Aspen’s 51 Upstream Energy Fund VII review: experienced oil and gas managers, very ambitious projections
Aspen Funds presents this diversified oil and gas fund, managed with Naphtali Energy and the Mohajir family’s energy team, targeting 25–35% IRR from producing wells and new drilling. We reviewed the filing, the managers’ history and the numbers behind the pitch.
An established sponsor paired with energy managers who have decades of operating history, a prior fund reporting 15% distributions in 2025, and strong early investor feedback. But the 25–35% IRR and 4–7x projections are aggressive, fund size figures vary, many investors enter through feeder funds that add fees, and the marketing understates operating risk.
What the fund is
51 Upstream Energy Fund VII, marketed as Aspen Oil and Gas, is a diversified oil and gas fund presented by Aspen Funds. It combines existing producing wells for current cash flow with acreage for new drilling for upside, across multiple U.S. basins.
The fund invests mainly through non-operated working interests, which are shares of the costs and revenue of wells run by other companies, and overriding royalty interests, which are shares of production revenue without the drilling costs. Its legal documents describe the objective as investing in non-operated producing oil and gas assets, including oil, dry natural gas and natural gas liquids.
The fund closed to new investors on September 1, 2025, according to its Invest Clearly listing. This review is relevant for existing investors, and for anyone considering a future Aspen energy fund built on the same approach.
As a private placement, the fund’s full terms and financials are provided in its offering documents. This review lists what to request rather than treating unpublished detail as a weakness.
Who runs it
Three parties are involved, and investors should understand each one’s role:
- Aspen Funds, the Kansas-based sponsor led by Ben and Bob Fraser, presents the fund and is named among its initial members. We reviewed Aspen separately for its Aspen Legacy Fund, and found a clean record.
- Naphtali Energy, LLC is described in fund materials as the sponsor of the offering and is named in the SEC filing as the issuer’s manager.
- Mohajir Energy Advisors, led by members of the Mohajir family, partners with Aspen on the fund’s energy expertise.
The legal documents describe Mohajir and Robert C. Behner as having managed energy companies together for many years, including KLT Gas, where they oversaw about $90 million of capital investment and a sale of assets for $250 million, and Genesis Gas & Oil. Aspen describes Behner as an oil and gas veteran with 32 years across exploration and operations.
The legal documents also note that the managers run a sister vehicle, 116 Upstream Energy Fund VI, with similar strategies, and that the two funds may compete for the same investments.
SEC filing
51 Upstream Energy Fund VII, LLC filed a Form D with the SEC in March 2025, reporting a $100 million offering, a first sale on February 20, 2025, and $2,558,500 sold at the time of filing. It was signed by Robert Behner, as Executive Vice President of Naphtali Energy, LLC, the issuer’s manager.
Terms
- Target return: 25–35% IRR.
- Projected equity multiple: 4–7x, according to Aspen’s fund page.
- Hold period: 7 to 10 years.
- Fund size: described as $75 million or more in the investor deck, $67 million on Aspen’s fund page, and $100 million in the SEC filing.
- Tax treatment: marketed as tax-advantaged, through deductions available to working interest owners.
- Access: some investors entered through pooled feeder vehicles, such as CGC Power House 01 LLC, Turbine Capital and Mission Capital, which offer lower minimums but typically add their own fees.
Track record
Aspen’s energy page reports that the prior fund, Upstream Energy Fund VI, has $41 million of invested capital, a 15% distribution yield in 2025 and active quarterly distributions. Fund VII’s strategy is described as building directly on that playbook. Aspen’s earlier energy offerings also included a $50 million Energy Fund VI and the Riverdance Energy Fund, a single producing field.
Invest Clearly’s track record panel for Aspen shows 5 exits with an average IRR of 25% and a 7x equity multiple, without specifying which investments those figures cover. In a public deal review, a panel of experienced passive investors pressed Aspen on which funds had not yet returned capital and what its worst deal had been, questions every investor should ask.
Claims versus records
| Claim | Source | Status | What we found |
|---|---|---|---|
| 25–35% IRR and 4–7x equity multiple | Aspen fund page | Aggressive projection | Far above typical private fund targets; depends heavily on drilling results and oil prices |
| Energy upside “without operational risk” | Aspen marketing | Overstated | Non-operated working interests still carry well performance, cost and operator risk |
| Fund VI: 15% 2025 distribution yield | Aspen energy page | Self-reported | Consistent with investor testimonials |
| Fund size | Deck, Aspen page, Form D | Varies | $67M, $75M+ and $100M |
| Managers’ $250M KLT Gas sale | Fund legal documents | Self-reported | Historical; ask for documentation |
Key risks
- Commodity prices: returns depend on oil and gas prices, which the fund’s own documents note may fall for long periods.
- Drilling results: the upside depends on new wells performing as projected, and reserve estimates are inherently uncertain.
- Working interest costs: working interest owners share drilling and operating costs, which can rise.
- Layered structure: three management parties, plus feeder funds for many investors, can mean several layers of fees.
- Conflicts: the managers run a sister fund that may compete for the same deals.
- Illiquidity: a 7 to 10 year hold with no regular redemptions.
What investors say
Positive
- Invest Clearly shows a 5.0 rating from 7 reviews for the fund.
- Aspen testimonials describe investors new to oil and gas finding the approach sound and being pleased with returns so far, and one capital raiser reports a fund ahead of its projected timeline by nine months.
Concerns
- An Invest Clearly reviewer who invested through Turbine Capital said it was still too early to judge the oil and gas fund’s results.
- Most published feedback comes from Aspen’s own marketing.
We found no complaints, lawsuits or regulatory actions involving Aspen Funds, Naphtali Energy, Mohajir Energy Advisors or Robert Behner.
Strengths and concerns
Strengths
- An established sponsor with a clean record.
- Energy managers with decades of operating history and past exits.
- A prior fund reporting strong 2025 distributions.
- Diversification across operators and basins, with royalty interests that do not bear drilling costs.
- Strong early investor feedback.
Concerns
- Very high return and multiple projections.
- Marketing that downplays operating risk.
- Fund size figures that vary across materials.
- A multi-party structure and feeder funds that add fees and complexity.
- A sister fund that may compete for the same deals.
Who it suits
Possible fit: high-income accredited investors who want oil and gas exposure and tax benefits, can hold for 7 to 10 years, and treat the projections as an optimistic scenario.
Think carefully: investors relying on the 4–7x projection or the idea that energy investing here is free of operational risk.
Questions to ask the sponsor
- What are the exact roles and fees of Aspen Funds, Naphtali Energy and Mohajir Energy Advisors?
- If investing through a feeder fund, what does the feeder charge on top?
- What are Fund VI’s actual cumulative distributions and current value against its original projections?
- Which five exits make up the 25% average IRR shown on Invest Clearly?
- How are investments allocated between Fund VII and the sister Fund VI?
- Can the fund call more capital for drilling cost overruns?
What would change our verdict
- Audited results for Fund VI and prior energy funds;
- a clear, single fee schedule across all parties;
- marketing that reflects operating and commodity risk;
- Fund VII performance data over several years.
What to request in the offering documents
- The private placement memorandum and operating agreement.
- The fee schedule for each party, including any feeder fund.
- Reserve reports for the fund’s producing assets.
- Fund VI quarterly reports and distribution history.
- The allocation policy between Fund VI and Fund VII.
Verdict history
October 15, 2026 · Initial review · Mixed (6.3)
Sources
- Upstream Energy Fund VII (Aspen Funds)
- UEF VII for Best Ever subscribers (Aspen Funds)
- Energy Fund VI (Aspen Funds)
- Riverdance Energy Fund (Aspen Funds)
- Form D, 51 Upstream Energy Fund VII (March 2025)
- 51 Upstream Energy Fund VII legal package
- 51 Upstream Energy Fund VII investor deck
- CGC Power House 01 with Aspen Funds presentation (feeder fund)
- Upstream Energy Fund VII data room (Mission Capital)
- Aspen Funds investor reviews (Invest Clearly)
- LP Deal Review: Aspen Funds, 51 Upstream Energy Fund VII (PassivePockets)
About this review
Investors Verdict is independent. We have no affiliate, referral or business relationship with Aspen Funds, Naphtali Energy or Mohajir Energy Advisors or any company mentioned, and no payment of any kind affects our verdicts.
This review is based on public records, court filings, news reports, company materials and published sources as of the date shown. Claims and allegations are attributed to their source. Verdicts and scores are our opinion based on the facts disclosed above, using our published review method. This review is not financial, legal or investment advice.