the U.S. military have agreements with such companies to gather data that might seem innocuous but could be highly useful in the hands of U.S. intelligence or cyber warfare units, according to the people, who have either worked for the government or are in companies that have these accords.

Microsoft Corp., the world’s largest software company, provides intelligence agencies with information about bugs in its popular software before it publicly releases a fix, according to two people familiar with the process. That information can be used to protect government computers and to access the computers of terrorists or military foes.

Redmond, Washington-based Microsoft and other software or Internet security companies have been aware that this type of early alert allowed the U.S. to exploit vulnerabilities in software sold to foreign governments, according to two U.S. officials. Microsoft doesn’t ask and can’t be told how the government uses such tip-offs, said the officials, who asked not to be identified because the matter is confidential.

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