Inside the Filings of the Largest Music Royalties Fund Ever Raised: Primary Wave's Fund 4 Arc from $600M to $2.2B

AltStreet Research's monitoring systems today flagged a Form D amendment for Primary Wave Music IP Fund 4, LP (CIK 0001993304) filed with the SEC on September 9, 2025 (accession 0001993304-25-000002). The filing reported total securities sold of $1,393,655,900 and a total investor count of 214 — representing increases of 132.2% and 970%, respectively, from figures recorded in the prior amendment dated September 20, 2024. The filing's detection today provides the first formal AltStreet-tracked verification of the mid-raise capital progression for what has since become, by sponsor announcement, the largest dedicated closed-end music royalties fund ever raised.

What the filings show

The September 9, 2025 Form D/A (accession 0001993304-25-000002) for Primary Wave Music IP Fund 4, LP reported total amount sold of $1,393,655,900 and total investors of 214. The preceding amendment, dated September 20, 2024, reported $600,271,000 sold and 20 total investors. No editorial note accompanied either signal, and no reporting-basis change has been flagged by AltStreet's systems. Accordingly, the figures are presented as filed; the magnitude of the investor-count jump — from 20 to 214 in a single amendment cycle — is notable on its face and warrants contextual framing.

The original Form D for CIK 0001993304 was filed September 22, 2023, establishing the issuer as a Delaware limited partnership with a December 31 fiscal year-end. The filing history therefore spans at least three Form D events over a roughly two-year window, consistent with a staged multi-close fundraising structure. A companion entity, Primary Wave Music F4 Offshore Feeder, LP (CIK 0002036153), filed its own Form D in September 2024, confirming the existence of a parallel offshore access vehicle within the Fund 4 complex.

The filings contain no explanation for the investor-count trajectory between amendments. Candidate explanations include: (a) incremental closes admitting additional limited partners throughout the fundraising period; (b) reclassification or disaggregation of investor-count reporting methodology between amendments; or (c) some combination of the two. The filing data cannot distinguish among these possibilities, and AltStreet has not independently verified which is operative.

• —Total amount sold, 2025-09-09 D/A (accession 0001993304-25-000002): $1,393,655,900
• —Total amount sold, prior D/A (2024-09-20): $600,271,000 | Change: +$793,384,900 (+132.2%)
• —Total investors, 2025-09-09 D/A: 214 | Prior D/A (2024-09-20): 20 | Change: +194 (+970%)
• —Original Form D filed: 2023-09-22 | Issuer jurisdiction: Delaware | Fiscal year-end: December 31
• —Companion offshore feeder entity (CIK 0002036153) identified on EDGAR

Background

Primary Wave Music IP Fund 4, LP is a vehicle of Primary Wave IP Investment Management LLC, the registered investment adviser arm of Primary Wave Music — a New York-based independent music publisher founded in January 2006 by Larry Mestel. Since its origin as a music publishing and administration company, the firm has expanded into talent management, film and TV production, digital marketing, and branding. Currently one of the largest indie music publishers in the United States, Primary Wave markets the copyrights of over 15,000 songs from the catalogs of various artists and songwriters.

The Fund 4 vehicle is the fourth in a series of closed-end limited partnerships managed by Primary Wave IP Investment Management. The firm raised approximately $300 million for its first fund in 2016, with investors including BlackRock, followed by a $500 million second fund in 2019. Its third fund, launched in 2021, was reportedly backed with approximately $800 million in capital. The escalation in fund size across vintages is material context for interpreting Fund 4's filing progression.

Primary Wave's institutional profile was significantly amplified in October 2022. Primary Wave received a significant investment from the asset management firm Brookfield, which set up a $1.7 billion fund to purchase copyrights to music while taking a minority ownership stake in Primary Wave. That relationship extended to Fund 4: Primary Wave announced the final closing of Primary Wave Music IP Fund 4 with total commitments of $2.225 billion on April 29, 2026, describing itself as a strategic partner of Brookfield.

The Fund significantly exceeded its original target of $1.5 billion as well as its hard cap of $2 billion, making it the largest dedicated closed-end music royalties fund raised to date in the industry. Backed by a diverse global investor base spanning insurance companies, pension funds, endowments, and large family offices, the Fund's close marks the fourth consecutive oversubscribed Primary Wave Fund. Legal counsel Paul Hastings confirmed a bespoke structural element: Paul Hastings assisted in implementing a bespoke feeder fund for insurance capital and helping to establish a series of subscription line credit facilities for the fund complex.

On the deployment side, Fund 4 has invested $700 million, to a diversified set of over 65 single-artist catalogs including The Notorious B.I.G., Village People, Neil Sedaka, Itzhak Perlman, Ric Ocasek, The Cars, Robert "Kool" Bell, Gilberto Gil, Thin Lizzy, Dave Brubeck, and others. Primary Wave has also been expanding its corporate footprint: in March 2026, the firm announced a definitive agreement to acquire Kobalt, one of the world's largest independent music publishing and technology platforms, from Francisco Partners, with that transaction expected to close in Q3 2026. The Kobalt acquisition was announced at a valuation of $7 billion.

The pattern in AltStreet's data

AltStreet's platform currently holds a watch-severity classification on Primary Wave Music IP Fund 4, LP under the digital_ip_royalties category. No full platform review has been completed and no last-verified date has been established for this entity. The AltStreet dataset contains no recent additional signals for sibling entities in the same filing window, so the BATCH PRESUMPTION of coordinated filing cannot be applied to this detection — however, the existence of a separately registered offshore feeder (CIK 0002036153) means that a parallel Form D/A filing cadence for that entity should be monitored independently.

The September 2025 amendment's investor count of 214 warrants particular attention in the context of the fund's documented multi-close structure. The New Jersey Division of Investment's State Investment Council reviewed a $125M commitment to Fund 4 at its October 29, 2025 meeting — after the September 9, 2025 filing date — suggesting additional closes and further D/A updates may be forthcoming or may already exist outside AltStreet's current verified sequence. The State Investment Council approved $475 million in fresh private equity commitments, with Primary Wave Fund 4 receiving a $125 million commitment. Diligence practitioners should verify the complete Form D amendment history directly on EDGAR to confirm no intermediate filings exist between the two amendments flagged here.

Why it matters

For institutional allocators and their diligence teams, the September 2025 Form D/A provides a contemporaneous regulatory data point situating Fund 4 at roughly 63% of its subsequently announced $2.225B final close at the time of filing. The sharp investor-count increase — from 20 to 214 over a single amendment cycle — is atypical for a fund complex of this profile and warrants specific inquiry. Possible explanations range from sequential closes admitting large cohorts of LPs simultaneously, to disaggregation of entities that were previously reported in aggregate, to the activation of feeder-fund investors as separately countable participants once feeder structures became operational.

The New Jersey Division of Investment recommended the investment based on factors including the asset class's characterization as having low correlation to traditional financial markets and inherent inflation protection, with the global adoption of streaming cited as establishing a scalable and recurring revenue model providing resilient cash flows. These are the sponsor's and adviser's own characterizations as reported in official state documents, not independent findings.

The firm generally charges its funds a management fee, payable quarterly in advance, ranging from 1.5% to 2% per annum of the capital commitment during the investment period of each limited partner. Fee and carry terms for Fund 4 specifically should be confirmed against Fund 4's offering documents, which are not publicly available.

The Kobalt acquisition — announced in March 2026 and pending as of the April 29, 2026 final-close announcement — introduces integration and operational scale considerations that postdate the September 2025 filing. Allocators conducting current diligence on Fund 4 should incorporate this development into their analysis of the sponsor's operational bandwidth and strategic trajectory.

What the filings do not show

The Form D/A (accession 0001993304-25-000002, filed 2025-09-09) does not disclose the identities of any investors, the terms of individual limited partnership agreements, the fund's valuation methodology for music IP assets, performance data of any kind, or the allocation of capital across asset acquisitions.

The filings do not explain the investor-count jump from 20 to 214. Form D investor-count fields reflect what the issuer reports at a given amendment date; they do not specify whether the increase reflects new closes, reclassification of feeder-fund participants, disaggregation of previously pooled entities, or any combination thereof. AltStreet has not verified which explanation is operative.

The September 2025 filing amount of $1,393,655,900 does not represent the final fundraise total. Primary Wave's April 29, 2026 announcement of $2.225B in total commitments (Primary Wave pressroom) is a platform-reported figure, not derived from or reconciled to Form D data in this analysis. Form D amounts and LP commitment figures may diverge due to timing, currency, feeder aggregation, and other factors.

The existence of the Primary Wave Music F4 Offshore Feeder, LP (CIK 0002036153) means that the Form D/A reviewed here covers only one legal entity in the Fund 4 complex. The complete capital and investor picture may require reviewing filings for the offshore feeder and any co-investment vehicles independently.

AltStreet Research has no verified full review of this entity on its platform as of today's detection date. No last-verified date exists. The findings here are based on the detected filing signals and publicly available sources cited; they do not constitute a completed due-diligence assessment of the fund, its sponsor, or its underlying strategy.