Fund Structure
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Quick Answer
A supplemental fund raised alongside or after a main fund to invest exclusively in follow-on rounds of the main fund's portfolio companies, providing additional reserves.
An Annex Fund (also called an opportunity fund or growth fund) is a supplemental investment vehicle raised by a GP alongside or subsequent to their main fund, specifically designed to make larger follow-on investments in the main fund's most successful portfolio companies. The annex fund allows the GP to maintain or increase ownership in breakout companies without depleting the main fund's reserves. Annex funds are typically larger than the main fund's follow-on allocation and invest only in companies already in the main fund's portfolio. They often have modified economics—reduced management fees and sometimes lower carry—since the GP is investing in known quantities rather than sourcing new deals. LPs in the main fund usually receive priority access to the annex fund. The structure has become popular among seed and early-stage funds that identify winners requiring significantly more follow-on capital than the main fund can provide.
In Practice
A $75 million seed fund's best portfolio company is raising a $50 million Series B. The main fund can only invest $3 million from reserves (hitting concentration limits), but the GP wants to invest $10 million to maintain their board seat and ownership position. The GP raises a $50 million annex fund, charging 1% management fee and 15% carry (reduced from the main fund's 2/20). The annex fund invests $10 million alongside the main fund's $3 million, securing the GP's position in their top performer.
Why It Matters
Annex funds solve the structural problem of seed and early-stage funds having insufficient reserves for later-stage follow-on rounds. For founders, annex funds signal that their VC has the capacity to continue supporting them through growth stages. For LPs, they offer fee-efficient access to the GP's highest-conviction follow-on opportunities.
VC Beast Take
Annex funds have exploded in popularity as VCs realize that initial check sizes often underrepresent their best opportunities. The structure lets GPs double down on winners without cannibalizing their ability to make new investments from the main fund. However, LPs are getting pickier about annex fund terms since GPs essentially get two bites at the apple with their best companies. Expect to see more creative structures like opportunity funds that blend new investments with follow-ons.
An Annex Fund (also called an opportunity fund or growth fund) is a supplemental investment vehicle raised by a GP alongside or subsequent to their main fund, specifically designed to make larger follow-on investments in the main fund's most successful portfolio companies.
Understanding Annex Fund is critical for founders navigating the fundraising process. It directly impacts deal terms, valuation, and the relationship between founders and investors.
Annex Fund falls under the fund-structure category in venture capital. This area covers concepts related to how venture capital funds are organized, managed, and governed.
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