[11] The main provisions of the bill make it easier for companies to share personal information with the government, especially in cases of cyber security threats.

The CISA has received some support from advocacy groups, including the United States Chamber of Commerce,[14] the National Cable & Telecommunications Association, and the Financial Services Roundtable.

[13] A number of business groups have also opposed the bill, including the Computer & Communications Industry Association,[15] as well as individual companies such as Twitter, Yelp, Apple, and Reddit.

[16] BSA (The Software Alliance) appeared initially supportive of CISA, sending a letter on July 21, 2015, urging the senate to bring the bill up for debate.

[17] On September 14, 2015, the BSA published a letter of support for amongst other things cyber threat information sharing legislation addressed to Congress, signed by board members Adobe, Apple Inc., Altium, Autodesk, CA Technologies, DataStax, IBM, Microsoft, Minitab, Oracle, Salesforce.com, Siemens, and Symantec.

[22] The Computer & Communications Industry Association, another major trade group including members such as Google, Amazon.com, Cloudflare, Netflix, Facebook, Red Hat, and Yahoo!, also announced its opposition to the bill.

[11] Some senators have announced opposition to CISA, including Ron Wyden (D-OR), Rand Paul (R-KY), and Bernie Sanders (I-VT).

[24] Senator Ron Wyden (D-OR) has objected to the bill based on a classified legal opinion from the Justice Department written during the early George W Bush administration.

[28] On August 4, 2015, White House spokesman Eric Schultz endorsed the legislation, calling for the senate to "take up this bill as soon as possible and pass it".

[31] In addition, the Department of Homeland Security has published a Privacy Impact Assessment detailing its internal review of the proposed system for handling incoming indicators from Industry.