The August Supply Wall: Lockups, Liquidity, and What the Plumbing Says

The IPO calendar and the market’s plumbing are converging on the same two weeks. August will bring the largest lockup expiry in U.S. market history — SpaceX’s staggered release of more than 1.37 billion shares starting August 6 — at the same moment that Treasury bill settlements are draining an estimated $120 billion from the financial system over the final days of July, with the drain set to continue through September. New issuance is arriving into that same window: Jersey Mike’s is mid-roadshow on a deal targeting up to $1.09 billion, a CRISPR biotech just closed its IPO, and China’s CXMT debuted with a 466% first-day surge. The collision of rising share supply, falling reserves, and a dispersion trade that is beginning to roll over is the kind of pattern that does not announce itself in the headline index — it shows up in the plumbing first.

The supply wall: SpaceX lockup expirations

SpaceX (SPCX) raised more capital in its IPO than any public company in history, and the lockup structure that contained that supply is now scheduled to begin releasing shares in tranches starting August 6 — two days after the company’s first-ever earnings report on August 4.^[1]

The timeline, per the company’s S-1 filing:

The conditional tranche is the detail worth watching. It only unlocks if SpaceX trades at least 30% above its $135 IPO price — roughly $175 — for five of ten consecutive trading days ending on the earnings release date. As of July 21, SPCX was trading near $129, already below its IPO price and down more than 36% from its post-debut high.^[2] The conditional tranche therefore looks unlikely to trigger at current levels, but the first 20% wave is unconditional — it arrives regardless of price.

Only about 555 million shares — roughly 5% of the 13 billion total — are currently in the public float.^[1] The August 6 release alone would roughly triple the tradable float. Elon Musk’s personal 6.4 billion shares remain locked until June 2027 with no early-release provisions, which removes the largest single overhang but still leaves a supply increase that the market has never absorbed in this name.

The base rate here is not reassuring. Academic and practitioner research on lockup expirations consistently finds abnormal negative returns around the event, with the effect concentrated in the days immediately before and after the unlock. The mechanism is simple: a sudden increase in the supply of tradable shares meets a finite pool of marginal buyers. For most IPOs, the float increase is modest. For SpaceX, the absolute size of the release is without modern precedent.

The liquidity drain: Treasury settlements and the dispersion trade

While the supply side builds, the demand side is being mechanically squeezed. The week of July 28 brings approximately $120 billion in Treasury settlements — $70.5 billion on July 28, $38.5 billion on July 30, and $11.6 billion on July 31 — with the majority consisting of T-bills.^[3] Treasury bill issuance will continue at a heavy pace through Labor Day, and the pattern is not benign for equities: since tracking began, only 45.7% of T-bill settlement days have been positive for the S&P 500, with an average return of roughly negative 23 basis points on those days.^[3]

This is a reserves drain, not a narrative event. When the Treasury issues bills, primary dealers and fund managers pay for them by drawing down balances at the Fed — reserves leave the banking system and enter the Treasury General Account. That reduces the cash available for risk-asset deployment, and the effect is cumulative: the drain does not reverse until the Treasury spends the cash back into the system or the Fed rolls maturing assets.

Layered on top is the unwind of the dispersion trade. Single-stock implied volatility spiked through the first half of earnings season — Alphabet and Tesla reported, and the VIXEQ (a measure of individual-equity implied volatility) fell sharply afterward but remained elevated for names still to report.^[3] The spread between dispersion and implied correlation has been exceptionally wide, a condition that has historically correlated with the S&P 500. As that spread narrows — which it should as Microsoft and Meta report on July 29 and Apple and Amazon on July 30 — the mechanical pressure is toward higher index correlation and lower dispersion, a regime that has typically coincided with weaker index performance.^[3]

Equity funds have already seen two consecutive weeks of outflows,^[4] and the Nasdaq fell 2.90% last week while the S&P 500 dropped 1.55%, driven by cooling AI sentiment and semiconductor weakness.^[4] The SMH semiconductor index fell approximately 9% over the same period.^[4]

New issuance: what is coming to market

Scribe Therapeutics (SCTX) — CRISPR biotech

Scribe Therapeutics priced its upsized IPO on July 23 at $15.00 per share — the high end of its range — raising $128.7 million in gross proceeds from 8.58 million shares.^[5] The offering closed on July 27 with full exercise of the underwriters’ option to purchase an additional 1.287 million shares.^[5] The company also entered a concurrent private placement with Sanofi for 500,000 shares at $15.00.^[5]

Scribe, co-founded by Nobel laureate Jennifer Doudna, is developing in vivo CRISPR genetic medicines for cardiometabolic disease, with its lead candidate STX-1150 targeting PCSK9 silencing to reduce LDL-C.^[5] The company has strategic collaborations with both Sanofi and Eli Lilly.^[5] The deal was led by Leerink Partners, Goldman Sachs, Guggenheim Securities, and Wells Fargo.^[5]

The pricing at the high end is a signal in itself — biotech IPOs have been scarce, and demand was sufficient to upsize the deal. Endpoints News framed it as the start of a “second-half IPO spree” for biotech.^[6]

Jersey Mike’s Subs (JMKE) — consumer

Jersey Mike’s launched its roadshow on July 20, targeting up to $1.09 billion through 43.5 million shares priced at $21 to $25.^[7] The deal is 68% secondary — existing shareholders, including Blackstone, are selling — with the remainder as primary proceeds.^[7] The company operates over 3,000 franchised sandwich locations in the U.S. and will list on the NYSE under JMKE.^[7] At the midpoint, the deal would value the chain at roughly eight times Sweetgreen’s market capitalization, according to Fortune.^[7]

A large secondary component in a consumer IPO during a liquidity-drain window is worth flagging: the selling stockholders are extracting cash at the same moment that Treasury settlements are pulling reserves from the system. That is not inherently negative — it is what the IPO market is for — but it is additive to the supply picture.

CXMT — China’s record-setting debut

China’s largest DRAM maker, ChangXin Memory Technologies (CXMT), debuted on the Shanghai STAR Market on July 27 and surged 466%, making it the most valuable listed company on China’s mainland at roughly 3.28 trillion yuan (~$485 billion).^[8] The Hefei-based company raised 57.92 billion yuan ($8.6 billion) in its IPO, pricing shares at 8.66 yuan; they opened at 49.50 and touched 55.03.^[8] CXMT held a 7.67% share of the global DRAM market in 2025 and plans to use proceeds mainly for mass-producing memory wafers.^[8]

The debut occurred amid a global memory shortage and coincided with China’s push for semiconductor self-sufficiency.^[8] While this is a domestic Chinese listing, the scale — an $8.6 billion raise producing a $485 billion market cap on day one — is a data point on global risk appetite for chip-related supply. It also raises a familiar question about first-day IPO valuations and what happens when lockup periods expire in that market as well.

The IPO market in aggregate

Renaissance Capital’s year-to-date data shows 87 IPOs priced in the U.S. in 2026, down 26.9% from the prior year — but total proceeds raised reached $142.5 billion, a 679.4% increase driven by the SpaceX mega-offering.^[9] Filing activity is up 10.8% year-over-year, with 154 IPOs filed, suggesting the pipeline is rebuilding.^[9] The industry breakdown shows 132 SPAC IPOs as the most prolific sector, though these are small and largely irrelevant to the supply-and-liquidity dynamics discussed here.^[9]

The divergence between deal count (down sharply) and proceeds (up dramatically) tells the story: the 2026 IPO market is defined by a handful of outsized offerings rather than broad-based issuance. That means the lockup and supply dynamics are concentrated in a few names — SpaceX being the dominant one — rather than distributed across many small deals.

Shein: the outlier listing to watch

Shein filed its draft prospectus for a Hong Kong IPO on July 26, disclosing annual revenue of $41.8 billion for 2025 (up roughly 8%) and a net profit that fell 38.7% to $2.064 billion.^[10] The fast-fashion retailer also swung to a $99 million quarterly loss, attributed to the U.S. removal of the de minimis import duty exemption on small packages and a one-time accounting charge.^[10] China’s securities regulator cleared the listing on July 10.^[10]

Shein’s deteriorating margins ahead of its listing are a reminder that the most anticipated IPOs do not always arrive from positions of strength. The Hong Kong listing will not directly affect U.S. market supply, but it is a barometer of global investor appetite for consumer-facing growth at a time when margins are compressing.

What to watch next

1. SpaceX earnings (August 4) and lockup release (August 6): The first earnings report sets the narrative; the unconditional 20% tranche release two days later is the mechanical event. Watch whether SPCX can hold above $135 — the conditional 10% tranche requires a 30% premium for five of ten days, and at current prices that trigger looks distant.

2. Treasury settlement schedule (July 28–31 and beyond): $120 billion drains this week alone. Monitor reserve balances at the Fed and the repo market for stress signals. Heavy issuance continues through Labor Day.

3. Mega-cap earnings (July 29–30): Microsoft and Meta report July 29; Apple and Amazon report July 30. These reports will determine whether the dispersion trade continues to unwind or re-inflates. The narrowing of the dispersion-correlation spread is the mechanical watch item.

4. Jersey Mike’s pricing and first-day performance: The deal is mid-roadshow. Watch whether the 68% secondary component prices within range and how the aftermarket trades — a large consumer IPO’s reception is a read on broad risk appetite.

5. Federal Reserve decision (July 30): The policy decision and press conference arrive mid-week, directly into the liquidity-drain window. The 1-day VIX is likely to rise materially ahead of the announcement.^[3]

6. Equity fund flows: Two consecutive weeks of outflows are already on the board. A third week would mark a trend, and it would arrive during the heaviest settlement period.

The pattern here is one of escalating supply meeting declining reserves, with a derivatives regime shift layered on top. None of these factors in isolation would necessarily move the index — but the clustering is what makes this a watch item rather than a wait-and-see. The signals are in the plumbing, not the headlines.