Product2026-08-097 min read

IV30 vs RV20: See Implied and Realized Volatility Side by Side

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TradingFlow Rank Symbols now compares IV30 with RV20 and RV30, adds a signed IV30−RV20 spread, and preserves the separate dates behind each measure.

#IV30 vs RV20 #realized volatility #implied volatility #RV20 #RV30 #volatility screener #Rank Symbols

IV30 vs RV20 is now a first-class comparison in TradingFlow Rank Symbols. The new volatility view places IV30, RV20, RV30, and the signed IV30−RV20 difference in the same table and symbol drawer, making it easier to see how forward-looking option prices compare with the volatility the underlying recently realized.

The important word is compare. A positive spread does not prove options are overpriced; a negative spread does not prove they are cheap. These measures look through different windows and answer different questions. TradingFlow keeps those boundaries—and the dates behind the data—visible.

Open TradingFlow Rank Symbols to follow the workflow described below.

What changed in Rank Symbols

The Rank Symbols table now exposes four sortable, filterable fields:

Metric	What it measures	Display
IV30	Forward-looking, 30-day at-the-money implied volatility	Annualized percentage
RV20	Realized volatility across the latest 20 valid completed sessions	Annualized percentage
RV30	Realized volatility across the latest 30 valid completed sessions	Annualized percentage
IV30−RV20	IV30 minus RV20	Signed volatility points

Annotated TradingFlow Rank Symbols table highlighting IV30, RV20 and RV30, and the signed IV30 minus RV20 column

The cross-symbol table now brings the comparison into the discovery surface: 1) IV30, 2) RV20 and RV30, and 3) the signed IV30−RV20 difference. Values move with each new market snapshot.

The dedicated Vol presentation brings the four measures forward and removes unrelated flow columns from the default view. Paid Rank users can apply that preset, use numeric range filters, sort the spread, and preserve the setup in saved views. The selected-symbol Vol drawer keeps the headline values available for a focused structure read.

How TradingFlow calculates the comparison

Diagram explaining the different clocks and formulas behind IV30, RV20, RV30, and IV30 minus RV20

IV30: the option market’s forward-looking input

IV30 is TradingFlow’s 30-day at-the-money implied-volatility measure. For qualifying expirations, TradingFlow uses two-sided ATM call and put implied volatility, then interpolates between expirations to a 30-day horizon.

That makes IV30 forward-looking in construction: it reflects option prices and the market’s pricing of future uncertainty. It is not a forecast that the underlying will move by that amount.

If you need a refresher on how implied volatility fits with delta, gamma, and other option sensitivities, see the Greeks and GEX tutorial. You can also review IV Rank for a different question: where current implied volatility sits relative to its own history.

RV20 and RV30: what the underlying actually realized

RV20 and RV30 use completed trading sessions rather than option prices. For each valid session, TradingFlow computes the log return:

returnₜ = ln(closeₜ / pre_closeₜ)

It then takes the sample standard deviation of the latest 20 or 30 valid returns and annualizes the result with √252.

The full window is required. If TradingFlow cannot assemble all 20 or 30 valid observations, it returns no value instead of silently shortening the lookback. The table renders that missing state as —. A separate vendor “historical volatility” field is not relabeled or substituted for these RV measures.

This strict contract matters. It means RV20 always means the same completed 20-session calculation and RV30 always means the same completed 30-session calculation.

IV30−RV20: a relationship, not a verdict

TradingFlow calculates the spread only when both IV30 and RV20 are present:

IV30−RV20 = IV30 − RV20

The result is displayed in volatility points, not as a percent change. If IV30 is 31.3% and RV20 is 25.4%, the result is +5.9 points.

Positive: IV30 is above trailing RV20.
Near zero: the two annualized measures are at similar levels.
Negative: IV30 is below trailing RV20.

None of those labels establishes fair value, mispricing, expected return, or trade direction. Earnings, event risk, skew, term structure, liquidity, and the mismatch between forward and trailing horizons can all explain the relationship.

A real symbol example: CANE

The screenshot below captures CANE from the Aug. 7, 2026 session in the current TradingFlow build:

Annotated CANE Vol drawer showing IV30, RV20, RV30, IV30 minus RV20, and the separate source dates

CANE example: 1) IV30 31.3% with its volatility snapshot date, 2) RV20 25.4% through Aug. 7, 3) RV30 24.0% through Aug. 7, and 4) a +5.9-point IV30−RV20 difference. This is a dated product example, not a recommendation.

Two details make the drawer more useful than an isolated spreadsheet column:

IV and RV provenance stay separate. IV30 shows its volatility snapshot date; RV20 and RV30 show the last completed session included in their windows.
RV20 and RV30 provide two trailing lenses. Here, RV20 is modestly above RV30, so the latest 20-session window realized slightly more annualized variation than the broader 30-session window. That is a historical description, not proof that volatility will continue rising.

To reproduce the workflow with live values, open CANE directly in the Vol drawer. The numbers and selected session will update as new snapshots arrive.

A practical IV vs RV research workflow

Four-step TradingFlow workflow from Rank Symbols through the Vol view and filters to the selected-symbol Vol drawer

1. Start with the cross-section

Open Rank Symbols and use the Vol presentation to bring IV30, RV20, RV30, and the spread together. Sort or filter a metric to find relationships worth inspecting.

Large positive or negative spreads are investigation candidates—not automatic entries. Extremely high IV can be justified by an upcoming event; unusually high RV can follow a one-off move that the option market does not expect to repeat.

2. Compare RV20 with RV30

The two realized-volatility windows add recency context:

RV20 above RV30 means the more recent 20-session window was more volatile on an annualized basis than the broader 30-session window.
RV20 below RV30 means the recent window was calmer than the broader one.

This comparison does not identify the cause. Open the underlying’s chart, recent news, earnings calendar, and options structure before forming a thesis.

3. Open the Vol drawer and verify the clocks

Select a symbol, open Vol, and confirm the IV snapshot date and RV through-date. If either input is unavailable, TradingFlow shows — rather than inventing a comparison.

The drawer also keeps IV Rank, IV Percentile, skew, and term context nearby. Those fields answer different questions; they should support the read rather than be collapsed into one score.

4. Turn the comparison into a better question

Useful follow-up questions include:

Is the spread concentrated around a known earnings or macro event?
Does the term structure show that the premium is isolated to one expiration?
Is skew assigning more price to downside or upside protection?
Is RV20 diverging materially from RV30 because of a recent gap or sustained movement?
Is there enough options liquidity to treat the displayed IV as actionable context?

This is where a volatility screener creates value: it reduces a large market into a manageable research list while keeping the evidence inspectable.

What this feature deliberately does not claim

TradingFlow does not treat IV30−RV20 as:

an options “cheap/expensive” verdict;
a probability that volatility will rise or fall;
a dealer-position or investor-intention signal;
a substitute for event, liquidity, skew, or term-structure analysis;
a recommendation to buy or sell volatility.

The feature is a descriptive comparison between a forward option-market measure and trailing underlying-price measures. That narrower definition makes the output more reusable—and more honest.

Start comparing implied and realized volatility

The addition of RV20, RV30, and IV30−RV20 turns Rank Symbols into a more complete volatility discovery surface. You can scan the market, preserve a view, inspect one symbol, verify each clock, and then move into deeper options research without leaving the same workflow.

Open TradingFlow App Home or go directly to Rank Symbols to compare live IV30 and RV data.

Educational market-data analysis only; not investment advice. Volatility values and availability change with source data and market snapshots.

TradingFlow Rank Symbols 现已将 IV30 vs RV20 变成一项可直接排序、筛选和检视的波动率对比。新的 Vol 视图把 IV30、RV20、RV30 与带正负号的 IV30−RV20 放进同一张表格和单标的抽屉，让你同时观察期权市场对未来不确定性的定价，以及标的近期真正实现了多少波动。

这里最重要的词是“对比”。正差值不等于期权高估，负差值也不等于期权便宜。两类指标使用不同时间窗口、回答不同问题；TradingFlow 会明确显示这项边界，以及数据背后的日期。

你可以打开 TradingFlow Rank Symbols，按下文流程复现。

Rank Symbols 更新了什么？

Rank Symbols 表格新增四个可排序、可筛选字段：

指标	衡量什么	展示方式
IV30	前瞻 30 天 ATM 隐含波动率	年化百分比
RV20	最近 20 个有效完整交易日的已实现波动率	年化百分比
RV30	最近 30 个有效完整交易日的已实现波动率	年化百分比
IV30−RV20	IV30 减去 RV20	带正负号的波动率点

带标注的 TradingFlow Rank Symbols 表格，突出 IV30、RV20、RV30 与 IV30 减 RV20 字段

全市场发现表把四项指标放到一起：1）IV30；2）RV20 与 RV30；3）带正负号的 IV30−RV20 差值。新快照生成后，数值也会变化。

专门的 Vol 预设会把四个指标移到视线中心，并隐藏与当前任务无关的资金流字段。付费 Rank 用户可以应用该预设、使用数值范围筛选、按差值排序，并将设置保存为视图。打开任一标的后，Vol 抽屉会提供聚焦的单标的结构读数。

TradingFlow 如何计算 IV 与 RV？

说明 IV30、RV20、RV30 与 IV30 减 RV20 的不同时间窗口和计算方法

IV30：期权市场的前瞻输入

IV30 是 TradingFlow 的 30 天 ATM 隐含波动率指标。对于符合条件的到期日，TradingFlow 使用具有双边报价的 ATM Call 与 Put 隐含波动率，再在到期日之间插值到 30 天期限。

因此，IV30 在构造上是前瞻指标：它反映期权价格与市场对未来不确定性的定价。它不是“标的一定会波动这么多”的预测。

如果你希望先理解隐含波动率如何与 Delta、Gamma 等敏感度一起使用，可以阅读期权 Greeks 与 GEX 教程。IV Rank则回答另一个问题：当前隐含波动率在自身历史范围内处于什么位置。

RV20 与 RV30：标的近期实际走出了多少波动

RV20 与 RV30 不使用期权价格，而是使用已经完成的交易日。对于每个有效交易日，TradingFlow 先计算对数收益率：

returnₜ = ln(closeₜ / pre_closeₜ)

随后，系统对最近 20 或 30 个有效收益率计算样本标准差，再乘以 √252 年化。

计算必须具备完整窗口。如果无法取得全部 20 或 30 个有效观测值，TradingFlow 会返回空值，而不会偷偷缩短回溯期；表格会把该状态展示为 —。系统也不会把供应商的其他 “historical volatility” 字段改名后冒充 RV20 或 RV30。

严格的计算契约保证了：RV20 始终代表相同的完整 20 日计算，RV30 始终代表相同的完整 30 日计算。

IV30−RV20：相对关系，不是交易结论

只有当 IV30 与 RV20 同时存在时，TradingFlow 才会计算：

IV30−RV20 = IV30 − RV20

结果使用波动率点，而不是百分比变化。比如 IV30 为 31.3%、RV20 为 25.4%，差值就是 +5.9 点。

正数： IV30 高于过去 20 个交易日的 RV。
接近零： 两项年化指标处于相近水平。
负数： IV30 低于过去 20 个交易日的 RV。

这些状态都不能直接证明公允价值、高估/低估、预期收益或交易方向。财报与事件风险、偏斜、期限结构、流动性，以及前瞻与回溯窗口的差异，都可能解释这项关系。

真实案例：CANE

下图来自 TradingFlow 当前版本中的 CANE，数据交易日为 2026 年 8 月 7 日：

带标注的 CANE Vol 抽屉，展示 IV30、RV20、RV30、IV30 减 RV20 以及各自日期

CANE 示例：1）IV30 为 31.3%，并显示波动率快照日期；2）RV20 为 25.4%，截至 8 月 7 日；3）RV30 为 24.0%，截至 8 月 7 日；4）IV30−RV20 为 +5.9 点。这是一项带日期的产品示例，不是投资建议。

与孤立的表格字段相比，这个抽屉多提供了两层关键语境：

IV 与 RV 的来源日期分别保留。 IV30 显示波动率快照日期；RV20 与 RV30 显示各自窗口最后纳入的完整交易日。
RV20 与 RV30 提供两种回溯视角。 这个例子中 RV20 略高于 RV30，说明最近 20 日窗口的年化已实现波动略高于较宽的 30 日窗口。这只是历史描述，不代表波动率会继续上升。

你可以直接打开 CANE 的 Vol 抽屉复现同一操作。随着新快照到来，数值与所选交易日会更新。

一套实用的 IV vs RV 研究流程

从 Rank Symbols、Vol 视图和筛选器到单标的 Vol 抽屉的四步 TradingFlow 工作流

1. 从全市场截面开始

打开 Rank Symbols，应用 Vol 预设，将 IV30、RV20、RV30 与差值放到同一视图。对指标排序或设置范围，找出值得进一步研究的关系。

较大的正差值或负差值只能生成待研究名单，不能自动生成入场点。非常高的 IV 可能来自即将发生的事件；非常高的 RV 也可能来自期权市场认为不会重复的一次性跳空。

2. 对比 RV20 与 RV30

两个已实现波动率窗口提供“近期程度”的语境：

RV20 高于 RV30： 最近 20 日窗口的年化波动高于较宽的 30 日窗口。
RV20 低于 RV30： 最近窗口比 30 日窗口更平静。

该对比不能解释原因。形成观点之前，还需要查看标的价格、近期新闻、财报日期与期权结构。

3. 打开 Vol 抽屉，核对两套时钟

选择标的后打开 Vol，分别确认 IV 快照日期与 RV 截止日期。如果任一输入不可用，TradingFlow 会展示 —，而不是编造差值。

抽屉还会保留 IV Rank、IV Percentile、偏斜与期限语境。它们回答不同问题，应当共同支持研究，而不是被压缩成一个神奇分数。

4. 把差值转化成更好的问题

后续可以继续问：

差值是否集中在已知财报或宏观事件附近？
期限结构是否显示溢价只集中在某个到期日？
偏斜是否给下行保护或上行弹性分配了更多价格？
RV20 与 RV30 的明显分叉来自近期跳空，还是持续的价格波动？
期权流动性是否足以让显示的 IV 具备可操作的参考价值？

这才是波动率筛选器的价值：把整个市场压缩成可管理的研究清单，同时保留可检查的证据。

这项功能明确不声称什么

TradingFlow 不会把 IV30−RV20 当作：

期权“便宜/昂贵”的自动结论；
波动率未来上升或下降的概率；
做市商持仓或投资者意图信号；
对事件、流动性、偏斜与期限结构分析的替代品；
买入或卖出波动率的建议。

这项功能只描述“前瞻期权市场指标”与“回溯标的价格指标”之间的关系。更窄、更透明的定义，反而让结果更可靠、更容易复用。

开始对比隐含波动率与已实现波动率

RV20、RV30 与 IV30−RV20 的加入，让 Rank Symbols 成为更完整的波动率发现界面。你可以扫描全市场、保存视图、打开单一标的、核对每项数据的日期，再进入更深入的期权研究，而不必离开同一套工作流。

打开 TradingFlow App Home，或直接进入 Rank Symbols，开始比较最新 IV30 与 RV 数据。

本文仅用于市场数据教育与产品演示，不构成投资建议。波动率数值与可用性会随数据源和市场快照变化。

Tags#IV30 vs RV20 #realized volatility #implied volatility #RV20 #RV30 #volatility screener #Rank Symbols

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