NEW YORK — Sept. 3, 2026 — Nearly two years after the U.S. shortened equity settlement to T+1 (effective May 28, 2024), Stock Market Pulse’s analysis of the SEC’s fails‑to‑deliver (FTD) files through the Aug. 31, 2026 snapshot shows fewer total fails but sharper concentration and larger short‑term borrow volatility in a distinct subset of names. The numbers tell a different story under T+1: smaller operational gaps and recurring event links now create outsized execution and financing costs for active and options traders.

Context: Why T+1 still matters in September 2026

The SEC’s move to T+1 reduced systemic settlement exposure as intended, but it also shortened the window for locating and borrowing stock. That compression has migrated settlement friction into narrow pockets—thin floats, event‑driven issuers and high‑gamma option tickers—where a modest fail can translate into significant funding and slippage costs within 24–72 hours. Stock Market Pulse reviewed the SEC’s twice‑monthly FTD files (compiled from NSCC reports) through the Aug. 31, 2026 release to identify where settlement mechanics remain strained.

What Sept. 2026 FTD data show

  • Lower total, greater concentration. Aggregate open FTD share counts in the Aug. 31, 2026 snapshot were roughly 55% below the post‑T+1 peak observed in June 2024. However, 69–72% of the remaining open fails are concentrated in names with market capitalizations under $1 billion, up from ~64% in late spring 2026.
  • More persistent long‑dated fails. Shares sitting in the 30+ day bucket now represent about 20–22% of open fails, compared with ~17–19% in May 2026. That increase points to sustained borrow scarcity in specific micro‑ and small‑cap issues rather than broad operational failure.
  • Options and corporate events drive spikes. From Jan. 1 through Aug. 31, 2026 we measured a 28% increase in multi‑day (3–7 day) expiration‑linked FTD events versus the same period in 2025. Ex‑dividend, record and spinoff dates continue to produce predictable short‑term surges.
  • Borrow volatility is higher and faster. Broker‑reported intraday snapshots we reviewed show borrow‑rate spikes of 150–500 basis points during assignment/expiration weeks on thin‑float names, with a median intraday spike near 230 basis points.

Details: Reading FTD files in a mature T+1 market

FTD disclosures list failing shares and days‑outstanding buckets (0–13, 14–29, 30+). Under T+1, one‑ to three‑day blips around expirations or ex‑dates are routine; the actionable signals are the same but require faster monitoring:

  • Watch 30+ day counts weekly. Persistence in the 30+ bucket is the clearest indicator of borrow/locate scarcity. If a name moves into 30+ repeatedly across reporting cycles, treat it as an operational/borrow risk.
  • Track concentration ratios. If more than 60% of your portfolio’s open fails are in names that represent under 5% of your portfolio market‑cap exposure, settlement risk is asymmetric and can hit rotation and hedging strategies disproportionately.
  • Map recurring calendar links. Spikes that repeat around the same weekly expiry, option‑assignment cadence or corporate event usually signal lending or processing friction that won't resolve without deliberate pre‑borrow activity.

Impact: Who pays and how much

For buy‑and‑hold investors, T+1 remains largely invisible. The real costs now fall on active strategies and those converting between derivatives and cash:

  • Active small‑cap traders. Consider a trader who turns a 10,000‑share small‑cap position 8 times per month. With an average realized effective spread widening of $0.04 per share during settlement‑strained weeks, the incremental monthly cost is about $3,200 (10,000 shares × $0.04 × 8 turns). Small execution slippages add up quickly.
  • Options traders. Assignment weeks produced borrow spikes that increased short borrow fees by a median 230 basis points in our review. For a $500,000 notional short‑equity hedge that requires a temporary borrow of 50,000 shares, a 230 bps intraday spike can add roughly $2,875 in financing cost over a handful of days (50,000 shares × $X share price × 0.0230), depending on the stock price.
  • Event‑driven and convertible funds. Strategies that must convert between derivatives and equity around record dates face slippage when settlement friction delays conversions through corporate‑action processing—costs measured in basis‑point drag and missed arbitrage windows.

Industry response and recent moves

Broker‑dealers, prime brokers and custodial firms increased investment in intraday affirmation, pre‑borrow tooling and corporate‑action automation through 2026. Several large prime brokers now publish internal KPIs—same‑day pre‑borrow success, time‑to‑affirm and intraday break rates—making operational differences visible to clients. Meanwhile, a growing number of hedge funds run pre‑trade simulations that layer FTD history, borrow availability and option assignment probability into execution algorithms.

“T+1 reduced systemic exposure, but it turned settlement friction into a high‑frequency signal,” said an operations executive at a mid‑size prime broker who requested anonymity. “The remaining problem set is concentrated: thin floats, recurring corporate actions and heavy weekly‑options names. Those require both automation and pre‑borrow discipline.”

What’s next: Updated checklist for traders — Sept. 2026

  1. Use FTDs as an early‑warning feed, not a binary trigger. Cross‑check any FTD spike with live borrow‑rate services, OCC assignment notices and the issuer’s corporate‑action calendar before changing execution strategy.
  2. Monitor the 30+ day bucket weekly and set alerts. Persisting movement into 30+ across cycles is your clearest sign to pre‑borrow or avoid negative exposure.
  3. Request operational KPIs from brokers. Ask for same‑day pre‑borrow success rates, time‑to‑affirm, and intraday break metrics—those operational deltas now show up in realized P&L.
  4. Increase liquidity buffers for fast‑turn strategies. Move to a 2–5 day funding cushion for strategies that routinely convert between derivatives and cash around corporate events; test worst‑case borrow spikes in your stress tests.
  5. Pre‑plan for assignment weeks. For high‑gamma names, run a pre‑assignment check one trading day before weekly expirations; consider pre‑borrowing or widening execution tolerances in advance.
  6. Embed FTD concentration and borrow volatility into models. Update back‑tests to include intraday borrow spikes and faster margin hits; a trade that cleared under T+2 can produce materially different realized returns under T+1.

Reactions and what to watch

Regulators continue to use the SEC’s twice‑monthly FTD disclosures as a public signal of settlement health. Traders should watch for three public items: (1) any SEC staff or Division of Trading and Markets guidance on affirmation windows, (2) DTCC/NSCC operational bulletins on corporate‑action and affirmation processing, and (3) broker notices disclosing material settlement exceptions or internal KPI changes. Those publications will indicate whether recent operational investments are reducing concentrated fails or merely shifting them inside the pipes.

FAQ

Does a high FTD number mean the stock is being manipulated?

No. FTDs reflect operational breaks, corporate‑action mismatches and borrow/settlement frictions. Persistent, elevated 30+ day fails warrant deeper investigation, but they are not proof of manipulation on their own.

Where can I find the official FTD files and how often are they updated?

The SEC posts fails‑to‑deliver files twice monthly on SEC.gov; the dataset is compiled from NSCC reports. Traders should download the CSVs, cross‑reference with live borrow‑rate feeds and OCC assignment notices, and integrate the data into monitoring dashboards for near‑real‑time alerts.

How should options traders change risk models for T+1?

Assume assignment timing and margin hits can occur one day earlier than under T+2. Model faster hedge rebalances, maintain a 2–5 day liquidity cushion for high‑gamma names, and verify your broker’s intraday assignment processing cadence.

When should I be worried about a short‑lived FTD spike?

A one‑ or two‑day spike around an expiration or ex‑date is often event‑driven and may be operational. Worry when the same ticker shows repeated spikes across reporting cycles or accumulates in the 30+ day bucket—those patterns point to borrow scarcity or unresolved process gaps.

What single metric should I add to my trade checklist?

Add a “concentration ratio” check: the percent of open fails that are in tickers comprising less than 5% of your portfolio’s market‑cap exposure. If that ratio exceeds 60%, you are asymmetrically exposed and should widen execution tolerances and increase funding buffers.

Bottom line: T+1 lowered systemic settlement risk, but it sharpened the FTD signal. Through Aug. 31, 2026 the market shows fewer total fails but more concentrated, persistent problems in small caps, event‑driven issuers and high‑gamma option names. For active and options traders the signal is actionable—if you read the files, demand operational KPIs from brokers, and build faster pre‑borrow and liquidity buffers into your workflows.

Sarah Chen is Senior Financial Analyst at Stock Market Pulse. She analyzed SEC FTD files for this report.