diff --git a/.changeset/shy-panthers-hide.md b/.changeset/shy-panthers-hide.md
new file mode 100644
index 0000000000..602940db2a
--- /dev/null
+++ b/.changeset/shy-panthers-hide.md
@@ -0,0 +1,6 @@
+---
+"@navikt/ds-react": minor
+"@navikt/ds-css": minor
+---
+
+ReadMore: Added size 'large'.
diff --git a/@navikt/core/css/darkside/read-more.darkside.css b/@navikt/core/css/darkside/read-more.darkside.css
index 21228d8494..7d49bc9b87 100644
--- a/@navikt/core/css/darkside/read-more.darkside.css
+++ b/@navikt/core/css/darkside/read-more.darkside.css
@@ -1,3 +1,11 @@
+.navds-read-more {
+  --__axc-read-more-icon-size: 1.5rem;
+  --__axc-read-more-pi-start: 0px;
+  --__axc-read-more-pi-end: var(--ax-spacing-1);
+  --__axc-read-more-pb: var(--ax-spacing-1);
+}
+
+/* ----------------------------- ReadMore Button ---------------------------- */
 .navds-read-more__button {
   cursor: pointer;
   margin: 0;
@@ -5,87 +13,90 @@
   background: none;
   display: flex;
   align-items: flex-start;
-  gap: var(--a-spacing-05);
-  color: var(--ac-read-more-text, var(--a-text-action));
-  border-radius: var(--a-border-radius-small);
-  padding: var(--a-spacing-1) var(--a-spacing-2) var(--a-spacing-1) var(--a-spacing-05);
+  gap: var(--ax-spacing-1);
+  color: var(--ax-text-accent);
+  padding-inline: var(--__axc-read-more-pi-start) var(--__axc-read-more-pi-end);
+  padding-block: var(--__axc-read-more-pb);
   text-align: start;
-}
-
-.navds-read-more--small .navds-read-more__button {
-  padding: var(--a-spacing-05) var(--a-spacing-1-alt) var(--a-spacing-05) var(--a-spacing-05);
-}
 
-@media (forced-colors: active) {
-  .navds-read-more__button {
-    background-color: ButtonFace;
-    border: solid 1px ButtonText;
-    color: ButtonText;
+  &:focus-visible {
+    outline: 2px solid var(--ax-border-focus);
+    outline-offset: 2px;
   }
 
-  .navds-read-more__button.navds-read-more__button:focus-visible {
-    box-shadow: none;
-    outline: 2px solid highlight;
-    outline-offset: 2px;
+  &[data-state="open"] .navds-read-more__expand-icon {
+    transform: rotateX(-180deg);
   }
 }
 
-.navds-read-more__button:hover {
-  background-color: var(--ac-read-more-hover-bg, var(--a-surface-hover));
-  color: var(--ac-read-more-hover-text, var(--a-text-action-hover));
-}
+.navds-read-more:is([data-volume="low"], :not([data-volume])) {
+  & .navds-read-more__button {
+    border-radius: var(--ax-border-radius-medium);
 
-.navds-read-more__button:active {
-  background-color: var(--ac-read-more-active-bg, var(--a-surface-active));
+    &:hover {
+      background-color: var(--ax-bg-neutral-hoverA);
+      color: var(--ax-text-accent-strong);
+    }
+  }
 }
 
-.navds-read-more__button:focus-visible {
-  outline: none;
-  box-shadow: var(--a-shadow-focus);
-}
+.navds-read-more[data-volume="high"] {
+  & .navds-read-more__button {
+    background-color: var(--ax-bg-accent-moderate);
+    border-radius: var(--ax-border-radius-full);
 
-@supports not selector(:focus-visible) {
-  .navds-read-more__button:focus {
-    outline: none;
-    box-shadow: var(--a-shadow-focus);
+    &:hover {
+      background-color: var(--ax-bg-accent-moderate-hoverA);
+      color: var(--ax-text-accent-strong);
+    }
   }
-}
 
-.navds-read-more__content {
-  margin-top: var(--a-spacing-1);
-  border-left: 2px solid var(--ac-read-more-line, var(--a-border-divider));
-  margin-left: 0.8125rem;
-  padding-left: 0.8125rem;
-  color: var(--a-text-default);
-}
+  &.navds-read-more--large {
+    --__axc-read-more-pi-start: var(--ax-spacing-3);
+    --__axc-read-more-pi-end: var(--ax-spacing-6);
+  }
 
-.navds-read-more--small .navds-read-more__content {
-  margin-left: 0.6875rem;
-  padding-left: 0.6875rem;
+  &.navds-read-more--small,
+  &.navds-read-more--medium {
+    --__axc-read-more-pi-start: var(--ax-spacing-2);
+    --__axc-read-more-pi-end: var(--ax-spacing-4);
+  }
 }
 
-.navds-read-more__content--closed {
-  display: none;
+/* ---------------------------- ReadMore Content ---------------------------- */
+.navds-read-more__content {
+  margin-top: var(--ax-spacing-2);
+  border-left: 2px solid var(--ax-border-neutral-subtleA);
+  color: var(--ax-text-default);
+  margin-left: calc(var(--__axc-read-more-pi-start) + var(--__axc-read-more-icon-size) / 2 - 1px);
+  padding-left: calc(var(--__axc-read-more-icon-size) / 2 - 1px + var(--ax-spacing-1));
+
+  &[data-state="closed"] {
+    display: none;
+  }
 }
 
 .navds-read-more__expand-icon {
-  font-size: 1.5rem;
+  font-size: var(--__axc-read-more-icon-size);
   flex-shrink: 0;
+  transition: transform 100ms cubic-bezier(0.2, 0, 0, 1);
 }
 
-.navds-read-more--small .navds-read-more__expand-icon {
-  font-size: 1.25rem;
+/* ----------------------------- ReadMore Sizes ----------------------------- */
+.navds-read-more--large {
+  --__axc-read-more-pb: var(--ax-spacing-3);
 }
 
-.navds-read-more__button:hover > .navds-read-more__expand-icon {
-  position: relative;
-  top: 1px;
+.navds-read-more--small {
+  --__axc-read-more-icon-size: 1.25rem;
+  --__axc-read-more-pb: var(--ax-spacing-05);
 }
 
-.navds-read-more--open > .navds-read-more__button > .navds-read-more__expand-icon {
-  transform: rotate(-180deg);
-}
-
-.navds-read-more--open > .navds-read-more__button:hover > .navds-read-more__expand-icon {
-  top: -1px;
+/* ------------------------- ReadMore high-contrast ------------------------- */
+@media (forced-colors: active) {
+  .navds-read-more__button {
+    background-color: ButtonFace;
+    border: solid 1px ButtonText;
+    color: ButtonText;
+  }
 }
diff --git a/@navikt/core/css/read-more.css b/@navikt/core/css/read-more.css
index 21228d8494..2d10b572e3 100644
--- a/@navikt/core/css/read-more.css
+++ b/@navikt/core/css/read-more.css
@@ -16,6 +16,10 @@
   padding: var(--a-spacing-05) var(--a-spacing-1-alt) var(--a-spacing-05) var(--a-spacing-05);
 }
 
+.navds-read-more--large .navds-read-more__button {
+  padding: var(--a-spacing-3) var(--a-spacing-1-alt) var(--a-spacing-3) var(--a-spacing-05);
+}
+
 @media (forced-colors: active) {
   .navds-read-more__button {
     background-color: ButtonFace;
diff --git a/@navikt/core/react/src/provider/theme/AkselTheme.tsx b/@navikt/core/react/src/provider/theme/AkselTheme.tsx
index 636f90f04d..b620841a46 100644
--- a/@navikt/core/react/src/provider/theme/AkselTheme.tsx
+++ b/@navikt/core/react/src/provider/theme/AkselTheme.tsx
@@ -4,7 +4,17 @@ import { Slot } from "../../slot/Slot";
 import { createContext } from "../../util/create-context";
 
 type AkselThemeContext = {
-  theme: "light" | "dark";
+  /**
+   * Color theme
+   * @default "light"
+   */
+  theme?: "light" | "dark";
+  /**
+   * Brand volume
+   * @default "low"
+   * This is experimental and subject to changes
+   */
+  volume?: "high" | "low";
 };
 
 const [ThemeProvider, useAkselTheme] = createContext<AkselThemeContext>({
@@ -31,6 +41,7 @@ const AkselTheme = forwardRef<HTMLDivElement, AkselThemeProps>(
       className,
       asChild = false,
       theme = context?.theme ?? "light",
+      volume = context?.volume ?? "low",
       hasBackground: hasBackgroundProp = true,
     } = props;
 
@@ -42,11 +53,12 @@ const AkselTheme = forwardRef<HTMLDivElement, AkselThemeProps>(
     const SlotElement = asChild ? Slot : "div";
 
     return (
-      <ThemeProvider theme={theme}>
+      <ThemeProvider theme={theme} volume={volume}>
         <SlotElement
           ref={ref}
           className={cl("navds-theme", className, theme)}
           data-background={hasBackground}
+          data-volume={volume}
         >
           {children}
         </SlotElement>
diff --git a/@navikt/core/react/src/read-more/ReadMore.tsx b/@navikt/core/react/src/read-more/ReadMore.tsx
index 6c6cd7cac8..61183f7252 100644
--- a/@navikt/core/react/src/read-more/ReadMore.tsx
+++ b/@navikt/core/react/src/read-more/ReadMore.tsx
@@ -1,6 +1,7 @@
 import cl from "clsx";
 import React, { forwardRef } from "react";
 import { ChevronDownIcon } from "@navikt/aksel-icons";
+import { UNSAFE_useAkselTheme } from "../provider";
 import { BodyLong } from "../typography";
 import { composeEventHandlers } from "../util/composeEventHandlers";
 import { useControllableState } from "../util/hooks/useControllableState";
@@ -33,7 +34,7 @@ export interface ReadMoreProps
    * Changes fontsize for content.
    * @default "medium"
    */
-  size?: "medium" | "small";
+  size?: "large" | "medium" | "small";
 }
 
 /**
@@ -74,6 +75,10 @@ export const ReadMore = forwardRef<HTMLButtonElement, ReadMoreProps>(
       onChange: onOpenChange,
     });
 
+    const themeContext = UNSAFE_useAkselTheme(false);
+
+    const typoSize = size === "small" ? "small" : "medium";
+
     return (
       <div
         className={cl(
@@ -82,6 +87,7 @@ export const ReadMore = forwardRef<HTMLButtonElement, ReadMoreProps>(
           className,
           { "navds-read-more--open": _open },
         )}
+        data-volume={themeContext?.volume}
       >
         <button
           {...rest}
@@ -92,6 +98,7 @@ export const ReadMore = forwardRef<HTMLButtonElement, ReadMoreProps>(
           })}
           onClick={composeEventHandlers(onClick, () => _setOpen((x) => !x))}
           aria-expanded={_open}
+          data-state={_open ? "open" : "closed"}
         >
           <ChevronDownIcon
             className="navds-read-more__expand-icon"
@@ -106,7 +113,8 @@ export const ReadMore = forwardRef<HTMLButtonElement, ReadMoreProps>(
           className={cl("navds-read-more__content", {
             "navds-read-more__content--closed": !_open,
           })}
-          size={size}
+          size={typoSize}
+          data-state={_open ? "open" : "closed"}
         >
           {children}
         </BodyLong>
diff --git a/@navikt/core/react/src/read-more/readmore.stories.tsx b/@navikt/core/react/src/read-more/readmore.stories.tsx
index 5434cdaaf9..4a543e9b64 100644
--- a/@navikt/core/react/src/read-more/readmore.stories.tsx
+++ b/@navikt/core/react/src/read-more/readmore.stories.tsx
@@ -3,6 +3,7 @@ import { fn } from "@storybook/test";
 import React from "react";
 import { ReadMore } from ".";
 import { VStack } from "../layout/stack";
+import { UNSAFE_AkselTheme } from "../provider";
 
 export default {
   title: "ds-react/ReadMore",
@@ -37,6 +38,13 @@ export const Default: Story = {
   },
 };
 
+export const Large: Story = {
+  args: {
+    ...Default.args,
+    size: "large",
+  },
+};
+
 export const Small: Story = {
   args: {
     ...Default.args,
@@ -58,8 +66,44 @@ export const Open: Story = {
   },
 };
 
+export const BrandVolumeLow: Story = {
+  render: () => (
+    <UNSAFE_AkselTheme volume="low">
+      <VStack gap="4">
+        <ReadMore size="large" header={Default.args?.header}>
+          {Content}
+        </ReadMore>
+        <ReadMore header={Default.args?.header}>{Content}</ReadMore>
+        <ReadMore size="small" header={Default.args?.header}>
+          {Content}
+        </ReadMore>
+      </VStack>
+    </UNSAFE_AkselTheme>
+  ),
+  args: {
+    ...Default.args,
+    open: true,
+  },
+};
+
+export const BrandVolumeHigh: Story = {
+  render: () => (
+    <UNSAFE_AkselTheme volume="high">
+      <VStack gap="4">
+        <ReadMore size="large" header={Default.args?.header}>
+          {Content}
+        </ReadMore>
+        <ReadMore header={Default.args?.header}>{Content}</ReadMore>
+        <ReadMore size="small" header={Default.args?.header}>
+          {Content}
+        </ReadMore>
+      </VStack>
+    </UNSAFE_AkselTheme>
+  ),
+};
+
 export const Chromatic: Story = {
-  render: () => {
+  render: (...props) => {
     return (
       <VStack gap="4">
         <div>
@@ -72,6 +116,11 @@ export const Chromatic: Story = {
           {/* @ts-expect-error Args are partial, leading to required prop mismatch */}
           <ReadMore {...Small.args} />
         </div>
+        <div>
+          <h2>Large</h2>
+          {/* @ts-expect-error Args are partial, leading to required prop mismatch */}
+          <ReadMore {...Large.args} />
+        </div>
         <div>
           <h2>DefaultOpen</h2>
           {/* @ts-expect-error Args are partial, leading to required prop mismatch */}
@@ -82,6 +131,14 @@ export const Chromatic: Story = {
           {/* @ts-expect-error Args are partial, leading to required prop mismatch */}
           <ReadMore {...Open.args} />
         </div>
+        <div>
+          <h2>BrandVolumeLow</h2>
+          {BrandVolumeLow?.render?.(...props)}
+        </div>
+        <div>
+          <h2>BrandVolumeHigh</h2>
+          {BrandVolumeHigh?.render?.(...props)}
+        </div>
       </VStack>
     );
   },