Best SPV Platforms for Angel Syndicates & VC Co-Investments

AngelList remains the dominant SPV platform for angel syndicates in 2026, processing over $3 billion in annual deal flow. Setup costs $8,000 per SPV with an ongoing 0.15% AUM annual admin fee. The critical detail most new syndicate leads miss is the 5% platform carry: AngelList takes 5% of the profits on top of whatever carry you charge your LPs. If you charge 20% carry and the deal returns $1M in profit, AngelList takes $10K (5% of $200K carry) before you see a dime of your own carry. This adds up significantly across multiple deals.

Closing speed is typically one to two weeks from initiation to first wire. LP onboarding is the smoothest in the industry because many accredited investors already have AngelList accounts with verified accreditation status, which eliminates the biggest friction point in SPV fundraising. New LPs can complete KYC and wire funds in as little as 48 hours once the SPV is live.

Tax administration is handled end-to-end. AngelList prepares and distributes K-1s to all LPs at no additional per-K-1 cost, which is a meaningful savings when you have 50+ investors in a vehicle. K-1s are typically delivered by March 15 each year, well ahead of the April filing deadline. There is no formal minimum SPV size, but the economics only make sense above $100K given the $8K setup cost. Most AngelList SPVs range from $250K to $5M with 10-99 LPs under a Reg D 506(b) exemption.

Sydecar has emerged as the preferred platform for repeat SPV sponsors who want a clean, branded investor experience without the platform carry that AngelList charges. Pricing is a flat $6,000 per SPV with no AUM-based annual fees and, critically, zero platform carry. You keep 100% of whatever carry you negotiate with your LPs. For a syndicate lead running four to six SPVs per year, the savings versus AngelList compound quickly into tens of thousands of dollars.

The investor portal is Sydecar's standout feature. LPs get a modern, white-labeled dashboard that shows their portfolio across all your SPVs, with real-time updates on valuations, distributions, and documents. The onboarding flow supports accreditation verification, electronic subscription agreements, and ACH or wire transfers. Most LPs complete the full subscription process in under 15 minutes. Closing speed is approximately one week from entity formation to accepting wires.

K-1 preparation and delivery is included in the flat fee. Sydecar handles all annual tax filings for each SPV entity and distributes K-1s electronically through the portal. Series SPV support allows you to create multiple tranches under a single master LLC, which reduces per-deal formation costs for high-volume sponsors. The practical minimum SPV size is around $100K, and most Sydecar vehicles run between $200K and $3M with 5-50 LPs.

Assure is the go-to platform when your SPV has complexity that other platforms cannot handle: multiple closing tranches, international LP structures, side letters with different economic terms, or co-investment vehicles alongside a lead fund. Setup fees range from $6,000 to $10,000 depending on complexity, with annual administration fees of $2,000-$5,000 per entity. Assure does not charge platform carry, so all carry economics flow directly to the GP.

Where Assure justifies its premium pricing is in the white-glove service model. You get a dedicated fund administrator who handles entity formation, subscription document preparation, banking setup, capital call processing, and LP communications. This is particularly valuable for first-time SPV sponsors who need hand-holding through the process or for deals with unusual structuring requirements like convertible notes, SAFEs with side letters, or secondary transactions.

Tax administration is comprehensive. Assure prepares all federal and state tax returns for the entity, generates and distributes K-1s, and handles LP tax inquiries directly. K-1s are typically delivered by March 31 each year. Additional K-1 costs may apply at $75-$100 per schedule for SPVs with more than 25 investors. Assure supports international LPs through proper W-8BEN documentation and FATCA compliance, which most other platforms handle poorly or not at all. Minimum SPV size is effectively $250K given the higher fee structure, with most vehicles ranging from $500K to $10M.

Carta Launch is Carta's SPV and fund formation product, leveraging the company's dominant position in cap table management. Setup costs $5,000-$7,000 per SPV depending on complexity, with annual admin fees of $2,500-$4,000. There is no platform carry. The key advantage is integration with Carta's cap table platform: if the portfolio company already uses Carta for equity management, the SPV's ownership automatically syncs with the company's cap table, eliminating manual reconciliation.

LP onboarding runs through Carta's established infrastructure, which many institutional LPs already have accounts on. The subscription process includes accreditation verification, electronic document signing, and wire instructions. Closing speed is typically one to two weeks, comparable to AngelList and Assure. Carta's LP portal provides investors with a consolidated view across all their Carta-administered vehicles, which is a strong selling point for LPs who invest across multiple syndicates.

Tax administration includes K-1 preparation and electronic distribution through the Carta portal, typically by mid-March. Where Carta Launch is uniquely strong is bundling SPV administration with 409A valuations and cap table management for the portfolio company. If you are leading a deal into a Carta-managed company, the integration reduces friction and data entry across the entire investment lifecycle. The minimum SPV size is $100K, with most vehicles between $250K and $5M. Carta Launch supports up to 249 LPs under Reg D 506(c) with general solicitation, or 99 under 506(b).

Rally has carved out a clear niche as the speed leader in SPV formation, with a genuine 48-hour turnaround from initiation to accepting investor wires. Pricing starts at $4,000 per SPV with no AUM-based annual fees and no platform carry. This makes Rally the cheapest mainstream option for one-off deal-by-deal SPVs, particularly for smaller vehicles under $500K where AngelList's $8K setup fee would eat a disproportionate share of the capital.

The 48-hour speed is not just marketing. Rally's process is heavily automated: entity formation, operating agreement generation, subscription document preparation, and banking setup all happen in parallel rather than sequentially. LP onboarding is fully digital with accreditation verification, electronic signatures, and wire or ACH payment. Most LPs can review documents and wire funds within 24 hours of receiving the invitation link, meaning you can realistically close an SPV in under a week from first investor contact to final wire.

K-1 preparation is included in the base fee for SPVs with up to 35 investors. Beyond 35 LPs, there is an additional $50 per K-1 charge. K-1s are delivered electronically, typically by early April. Rally's LP portal is functional but more basic than Sydecar's or AngelList's — it covers the essentials (documents, tax forms, distribution history) without the portfolio analytics or custom branding options. The minimum SPV size is $50K, making Rally the most accessible platform for emerging syndicate leads testing their first deal. Most Rally SPVs range from $100K to $2M with 5-35 LPs.