Ranked by the close-to-close change of the trading session each announcement landed in. How this is measured.
Data as of the trading session of
,
20
of 21 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 09/02/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/16/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/10/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
Five sessions later the drop was 4.4% bigger, at -62.20%.
Month end -60.98% on 2021-09-30
Close before and after
$15.53 to $6.28 split-adjusted
Session open, high, low
$7.01, $7.58, $6.00
Opening gap
-54.86%
Close inside the session range
0.18 of the range, where 1.00 is the high
Session volume
16,869,973 shares, $105,943,430
Relative volume
35.3x the median of the 20 sessions before the pre-news close
Baseline gap
3 calendar days from the pre-news close to the measured session
4
METXAlso on the opposite board this monthon both boards
-57.18%
against the close of 09/01/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/08/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
Five sessions later the drop was 18.3% bigger, at -55.92%.
Month end -60.75% on 2021-09-30
Close before and after
$15.11 to $7.97 as traded
Session open, high, low
$6.11, $8.27, $6.09
Opening gap
-59.56%
Close inside the session range
0.86 of the range, where 1.00 is the high
Session volume
35,116,871 shares, $279,881,462
Relative volume
43.2x 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
6
APLSMore than one ranked move this month2+ ranked moves
-37.19%
against the close of 09/09/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/16/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/08/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
19.7% of the drop was recovered five sessions later.
Month end -42.65% on 2021-09-30
Close before and after
$8.30 to $5.40 as traded
Session open, high, low
$6.42, $6.69, $5.03
Opening gap
-22.65%
Close inside the session range
0.22 of the range, where 1.00 is the high
Session volume
3,132,334 shares, $16,914,604
Relative volume
18.4x 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
9
BYSIMore than one ranked move this month2+ ranked moves
-32.96%
against the close of 09/17/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
4.5% of the drop was recovered five sessions later.
Month end -31.21% on 2021-09-30
Close before and after
$22.91 to $15.36 split-adjusted
Session open, high, low
$18.30, $19.70, $15.14
Opening gap
-20.12%
Close inside the session range
0.05 of the range, where 1.00 is the high
Session volume
5,017,811 shares, $77,073,577
Relative volume
4.0x the median of the 20 sessions before the pre-news close
Baseline gap
3 calendar days from the pre-news close to the measured session
10
HLBZMore than one ranked move this monthAlso on the opposite board this month2+ ranked moveson both boards
-32.03%
against the close of 09/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/21/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
Five sessions later the drop was 80.7% bigger, at -44.98%.
Month end -43.26% on 2021-09-30
Close before and after
$11.65 to $8.75 split-adjusted
Session open, high, low
$9.45, $9.69, $8.50
Opening gap
-18.88%
Close inside the session range
0.21 of the range, where 1.00 is the high
Session volume
3,754,937 shares, $32,855,699
Relative volume
28.5x 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
12
IMPLMore than one ranked move this month2+ ranked moves
-23.76%
against the close of 09/09/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/15/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
Five sessions later the drop was 6.9% bigger, at -25.39%.
Month end -23.94% on 2021-09-30
Close before and after
$27.53 to $20.99 split-adjusted
Session open, high, low
$26.90, $26.90, $19.35
Opening gap
-2.29%
Close inside the session range
0.22 of the range, where 1.00 is the high
Session volume
4,279,755 shares, $89,832,057
Relative volume
7.8x 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
14
SBTXMore than one ranked move this month2+ ranked moves
-23.35%
against the close of 09/10/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
Five sessions later the drop was 65.7% bigger, at -38.68%.
Month end -48.66% on 2021-09-30
Close before and after
$19.44 to $14.90 as traded
Session open, high, low
$14.79, $15.53, $14.10
Opening gap
-23.92%
Close inside the session range
0.56 of the range, where 1.00 is the high
Session volume
1,150,450 shares, $17,141,705
Relative volume
3.9x the median of the 20 sessions before the pre-news close
Baseline gap
3 calendar days from the pre-news close to the measured session
15
SBTXMore than one ranked move this month2+ ranked moves
-23.08%
against the close of 09/15/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/03/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/29/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/15/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/13/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
11.8% of the drop was recovered five sessions later.
Month end -21.87% on 2021-09-30
Close before and after
$54.24 to $42.78 split-adjusted
Session open, high, low
$48.10, $49.09, $42.50
Opening gap
-11.32%
Close inside the session range
0.04 of the range, where 1.00 is the high
Session volume
10,142,275 shares, $433,886,525
Relative volume
14.1x 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
21
ONTXAlso on the opposite board this monthon both boards
-20.94%
against the close of 09/23/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/10/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/21/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/21/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/02/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
9.7% of the drop was recovered five sessions later.
Month end -12.70% on 2021-09-30
Close before and after
$12.76 to $10.28 as traded
Session open, high, low
$10.62, $11.50, $10.20
Opening gap
-16.74%
Close inside the session range
0.06 of the range, where 1.00 is the high
Session volume
5,391,320 shares, $55,422,770
Relative volume
15.0x 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
27
IMPLMore than one ranked move this month2+ ranked moves
-19.33%
against the close of 09/02/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/08/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/09/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
51.4% of the drop was recovered five sessions later.
Month end -14.60% on 2021-09-30
Close before and after
$26.72 to $21.65 split-adjusted
Session open, high, low
$25.46, $25.67, $21.25
Opening gap
-4.72%
Close inside the session range
0.09 of the range, where 1.00 is the high
Session volume
3,620,844 shares, $78,391,273
Relative volume
7.2x 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
32
HLBZMore than one ranked move this monthAlso on the opposite board this month2+ ranked moveson both boards
-18.82%
against the close of 09/17/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/13/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/01/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/08/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/08/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/13/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/03/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/01/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/09/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
Five sessions later the drop was 6.2% bigger, at -17.07%.
Month end -20.76% on 2021-09-30
Close before and after
$15.99 to $13.42 split-adjusted
Session open, high, low
$16.50, $16.50, $13.05
Opening gap
+3.19%
Close inside the session range
0.11 of the range, where 1.00 is the high
Session volume
215,416 shares, $2,890,883
Relative volume
1.6x 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
41
DVAXAlso on the opposite board this monthon both boards
-16.01%
against the close of 09/10/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/14/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/14/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/03/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
Five sessions later the drop was 4.8% bigger, at -16.05%.
Month end -12.92% on 2021-09-30
Close before and after
$104,064.00 to $88,128.00 as traded
Session open, high, low
$105,600.00, $105,600.00, $87,840.00
Opening gap
+1.48%
Close inside the session range
0.02 of the range, where 1.00 is the high
Session volume
688 shares, $60,632,064
Relative volume
4.3x the median of the 20 sessions before the pre-news close
Baseline gap
4 calendar days from the pre-news close to the measured session
45
HLBZMore than one ranked move this monthAlso on the opposite board this month2+ ranked moveson both boards
-15.30%
against the close of 09/23/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/17/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/10/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
7.5% of the drop was recovered five sessions later.
Month end -20.43% on 2021-09-30
Close before and after
$22.22 to $18.87 split-adjusted
Session open, high, low
$19.87, $20.35, $18.44
Opening gap
-10.58%
Close inside the session range
0.23 of the range, where 1.00 is the high
Session volume
5,987,911 shares, $112,991,881
Relative volume
5.0x the median of the 20 sessions before the pre-news close
Baseline gap
3 calendar days from the pre-news close to the measured session
48
SPIRAlso on the opposite board this monthon both boards
-14.94%
against the close of 09/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
Five sessions later the drop was 278.8% bigger, at -56.59%.
Month end -12.13% on 2021-09-30
This month ended before the fifth session after the move.
Close before and after
$114.08 to $97.04 split-adjusted
Session open, high, low
$112.16, $115.76, $96.24
Opening gap
-1.68%
Close inside the session range
0.04 of the range, where 1.00 is the high
Session volume
118,637 shares, $11,512,534
Relative volume
2.1x 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
49
IRNTAlso on the opposite board this monthon both boards
-14.88%
against the close of 09/29/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/01/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/29/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/29/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/21/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/03/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/17/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/13/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 08/31/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/17/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
Five sessions later the drop was 90.2% bigger, at -26.06%.
Month end -27.05% on 2021-09-30
Close before and after
$28.17 to $24.31 split-adjusted
Session open, high, low
$26.35, $26.93, $23.84
Opening gap
-6.46%
Close inside the session range
0.15 of the range, where 1.00 is the high
Session volume
1,771,359 shares, $43,061,737
Relative volume
5.0x the median of the 20 sessions before the pre-news close
Baseline gap
3 calendar days from the pre-news close to the measured session
61
WKEYAlso on the opposite board this monthon both boards
-13.59%
against the close of 09/17/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/13/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
71.2% of the drop was recovered five sessions later.
Month end -11.51% on 2021-09-30
Close before and after
$30.40 to $26.27 as traded
Session open, high, low
$28.21, $29.51, $26.04
Opening gap
-7.20%
Close inside the session range
0.07 of the range, where 1.00 is the high
Session volume
742,578 shares, $19,507,524
Relative volume
7.1x 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
63
HLBZMore than one ranked move this monthAlso on the opposite board this month2+ ranked moveson both boards
-13.57%
against the close of 09/21/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/17/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/01/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/09/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
24.8% of the drop was recovered five sessions later.
Month end -12.13% on 2021-09-30
Close before and after
$23.90 to $20.80 split-adjusted
Session open, high, low
$20.95, $21.43, $20.00
Opening gap
-12.34%
Close inside the session range
0.56 of the range, where 1.00 is the high
Session volume
491,317 shares, $10,219,394
Relative volume
7.2x 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
68
APLSMore than one ranked move this month2+ ranked moves
-12.88%
against the close of 09/03/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/16/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/08/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/29/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
18.4% of the drop was recovered five sessions later.
Month end -12.63% on 2021-09-30same session
This month ended before the fifth session after the move.
Close before and after
$146.45 to $127.96 split-adjusted
Session open, high, low
$133.21, $135.98, $127.95
Opening gap
-9.04%
Close inside the session range
0.00 of the range, where 1.00 is the high
Session volume
5,839,723 shares, $747,250,955
Relative volume
5.9x 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
72
BYSIMore than one ranked move this month2+ ranked moves
-12.59%
against the close of 09/03/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/13/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/10/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/24/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/17/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/17/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/21/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/20/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/28/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/08/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/09/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/17/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/17/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/13/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/29/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/01/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/03/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/09/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/20/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
Five sessions later the drop was 137.6% bigger, at -25.95%.
Month end -27.78% on 2021-09-30
Close before and after
$9.25 to $8.24 as traded
Session open, high, low
$9.25, $9.44, $7.80
Opening gap
0.00%
Close inside the session range
0.27 of the range, where 1.00 is the high
Session volume
1,045,520 shares, $8,615,085
Relative volume
11.3x 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
95
RCATAlso on the opposite board this monthon both boards
-10.83%
against the close of 09/27/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/07/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/08/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
against the close of 09/10/2021session reconstructedSession detailMarket cap is not shown on months older than a year, because only today's figure exists.
Five sessions later the drop was 144.3% bigger, at -25.90%.
Month end -19.72% on 2021-09-30
Close before and after
$28.96 to $25.89 as traded
Session open, high, low
$29.00, $29.11, $25.50
Opening gap
+0.14%
Close inside the session range
0.11 of the range, where 1.00 is the high
Session volume
80,661 shares, $2,088,313
Relative volume
1.9x the median of the 20 sessions before the pre-news close
Baseline gap
3 calendar days 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.646 smaller events this month are held out of this month's eligible pool; switch to include them.201 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.
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 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 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 September 2021, the median decliner was 12.5% deeper below its pre-news close five sessions later; the largest catalyst group was Other Announcement, 32 of the 100 events, at a median of -12.7%.
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.
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.
7 other catalyst types, 18 events: FDA & Regulatory, Contract / Partnership, Leadership Change, Index Inclusion, Reverse Merger / Shell, Guidance Change, Crypto & Treasury.
Median change since the measured close as a share of the drop
Day +1
99.0% of 100
2.9%deeper below baseline, of 100
Day +5
99.0% of 98
12.5%deeper below baseline, of 98
Month end
95.7% of 92
15.0%deeper below baseline, of 92
Month end falls before day +5 for 13 of these 92 events, so this row is not a later horizon than the one above it. 92 of the 100 events have a month-end close later than the measured session; 6 have it on the measured session itself, and 2 have 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 September 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-market57.0%
Intraday3.0%
After hours40.0%
Volume against normal
Under 5x40 events, 40.0%
5x to 20x41 events, 41.0%
Over 20x19 events, 19.0%
Industry
Pharmaceutical Preparations18 events, 18.0%
Services-prepackaged Software6 events, 6.0%
Biological Products, (no Diagnostic Substances)4 events, 4.0%
Hospital & Medical Service Plans2 events, 2.0%
Motor Vehicles & Passenger Car Bodies2 events, 2.0%
Aircraft1 event, 1.0%
23 other industries, 23 events
Industry not known: 44.0%
3 events on this board carry the flag for a move that ran against its own release, too few to say whether the flag predicts anything.
Against August 2021
100 events in the comparable window.
August 2021 median -23.0%, selected from the 9,172 events in that month's eligible pool
September 2021 median -14.5%, 8.5 points shallower than August 2021. September 2021's median is taken over the 100 ranked rows, selected from the 8,608 events in that month's eligible pool.
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.
