Statistics of Price Movements of General Motors Company (GM)

The price movements of General Motors Company (ticker GM) are summarized in five ways:

• Table 1. Statistics of daily price changes using the closing prices
• Table 2. Statistics of daily price changes using the closing and opening prices
• Table 3 – 7. Statistics of daily price changes when GM opened with an increase of 1%, 2%, 3%, 4%, or more than 5%
• Table 8 – 10. Statistics of stock price changes in the 20 days after GM had a big price move
• Table 11. Statistics of daily price changes in the 20 days after GM moved 5% with twice the 30-day average volume

The statistics are calculated using GM's price data across 1,549 trading days from 2015 to 2020.

Table 1. Statistics of GM one-day price changes

In this table, the one-day price change is calculated using the closing price and the previous day's closing price.

In the past 1,549 trading days, 49.7% of the time (769 days), GM closed above the previous day's closing price. 46.0% of the time (712 days), it closed below the previous day's closing price. 4.3% of the time (67 days), it did not change.

Also see: VIX price movement study.

GM Price Change (%)	Number of Days	% of Total Sessions
19 – 20%	1	0.06%
12 – 13%	1	0.06%
9 – 10%	3	0.19%
8 – 9%	3	0.19%
7 – 8%	6	0.39%
6 – 7%	5	0.32%
5 – 6%	11	0.71%
4 – 5%	18	1.16%
3 – 4%	35	2.26%
2 – 3%	73	4.72%
1 – 2%	191	12.34%
0 – 1%	422	27.26%
0%	67	4.33%
0 – -1%	361	23.32%
-1 – -2%	186	12.02%
-2 – -3%	82	5.30%
-3 – -4%	41	2.65%
-4 – -5%	25	1.61%
-5 – -6%	7	0.45%
-6 – -7%	4	0.26%
-7 – -8%	2	0.13%
-11 – -12%	1	0.06%
-13 – -14%	1	0.06%
-15 – -16%	1	0.06%
-17 – -18%	1	0.06%

Table 2. Statistics of GM: Closing vs. Open

In this table, instead of using the closing price of the previous day, the opening price is used to calculate the one-day price change of GM.

47.1% of the time (729 days), GM closed above the opening price. 48.7% of the time (754 days), it closed below the opening price. 4.3% of the time (66 days), it closed where it started.

Closing - Open (%)	Number of Days	% of Total Sessions
9 – 10%	1	0.06%
8 – 9%	1	0.06%
7 – 8%	1	0.06%
6 – 7%	1	0.06%
5 – 6%	4	0.26%
4 – 5%	13	0.84%
3 – 4%	21	1.36%
2 – 3%	57	3.68%
1 – 2%	181	11.68%
0 – 1%	449	28.99%
0%	66	4.26%
0 – -1%	426	27.50%
-1 – -2%	212	13.69%
-2 – -3%	63	4.07%
-3 – -4%	29	1.87%
-4 – -5%	17	1.10%
-5 – -6%	4	0.26%
-6 – -7%	2	0.13%
-10 – -11%	1	0.06%

Table 3. One-day performance when GM opened 5% higher than previous close

In the past 1,549 trading days, GM opened more than 5% higher than the previous day's closing price 20 times. Of these days, 55.0% (11 days) had closing prices above the opening price, and 45.0% (9 days) had closing prices below the opening price.

Closing - Open (%)	Number of Days	% of Total Sessions
9 – 10%	1	5.00%
4 – 5%	1	5.00%
3 – 4%	1	5.00%
2 – 3%	4	20.00%
1 – 2%	2	10.00%
0 – 1%	2	10.00%
-1 – -2%	2	10.00%
-2 – -3%	2	10.00%
-3 – -4%	1	5.00%
-4 – -5%	1	5.00%
-5 – -6%	1	5.00%
-6 – -7%	2	10.00%

Table 4. Closing vs. open when GM opened 4–5% higher

On 8 days, GM opened 4–5% higher than the previous day's closing price. Of these days, 25.0% (2 days) had closing prices above the opening price, and 75.0% (6 days) had closing prices below the opening price.

Closing - Open (%)	Number of Days	% of Total Sessions
1 – 2%	1	12.50%
0 – 1%	1	12.50%
0 – -1%	1	12.50%
-1 – -2%	1	12.50%
-2 – -3%	2	25.00%
-4 – -5%	2	25.00%

Table 5. Closing vs. open when GM open 3 – 4% higher

11 times GM opened 3 – 4% higher than the previous day's closing price. Among these days, 45.5% (5 days) closed above the opening price, 54.5% (6 days) closed below the opening price.

Closing - Open (%)	Number of Days	% of Total Sessions
2 – 3%	1	9.09%
1 – 2%	2	18.18%
0 – 1%	2	18.18%
0 – -1%	1	9.09%
-1 – -2%	2	18.18%
-2 – -3%	2	18.18%
-4 – -5%	1	9.09%

Table 6. Closing vs. open when GM open 2 – 3% higher

34 times GM opened 2 – 3% higher than the previous day's closing price. Among these days, 55.9% (19 days) closed above the opening price, 44.1% (15 days) closed below the opening price.

Closing - Open (%)	Number of Days	% of Total Sessions
6 – 7%	1	2.94%
4 – 5%	2	5.88%
3 – 4%	4	11.76%
2 – 3%	2	5.88%
1 – 2%	5	14.71%
0 – 1%	5	14.71%
0 – -1%	6	17.65%
-1 – -2%	3	8.82%
-2 – -3%	4	11.76%
-4 – -5%	2	5.88%

Table 7. Closing vs. open when GM open 1 – 2% higher

114 times GM opened 1 – 2% higher than the previous day's closing price. Among these days, 50.0% (57 days) closed above the opening price, 50.0% (57 days) closed below the opening price.

Closing - Open (%)	Number of Days	% of Total Sessions
4 – 5%	3	2.63%
2 – 3%	6	5.26%
1 – 2%	19	16.67%
0 – 1%	29	25.44%
0 – -1%	29	25.44%
-1 – -2%	18	15.79%
-2 – -3%	5	4.39%
-3 – -4%	4	3.51%
-4 – -5%	1	0.88%

Table 8. Periods when GM moved 15% or more

In this table, we track the price movements in the 20 days after GM had a one-day price change of at least 15%.

Date	Price Change	Price Change after 15% Move
Days after:		1	4	7	10	13	16	19
20200324	19.9%	1.8	1.0	-13.8	.9	14.0	2.6	6.0
20200316	-15%	-3.2	-13.6	2.3	1.5	-13.4	1.4	14.6
20200318	-17.3%	5.4	25.7	27.3	14.6	16.4	43.2	36.8

Table 8a. GM average price changes following a 15% up day

Of the 1,549 trading days from 2015 to 2020, there were 1 days in which GM was up more than 15%. This table shows the average price changes over the 1 days.

Average Type	Average Price Change
Days after:	1	4	7	10	13	16	19
Avg for Change ≥ 15%	1.8	1.0	-13.8	.9	14.0	2.6	6.0

Table 8b. GM average price changes following a 15% down day

Of the 1,549 trading days from 2015 to 2020, there were 2 days in which GM was down more than -15%. This table shows the average price changes over the 2 days.

Average Type	Average Price Change
Days after:	1	4	7	10	13	16	19
Avg for Change ≥ -15%	1.1	6.0	14.8	8.1	1.5	22.3	25.7

Table 9. Periods when GM moved 10% or more

In this table, we track the price movements in the 20 days after GM had a one-day price change of at least 10%.

Date	Price Change	Price Change after 10% Move
Days after:		1	4	7	10	13	16	19
20200324	19.9%	1.8	1.0	-13.8	.9	14.0	2.6	6.0
20180531	12.8%	1.2	2.9	5.0	2.0	-1.0	-3.4	-5.5
20200312	-11.3%	7.2	-27.1	-23.6	-2.1	-9.8	-21.7	.4
20200309	-13.9%	9.8	.1	-32.0	-28.7	-8.6	-15.8	-26.9
20200316	-15%	-3.2	-13.6	2.3	1.5	-13.4	1.4	14.6
20200318	-17.3%	5.4	25.7	27.3	14.6	16.4	43.2	36.8

Table 9a. GM average price changes following a 10% up day

Of the 1,549 trading days from 2015 to 2020, there were 2 days in which GM was up more than 10%. This table shows the average price changes over the 2 days.

Average Type	Average Price Change
Days after:	1	4	7	10	13	16	19
Avg for Change ≥ 10%	1.5	1.9	-4.4	1.5	6.5	-.4	.3

Table 9b. GM average price changes following a 10% down day

Of the 1,549 trading days from 2015 to 2020, there were 4 days in which GM was down more than -10%. This table shows the average price changes over the 4 days.

Average Type	Average Price Change
Days after:	1	4	7	10	13	16	19
Avg for Change ≥ -10%	4.8	-3.7	-6.5	-3.7	-3.9	1.8	6.2

Table 10. Periods when GM moved 5% or more

In this table, we track the price movements in the 20 days after GM had a one-day price change of at least 5%.

Date	Price Change	Price Change after 5% Move
Days after:		1	4	7	10	13	16	19
20200324	19.9%	1.8	1.0	-13.8	.9	14.0	2.6	6.0
20180531	12.8%	1.2	2.9	5.0	2.0	-1.0	-3.4	-5.5
20200310	9.8%	-4.1	-22.6	-34.7	-22.2	-21.2	-29.0	-27.9
20200518	9.6%	-.5	4.7	12.0	8.6	17.5	20.4	12.7
20181031	9%	-.3	-.4	-2.4	-3.7	-2.5	-2.8	.3
20200407	8.9%	8.6	8.0	-2.0	-.3	3.1	11.6	-2.6
20200408	8.5%	4.0	-.6	-2.8	-7.9	-2.9	-3.6	-8.1
20200406	8.3%	9.0	23.1	10.8	14.5	10.1	13.5	6.9
20200908	7.9%	-1.3	-3.7	-1.4	-9.1	-10.4	-8.6	-4.4
20200417	7.7%	-.4	-4.3	-1.3	-7.0	-2.6	1.4	-.8
20200817	7.7%	-.6	-4.8	-1.8	-1.3	-1.8	6.5	3.9
20200313	7.2%	-15.0	-28.3	-14.6	-13.5	-22.1	-20.9	-2.6
20200429	7.2%	-6.3	-10.6	.6	-9.8	4.3	8.5	15.2
20190111	7%	1.3	2.9	2.6	3.9	5.1	4.7	4.0
20201020	6.7%	.5	.6	-2.0	-.7	5.3	13.9	18.3
20200508	6.6%	-4.7	-6.8	3.2	8.6	16.1	12.6	21.9
20200824	6.1%	-2.0	-1.0	2.1	6.8	.5	4.9	-1.0
20190604	6%	.3	.8	.8	2.7	3.3	6.7	8.5
20200603	6%	.3	2.7	-3.8	-6.6	-9.3	-13.2	-13.0
20180206	5.8%	1.3	.3	-.0	-2.6	-2.3	-6.0	-9.8
20151021	5.7%	.0	-1.3	-1.4	.0	.7	-.9	-.6
20161110	5.7%	3.9	1.5	.9	3.5	5.6	8.2	10.9
20161201	5.5%	-2.8	-.4	1.8	-.5	.5	-2.0	-3.5
20170104	5.5%	-1.9	.7	.7	1.0	-1.2	1.2	-1.3
20200612	5.5%	-.7	-3.1	-6.1	-12.5	-10.7	-10.1	-12.8
20150204	5.4%	1.2	4.7	5.0	3.8	5.2	4.8	5.5
20200319	5.4%	2.4	21.3	20.4	2.7	20.3	35.9	22.3
20200526	5.4%	1.4	-1.7	6.4	9.0	2.0	-.9	-3.8
20201110	5.4%	-1.3	2.6	4.2	13.1	9.7	8.5	7.9
20201105	5.3%	.9	9.2	13.4	15.3	25.1	21.3	20.0
20150708	-5%	-.6	1.9	-1.7	-2.9	-.4	2.3	1.1
20181204	-5%	.0	-5.8	-3.9	-4.4	-9.7	-8.2	-8.4
20200421	-5%	.3	5.7	4.9	.1	12.7	1.0	16.8
20200327	-5.2%	-.3	-14.9	-.4	12.5	1.3	4.7	.7
20200402	-5.5%	-.8	27.2	26.5	14.7	16.8	20.7	30.7
20200910	-5.5%	1.0	5.4	-.6	-3.5	-4.7	1.0	4.8
20200415	-5.7%	-3.6	-1.9	1.3	9.8	-4.2	3.6	4.2
20150824	-6%	-1.9	4.3	5.1	3.9	7.9	11.5	9.7
20200709	-6%	4.1	14.8	11.1	14.3	12.4	6.3	12.4
20200430	-6.2%	-6.2	-1.8	2.3	.1	10.8	16.6	24.7
20200501	-6.2%	-.7	7.4	7.9	8.3	21.9	24.3	27.7
20200401	-7.3%	-5.6	10.6	24.9	12.5	16.2	11.7	15.2
20200611	-7.8%	5.5	2.5	-.5	-4.8	-4.5	-2.9	-11.6
20200312	-11.3%	7.2	-27.1	-23.6	-2.1	-9.8	-21.7	.4
20200309	-13.9%	9.8	.1	-32.0	-28.7	-8.6	-15.8	-26.9
20200316	-15%	-3.2	-13.6	2.3	1.5	-13.4	1.4	14.6
20200318	-17.3%	5.4	25.7	27.3	14.6	16.4	43.2	36.8

Table 10a. GM average price changes following a 5% up day

Of the 1,549 trading days from 2015 to 2020, there were 30 days in which GM was up more than 5%. This table shows the average price changes over the 30 days.

Average Type	Average Price Change
Days after:	1	4	7	10	13	16	19
Avg for Change ≥ 5%	-.1	-.1	.1	-.0	2.0	2.9	2.2

Table 10b. GM average price changes following a 5% down day

Of the 1,549 trading days from 2015 to 2020, there were 17 days in which GM was down more than -5%. This table shows the average price changes over the 17 days.

Average Type	Average Price Change
Days after:	1	4	7	10	13	16	19
Avg for Change ≥ -5%	.6	2.4	3.0	2.7	3.6	5.9	9.0

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Also see: VIX price movement study.