UNEXPLAINED MOVE · HALT · MOVER · MON SEP 28 2026

Why ACET was halted on Sep 28 2026: phase one data

ACET-20.6%on Mon Sep 28 2026

Adicet Bio, Inc. Common Stock was down 20.6% on the day at $7.16, ranked #820 on 54.6× its usual five-minute volume, when TapeRank recorded this trading halt at 09:31 ET during regular hours when it was halted. TapeRank recorded 3 events for ACET that day, between 04:01 and 09:41 ET, and each is in the timeline below.

THE DAY ON THE LIST · 3 EVENTS

  1. 04:01 ET
    UNEXPLAINED MOVE · PRE-MARKET

    $10.56 · ▲ 17.1% ON THE DAY · — 5M RVOL · RANK #14

    UNEXPLAINEDNO FILINGS · RULE

    ACET is up 17.1% on the day on no measurable its normal volume for this time of day. No filings or headlines were found in SEC EDGAR filings and Benzinga wire headlines in the last 24 hours, so this is order flow rather than a disclosed catalyst.

    WHYNo filings or headlines within 24 hours of the move.
    ANALYZED 04:01 ET · <1 MIN AGO · RULE, NO MODEL
    THE ROW AND SESSION LEVELS AT 04:01 ET
    LAST10.56
    DAY▲ 17.1%
    5 MIN▲ 3.43%
    5M RVOL—
    5M $VOL$32K
    FLOAT*9.4M
    RANK#14
    SESSIONPRE-MARKET
    VWAP10.46
    HOD10.59
    LOD10.21
    OR HIGH—
    OR LOW—
    PREV CLOSE9.02
    PM HIGH10.59
    PM LOW10.21
    GAP▲ 17.07% (indicated)

    * FLOAT IS SHARES OUTSTANDING; TRUE FREE FLOAT IS NOT AVAILABLE

    — MEANS THE LEVEL DID NOT EXIST YET AT THAT INSTANT, NOT ZERO

  2. 09:31 ET
    HALT · REGULAR

    HALTED AT $7.16 · ▼ 20.6% ON THE DAY · 54.6× 5M RVOL · RANK #820

    STRETCHEDCONFIDENCE4/5

    ACET is down 9.6% despite reporting positive Phase 1 lupus data, including 54% DORIS remission and 50% complete renal response at 12 months. The decline conflicts with the headline data, while the small, preliminary 22-patient study and future pivotal-trial plans provide limited support for a sharp sustained repricing.

    WHYA 9.6% drop is a substantial move relative to preliminary positive Phase 1 results, but the limited 22-patient sample and non-pivotal status make the reaction directionally contradictory rather than fully justified.
    ANALYZED 09:23 ET · 8 MIN AGO · OPENAI/GPT-5.6-LUNA
    THE ROW AND SESSION LEVELS AT 09:31 ET
    LAST7.16
    DAY▼ 20.6%
    5 MIN▼ 10.39%
    5M RVOL54.6×
    5M $VOL$314K
    FLOAT*9.4M
    RANK#820
    SESSIONREGULAR
    VWAP9.01
    HOD10.82
    LOD7.16
    OR HIGH7.96
    OR LOW7.16
    PREV CLOSE9.02
    PM HIGH10.82
    PM LOW7.59
    GAP▼ 11.75%

    * FLOAT IS SHARES OUTSTANDING; TRUE FREE FLOAT IS NOT AVAILABLE

  3. 09:41 ET
    MOVER · REGULAR

    $6.51 · ▼ 27.8% ON THE DAY · 67.9× 5M RVOL · RANK #5

    The same verdict as at 09:31 ET.

    THE ROW AND SESSION LEVELS AT 09:41 ET
    LAST6.51
    DAY▼ 27.8%
    5 MIN▼ 11.67%
    5M RVOL67.9×
    5M $VOL$510K
    FLOAT*9.4M
    RANK#5
    SESSIONREGULAR
    VWAP8.56
    HOD10.82
    LOD6.67
    OR HIGH7.96
    OR LOW7.16
    PREV CLOSE9.02
    PM HIGH10.82
    PM LOW7.59
    GAP▼ 11.75%

    * FLOAT IS SHARES OUTSTANDING; TRUE FREE FLOAT IS NOT AVAILABLE

THE SESSION

  • 09:30 ETOpened at $7.96, -11.8% on the previous close of $9.02
  • 09:30 ETRegular-session high, $7.96
  • 09:30 ETHalted (LUDP); resumed 09:35 ET, after 5 minutes
  • 15:59 ETRegular-session low, $6.25
  • 15:59 ETLast trade of the regular session, $6.26, -30.6% on the previous close of $9.02
  • Volume: 1.7M shares in regular hours, 381K before the open

ACET opened at $7.96 after an unexplained premarket move that had reached $10.56, then halted at 09:30 ET and resumed five minutes later at a sharply lower level. TapeRank recorded the stock among the top movers at 09:41 ET at $6.51, and it later reached a $6.25 low before ending the regular session at $6.26, down 30.6% from the previous close. TapeRank tied the move to Adicet Bio’s Phase 1 lupus data, which showed positive remission and renal-response results, but read the reaction as stretched given the preliminary 22-patient study; it also noted no filings or headlines within 24 hours explaining the earlier move.

WRITTEN THU OCT 15 2026 17:57 ET BY OPENAI/GPT-5.6-LUNA FROM THE FACTS ON THIS PAGE

FILINGS AND NEWS · 24H BEFORE THE MOVE

On the tape right now

WHERE THE LIST STOODWED NOV 4 2026 · 13:49 ETRECORDED LIVE · 742 QUALIFY

01
ECGSURGING 0:05
79.71
▼ 29.3%
▼ 1.41%
41.0×
FAD
$6.2M
51.1M*
STRETCHED
02
CAVASURGING 0:00
64.78
▲ 7.4%
▲ 1.30%
9.3×
ORBHODVWH
$11.6M
116.8M*
UNEXPLAINED
03
URGNSURGING 0:00
29.16
▼ 15.2%
▼ 1.29%
15.6×
FAD
$1.4M
48.9M*
JUSTIFIED
04
MPTISURGING 0:00
64.15
▼ 1.5%
▲ 0.96%
23.8×
VWH
$637K
4.3M*
UNEXPLAINED
05
LSPDSURGING 0:00
11.52
▲ 4.9%
▼ 1.24%
16.5×
ORB
$426K
133.3M*
UNEXPLAINED
06
CRCTSURGING 0:00
8.90
▲ 49.2%
▼ 0.72%
15.1×
GAPORBVWHEXT
$395K
54.7M*
STRETCHED
07
BROSSURGING 0:00
43.97
▲ 0.9%
▼ 0.91%
4.0×
FAD
$4.3M
137.9M*
UNEXPLAINED
08
LMRICOOLING 1:35
12.85
▲ 14.5%
▲ 1.06%
132×
ORBHODVWH
$1.7M
—
UNEXPLAINED
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