Ranked by the close-to-close change of the trading session each announcement landed in. How this is measured.
Data through the
session.
18
of 19 completed market sessions produced ranked moves.
That date is the last ranked session, not the last priced one, so follow-through dates run later.
On 100 of these rows the measured session was reconstructed from the announcement time, because it predates our stored session records.
Every percentage on a row, the follow-through readings included, is measured against that row's own pre-news close, which the row names. A day +5 reading is therefore the move from before the announcement, not a further change on top of the headline percentage.
Rows are ordered by the move measured when the board was ranked. A percentage recomputed from the session's own closing prices can sit a little above or below its neighbours; the rank is the one the measured move gave the row.
against the close of 01/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/05/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/14/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/04/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 12/31/2020session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/20/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/08/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/06/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/22/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/19/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/20/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/20/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/04/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/19/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/19/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/14/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/20/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/08/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/15/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/25/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/08/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 12/31/2020session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
7.4% of the drop was recovered five sessions later.
Month end -20.99% on
Close before and after
$22.49 to $19.10 as traded
Session open, high, low
$23.20, $23.23, $18.48
Opening gap
+3.16%
Close inside the session range
0.13 of the range, where 1.00 is the high
Session volume
10,650,746 shares, $203,429,249
Baseline gap
4 calendar days from the pre-news close to the measured session
45
EDITMore than one ranked move this month2+ ranked moves
-15.06%
against the close of 01/08/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/05/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 12/31/2020session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/11/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/21/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/12/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/15/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/15/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/20/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/25/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/12/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/12/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/14/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/15/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/04/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/20/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/12/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/21/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/12/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/22/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/14/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/19/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/04/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/05/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/11/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/12/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/26/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
30.0% of the drop was recovered five sessions later.
Month end -26.27% on
This month ended before the fifth session after the move.
Close before and after
$90.00 to $80.00 split-adjusted
Session open, high, low
$82.00, $88.86, $78.00
Opening gap
-8.89%
Close inside the session range
0.18 of the range, where 1.00 is the high
Session volume
3,753,861 shares, $300,308,880
Relative volume
1.4x the median of the 20 sessions before the pre-news close
Baseline gap
1 calendar day from the pre-news close to the measured session
96
EDITMore than one ranked move this month2+ ranked moves
-11.11%
against the close of 01/20/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/15/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/20/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 01/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
41.9% of the drop was recovered five sessions later.
Month end -10.94% on same session
This month ended before the fifth session after the move.
Close before and after
$18.45 to $16.43 as traded
Session open, high, low
$18.03, $18.38, $16.37
Opening gap
-2.27%
Close inside the session range
0.03 of the range, where 1.00 is the high
Session volume
985,428 shares, $16,187,921
Relative volume
1.3x the median of the 20 sessions before the pre-news close
Baseline gap
1 calendar day from the pre-news close to the measured session
NYSE and Nasdaq companies with a market capitalization of $25M or more, measured today. The exchange is the one recorded on each announcement, and a release naming several tickers records one venue for all of them. A session that changed hands for less than $25,000 in total is not ranked, because a percentage set by a handful of shares is a print rather than a move. On a board older than a year a fund is identified by its name alone, because an instrument class describes whoever holds the ticker today.280 smaller events this month are held out of this month's eligible pool; switch to include them.86 events never entered this month's eligible pool, because the ticker is a warrant, a unit, a right or a preferred rather than common stock, or carries a stored capitalization above $10 trillion, which is larger than any company has reached.Include the $5M to $25M band
5 candidate events for this board could not be anchored to a trading session and are not listed.
2 events were left out of this board because the stored move and the session's own closing prices disagree by far more than a measurement difference, so neither figure could be published.
1 event was left out of this board because the vendor names the ticker as a preferred, a note, a depositary share or a fund rather than a company's common stock.
1 event was left out of this board because the ticker trades over the counter rather than on NYSE or Nasdaq, and no announcement naming it alone has ever recorded a listed exchange.
1 event was left out of this board because the price series changes basis between the baseline close and the measured one, so the two prices do not describe the same shares of the same company and their ratio measures a corporate action, or a change in what the ticker identifies, rather than a move.
1 event was left out of this board because the measured session set no price of its own, trading either nothing at all or barely moving on an ordinary day's volume, so the figure it would be ranked on is a price carried onto the tape rather than a close.
2 events were left out of this board because the ticker had not traded for more than 10 days before the measured session, so no comparable prior close exists.
Company names are not shown on months older than a year, because only the current holder of each ticker is known.
Whole board, unfiltered
In January 2021, the median decliner had recovered 16.6% of its drop five sessions later; the largest catalyst group was Offering / Dilution, 45 of the 100 events, at a median of -14.9%.
Close-to-close change on the measured trading session, against the previous close.
NYSE and Nasdaq companies with a market capitalization of $25M or more, measured today. The exchange is the one recorded on each announcement, and a release naming several tickers records one venue for all of them. A session that changed hands for less than $25,000 in total is not ranked, because a percentage set by a handful of shares is a print rather than a move. On a board older than a year a fund is identified by its name alone, because an instrument class describes whoever holds the ticker today.
Only 9 of these 10 events have a five-session follow-up, so no median is shown.
Only 9 of these 10 events have a five-session follow-up, so no share is shown.
Clinical Trial Results
8
8.0%
Fewer than 10 events in this group, so no figures are shown.
Guidance Change
3
3.0%
Fewer than 10 events in this group, so no figures are shown.
The day +5 figures are measured over the events in each group that have a five-session close, the count printed beside them, not over every event in the group.
Median change since the measured close as a share of the drop
Day +1
97.0% of 99
3.3%recovered, of 99
Day +5
82.8% of 99
16.6%recovered, of 99
Month end
87.5% of 88
7.8%larger drop, of 88
Month end falls before day +5 for 36 of these 88 events, so this row is not a later horizon than the one above it. 88 of the 100 events have a month-end close later than the measured session; 11 have it on the measured session itself, and 1 has no month-end close.
Both figures in a row are measured over the events that have a close at that horizon, the count printed beside each of them, not over all 100 events on this board, which is why the denominators differ between rows.
Repeat runners
Some companies move on news more than once. The left list holds the ones that moved twice or more this month; the right list holds the ones that also moved in the months before it. The ranking above shows one row per move, so a name that keeps coming back is only visible here.
Moved twice or more inside January 2021
Two or more ranked moves this month, each on a different trading day.
Price bands are not shown on months older than a year, because the stored prices are adjusted for splits done since and a company that has reverse-split lands in a band its shares never traded in.
When the announcement landed
Pre-market46.0%
Intraday10.0%
After hours44.0%
Volume against normal
Under 5x51 events, 52.0%
5x to 20x37 events, 37.8%
Over 20x10 events, 10.2%
2 events have too little trading history for a relative volume, and are not in the tiers above.
Surgical & medical instruments & apparatus3 events, 3.0%
Communications equipment, not elsewhere classified2 events, 2.0%
Electric & other services combined2 events, 2.0%
31 other industries, 32 events
Industry not known: 38.0%
Against December 2020
100 events from December 2020 in the comparable window.
December 2020 median -19.1%, selected from the 6,026 events in that month's eligible pool.
January 2021 median -14.5%, 4.6 points shallower than December 2020. January 2021's median is taken over the 100 ranked rows, selected from the 7,526 events in that month's eligible pool.
The two windows drew on pools of very different size, so part of the gap between the medians is how deep into each pool the top hundred reaches rather than how severe the moves were.
How this ranking is measured
Close-to-close change on the measured trading session, against the previous close.
An announcement before 16:00 ET is measured on that trading day; one at or after 16:00 ET, or on a weekend, is measured on the next trading day.
One row per company and measured session. Other announcements the company made in the same session are listed inside the row.
A ranking is a coincidence of news and price on the same session, not proof that the news caused the move. Part of an intraday move can precede the announcement.
No Stated Cause marks a release in which the company itself says it knows of no reason for the move, while Other Announcement marks a release these rules could not classify.
Eligibility uses each company's capitalization today, not its capitalization at the time. Archive boards can therefore change as companies grow or shrink.
Prices are adjusted for stock splits the company has done since, so an older row's dollar figures are stated on today's share count and are not the prices that traded that day. The percentage move, the dollar volume and the relative volume are unaffected, because both prices carry the same adjustment. The session's share count carries the adjustment too, so the shares figure beside the dollar volume is that count restated on today's basis rather than the number of shares that changed hands. Where the ticker was retired the price series stops with it and no later adjustment reached it, so those rows are marked as traded and their dollars are the ones that changed hands on the day.
Market cap is not shown on months older than a year, because only today's figure exists.
NYSE and Nasdaq companies with a market capitalization of $25M or more, measured today. The exchange is the one recorded on each announcement, and a release naming several tickers records one venue for all of them. A session that changed hands for less than $25,000 in total is not ranked, because a percentage set by a handful of shares is a print rather than a move. On a board older than a year a fund is identified by its name alone, because an instrument class describes whoever holds the ticker today.
On 100 of these rows the measured session was reconstructed from the announcement time, because it predates our stored session records.
This archive starts at 2020-04, the first month with ranked moves.
