SpaceX Lockup Tests the Float, Buybacks Return, and the SEC Wants to Rewire the Plumbing

The IPO market’s August calendar is thin, but the supply story is not. A SpaceX lockup expiry that could triple the public float, a reacceleration of corporate buybacks as earnings blackouts lift, and an SEC proposal to rescind the Order Protection Rule are all converging in the same two-week window. None of these is a crisis indicator on its own. Together they amount to the most concentrated supply-and-structure event of the summer.

The SpaceX Lockup: A Float That Could Triple

SpaceX (SPCX) completed its IPO on June 12, 2026 at $135 per share. The first lockup expiry on Thursday, August 7, frees up to 912 million of the company’s roughly 13.6 billion outstanding shares — enough to more than double the current public float, and potentially triple it if a price-based early-release provision is triggered^[1].

The stock has already fallen 49% from its June high^[1], and the selloff accelerated after Q2 earnings despite a 92% year-over-year revenue jump and management’s reiteration of a $100 billion annualized revenue trajectory^[1]. Brokers are bracing for heavy selling. R.F. Lafferty CEO Robert Hackel called it “the most talked-about lockup in the history of IPO lockups”^[1].

What makes this lockup unusual is its staggered structure. Rather than releasing all restricted shares on a single day, the underwriting banks designed a schedule that frees additional shares over nearly a year. By mid-2027, an additional 12.9 billion shares will have become eligible for trading^[1]. CEO Elon Musk’s roughly 42% stake remains locked until one year post-IPO^[1].

The key question is not whether selling occurs — it will — but who sells and how much. Early backers including Founders Fund, Craft Ventures, Antonio Gracias’s Valor Equity Fund, and Alphabet have not publicly indicated their intentions^[1]. Some advisors report that employees they have contacted are “long-term believers” who plan to hold^[1]. But the options market is already pricing extreme volatility: one advisor described put protection costs as “sheer insanity”^[1].

SpaceX is not the only lockup event this month. The Fundrise Innovation Fund (NYSE: VCX) announced on July 24 that it would accelerate its post-listing lockup expiration from September 14 to August 13, making previously locked shares tradable on August 14^[2]. Management stated the lockup had “achieved its primary purpose of supporting orderly price discovery”^[2] — a signal that at least one issuer is confident the market can absorb the supply.

The IPO Pipeline: Thin but Inflected Toward AI

The new-issuance calendar for the week of August 11 is modest in dollar terms but notable for its thematic concentration:

Source: IFR US ECM Calendar^[3], Yahoo Finance IPO Calendar^[4]

Londian Wason’s $78.6M offering has attracted cornerstone indications from Harvest Global Capital ($50M) and Hithium Global ($30M)^[3] — energy-storage investors backing a copper-foil supplier, which signals the battery-supply-chain theme is still finding public-market entry points.

More consequential for the forward pipeline is Switch Inc., the Las Vegas-based data center operator, which confidentially filed for a U.S. IPO on or around August 7^[5]. Switch’s re-listing (the company was taken private by DigitalBridge in 2022) would join the AI-infrastructure theme that has driven much of 2026’s issuance appetite. No terms have been disclosed, but the filing itself signals that underwriters see enough demand to begin the process for a large-cap infrastructure name.

Secondaries and Buybacks: Two Sides of the Same Coin

While the IPO market is thin, the secondary offering pipeline is active. Primo Brands Corporation (NYSE: PRMB) announced on August 6 a 20 million-share secondary offering by an affiliate of One Rock Capital Partners, with Morgan Stanley as sole underwriter^[6]. Primo Brands itself will concurrently repurchase $10 million of shares in a private transaction at the public offering price less underwriting discounts^[6] — a structure that partially offsets the supply overhang and signals the company’s view that its own stock is attractively priced.

AB InBev also closed books on a secondary offering in early August^[7].

On the demand side, corporate buybacks are set to reaccelerate sharply. According to Citadel Securities’ Global Market Intelligence desk, only about 45% of the S&P 500 by weight is currently eligible to repurchase shares, as most companies remain in earnings blackout windows^[8]. That figure is expected to rise to 75% by the end of this week and nearly 85% by mid-August as blackouts expire^[8]. August is typically one of the busiest months of the year for corporate buyback execution^[8].

Internationally, the buyback pace is also picking up: ISS commenced the second tranche of its program with a DKK 600 million increase on August 11^[7], Universal Music Group started a EUR 250 million repurchase program on August 6^[7], and Itochu announced a JPY 3 trillion buyback program including a tender offer^[7].

The simultaneous supply from secondaries and demand from buybacks creates a tug-of-war that will shape August’s volume and volatility profile. The net direction depends on whether buyback demand can absorb the secondary supply — and whether SpaceX lockup selling spills into broader market sentiment through the ETF and index channels that now dominate volume.

The Plumbing Beneath: Three Structural Shifts

Beneath the headline index levels, three structural developments are worth monitoring — not because any one of them is a trigger, but because their convergence compresses the timeframe in which a surprise would have to be absorbed.

1. Liquidity is thinner than the index suggests. The Fed’s overnight reverse repo facility has been draining since its December 2022 peak of $2.7 trillion, and as it approaches the zero-usage floor, quantitative tightening begins hitting bank reserves directly rather than being absorbed by the RRP buffer^[9]. Meanwhile, Liquidnet’s Q2 2026 U.S. Liquidity Landscape report shows that average depth of book fell 32% compared to January 2025^[10]. OTC volume has declined to 34% of the market from 38% in 2025, while ATS volumes have risen to 14%^[10]. ETF volumes reached a record 29% of total market volume in March^[10], and after-hours trading rose nearly 70% between 2024 and 2025^[10]. The plumbing has less capacity to absorb a shock than it did two years ago, even as more trading migrates to venues that did not exist a decade ago.

2. Options positioning is loaded with put protection. The SPY put-to-call open interest ratio sits at 2.25 — more than two puts for every call outstanding^[9]. In a negative gamma regime, dealers must sell into declines and buy into rallies, amplifying moves rather than cushioning them. Whether the gamma regime flips depends on where SPY trades relative to dealer hedging levels, but the put-heavy structure means the downside amplifier is pre-loaded. Citadel Securities noted that single-name volatility remained elevated while index-level volatility stayed historically low through July, creating an unusually wide gap that only began to narrow during the broad-based selloff^[8].

3. The SEC is proposing to rescind the Order Protection Rule. On June 11, 2026, the SEC proposed amendments to rescind Rule 611 (the “trade-through rule”) and Rule 610(e) (the prohibition on locked and crossed markets)^[11]. If adopted, this would represent one of the most significant equity market-structure changes in two decades^[11]. The November 2026 deadline for implementation of tick-size and access-fee rule changes is also in question^[10]. Commissioner Peirce’s statement noted that technological advances may have rendered the rules “unnecessary”^[11], but rescission would alter how liquidity forms across competing venues — with direct implications for institutional best execution, spread compression, and the fragmentation that Traders Magazine reported is already pushing institutions to rethink execution strategies^[12].

The Concentration Problem

The top 10 companies in the S&P 500 account for 40.7% of the index’s total weight, up from roughly 19% at the end of 2015^[9]. Technology and financials comprise 62% of the top 20 names^[9]. Citadel Securities noted that S&P 500 semiconductor companies have collectively lost roughly $1.5 trillion in market capitalization, reducing the semiconductor weight from nearly 20% to 16%^[8] — a de-concentration event that, paradoxically, may make the index more resilient to single-sector shocks even as it masks idiosyncratic volatility beneath the surface.

The concentration matters for supply-demand dynamics because index-level inflows and outflows are disproportionately channeled through a small number of names. When institutional block orders show net selling while retail flows are net buying^[9], the question is which side is right — and historically, late-cycle institutional selling has been the more reliable signal, though the sample size is small and the structural backdrop this cycle is unlike prior ones.

A Counter-Argument: The Reset Is Mostly Done

Not everyone sees the plumbing as fragile. Citadel Securities’ Scott Rubner argues that the July technical reset has largely run its course: retail investors reduced risk, leveraged ETF assets declined more than $60 billion from June peaks, semiconductor leveraged ETF assets fell 55%, and equity financing spreads compressed from 138 bps above SOFR to approximately 50 bps^[8]. Consensus S&P 500 Q2 earnings growth has been revised from 22.4% to approximately 45%^[8] — one of the steepest earnings revision paths on record.

The S&P 500 Information Technology sector now trades at roughly 20x forward earnings, near one-year valuation lows (1st percentile) and below its 10-year average of 23x^[8]. In Citadel’s framing, July “did not change the structural bull market — it reset it”^[8].

Both readings can be simultaneously true: the technical excesses have been unwound, and the structural liquidity beneath the market is thinner than it was. The reset improves the fundamentals-to-positioning ratio. It does not add capacity to the plumbing.

What to Watch Next

• SpaceX lockup selling volume and price impact (Aug 7 onward): Whether the first wave of unlocked shares triggers cascade selling or is absorbed by buy-side demand. The staggered schedule means this is a recurring event through mid-2027, not a one-day affair.
• S&P 500 buyback eligibility reacceleration (mid-August): Citadel’s estimate of 85% buyback eligibility by mid-August creates a demand floor for index components — but not for the newly unlocked supply in names like SpaceX that sit outside the index.
• Switch IPO terms (timing TBD): The first major data-center re-IPO of the AI cycle will be a demand test for infrastructure-themed public issuance.
• SEC Reg NMS comment period and next steps: The proposed rescission of Rule 611 is still in proposal stage. The comment period, adoption timeline, and any phased implementation will determine how quickly liquidity-formation mechanics change.
• Fed RRP usage: If usage approaches the zero floor, QT begins hitting bank reserves directly — a structural tightening that no earnings beat can offset.
• SPY put-to-call open interest ratio and gamma flip level: Whether dealer gamma exposure remains positive (volatility-suppressing) or flips negative (volatility-amplifying) will determine whether any supply shock is absorbed or amplified.