For more information, see Tides Nexus
Tides Inc. (TINC) is a supporting nonprofit in the Tides Nexus, a collection of left-of-center pass-through and fiscal sponsorship nonprofits based in San Francisco, California. TINC operates an office space in San Francisco, Tides Converge (formerly the Thoreau Center for Sustainability), which rents office space to the other Tides organizations as well as a number of center-left nonprofits. TINC and Tides Converge are based in San Francisco’s historic Presidio grounds. 
Relationship to the Tides Nexus
TINC is one of a number of nonprofits created to support the primary groups in the Tides Nexus: the Tides Foundation, which provides grantmaking services; the Tides Center, which incubates new left-wing nonprofits; and the Tides Network, the controlling entity for the various Tides organizations. Specifically, TINC operates a San Francisco, California-based office space, which it rents to other nonprofits, including those in the Tides Nexus. TINC was formed in 2002. 
TINC describes its mission and primary program purpose as the following: 
Tides, Inc. operates Tides Converge in San Francisco (previously the Thoreau Center for Sustainability) (the “Facility”), which provides office space for the internal operations of [the] Tides Foundation and the Tides Center, and many other charitable and/or mission-aligned organizations, and provides opportunities for community-based meet-ups and connections.
It further describes its role in the Tides Nexus in relationship to an $8,500 grant it paid to the Presidio Trust in 2018, a government-controlled entity responsible for maintaining the historic Presidio grounds in San Francisco: 
Tides, Inc.’s primary activity is providing workspace, and [it] only makes a limited number of grants. . . . On certain occasions, it makes a few grants to pre-selected charitable organizations. The grant to the Presidio Trust was monitored via first hand observation as the organization [TINC] is domiciled in the Presidio where the shuttle operations (which was the purpose of the grant) takes place.
In its 2018 Form 990, TINC’s board of directors included the following individuals (some of whom have since left Tides altogether): 
- Kriss Deiglmeier (board chair): former Tides CEO
- Judith Hill (board treasurer, CFO)
- Amanda Keton: former Tides general counsel, former Tides Advocacy managing director
- David Schrayer
- Kim Sarnecki (through October 2018)
- Jennifer Marie Landig: assistant secretary
Tides Inc. is a 501(c)(3) nonprofit.
In 2018, TINC reported total revenues of $3.7 million, total expenditures of $3.5 million, and net assets of just under $2 million. 
The 2018 IRS Form 990 tax filing for Tides Inc. is archived here.