SOBO · IV Rank History

South Bow Corporation

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IV rank shows where SOBO's implied volatility sits within its own recent range: 0 is the lowest reading in the window, 100 the highest. This page gives the 52-week version, the 90-session version our screeners use, the IV percentile, and the daily history.

SOBO's 30-day at-the-money implied volatility was 34.0% as of Oct 21, 2026. Its 52-week IV rank is 29 and its IV percentile is 57%: IV was lower on 57% of the past year's sessions. Over those 52 weeks it ranged from 23.8% (Aug 20, 2026) to 59.2% (Oct 2, 2025). On the 90-session window our screeners use, the IV rank is 41.

SOBO IV rank history

330 sessions

Filled line: 90-session IV rank (0–100, left axis). Dashed line: 30-day at-the-money implied volatility (right axis).

SOBO IV rank and implied volatility as of 2026-10-21

52-Week IV Rank

0 = year low, 100 = year high

IV Percentile

57%

of past-year sessions had lower IV

90-Session IV Rank

used by our screeners

30-Day ATM IV

34.0%

1-year average 34.5%

52-Week IV High

59.2%

2025-10-02

52-Week IV Low

23.8%

2026-08-20

History Since

2025-04-07

330 sessions

How these are measured. Implied volatility here is SOBO's 30-day at-the-money IV: the implied volatility of the calls and puts struck nearest the share price, blended between the expirations on either side of 30 days so every reading covers the same horizon. It's the IV level options traders usually quote, and it doesn't jump when the nearest expiration rolls from a weekly to a monthly. The 7-day figure is the same measure a week out, so it reacts first to near-term events such as earnings.

52-week IV rank = (today's IV − 52-week low) ÷ (52-week high − 52-week low) × 100. IV percentile is the share of the past year's sessions that closed with lower IV than today. The 90-session IV rank applies the same rank formula to the last 90 sessions, so it reacts faster.

A high reading means SOBO options are expensive relative to their own recent history, which is common ahead of earnings or after a sharp move. It says nothing about which way the stock will go. The Vol Arb Screener ranks every tracked symbol by these measures.

SOBO implied volatility by month

Month	Avg ATM IV	High	Low	Avg IV Rank (90-session)
Oct 2026 (to date)	35.5%	48.9%	26.5%	46
Sep 2026	37.7%	48.6%	28.5%	79
Aug 2026	30.6%	35.2%	23.8%	32
Jul 2026	30.1%	36.5%	26.6%	27
Jun 2026	30.9%	36.4%	26.7%	30
May 2026	29.6%	35.1%	25.9%	21
Apr 2026	32.9%	42.3%	28.2%	34
Mar 2026	32.6%	44.1%	25.0%	25
Feb 2026	32.9%	45.0%	26.3%	20
Jan 2026	33.9%	44.1%	26.2%	23
Dec 2025	37.2%	47.5%	30.3%	34
Nov 2025	39.3%	49.7%	29.3%	45
Oct 2025	41.5%	59.2%	26.5%	51
Sep 2025	42.0%	57.1%	29.2%	53
Aug 2025	35.1%	44.5%	26.4%	17
Jul 2025	33.2%	37.8%	28.7%	14
Jun 2025	35.2%	53.1%	23.0%	14
May 2025	35.0%	53.3%	26.3%	8
Apr 2025	47.8%	93.7%	37.0%	—

SOBO IV rank: last 30 sessions

Date	IV Rank (90-session)	30-Day ATM IV	7-Day ATM IV
2026-10-21	41	34.0%	—
2026-10-20	19	28.5%	—
2026-10-19	20	28.8%	—
2026-10-16	41	34.1%	—
2026-10-15	27	30.7%	—
2026-10-14	11	26.5%	185.5%
2026-10-13	19	28.7%	155.5%
2026-10-09	19	28.7%	—
2026-10-08	67	40.8%	96.3%
2026-10-07	92	47.0%	94.4%
2026-10-06	57	38.3%	82.4%
2026-10-05	59	38.7%	65.6%
2026-10-02	75	42.7%	74.6%
2026-10-01	100	48.9%	80.0%
2026-09-30	80	43.6%	63.1%
2026-09-29	100	48.6%	72.5%
2026-09-28	94	43.4%	59.9%
2026-09-25	100	44.7%	55.5%
2026-09-24	98	44.3%	—
2026-09-23	100	44.7%	—
2026-09-22	100	40.7%	—
2026-09-21	94	39.6%	—
2026-09-18	100	40.6%	—
2026-09-17	100	39.7%	—
2026-09-16	81	35.3%	45.0%
2026-09-15	100	37.9%	75.8%
2026-09-14	88	35.4%	57.5%
2026-09-11	86	35.2%	32.5%
2026-09-10	70	33.1%	26.5%
2026-09-09	87	35.3%	42.6%