AltStreet Weekly Markets: Stonepeak's Infrastructure Fund Tops $819M

AltStreet's dossier for the week ended September 4, 2026 centers on a wealth-channel infrastructure raise, a further compression in on-chain credit compensation, and a narrowing tokenized-equity premium, against a broadly flat AI-compute and carbon-token tape. Window statistics referenced throughout this wrap describe each series' own AltStreet-collected observation history, not the life of the underlying market; most windows begin in mid-July 2026 unless noted otherwise.

Filings across AltStreet's tracked Form D universe produced the week's largest capital-formation move, with two Stonepeak infrastructure vehicles together reporting $819.1 million sold. Tokenized markets pulled in different directions: cross-venue quote gaps and absolute premiums on AltStreet's curated tokenized-equity marks both narrowed, while the large-pool stablecoin yield median reached a window high. On-chain private credit TVL climbed to a window high concentrated almost entirely in one protocol, on-chain credit spread compensation compressed to a window low, and GPU rental medians for H100 and A100 chips sat exactly where they have all summer.

This week on AltStreet

AltStreet's news and explainer coverage this week ties directly into the dossier below:

• —Stonepeak's Wealth-Channel Infrastructure Fund Reports $819.1 Million Sold Across Its Two Vehicles as Investor Count Rises 70%, the Form D amendment behind this week's featured filings-flow delta
• —What Is Form C-U? Kuleana Spirits' Reg CF Filing Reports a $1.9 Million Close, explains the filing type behind two of this week's Reg CF progress-update counts
• —What Is a Form D Amendment? KKR Infrastructure V's D/A Tops $17 Billion, background on the filing mechanism behind this week's featured delta
• —Kalshi Reports $1.12 Billion Sold in New Form D, Its Largest Disclosed Raise, context on one of the two venues behind this week's prediction-market activity read

Three things that mattered

First, AltStreet's EDGAR Filings Flow module recorded the week's largest capital-formation delta at Stonepeak-Plus Infrastructure Fund LP and its tax-exempt feeder, which together reported $819.1 million sold across Form D amendments filed September 1, up from $702.1 million, with investor counts rising 67.7% and 76.3% on the two vehicles. Full detail, including a smaller Makena Perpetual amendment, runs in the feature below.

Second, the AltStreet On-Chain Credit Spread compressed to 58 basis points, a window low across 21 observations since August 15, 2026, down from 68 basis points a week earlier. The credit leg remains concentrated: Maple Finance carries 100% of the qualifying pool weight, so the reading tracks one protocol's advertised yield, not a diversified on-chain credit market.

Third, the AltStreet Tokenized Equity Basis narrowed to a median absolute premium of 16.51 basis points across nine symbols on September 3, down from 35.74 basis points two weeks earlier across 34 observations since August 1, 2026. The narrowing describes tokens tracking their underlying securities more closely, not a trading opportunity captured by anyone.

Stonepeak's $819 Million Feeder Pair Leads a Busy Week of Form D Amendments

AltStreet's EDGAR Filings Flow module, a derived read of Form D amendment deltas and filing counts across AltStreet's tracked-entity universe, counted six Form D amendment deltas this week among filings dated August 29 through September 4. The same window carried 15 exchange-act filings, five amendment-spike flags, eight new EDGAR entity detections, three offering-circular supplements and three new Form 1-U filings; none of these signals imply a cause for any single amendment.

The largest deltas came from Stonepeak-Plus Infrastructure Fund LP, which filed a Form D amendment September 1 raising its cumulative amount sold to $819,129,819 from $702,056,799, a 16.7% increase, with its investor count rising to 213 from 127, up 67.7%. Its tax-exempt feeder, Stonepeak-Plus Infrastructure Fund (TE) LP, filed an identical amendment the same day, also reporting cumulative sold at $819,129,819 from the same $702,056,799 base, with its investor count rising to 104 from 59, up 76.3%. The two entities report the fund's shared cumulative total from each vehicle's own Form D/A, a structure common to parallel taxable and tax-exempt feeders.

A smaller amendment came from Makena Perpetual U.S. Real Estate Fund, L.P., which raised its cumulative amount sold to $498,251,616 from $497,951,616, a 0.06% increase, and its investor count to 20 from 19, filed August 31. Both filings are issuer-reported cumulative totals, a capital-formation read rather than a market price or a return.

For background on how these cumulative-total amendments work, see What Is a Form D Amendment? KKR Infrastructure V's D/A Tops $17 Billion; AltStreet draws no causal link between filing timing and any external event.

Elsewhere in the tape

AltStreet's Reg CF Flow enumeration counted 12 new Form C offerings for the week ending September 4, with 13 distinct issuers across those offerings since Form C filings may name co-issuers, plus two Form C-U progress updates such as Kuleana Spirits' filing. Aggregate disclosed target capital was $15,156,000 (median $500,000), and the newest days carry a one-day median detection lag, so this week's count of 12 may still revise upward.

AltStreet's GPU Rental Index held H100 and A100 80GB on-demand medians unchanged at $4.19 and $3.2315 per GPU-hour, flat across the entire 55-observation window dating to July 12, 2026, so each sits simultaneously at its own window's high and low. The RTX 4090 spot median rose to $0.3222 per GPU-hour from $0.2007 a week earlier, in the 85th percentile of its range.

AI-compute tokens softened: Render eased to $1.43, Akash to $0.51 and Bittensor to $224.64, each down 2-4% on CoinGecko's 24-hour measure. Carbon-linked tokens were quieter: Nature Carbon Tonne printed at $0.22509, while Klima Protocol's thin-liquidity K2 and kVCM tokens fell to $0.0045 and $0.0061, both scoped as weak, micro-cap signals.

AltStreet's Tokenized RWA TVL, an Ondo Finance and Centrifuge aggregate, held at $5.09 billion, in the lower part of its range. On-chain private credit TVL rose to $3.11 billion, a window high, though Maple Finance alone accounted for roughly 99.9% of that total. Tokenized Equity Market Cap, a Backed Finance xStocks aggregate on Solana, rose to $831.3 million, a window high across 331 observations since September 5, 2025, with the top five symbols holding 55.7%. Venue Liquidity, a separate roughly-103-symbol universe, showed $78.6 million in live-collected 24-hour volume. Venue Spread narrowed to 20.82 basis points from 34.28; none of these figures describe capturable arbitrage. Tokenized Treasury AUM edged up to $5.81 billion.

AltStreet's Large-Pool Stablecoin Yield Median rose to 4.36% across 104 pools, a window high. AltStreet Prediction Market Activity, Polymarket's 24-hour volume above its $100 floor, was roughly flat at $55.2 million (86th percentile); Kalshi carried 8,000 open events, tracked separately and never summed with Polymarket's dollar figure. Kalshi's own $1.12 billion Form D raise was reported separately this week.

Official EIA data showed WTI Cushing spot at $91.48 per barrel, up from $83.90; Henry Hub spot at $2.90 per mmBtu, up from $2.70; and Lower-48 working gas storage at 3,214 Bcf, up from 3,184. Puro.earth's registry, cited with attribution, showed cumulative retirements at 1,049,050 tonnes against 1,824,857 issued. AltStreet's Concreit NAV Index held at 105.49. Liv-ex Ltd's Fine Wine 100 and Fine Wine 1000 indices, cited monthly, closed August at 322.9 and 352.3, both up roughly 1%, per Liv-ex. Elsewhere, Hiive's Hiive50 index, a license-restricted benchmark AltStreet quotes only as an attributed citation, printed at 171.85, down from 174.25 but up roughly 53% over the trailing twelve months, per Hiive.

Frequently asked

How does detection lag affect AltStreet's newest Reg CF weekly count? AltStreet's Reg CF Flow enumeration for the week ending September 4 counted 12 new Form C offerings, but the module's own median detection lag for the window is one day, meaning filings late in the window are still being detected; AltStreet treats the most recent days as provisional and describes the count as its own EDGAR enumeration, not an official SEC figure.

How large is AltStreet's tracked tokenized-RWA universe? AltStreet's Tokenized RWA TVL aggregate, summing DefiLlama TVL for Ondo Finance and Centrifuge, stood at $5.09 billion this week, in the lower part of its own observation range; it is a two-protocol coverage universe, not a measurement of all tokenized real-world-asset activity.

Disclosures

All figures in this wrap are descriptive market data drawn from AltStreet's own tracked-entity and coverage universes, DefiLlama, CoinGecko and official U.S. EIA series, as scoped in each module above; none constitute investment advice or a recommendation. Window statistics reference each series' own AltStreet-collected observation history, most beginning in mid-July 2026, and percentile figures are a rank within that window, not a valuation. Liv-ex Ltd, Hiive and Puro.earth data are quoted here as third-party citations with attribution, per their respective license terms.