PE Firm · Capital Allocator
Firm Overview
50
Portfolio tracked
0
Sectors
0
Regions
11/9/2026
Last verified
Growth-stage technology investment firm founded by Dick Costolo and Adam Bain.
Leadership
Dick Costolo
Managing Partner & Founder
Dick Costolo is a Managing Partner at 01 Advisors and the former CEO of Twitter.
Adam Bain
Managing Partner & Founder
Adam Bain is a Managing Partner at 01 Advisors and the former COO of Twitter.
David George
General Partner
David George is a General Partner at 01 Advisors, previously serving as a Partner at a16z.
Portfolio on record
Portfolio by sector
- Unclassified36 of 50
- B2B Software11 of 50
- Financial Services2 of 50
- Industrials1 of 50
50 portfolio companies on record in the index, grouped by sector hub.
Current and exited
Current: 47 of 50Exited: 3 of 50
Portfolio size among all firms
50 companies on record, more than 64% of the 405 firms in the index.
0885 companies (log scale)
Portfolio Companies
| Company | Sector | Status | Website |
|---|---|---|---|
| Airtable | Not on record | Current | Visit ↗ |
 Arena | Not on record | Current | Visit ↗ |
 Atlas Card | Not on record | Current | Visit ↗ |
| Attio | Not on record | Current | Visit ↗ |
 Baseten | Not on record | Current | Visit ↗ |
| bitdrift | Not on record | Current | Visit ↗ |
| BrightHire | Not on record | Exited | Visit ↗ |
 BuildOps | Not on record | Current | Visit ↗ |
| Capchase | Not on record | Current | Visit ↗ |
| Cape | Not on record | Current | Visit ↗ |
| cape cape | Not on record | Current | Visit ↗ |
| Certn | Not on record | Current | Visit ↗ |
| Collectors | Not on record | Current | Visit ↗ |
| Common Room | Not on record | Current | Visit ↗ |
| Copy of Siro | Not on record | Current | Visit ↗ |
| Crosby | Not on record | Current | Visit ↗ |
 Density | Not on record | Current | Visit ↗ |
 Electric | Not on record | Current | Visit ↗ |
 Fractile | Not on record | Current | Visit ↗ |
| Future | Not on record | Current | Visit ↗ |
| Haus | Not on record | Current | Visit ↗ |
 HiveWatch | Not on record | Current | Visit ↗ |
 HoneyBook | Not on record | Current | Visit ↗ |
 Laurel | Not on record | Current | Visit ↗ |
| Levelpath | Not on record | Current | Visit ↗ |
| Linear | Not on record | Current | Visit ↗ |
| MasterClass | Not on record | Current | Visit ↗ |
| Metropolis | Not on record | Current | Visit ↗ |
| Micro1 | Not on record | Current | Visit ↗ |
| Modern Health | Not on record | Current | Visit ↗ |
| Navan | Not on record | Current | Visit ↗ |
| Observe.ai | Not on record | Current | Visit ↗ |
| Opendoor | Not on record | Exited | Visit ↗ |
| Origin | Not on record | Current | Visit ↗ |
| Papaya | Not on record | Current | Visit ↗ |
| Pierre | Not on record | Current | Visit ↗ |
| Postscript | Not on record | Current | Visit ↗ |
| Protect AI | Not on record | Current | Visit ↗ |
| Protect by Palo Alto | Not on record | Current | Visit ↗ |
| Render | Not on record | Current | Visit ↗ |
 Rho | Not on record | Current | Visit ↗ |
| SiteRx | Not on record | Current | Visit ↗ |
| Split | Not on record | Exited | Visit ↗ |
| SpotOn | Not on record | Current | Visit ↗ |
 Stream | Not on record | Current | Visit ↗ |
| Sublime | Not on record | Current | Visit ↗ |
| Sublime Security | Not on record | Current | Visit ↗ |
| Tipalti | Not on record | Current | Visit ↗ |
| Transcend | Not on record | Current | Visit ↗ |
 Wheelhouse | Not on record | Current | Visit ↗ |
Source: https://01a.com/portfolio
Firms that also back 01 Advisors' companies
Co-investor web
Line width shows shared portfolio companies on record in the index. Top 8 co-investors shown.
Andreessen Horowitz4 shared companies
Quiet Capital3 shared companies
Accel-KKR1 shared company
Battery Ventures1 shared company
CapitalG1 shared company
DCVC1 shared company
Energy Impact Partners1 shared company
Evolution Equity Partners1 shared company
Questions about 01 Advisors
- How many portfolio companies does 01 Advisors have?
- PE Firm Index tracks 87 50 Advisors portfolio companies from the firm's public portfolio page, as of 2026-10-26. The firm's own count may differ, for example where exited companies are listed.
- Who leads 01 Advisors?
- Public sources name Dick Costolo (Managing Partner), Adam Bain (Managing Partner) and David George (Managing Partner) among 01 Advisors's leadership.
Elsewhere in our directories
- Observe.ai on Top Analytics ToolsObserve.ai, a 01 Advisors portfolio company, in our analytics tools directory.
These directories share an owner with PE Firm Index. See About.
Sources for this profile, updated 2026-10-26
This profile is based on publicly available information and may be incomplete or outdated. PE Firm Index is not affiliated with 01 Advisors and does not provide investment advice.
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