Independent Verdict
MFO Fund, L.P. is a newly formed Delaware venture capital fund with a verifiable SEC Form D filing and a strong public connection to Mayfield.
The fund operates under CIK 0002155144 and filed its first Form D on September 18, 2026.
The filing identifies:
MFO Fund, L.P.
MFO Fund Mgmt, L.L.C.
Navin Chaddha
2484 Sand Hill Road, Menlo Park, California
and telephone number 650-854-5560.
Those details are particularly important because the Form D itself does not use the Mayfield name.
However, 2484 Sand Hill Road and the same telephone number have been repeatedly used in SEC filings for Mayfield investment funds, while Mayfield's official website identifies Navin Chaddha as its Managing Partner.
That creates a strong regulatory and public-record connection between MFO Fund and the broader Mayfield venture capital platform.
At the time of the filing, the fund had not yet reported a first investor.
The Form D states:
Total Amount Sold: $0
Investors: 0
First Sale: Yet to Occur
Offering Amount: Indefinite
This makes MFO Fund particularly useful as a launch-stage fund review rather than a retrospective fundraising analysis.
Key Findings
Issuer: MFO Fund, L.P.
CIK: 0002155144
SEC File No.: 021-598007
Entity Type: Limited Partnership
Jurisdiction: Delaware
Formation Year: 2026
Filing Date: September 18, 2026
Filing Type: New Form D
Fund Type: Venture Capital Fund
Federal Exemption: Rule 506(b)
Investment Company Act Exclusion: Section 3(c)(7)
Offering Amount: Indefinite
Amount Sold: $0
Investors: 0
First Sale: Yet to Occur
Minimum Investment Field: $0
Sales Commissions: $0
Finder's Fees: $0
General Partner: MFO Fund Mgmt, L.L.C.
Key Person: Navin Chaddha
Principal Address:
2484 Sand Hill Road Menlo Park, California 94025
Phone:
650-854-5560
Official Platform Website:
mayfield.com
The Mayfield Connection Is Strong
The most interesting part of MFO Fund is that the legal fund name does not immediately tell a searcher who is behind it.
A person searching only:
MFO Fund
could easily miss the relationship.
The Form D provides the necessary clues.
It identifies Navin Chaddha as a member of the general partner.
It also uses:
2484 Sand Hill Road Menlo Park, California 94025
and:
650-854-5560.
These same contact details appear repeatedly in SEC filings for established Mayfield funds.
For example, Mayfield XVII and Mayfield Select III use the same 2484 Sand Hill Road address and the same 650-854-5560 telephone number.
Those filings also identify Navin Chaddha in the related-person section.
Mayfield's official website independently identifies Navin Chaddha as its Managing Partner.
Taken together, the evidence strongly supports the conclusion that MFO Fund belongs to the broader Mayfield investment ecosystem.
For FilingDossier, this is a good example of why fund research should not rely only on the legal issuer name.
Address, phone, general partner and key-person matching can reveal the actual sponsor relationship.
Why the Name MFO Matters
The SEC filing identifies the general partner as:
MFO Fund Mgmt, L.L.C.
But it does not explain what "MFO" stands for.
FilingDossier would therefore not invent an expansion of the abbreviation.
It may represent an internal Mayfield fund designation, a dedicated investment strategy or another organizational label.
Until Mayfield or the fund documents explain the acronym, the correct treatment is simply:
MFO Fund, L.P.
This is preferable to creating an unsupported interpretation for SEO purposes.
A New Venture Capital Fund
The Form D classifies MFO Fund as:
Venture Capital Fund.
That gives us a stronger strategy signal than the fund name itself.
The issuer also relies on:
Section 3(c)(7)
of the Investment Company Act.
That structure is commonly used by private funds whose investors meet qualified purchaser requirements.
The fund also relies on:
Rule 506(b)
rather than Rule 506(c).
This means the offering is structured as a private placement rather than a generally solicited public marketing campaign.
The filing further states that the offering is not expected to continue for more than one year.
That is another useful difference from evergreen or continuously offered vehicles.
MFO Fund Was Still Pre-Sale at Filing
The strongest timing fact is:
First Sale Yet to Occur.
The fund reported:
$0 sold
and:
0 investors.
This does not mean the fundraising failed.
It means the Form D captured the vehicle before its first reported sale.
That distinction is essential.
The September 18 filing should be treated as a launch-stage regulatory notice.
Future amendments may later show the first close, investor count and amount raised.
For FilingDossier, this creates a useful monitoring opportunity.
The original filing provides a clean baseline of zero.
The next Form D amendment can show exactly how the fundraising developed.
Mayfield Provides Important Sponsor Context
Mayfield is a longstanding Silicon Valley venture capital firm.
Its official website identifies Navin Chaddha as Managing Partner and describes a long history of early-stage technology investing.
Mayfield has historically invested across enterprise technology, consumer companies, semiconductors, AI and related technology sectors.
Its official materials also show investments associated with companies such as Lyft, HashiCorp and Poshmark.
This gives MFO Fund substantial sponsor context.
However, sponsor history should not be confused with MFO Fund performance.
MFO Fund was formed only in 2026.
The performance of earlier Mayfield funds or individual portfolio companies does not automatically establish the future performance of MFO Fund.
That distinction is particularly important for a newly launched vehicle with no reported investors at the initial filing date.
The $0 Minimum Investment Field Needs Careful Interpretation
The Form D reports:
Minimum Investment Accepted: $0.
This should not be interpreted as meaning anyone can invest with no minimum.
The fund relies on Section 3(c)(7), which generally points toward qualified purchaser investors.
Actual commitment minimums may also be established in the limited partnership agreement, subscription documents or side letters rather than the Form D minimum-investment field.
Therefore, the accurate statement is:
The Form D reports a $0 minimum investment field.
It would be inaccurate to write:
MFO Fund has no investment minimum.
Investors should verify the actual commitment requirement directly from the offering documents.
Why This Fund Is Google-Friendly
MFO Fund has a useful search problem.
The legal issuer name is very short and does not contain:
Mayfield
Navin Chaddha
venture capital
or Sand Hill Road.
That means a basic Form D database page may provide very little context.
A properly researched page can connect:
MFO Fund
CIK 0002155144
MFO Fund Mgmt
Navin Chaddha
2484 Sand Hill Road
Mayfield
and:
Venture Capital Fund.
Those entity relationships create substantially more useful search content than simply reproducing the SEC filing.
What We Think
MFO Fund has a strong sponsor-verification profile despite its low-profile legal name.
The strongest evidence is the combination of:
Navin Chaddha
2484 Sand Hill Road
650-854-5560
MFO Fund Mgmt, L.L.C.
and repeated historical Mayfield SEC filings using the same operating location.
Mayfield's official website independently confirms Chaddha's leadership role.
This makes the Mayfield connection much stronger than a speculative name match.
The unresolved questions are mostly investment-related rather than identity-related.
The Form D does not disclose:
Target fund size
Specific investment sectors
Portfolio companies
Fund term
Management fee
Carried interest
Investment committee
First-close target
or final commitment minimum.
Those details will need to come from the private placement memorandum and fund partnership documents.
What Investors Should Verify
Before investing, investors should confirm:
Exact relationship between MFO Fund and Mayfield
Ownership of MFO Fund Mgmt, L.L.C.
Full investment strategy
Target fund size
Expected first close
Actual minimum commitment
Management fee
Carried interest
Fund term
Investment period
Key-person provisions
Investment committee members
Portfolio allocation policy
Relationship with other active Mayfield funds
Allocation of investment opportunities
Valuation policy
Fund administrator
Auditor
Custodian
Current amount raised after the September 18 filing
Risk Factors
New Fund Risk
MFO Fund was formed in 2026 and had no reported investors at the initial filing date.
Strategy Disclosure Risk
The SEC filing identifies a venture capital fund but provides little detail about the specific investment mandate.
Illiquidity
Venture capital investments may remain private for many years.
Private Company Valuation Risk
Portfolio investments may not have readily observable market prices.
Fund-Family Allocation Risk
Mayfield operates multiple investment vehicles. Investors should understand how attractive opportunities are allocated among funds.
Key-Person Risk
Navin Chaddha is directly connected to the general partner in the SEC filing.
Fundraising Uncertainty
The initial Form D reports zero dollars sold and zero investors.
Qualified Purchaser Structure
Section 3(c)(7) generally places the vehicle in a sophisticated private investor category.
Form D Is Not SEC Approval
The Form D confirms an exempt securities offering notice.
It does not mean the SEC approved MFO Fund, Mayfield, Navin Chaddha, the investment strategy or future returns.
Final Assessment
MFO Fund, L.P. is a verifiable Delaware venture capital fund operating under SEC CIK 0002155144.
Its September 18, 2026 Form D reports:
Rule 506(b)
Section 3(c)(7)
Venture Capital Fund classification
an indefinite offering
$0 sold
0 investors
and:
First Sale Yet to Occur.
The fund identifies MFO Fund Mgmt, L.L.C. as general partner and Navin Chaddha as a member of that general partner.
The issuer also uses 2484 Sand Hill Road in Menlo Park and telephone number 650-854-5560.
Those same contact details appear in historical SEC filings for Mayfield funds, while Mayfield's official website identifies Navin Chaddha as Managing Partner.
For FilingDossier, this creates a strong evidence-based connection between the otherwise low-profile MFO Fund name and the Mayfield venture capital platform.
The main uncertainty is therefore not sponsor identity.
It is the economics and strategy of the new fund.
Before investing, investors should review the private placement memorandum, limited partnership agreement, general partner ownership structure, investment mandate, management fee, carried interest, fund term, investment committee, allocation policy and current fundraising status.
SEC Form D is a notice filing for an exempt securities offering. It does not constitute SEC approval, endorsement of Mayfield or Navin Chaddha, verification of future portfolio performance or a guarantee of investor returns.
Published on FilingDossier: September 20, 2026.
This article is based on publicly available regulatory and company information and is provided for independent research and due-diligence purposes only.