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            <startDate>2026-03-06</startDate>
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    <ffd:OfferingNote contextRef="c1" id="ixv-99">&lt;table style="font-size: 12pt; border-spacing: 0px; border-collapse: collapse; width: 100%;"&gt; &lt;tr style="height: 0px; font-size: 0px;"&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 99%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="vertical-align: top;"&gt; &lt;td style="padding: 0px 0pt;"&gt; &lt;div style="margin-bottom: 4pt;"&gt; &lt;span style="font-size: 10.0pt;"&gt;(1)&lt;/span&gt; &lt;/div&gt; &lt;/td&gt; &lt;td style="padding: 0px 5.4pt; text-align: left;"&gt; &lt;div style="margin-bottom: 4pt;"&gt; &lt;span style="font-size: 10.0pt;"&gt;In accordance with Rule 416
under the Securities Act of 1933, as amended,
this registration statement shall be deemed to cover any additional securities
that may from time to time be offered or issued to prevent dilution resulting
from stock splits, stock dividends or similar transactions.&lt;/span&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt;&lt;table style="font-size: 12pt; border-spacing: 0px; border-collapse: collapse; width: 100%;"&gt;
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      &lt;span style="font-size: 10.0pt;"&gt;Consists of an additional 28,672,957 shares of common
stock issuable under the AtaiBeckley Inc. 2021
Incentive Award Plan (the &#x201c;2021 Plan&#x201d;) pursuant to the terms of the 2021
Plan.&lt;/span&gt;
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     &lt;div style="margin-bottom: 4pt;"&gt;
      &lt;span style="font-size: 10.0pt;"&gt;(3)&lt;/span&gt;
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     &lt;div style="margin-bottom: 4pt;"&gt;
      &lt;span style="font-size: 10.0pt;"&gt;Estimated solely for the purpose of calculating
the registration fee pursuant to Rules&#160;457(c)&#160;and 457(h)&#160;of the
Securities Act of 1933, as amended, and based upon the average of the high and
low prices of AtaiBeckley Inc.&#x2019;s (the &#x201c;Registrant&#x201d;) common stock as reported on
The Nasdaq Stock Exchange on March 5,
2026.&lt;/span&gt;
     &lt;/div&gt;
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    <dei:EntityCentralIndexKey contextRef="c0" id="ixv-166">0002081043</dei:EntityCentralIndexKey>
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