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Morning movers: Ross jumps 9.0% after a traffic-led quarter

Ross Stores rose 9.04% in delayed pre-market trading after traffic drove a strong quarter and raised outlook. OSI Systems fell 14.50% on weaker quarterly revenue, while Flowers Foods slipped 3.80% after lowering guidance.

YieldCove Desk

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Ross Dress for Less storefront and entrance across a busy Pittsburgh parking lot
Photo: Nicholas Eckhart / Wikimedia Commons — CC BY 2.0 (cropped)

The Morning Read covers the broader rebound. These delayed pre-market quotes were requested at 05:43 ET on 21 August 2026 and compared with a second scan near 05:38 ET; early trading can change quickly.

Three earnings reactions, three different messages

ROST was +9.04% at $249.68 after traffic-led sales growth and a raised outlook. OSIS was -14.50% at $186.46 as quarterly revenue contracted despite record annual metrics, while FLO was -3.80% at $6.83 after weaker volume and lower guidance.

TickerPre-market moveDelayed priceConfirmed catalyst
ROST+9.04%$249.68Q2 sales, traffic and outlook beat
OSIS-14.50%$186.46Fiscal Q4 results and FY2027 guide
FLO-3.80%$6.83Q2 volume decline and reduced outlook
Featured movers — delayed pre-market snapshot requested at 05:43 ET on 21 August 2026

ROST: +9.04% as customer traffic drives a strong quarter

Ross Stores reported fiscal Q2 sales of $6.3 billion, up 13%, with comparable-store sales up 10% on customer traffic. Net income rose to $851 million from $508 million, and EPS reached $2.66, including about $0.60 from tariff refunds.

Delayed pre-market

$249.68

+9.04%

Prior close

$228.99

20 Aug 2026

Q2 comparable sales

+10%

Traffic-led

ROST wheel context: post-earnings liquidity still needs a live check

The delayed Cboe file showed 1,328 option series, 52,875 contracts of open interest and 60,045 contracts of prior-session volume. The earnings binary has passed, but options do not trade pre-market; the post-gap bid-ask spread and implied-volatility reset must be rebuilt after the open.

  • Why it matters: Ross raised fiscal 2026 EPS guidance to $8.61-$8.77, including the $0.60 refund, and expects Q3 comparable sales of +6% to +7%.
  • Objective level: the $249.68 print was $20.69 above the $228.99 close, the first support reference if the gap fades.
  • Peers: TJX and BURL can distinguish an off-price read-through from a Ross-specific win.
  • Main risk: investors may discount the one-time refund and focus on tougher second-half comparisons.

OSIS: -14.50% as a record year meets a weaker quarter

OSI Systems reported fiscal Q4 revenue of $484.1 million, down 4%, while GAAP EPS rose 8% to $3.27 and non-GAAP EPS rose 17% to $3.78. Fiscal-year revenue reached $1.786 billion, up 4%, and backlog was about $1.9 billion. Middle East conflicts shifted some deliveries rather than cancelling them.

Delayed pre-market

$186.46

-14.50%

Prior close

$218.09

20 Aug 2026

Fiscal Q4 revenue

$484.1M

-4% YoY

OSIS wheel context: the chain is comparatively thin

The delayed Cboe file showed 398 option series, 6,030 contracts of open interest and only 1,904 contracts of prior-session volume. A 14.5% share gap does not make that chain liquid; skip any premium comparison until live contract-level spreads are visible.

  • Why it matters: the market appears to emphasize quarterly revenue and delivery timing over record annual cash flow and EPS.
  • Guidance: fiscal 2027 revenue of $1.875-$1.930 billion and non-GAAP EPS of $11.13-$11.49.
  • Objective level: $186.46 was $31.63 below the $218.09 close; the opening auction matters more than a thin pre-market tick.
  • Main risk: deliveries could recover, or further disruption could prolong the timing problem.

FLO: -3.80% after bread volumes and guidance move lower

Flowers Foods said Q2 sales fell 4.0% to $1.193 billion as volume dropped 5.8%. Net income declined 30.3% to $40.7 million, and adjusted EPS fell to $0.21 from $0.30. Fiscal 2026 sales guidance fell to $5.070-$5.142 billion and adjusted EPS guidance to $0.75-$0.85.

Delayed pre-market

$6.83

-3.80%

Prior close

$7.10

20 Aug 2026

Q2 volume

-5.8%

Year over year

FLO wheel context: aggregate activity does not cure a narrow chain

The delayed Cboe file showed 64 option series, 24,939 contracts of open interest and 7,740 contracts of prior-session volume. The small listing set can concentrate activity, but only live bids, asks and strike-level open interest show whether a contract is usable.

  • Why it matters: weaker demand, marketing, labour and freight costs pressure sales and margins.
  • Objective level: $6.83 was $0.27 below the $7.10 close, near the recent low zone.
  • Peers: CAG and CPB can separate packaged-food pressure from company execution.
  • Main risk: cost actions and the Nature’s Own relaunch could improve the second half.

Also on the radar

  • MSTR +10.33% at $124.00 near 05:43 ET: the move tracked Bitcoin; no fresh issuer filing supplied a separate catalyst.
  • HL +4.13% at $21.68 near 05:32 ET: silver strength and a secondary-source analyst initiation kept Hecla active, but the exact target was not retained.
  • MRNA +2.62% at $136.81 near 05:43 ET: the stock rebounded after Thursday’s 23.55% drop, but yesterday’s Phase 3 story had already been featured.

What to watch today

  • 08:30 ET: Flowers Foods hosts its live results question-and-answer webcast.
  • 09:30 ET — opening auction: compare regular-session prices and volume with the delayed prints, especially the thin ROST and OSIS pre-market trades.
  • After 09:35 ET — option chains: rebuild bids, asks, implied volatility and strike-level liquidity before reading any premium.
  • Through the close: test whether ROST holds the traffic-led gap while OSIS and FLO stabilize around their prior-close references.
ROSTOSISFLO

Sources

  1. [1]Ross Stores fiscal Q2 2026 results — SEC Exhibit 99.1Ross Stores / SEC EDGAR · Accessed 2026-08-21 · Tier 1
  2. [2]OSI Systems fiscal Q4 and FY2026 results — SEC Exhibit 99.1OSI Systems / SEC EDGAR · Accessed 2026-08-21 · Tier 1
  3. [3]Flowers Foods Q2 2026 results — SEC Exhibit 99.1Flowers Foods / SEC EDGAR · Accessed 2026-08-21 · Tier 1
  4. [4]Ross Stores pre-market quoteCNBC · Accessed 2026-08-21 · Tier 2
  5. [5]OSI Systems pre-market quoteCNBC · Accessed 2026-08-21 · Tier 2
  6. [6]Flowers Foods pre-market quoteCNBC · Accessed 2026-08-21 · Tier 2
  7. [7]U.S. pre-market stock scanTradingView · Accessed 2026-08-21 · Tier 3
  8. [8]Ross Stores delayed options quote tableCboe · Accessed 2026-08-21 · Tier 1
  9. [9]OSI Systems delayed options quote tableCboe · Accessed 2026-08-21 · Tier 1
  10. [10]Flowers Foods delayed options quote tableCboe · Accessed 2026-08-21 · Tier 1
  11. [11]21 August 2026 Morning ReadYieldCove · Accessed 2026-08-21 · Tier 4
  12. [12]Ross Dress for Less storefront photograph and licenceNicholas Eckhart / Wikimedia Commons · Accessed 2026-08-21 · Tier 4

This content is for informational and educational purposes only and is not financial advice. Options involve risk and are not suitable for every investor. Do your own research before trading.

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