01 IntroductionCayman Mutual Fund is the hedge fund industry standard
If there is a “default” jurisdiction for open-ended strategies in the world of investment funds, it is the Cayman Islands. More than 12,700 Mutual Funds with a cumulative AUM of over $5 trillion. Cayman's share among global hedge funds is about 60%. And the main legal instrument for all these funds is the Cayman Mutual Fund under the Mutual Funds Act (2025 Revision).
Cayman Mutual Fund is not an “investment company” in the traditional sense. This is any open-ended a structure (Cayman ELP, Exempted Company, SPC or LLC) that accepts capital from investors, promises the opportunity to buy out their shares at NAV and invests pooled assets according to the announced strategy. "Open-ended" is the key word: investors can come in and out regularly, usually monthly or quarterly.
Mutual Fund is a legal regime, not a corporate form. The same ELP can be a Mutual Fund (if open-ended) or a Private Fund (if closed-ended). The choice is determined not by the type of entity, but by the nature of the investment strategy.
Main difference from Private Fund
Mutual Fund - open-ended: investors have the right to redemption (repurchase of their shares at NAV) on a regular basis. Private Fund - closed-ended: investors enter at the start and cannot request a redemption until the fund expires. Hedge funds - Mutual. PE/VC/RE - Private. This is a critical difference when structuring.
02 Mutual Funds Act 2025Legal framework and categories
The Mutual Funds Act has been in force since 1993 and has undergone several key revisions over 30+ years - the last in 2025. This law defines who is considered a "mutual fund", which funds must be registered with CIMA, and what compliance requirements must be met.
Any structure is considered a Mutual Fund if it:
- Issues equity interests (shares, units, partnership interests) to investors
- Pool their money for collective investment
- Provides possibility of redemption upon investor's request
The third point is key. If investors can demand the redemption of their shares at net asset value, this is a Mutual Fund. If redemption is only possible upon liquidation or special events, it is a Private Fund.
Four registration categories
MFA identifies four categories of Mutual Funds, and the compliance burden, minimum subscriptions and cost depend on the category:
- Section 4(3) Registered Mutual Fund - the most common category. Minimum subscription from $100,000 per investor. Requires CIMA registration, Big-4 audit, at least 2 directors with CIMA registration, MLRO. The vast majority of hedge funds operate in this mode.
- Section 4(1)(b) Administered Mutual Fund — the fund has a licensed administrator who takes on some of the compliance functions. Minimum subscription may be less than $100k. Standard for retail-oriented funds.
- Section 4(1)(a) Licensed Mutual Fund — the most “full-fledged” license for large public-facing funds. High requirements for directors, capital, ongoing supervision. Emerging managers are practically not used.
- Section 4(4) Limited Investor Fund (LIF) — simplified mode: up to 15 investors, with the majority having the right to appoint or change operator. Used for club-deals and family-style funds. Minimum subscription from $100k.
03 Key FeaturesWhat makes Cayman Mutual Fund an industry standard
3.1. Tax-neutral structure
The Mutual Fund itself does not pay taxes in the Caymans: 0% corporate tax, 0% capital gains, 0% withholding on distributions. Taxes (if any) are paid at the investor level in their jurisdiction of residence. This gives a huge advantage over domestic vehicles in High-tax jurisdictions, where fund-level taxation creates “double taxation”.
3.2. Flexible class structure
Mutual Fund can issue many interest classes with different characteristics: management fee, lockup, currency exposure, hedging policy. For example:
- Class A — USD-denominated, monthly liquidity, 2% management fee
- Class B — EUR-hedged, quarterly liquidity, 1.5% mgmt + 20% performance
- Class C — Founders' class for anchor LPs, 1% mgmt, no performance fee
- Class D — Long lockup (2 years), reduced fees
This flexibility is not available in most UCITS funds and is severely limited in US 1940 Act funds. Cayman Mutual Fund provides maximum customization for the specific needs of different categories of LPs.
3.3. NAV mechanics and redemptions
Standard open-ended mechanics: NAV (net asset value) is calculated by the administrator on the dealing day (usually the last business day of the month). Investors subscribe and redempt at this NAV. Lock-up periods (usually 1 year from the date of subscription), gates (limiting redemptions for large requests), side pockets (for illusory assets) - standard provisions for hedge funds.
3.4. Institutional recognition
Cayman Mutual Funds are recognized by prime brokers, custodians, AIFMD-managers as a standard category. KYC verification takes place in days, not weeks. This is an important operational advantage.
04 · Launch of Mutual Fund5 phases from idea to first subscription
Real time frame for launching a fully operational Mutual Fund - 3–5 months. The longest stages are coordination of PPM with anchor LPs and onboarding of the administrator with the bank.
Phase 1: Structuring (weeks 1–2)
At this stage it is determined:
- Legal form vehicle (ELP, Exempted Company, SPC, LLC)
- CIMA category (Registered, Administered, LIF)
- Master/Feeder structure (if US tax-exempt LPs are needed)
- Jurisdiction of feeder funds (Cayman + Delaware for US, Irish for AIFMD)
- Tax analysis for different categories of LPs
Phase 2. Fund documents (weeks 2–6)
Main documents:
- PPM (Private Placement Memorandum) — the main document for LPs. Describes strategy, fees, risks, governance. Typically 80–120 pages
- Subscription Agreement — what investors sign upon entry
- Investment Management Agreement - between fund and manager
- Operating Documents — LPA / Articles / Operating Agreement depending on the vehicle
- NAV Policy — methodology for calculating NAV
- Valuation Policy — assessment of illiquid and hard-to-value assets
- AML/CFT Policies - required for CIMA
Phase 3. Service providers (weeks 4–8)
In parallel with the preparation of documents, onboarded service providers are selected:
- Fund Administrator (Apex, MUFG, IQ-EQ, Citco) - NAV calculation, LP communications
- Custodian / Prime Broker (Goldman, JPM for traditional; Coinbase Custody, Fireblocks for crypto)
- Auditor - required Big-4 (PwC, KPMG, EY, Deloitte) for Registered Mutual Fund
- MLRO / DMLRO / AMLCO - all three positions must be appointed and approved by CIMA
- Independent Directors - minimum 2 with CIMA Director Registration
Phase 4. CIMA registration (weeks 6–12)
Submission to CIMA via REEFS-portal:
- Cover application form
- PPM and all marketing materials
- Constitutive documents (LPA / Articles)
- Director questionnaires and proof of CIMA registration
- Auditor letter of consent
- Administrator letter of consent
- MLRO/DMLRO/AMLCO appointment letters
The registration itself takes 5–7 business days after submission. The long part is preparing the package. Usually there are 1-2 rounds of RFI (request for information) from CIMA.
Phase 5. Banking and first close (weeks 8–16)
Opening a bank account (Cayman National, Butterfield, RBC, or international prime broker), onboarding the first LPs, first subscription. Since the first close fund has been officially operational.
- The structure is defined according to the character of LP-base
- PPM consistent with anchor LPs
- Service providers are subscribed and onboarded
- CIMA registration received
- Bank account opened
- AML procedures implemented
- First subscriptions received
- The first NAV calculation was carried out
05 Economics Mutual FundSetup costs and annual operating
Setup costs
- Legal preparation (PPM, IMA, fund formation): $35,000 – 70,000
- CIMA registration fee: $4,268
- Administrator setup: $15,000 – 25,000
- Auditor engagement: $5,000 – 10,000
- Banking introduction: $3,500 – 5,000
- Director appointments: $5,000 – 10,000
Total setup: $65 000 — 125 000 for a typical hedge fund.
Annual operating
- Administrator: $60,000 - 150,000 (depending on AUM, complexity, frequency NAV)
- Auditor (Big-4): $35,000 - 80,000 / year
- Independent directors (2): $24,000 – 48,000
- MLRO / DMLRO: $24,000 – 48,000
- CIMA annual fee: $4,268
- Legal annual: $20,000 – 50,000
- FATCA / CRS / CARF reporting: $5,000 – 15,000
Annual operating: $170,000 – 400,000 / year. This explains why Mutual Fund is economically viable from $20M+ AUM.
Fund Expense Calculator
06 · Four categories of MFAWhen to choose which one
Section 4(3) Registered Mutual Fund
The most popular category. Used for the vast majority of hedge funds. Minimum subscription $100,000 (or equivalent). Requires:
- CIMA registration via REEFS-portal
- Big-4 audit required
- Minimum 2 directors with CIMA Director Registration
- MLRO + DMLRO
- Annual filing + audited financial statements within 6 months after year-end
For emerging hedge fund managers this is the default choice. Min AUM for economics is $15-20M.
Section 4(1)(b) Administered Mutual Fund
The Fund has a licensed principal office (administrator), which undertakes substantive AML and compliance functions. The minimum subscription may be less than $100k (rarely used in practice).
Advantages: simplified CIMA process through a licensed admin. Disadvantages: less flexibility in choosing an administrator (only licensed in Cayman). In practice, this category is used less frequently Section 4(3).
Section 4(1)(a) Licensed Mutual Fund
The most difficult category. The fund itself receives a CIMA license (not just registration). Used for large public-facing structures, usually with a retail investor base.
Capital adequacy requirements, ongoing CIMA supervision, stricter corporate governance. In practice, it is used by large fund families. Emerging managers are practically not chosen.
Section 4(4) Limited Investor Fund
Introduced in 2020 as a “light” category. Up to 15 investors, with majority in terms of invested capital has the right to assign or change operator. Minimum subscription $100k.
Used for:
- Family / club deals (several families pool capital)
- Test runs new strategies before launching full Mutual Fund
- SPV-style structures for specific investments
Advantages: simplified registration, no Big-4 audit requirement, no 2 directors with CIMA registration. Min AUM for economics - from $3-5M is viable.
07 Mini caseLaunch of Crypto Mutual Fund $50M
Crypto-focused Mutual Fund for Institutional LPs
A management team of four people with experience in traditional hedge funds launched a crypto-focused open-ended fund. Strategy: long-only BTC + ETH with tactical hedging through perpetual swaps. Target AUM $200M, hard cap $400M, first close $50M.
Solution: Cayman ELP under Mutual Funds Act 4(3). Master/Feeder with Cayman master + Delaware LP feeder for US tax-exempt LPs (endowments, foundations). Service providers: IQ-EQ administrator, KPMG auditor, Coinbase Custody + Fireblocks. 3 directors (2 independent with CIMA registration). Standard 2/20 fees with 8% hurdle. Monthly subscriptions, quarterly redemptions, 1-year lockup.
08 ComparisonMutual Fund vs Private Fund vs Limited Investor Fund
| Parameter | Registered Mutual | Private Fund | Limited Investor Fund |
|---|---|---|---|
| Liquidity | Open-ended | Closed-ended | Open-ended |
| Strategy | Hedge/liquid | PE/VC/RE | Any |
| Min subscription | $100k | $100k+ (LP discretion) | $100k |
| Max investors | Unlimited | Unlimited | 15 |
| Big-4 audit | Required | Not necessary | Not necessary |
| CIMA directors required | 2 minimum | 2 minimum | 1 (simplified) |
| CIMA registration fee | $4 268 | $4 268 | $4 268 |
| Setup cost | $70-125k | $50-90k | $30-60k |
| Annual operating | $170-400k | $120-280k | $60-150k |
| Min viable AUM | $15-20M | $10-15M | $3-5M |
09 · Risks and nuancesWhat is important to understand before starting
9.1. PPM is a critical document
PPM is not a marketing brochure. This is a document that protects the manager from LP litigation. All material risks must be disclosed, all fees specified, all conflicts of interest mentioned. A poorly drafted PPM creates enormous legal risks.
Anchor LPs (especially institutional endowments, pension funds) carefully review PPM before subscription. Red flags (like “discretion to invest in any assets at any time”) raise questions and refusal. High-quality PPM requires serious legal work - do not use templates.
9.2. Substance requirements for GP
GP entity often falls under the Economic Substance Act as a “fund management business”. This requires:
- Adequate physical office on the islands
- Local employees or contracted personnel
- Real decision-making by directors on the islands (minimum one meeting per year)
- Costs for CIGA functions
In practice, many funds use a local management company with outsourced compliance - the cost starts from $30k/year. Without substance - ES non-compliance with fines and potential delisting.
9.3. AIFMD considerations for EU LPs
If a fund is marketed to EU investors, AIFMD may apply. This either requires AIFM authorization (via the Luxembourg/Ireland mirror structure) or restricts marketing to reverse solicitation. Cayman Mutual Fund itself does not have EU passporting - this must be taken into account in LP base planning.
9.4. US tax considerations
US-based LPs create complex tax issues: ECI (effectively connected income), UBTI (unrelated business taxable income) for tax-exempt entities, FIRPTA for real estate. Master/Feeder structures with Delaware LP feeder for US tax-exempt LPs - standard solution. US tax counsel review is required in the structuring phase.
9.5. CARF - new reporting mode
Since January 1, 2026, Cayman has implemented the Crypto-Asset Reporting Framework. Crypto Mutual Funds are subject to the automatic exchange of information with the tax authorities of the LPs’ countries of residence. This is a plus to the already working FATCA / CRS. Operational implication - updating KYC procedures for identifying crypto-related activities.
10 FAQThe most frequently asked questions about Mutual Fund
What is the minimum AUM for a viable Mutual Fund?
For Section 4(3) Registered Mutual Fund - realistically from $15-20M. With an AUM of $20M and a mgmt fee of 1.5%, income of $300k covers annual operating costs of $170-200k and leaves the manager with approximately $100k in operations. At AUM $50M+ economics become comfortable. For smaller AUMs, it makes sense to consider LIF (Section 4(4)) - available from $3-5M.
Can cryptocurrencies be accepted as a subscription?
Yes, but with reservations. Not all administrators support crypto subscriptions (specialized infrastructure is required). Most admins convert crypto to USD immediately upon receipt. Required advanced KYC: chain analysis (Chainalysis, Elliptic), source of crypto wealth, verification of wallets for sanctions/AML. Self-custody is usually not allowed - a third-party custodian is required.
Do I need a VASP license for a Crypto Mutual Fund?
No - a crypto fund under MFA is automatically exempt from the VASP Act if the crypto activity is incidental to the fund activity. That is, if you invest in crypto assets (including custody and trading) on behalf of fund, it does not require a VASP license. If the fund provides custody services to third parties or operates exchange - this is VASP territory.
How long does CIMA registration take?
The registration procedure itself after submission through REEFS takes 5–10 working days. In 60% of cases, CIMA issues an RFI (request for information), which adds 1–2 weeks for responses. Typically, the total time from submission to approval is 2–4 weeks. The long part of the whole process is preparation documents before submission (12–16 weeks).
Is it possible to change the fee structure after launch?
Existing LPs - only with their consent (usually a majority or supermajority is required). For new LPs - yes, through side letters or new classes. Many managers create a “founders' class” for the first LPs with reduced fees as an incentive for anchor commitment, and then an open standard class with rate-card fees. Changing the fee structure requires updating PPM and notification CIMA.
What are side letters and why are they?
A side letter is a separate agreement between a fund and a specific LP, giving this LP special rights (preferred fees, MFN clause, transparency rights, key person provisions, exit rights). Large institutional LPs almost always require side letters. This is standard practice, but requires careful drafting - a wrong side letter can create tax / regulatory issues for the entire fund.
11 ConclusionWhen Mutual Fund is the Right Choice
Cayman Mutual Fund is default structure for open-ended hedge funds. If your strategy involves regular subscriptions and redemptions (monthly, quarterly), and you invest in liquid assets (equities, FX, crypto, derivatives) - Mutual Fund is almost certainly the right choice.
Suitable if:
- Strategy - hedge / long-only / market-neutral / global macro / crypto / FX
- Assets are regularly liquid (NAV can be reasonably calculated each month)
- Do you want to accept LPs with exit option on a regular basis?
- Target AUM from $15-20M (for Section 4(3)) or from $3-5M (for LIF)
- LP base global (not only US or EU)
Not suitable if:
- Strategy - PE / VC / RE / private credit (then Private Fund)
- Assets illiquid / hard-to-value (closed-ended structure is better)
- Fund < $3M AUM (economics does not converge)
- Strict EU AIFMD passporting needed (mirror structure via Luxembourg)
Launching a Mutual Fund is a complex effort with many participants: lawyers, administrators, auditors, prime brokers, MLROs. The quality of each link affects the success of the entire project. We have participated in the formation of more than 250 Cayman funds since 2009 - from emerging manager $5M LIF to institutional $400M Section 4(3). A lawyer partner will analyze your strategy and propose the optimal structure at a free first meeting.