NPKI · IV Rank History

NPK International Inc.

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IV rank shows where NPKI'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.

NPKI's 30-day at-the-money implied volatility was 69.8% as of Oct 26, 2026. Its 52-week IV rank is 29 and its IV percentile is 82%: IV was lower on 82% of the past year's sessions. Over those 52 weeks it ranged from 33.0% (Jun 16, 2026) to 157.7% (Mar 2, 2026). On the 90-session window our screeners use, the IV rank is 54.

NPKI IV rank history

384 sessions

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

NPKI IV rank and implied volatility as of 2026-10-26

52-Week IV Rank

0 = year low, 100 = year high

IV Percentile

82%

of past-year sessions had lower IV

90-Session IV Rank

used by our screeners

30-Day ATM IV

69.8%

1-year average 59.2%

52-Week IV High

157.7%

2026-03-02

52-Week IV Low

33.0%

2026-06-16

History Since

2025-04-07

384 sessions

How these are measured. Implied volatility here is NPKI'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 NPKI 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.

NPKI implied volatility by month

Month	Avg ATM IV	High	Low	Avg IV Rank (90-session)
Oct 2026 (to date)	66.8%	78.5%	51.8%	54
Sep 2026	59.0%	82.3%	44.1%	42
Aug 2026	61.7%	88.2%	49.5%	46
Jul 2026	62.8%	83.1%	40.6%	39
Jun 2026	55.4%	95.1%	33.0%	16
May 2026	54.8%	91.7%	37.5%	15
Apr 2026	62.6%	80.1%	52.0%	23
Mar 2026	66.6%	157.7%	50.4%	27
Feb 2026	65.4%	98.0%	51.7%	56
Jan 2026	59.5%	88.7%	37.5%	46
Dec 2025	42.7%	62.2%	33.6%	16
Nov 2025	53.7%	71.0%	41.5%	34
Oct 2025	61.7%	89.8%	46.8%	39
Sep 2025	56.8%	70.9%	42.9%	30
Aug 2025	48.8%	85.5%	34.0%	12
Jul 2025	74.6%	91.6%	57.0%	34
Jun 2025	68.3%	105.3%	44.7%	27
May 2025	58.1%	94.8%	47.3%	6
Apr 2025	95.3%	133.2%	62.0%	—

NPKI IV rank: last 30 sessions

Date	IV Rank (90-session)	30-Day ATM IV	7-Day ATM IV
2026-10-26	54	69.8%	—
2026-10-23	56	68.0%	—
2026-10-22	37	55.7%	—
2026-10-21	73	78.5%	—
2026-10-20	52	65.4%	—
2026-10-19	52	65.6%	—
2026-10-16	61	70.8%	—
2026-10-15	61	70.6%	—
2026-10-14	54	66.4%	237.4%
2026-10-13	57	68.5%	135.8%
2026-10-12	65	73.4%	165.5%
2026-10-09	63	71.9%	133.3%
2026-10-08	56	67.5%	85.9%
2026-10-07	64	72.6%	116.6%
2026-10-06	40	57.6%	96.5%
2026-10-05	30	51.8%	63.7%
2026-10-02	48	63.0%	83.8%
2026-10-01	52	65.0%	76.8%
2026-09-30	52	65.3%	81.3%
2026-09-29	67	74.8%	79.4%
2026-09-28	33	53.5%	55.1%
2026-09-25	36	55.2%	49.0%
2026-09-24	36	55.5%	—
2026-09-23	27	50.1%	—
2026-09-22	79	82.3%	—
2026-09-21	50	64.0%	—
2026-09-18	18	44.1%	—
2026-09-17	21	46.3%	—
2026-09-16	18	44.5%	111.9%
2026-09-15	48	62.7%	124.9%