ChatGPT creator Sam Altman invested in dozens companies over the years – from Reddit’s Neuralink to Elon Musk’s Neuralink.

According to PitchBook, Altman was listed as an investor in Neuralink’s Series C round of 2021 in July 2021.

Neuralink, Elon Musk's company, is currently developing technology in the hopes of implanting it in a human mind to record and stimulate activity. The company was founded by Musk in 2016. However, it wasn't made public until 2017, when The Wall Street Journal published a report.

The company has shown its technology in pigs and monkeys.

According to PitchBook, Altman was listed as an investor during Lattice’s May 2016 seed round.

Altman's brother Jack Altman founded Lattice and leads it. It is an employee management platform that allows people teams from different companies to improve their performance, engagement, goal-setting, and overall productivity.

According to PitchBook, Altman invested in Instacart's Series B round in June 2014 and its Series C round December 2014.

Instacart delivers and picks up groceries from different stores and connects users with personal shoppers who can do their grocery shopping. Apoorva Mehta and Brandon Leonardo founded the company. Max Mullen also co-founded it.

According to PitchBook, Altman was the leader of Reddit's Series A round which saw the company raise $50 million. Altman also invested in Reddit’s Series C round in July 2017.

Reddit allows users to discuss and share news, and allow them to vote. It was part of the same Y Combinator batch that Loopt, Altman’s first startup. Reddit was created by Aaron Swartz, Alexis Ohanian and Steve Huffman. Altman was a member of Reddit's board for seven years and then resigned in January 2022.

According to PitchBook, Altman was listed as an investor in Patreon’s Series A round of June 2014.

Patreon allows content creators to make money by selling subscriptions to their followers. A subscription gives creators' fans access to exclusive content. Jack Conte is the current CEO of Patreon.

According to PitchBook, Y Combinator made a $1 million investment in Helion Energy's Series B round in July 2014. Altman was the leader of the company's Series E round, which saw $375 million invested in the fusion energy company. According to PitchBook, Helion Energy raised $500 Million in this round.

Helion Energy transforms hydrogen into helium-3. It claims that this is the "ideal fuel for fusion electricity".

Altman stated in an interview that Helion was "more than an investment for me" and that he has spent "a lot" of time on Helion as he is "super excited about the future."

Helion Energy was started by Chris Pihl and David Kirtley.

According to PitchBook Altman was the leader of Asana's Series C round, which saw the company raise $50 million. Altman also invested in Asana's Series D round, which was held in January 2018. Since then, Asana went public.

Asana is a platform for managing work teams with automated lists and timelines. Justin Rosenstein founded the company, while Dustin Moskovitz is the current CEO.

According to PitchBook, Altman is listed as an Investor in Change.org's Series C round of December 2014 and in a Series B round in May 2017.

Change.org allows individuals and organizations to create petitions that can be signed and supported by people all over the globe.

Ben Rattray, Mark Dimas and Mark Dimas founded the company.

Rescale is a cloud-based platform that allows engineers and computational scientists from industries such as aerospace and energy to create and run simulations.

According to PitchBook, Altman was involved in the venture four times. According to PitchBook, Altman was listed as an investor in the seed rounds of March 2012 and July 2015. He also invested in its Series A round in December 2018 and its Series C round November 2021.

Joris Poort, Adam McKenzie and Adam McKenzie founded Rescale.

Crunchbase reports that Altman invested in Codecademy's Series B round in October 2011.

Codecademy is an online platform that offers free coding classes. There are classes available for 12 programming languages, including Python, JavaScript and SQL.

Ryan Bubinski was the founder and Zach Sims is the current CEO.

According to PitchBook, Altman was involved in the November 2022 and October 2020 seed rounds of Rewind.

Rewind, an AI-powered search engine, records everything you've seen or heard to make it easier for you to search on your computer.

Brett Bejcek, Dan Siroker and Dan Siroker founded the company.

Altman invested in Rain Neuromorphics Series A-2, A-3 rounds in Jan 2021 and Series A1 rounds in January 2022.

Rain Neuromorphics creates artificial brains that enable advanced artificial intelligence development.

Jack Kendall, Juan Nino and Gordon Wilson founded the company. Wilson is currently the CEO.

According to PitchBook, Altman was an investor in Atmos' seed rounds of June 2019 and October 2020. Altman is also listed as an investor for the Series A round of Atmos in November 2022.

Atmos is a company that assists people in building their dream home while staying within their budget. It was started by Austin Kahn and Matthew Rastovac. Trent Hedge and Nicholas Donahue are currently its CEO.

According to PitchBook, Altman was an investor in Coco's seed round, in November 2020. He also participated in the Series A round, in February 2022. According to PitchBook, Coco raised $56 Million in its Series A round.

Coco is a robot-based delivery service that delivers food and other goods to customers. It was started by Zach Rash, who currently serves as the CEO.

According to PitchBook, Altman invested in ZeroDown’s Series A round in June 2019 and ZeroDown's Seed round in March 2019.

ZeroDown is an online lending company that purchases homes for its customers. It offers a cash offer and then gives customers the opportunity to purchase the house back within five years, plus interest.

It was founded by Lakshminarasimhan Raghavan, and Abhijeet Daivedi, who are currently its CEO.

According to PitchBook, Altman was one of the lead investors in TrueNorth's Series B round in December 2021. In its Series B round, the company raised $50 Million.

TrueNorth is a platform that helps truckers and owners of small trucks manage their businesses from one place. It also has a mission: to make truckers more money. Jin Stedge is the CEO and Sanjaya Wijeratne founded it.

According to PitchBook, Altman was the lead investor in Brinc’s Series A1 round of financing in October 2020. According to PitchBook, the company raised $2.2million in its Series A1. Altman also invested in the Series A round in April 2021.

According to Brinc's website, Brinc was established "in response to" the 2017 Las Vegas shooting. The company uses drones and other technology to "benefit the community and save lives." Blake Resnick, the CEO, founded it.

According to PitchBook, Altman invested in Campuswire’s Series A round in January 2022 and Campuswire’s seed round of July 2021.

Campuswire allows university students to view announcements and participate in discussions online. They can also ask questions about their classes. It was started by Tade Oyerinde, the CEO.

FarmLogs provides farm owners with data-driven insights that allow them to manage their day and sell profitable crops. According to PitchBook, the company was founded by Jesse Vollmar and Mark Kvamme.

According to PitchBook, Altman invested in FarmLogs Series B round in December 2014. And its Series C round of January 2017. Software company Bushel acquired FarmLogs in 2021.

According to PitchBook, Altman invested in HelixNano's seed rounds in December 2016 as well as March 2020. The Series A round was then purchased by Altman in March 2022.

HelixNano's focus is on using mRNA in order to impact issues such as COVID-19 and the environment. It was founded in 2005 by Hannu Rajaniemi and Nikolai Eroshenko, who are also its CEO.

According to PitchBook, Altman was among the leading investors in Humane’s Series A round in September 2020. This round saw the company raise $30 million. He also invested in the Series B round of the company's July 2021.

Humane is a hardware-software company that creates products that help people develop innovative technology. It was started by former employees of Apple, Imran Chaudhri, and Bethany Bongiorno.

According to PitchBook, Altman invested in Journey Colab’s seed round in 2020 and its Series A1 round 2021.

Journey Colab, a biopharmaceutical firm, focuses on developing and distributing psychedelic treatments for addictions. Jeeshan Chowdhury is the founder.

According to PitchBook, Altman invested in Meter’s Series A round in Oct 2020 and its Series B round, May 2023.

Meter is an internet infrastructure company that provides enterprise-grade services for businesses. It was started by Sunil Varanasi (brother) and Anil Varanasi (CEO).

According to PitchBook, Altman was a shareholder in Science Exchange's Series A round of April 2013 and in its Series B round of March 2016.

Science Exchange is an online R&D market that facilitates outsourcing research and development services between scientists. It was started by Elizabeth Iorns, and Dan Knox.

According to PitchBook, Altman invested in TrialSpark’s Series B round in Oct 2018, and its Series C round September 2021.

TrialSpark, a biotech platform, accelerates the time of clinical trials by using data and automation so that patients receive treatment more quickly. Ben Liu and Linhao Zhang founded it.

According to PitchBook, Altman invested in Nautilus Labs’ seed round in February 2019.

Nautilus Labs employs AI to increase ocean commerce efficiency.