Optimism: a 4.0σ rise on 18 September 2026

Recorded 7 October 2026

On 18 September 2026 Optimism rose 19.60% close to close, 4.0 times its typical daily move of 4.90% over the 20 sessions before it: larger than every one of the 84 sessions on record before it. 30 other instruments of the 147 measured that day moved 2σ or more.

The day

Daily closes, as recorded the night after

Move: +19.60%
Size: +4.0σ
Typical day before it: 4.90%
Close: 0.120814
Previous close, 17 September 2026: 0.101019
Since, to 23 October 2026: −2.69%

Optimism, the 30 sessions to 18 September 2026

Daily closes; the last point is the quake

Show values

Optimism, the 30 sessions to 18 September 2026
Point	OP
19 Aug 2026	0.090
20 Aug 2026	0.098
21 Aug 2026	0.107
22 Aug 2026	0.109
23 Aug 2026	0.112
24 Aug 2026	0.108
25 Aug 2026	0.101
26 Aug 2026	0.099
27 Aug 2026	0.097
28 Aug 2026	0.090
29 Aug 2026	0.089
30 Aug 2026	0.086
31 Aug 2026	0.094
1 Sep 2026	0.095
2 Sep 2026	0.099
3 Sep 2026	0.101
4 Sep 2026	0.098
5 Sep 2026	0.108
6 Sep 2026	0.110
7 Sep 2026	0.111
8 Sep 2026	0.105
9 Sep 2026	0.100
10 Sep 2026	0.094
11 Sep 2026	0.095
12 Sep 2026	0.096
13 Sep 2026	0.095
14 Sep 2026	0.102
15 Sep 2026	0.094
16 Sep 2026	0.096
17 Sep 2026	0.101
18 Sep 2026	0.121

The same day

Other quakes on 18 September 2026

Instrument	Move	Size
Aptos APT	+22.53%	+5.4σ
Solana SOL	+10.82%	+3.9σ
Bitcoin BTC	+5.89%	+3.4σ
Immutable IMX	+8.61%	+3.3σ
Ethereum ETH	+6.71%	+3.2σ
Qualcomm QCOM	−5.82%	−3.1σ

Optimism's other quakes

On record, newest first

13 October 2026: +21.44%, +3.3σ
19 August 2026: +9.66%, +3.7σ
27 July 2026: −8.34%, −3.3σ
3 July 2026: +8.33%, +3.3σ

How it is measured

The move is the close-to-close return; its size is that return divided by the standard deviation of Optimism's previous 20 daily returns. A quake is 3σ or more. This record was made the night after the day finished trading and has not been changed since. The live chart is on Optimism's page; the last few months of every market's daily moves are on the volatility terrain, and every quake on record is in the quake archive.