# EnerVest Energy Institutional Fund XII-B, L.P. — Form D/A

EnerVest Energy Institutional Fund XII-B, L.P. of HOUSTON, TX, a pooled investment fund, filed a Form D amendment with the SEC on 2010-10-07. $47.2M was reported sold. Industry: Pooled Investment Fund.

## Offering

- Filed: 2010-10-07
- Form: D/A
- Accession: 0001488626-10-000003
- Industry: Pooled Investment Fund
- Exemptions: 06, 3C, 3C.7
- Amount sold: $47.2M
- Investors: 13
- Date of first sale: 2010-05-07
- Security types: equity, fund interests
- SEC file number: 021-142201

## Issuer

- Name: EnerVest Energy Institutional Fund XII-B, L.P.
- CIK: 0001488626
- Entity type: Limited Partnership
- Jurisdiction: DELAWARE
- Incorporated: 2009
- Address: 1001 FANNIN, HOUSTON, TX, 77002
- Phone: (713) 659-3500

## Officers, directors & promoters (5)

| Name | Role | Location |
| --- | --- | --- |
| John Walker | Executive Officer | Birmingham, AL |
| N/A EnerVest, Ltd. | Executive Officer | Houston, TX |
| James Vanderhider | Executive Officer | Houston, TX |
| Mark Houser | Executive Officer | Houston, TX |
| N/A EnerVest Management GP, L.C. | Executive Officer | Houston, TX |

## Other filings by this issuer (4)

| Filed | Form | Offering | Sold |
| --- | --- | --- | --- |
| [2010-12-22](https://search.stillhousedata.com/formd/0001488626-10-000005) | D/A | — | $142.5M |
| [2010-11-03](https://search.stillhousedata.com/formd/0001488626-10-000004) | D/A | — | $109.2M |
| [2010-09-01](https://search.stillhousedata.com/formd/0001488626-10-000002) | D/A | — | $34.7M |
| [2010-05-18](https://search.stillhousedata.com/formd/0001488626-10-000001) | D | — | $37.7M |

## More

- [CIK 1488626 on SEC EDGAR (source of record)](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=1488626&type=&dateb=&owner=include&count=40)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/formd/0001488626-10-000003.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

---

Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.