SumOfUs is an environmentalist organization which pressures businesses to adopt left-of-center policies on the environment and animal liberation. It is also involved in other left-leaning issues such as pro-abortion advocacy, support for gun control, and pro-Palestinian activism.
In 2017, SumOfUs reported receiving $5.4 million in grants and contributions. 
SumOfUs provided over $220,000 in grants in 2017.  The grants went to diverse causes such as “reproductive work,” “bee pesticides,” “against sexism,” “plastic pollution,” and “racism in India.” 
SumOfUs declares that it has “partnerships” with the Open Society Foundations, Rockefeller Brothers Fund, Tides Foundation, and Media Democracy Fund, among many other non-profit and NGO organizations.  Media Democracy Fund gave SumOfUs a grant in 2014.  The Chorus Foundation gave $90,000 from 2012 to 2014.  The Tides Foundation has made several six-figure grants to SumOfUs. 
SumOfUs’ campaigns are largely focused on changing business practices to align with left-wing ideology. 
SumOfUs worked with allies to pressure European Union nations to not allow agricultural technology company Monsanto to renew the company’s license to use the pesticide glyphosate. While SumOfUs claims it blocked the renewed licensing, the EU approved Monsanto for a new five-year license in 2017. 
SumOfUs claims it helped stop the European Commission—the European Union’s executive arm–from approving the massive Bayer/Monsanto merger. Instead, the EU “launched an investigation” and the EU Commissioner “responded to our members directly,” reports SumOfUs.
The merger was ultimately approved in 2018. 
A major SumOfUs initiative is opposing pesticides which it claims harm bees. A fundraising letter in support of the EU’s ban on certain pesticides except for emergency situations urges supporters to donate to help the Bee Defenders Alliance. 
SumOfUs also has a petition campaign to pressure the EU to study the effects of pesticides which environmentalist activists say kill bees. 
Shortly after the EU banned certain pesticides in 2018, SumOfUs launched a petition urging Australia to crack down on pesticides. 
Like its ally Rainforest Action Network, SumOfUs opposes palm oil production. SumOfUs and its allies gathered 650,000 signatures before a European Commission vote in early 2019 on whether to ban subsidies for palm oil used in automobile fuel. The Commission issued the ban on subsidies due to deforestation concerns. A Forbes contributor concluded the ban will phase out palm oil in the EU, though Malaysia and Indonesia may challenge the ban. 
SumOfUs has engaged in several petition campaigns to pressure eBay, Visa, and WalMart to restrict consumer access to firearms.   It also urged several corporations – including Apple, Google, and Amazon – to stop funding the National Rifle Association’s television station. 
SumOfUs also Tweeted in favor of legalized abortion in Ireland in May 2018. 
SumOfUs petitioned Mastercard shareholders to force the company to vote on a proposal to better track funds from white supremacy and other extremist groups. As of May 15, 2019, a proposal was being developed ahead of Mastercard’s June annual meeting. 
SumOfUs Tweeted on May 15, 2019 that Airbnb was opposed to Palestinian rights in Israel by allowing its platform to be used for property rentals on certain Israeli land which previously belonged to Palestinians. 
Social Media Accountability
SumOfUs has called for more accountability from social media companies following the election riots in Brazil that occurred on January 8, 2023. The organization, “has accused social media platforms including Facebook, TikTok and Telegram of enabling yesterday’s assault on Brazil’s Congress and called for an immediate investigation into their role in the crisis.”  SumOfUs compared the situation in Brazil to the attack on the U.S. Capitol on January 6, 2021, claiming that social media was a driving factor in both events. The day after the Brazil riots, SumOfUs called for, “a rigorous investigation into yesterday’s actions, including into the role of social media platforms in facilitating the attack on Brazilian democracy.” 
Progressive Style Guide
SumOfUs produced a “Progressive Style Guide” in 2016 as a tactical document for left-leaning activists to use as a word choice resource.  The Guide examined issues of race, policing, abortion, immigration, disabilities, and more.
Reactions to News Events
SumOfUs also issued a number of statements regarding shareholder votes for major corporations in the spring of 2019. Many of its press statements in 2019 through May 15 are reactions to news, not statements about SumOfUs’ own initiatives, programs, or campaigns. 
SumOfUs has received criticism for its activism. Former EU risk and science communications specialist David Zaruk criticized the group for taking an anti-science approach to pesticides in one of its campaigns in Germany.  Likewise, a column at the Canadian publication Financial Post accused the group of acting in an unscientific fashion to accomplish oil and gas-related organizational goals. 
The far-left anti-capitalist blog Wrong Kind of Green has critiqued SumOfUs for allegedly supporting capitalism by encouraging corporations to be more environmentally friendly instead of trying to tear down the corporations themselves. 
The chairman and treasurer of SumOfUs’ board of directors is Tate Hausman. Hausman is a former MoveOn.org managing director and has been involved in many left-leaning political campaigns and causes. He is the founding Board Chair of SumOfUs. 
Hannah Lownsbrough is executive director of SumOfUs. She made $141,630 in 2017, and is also a Board Member of the LGBT activist group AllOut.