0000773757
2025-08-31
2025-08-31
0000773757
cfsti:S000036206Member
2025-08-31
2025-08-31
false
2025-08-31
497
0000773757
N-1A
<div style="line-height:10.0pt;text-align:center;"><span style="color:#003c78;font-family:arial;font-size:10pt;font-weight:bold">Supplement dated June 24, 2026</span></div><div style="margin-top:4pt;"><span style="color:#003c78;font-family:arial;font-size:10pt">to the Prospectus and Summary Prospectus of the following fund (the Fund):</span><span style="color:#003c78;float:left;font-family:arial;font-size:1pt;line-height:1pt"> </span></div>
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<td style="background-color:#003C78;border-bottom:2pt solid #FFFFFF;padding-bottom:3pt;padding-top:3pt;vertical-align:Bottom;width:339.64pt;"> <div style="line-height:10pt;text-align:left;"> <div style="margin-left:6pt;margin-right:6pt;margin-top:1pt;text-align:left;white-space:nowrap;"><span style="color:#ffffff;font-family:arial;font-size:8pt;font-weight:bold;margin-left:0.0pt">Fund</span></div> </div> </td>
<td style="background-color:#003C78;border-bottom:2pt solid #FFFFFF;padding-bottom:3pt;padding-top:3pt;vertical-align:Bottom;width:176.36pt;"> <div style="line-height:10pt;text-align:left;"> <div style="margin-left:6pt;margin-right:12pt;margin-top:1pt;text-align:center;white-space:nowrap;"><span style="color:#ffffff;font-family:arial;font-size:8pt;font-weight:bold">Prospectus and Summary Prospectus Dated</span></div> </div> </td> </tr>
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<td style="background-color:#D9E5F1;border-bottom:2pt solid #FFFFFF;padding-bottom:3pt;padding-top:3pt;vertical-align:Bottom;width:339.64pt;"> <div style="line-height:10pt;text-align:left;"> <div style="margin-left:6pt;margin-right:6pt;text-align:left;white-space:nowrap;"><span style="color:#003c78;font-family:arial;font-size:8pt;margin-left:0.0pt">Columbia Funds Series Trust I</span></div> </div> </td>
<td style="background-color:#D9E5F1;border-bottom:2pt solid #FFFFFF;padding-bottom:3pt;padding-top:3pt;vertical-align:Bottom;width:176.36pt;"> <div style="line-height:0.5pt;text-align:left;"> <div style="margin-left:6pt;margin-right:12pt;text-align:center;white-space:nowrap;"><span style="color:#003c78;font-family:arial;font-size:8pt;margin-left:-85.18pt"> </span></div> </div> </td> </tr>
<tr style="height:11pt">
<td style="background-color:#D9E5F1;padding-bottom:2pt;padding-top:3pt;vertical-align:Bottom;width:339.64pt;"> <div style="line-height:9pt;text-align:left;"> <div style="margin-left:6pt;margin-right:6pt;text-align:left;white-space:nowrap;"><span style="color:#003c78;font-family:arial;font-size:8pt;margin-left:0.0pt"> Multi-Manager Small Cap Equity Strategies Fund</span></div> </div> </td>
<td style="background-color:#D9E5F1;padding-bottom:2pt;padding-top:3pt;vertical-align:Bottom;width:176.36pt;"> <div style="line-height:9pt;text-align:left;"> <div style="margin-left:6pt;margin-right:12pt;text-align:center;white-space:nowrap;"><span style="color:#003c78;font-family:arial;font-size:8pt;margin-left:0.00pt">1/1/2026</span></div> </div> </td> </tr> </table><div style="margin-top:12pt;"><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">On June 18, 2026, the Fund's Board of Trustees approved certain changes to the Fund's subadvisers and principal </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">investment strategies effective on or about August 21, 2026 (the Effective Date). As a result, from the Effective </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">Date, </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">Conestoga Capital Advisors, LLC (Conestoga)</span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic"> no longer serves as a subadviser to the Fund. Accordingly, as of </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">the Effective Date, the changes described in this Supplement are hereby made to the Fund’s Prospectus and Summary </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">Prospectus.</span></div><div style="margin-top:12pt;"><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">The information under </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">the heading “Principal Investment Strategies” in the Summary Prospectus and in both </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">the </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">“</span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">Summary of the Fund” and </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">“More Information About the Fund</span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">” </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">sections of the Prospectus between the fifth and </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">last paragraph is hereby superseded and replaced with the following:</span></div><div style="margin-top:4pt;"><span style="color:#003c78;font-family:arial;font-size:10pt">The Fund may also invest in exchange-traded funds (ETFs), including pending the engagement of one or more </span><span style="color:#003c78;font-family:arial;font-size:10pt">additional subadvisers.</span></div><div style="margin-top:4pt;"><span style="color:#003c78;font-family:arial;font-size:10pt">Columbia Management is responsible for providing day-to-day portfolio management of one sleeve of the Fund and </span><span style="color:#003c78;font-family:arial;font-size:10pt">is also responsible for oversight of the Subadvisers. The Fund’s Subadvisers are Hotchkis and Wiley Capital </span><span style="color:#003c78;font-family:arial;font-size:10pt">Management, LLC (Hotchkis & Wiley), J.P. Morgan Investment Management Inc. (JPMIM) and Jacobs Levy Equity </span><span style="color:#003c78;font-family:arial;font-size:10pt">Management, Inc. (Jacobs Levy). Columbia Management and the Subadvisers act independently of each other and </span><span style="color:#003c78;font-family:arial;font-size:10pt">use their own methodologies for selecting investments. Columbia Management, subject to the oversight of the </span><span style="color:#003c78;font-family:arial;font-size:10pt">Fund’s Board of Trustees, determines the allocation of the Fund’s assets to each sleeve and may change these </span><span style="color:#003c78;font-family:arial;font-size:10pt">allocations at any time.</span></div>
<div style="line-height:10.0pt;text-align:center;"><span style="color:#003c78;font-family:arial;font-size:10pt;font-weight:bold">Supplement dated June 24, 2026</span></div><div style="margin-top:4pt;"><span style="color:#003c78;font-family:arial;font-size:10pt">to the Prospectus and Summary Prospectus of the following fund (the Fund):</span><span style="color:#003c78;float:left;font-family:arial;font-size:1pt;line-height:1pt"> </span></div>
<table cellpadding="0" cellspacing="0" style="empty-cells:show;width:516pt">
<tr style="height:14pt">
<td style="background-color:#003C78;border-bottom:2pt solid #FFFFFF;padding-bottom:3pt;padding-top:3pt;vertical-align:Bottom;width:339.64pt;"> <div style="line-height:10pt;text-align:left;"> <div style="margin-left:6pt;margin-right:6pt;margin-top:1pt;text-align:left;white-space:nowrap;"><span style="color:#ffffff;font-family:arial;font-size:8pt;font-weight:bold;margin-left:0.0pt">Fund</span></div> </div> </td>
<td style="background-color:#003C78;border-bottom:2pt solid #FFFFFF;padding-bottom:3pt;padding-top:3pt;vertical-align:Bottom;width:176.36pt;"> <div style="line-height:10pt;text-align:left;"> <div style="margin-left:6pt;margin-right:12pt;margin-top:1pt;text-align:center;white-space:nowrap;"><span style="color:#ffffff;font-family:arial;font-size:8pt;font-weight:bold">Prospectus and Summary Prospectus Dated</span></div> </div> </td> </tr>
<tr style="height:15pt">
<td style="background-color:#D9E5F1;border-bottom:2pt solid #FFFFFF;padding-bottom:3pt;padding-top:3pt;vertical-align:Bottom;width:339.64pt;"> <div style="line-height:10pt;text-align:left;"> <div style="margin-left:6pt;margin-right:6pt;text-align:left;white-space:nowrap;"><span style="color:#003c78;font-family:arial;font-size:8pt;margin-left:0.0pt">Columbia Funds Series Trust I</span></div> </div> </td>
<td style="background-color:#D9E5F1;border-bottom:2pt solid #FFFFFF;padding-bottom:3pt;padding-top:3pt;vertical-align:Bottom;width:176.36pt;"> <div style="line-height:0.5pt;text-align:left;"> <div style="margin-left:6pt;margin-right:12pt;text-align:center;white-space:nowrap;"><span style="color:#003c78;font-family:arial;font-size:8pt;margin-left:-85.18pt"> </span></div> </div> </td> </tr>
<tr style="height:11pt">
<td style="background-color:#D9E5F1;padding-bottom:2pt;padding-top:3pt;vertical-align:Bottom;width:339.64pt;"> <div style="line-height:9pt;text-align:left;"> <div style="margin-left:6pt;margin-right:6pt;text-align:left;white-space:nowrap;"><span style="color:#003c78;font-family:arial;font-size:8pt;margin-left:0.0pt"> Multi-Manager Small Cap Equity Strategies Fund</span></div> </div> </td>
<td style="background-color:#D9E5F1;padding-bottom:2pt;padding-top:3pt;vertical-align:Bottom;width:176.36pt;"> <div style="line-height:9pt;text-align:left;"> <div style="margin-left:6pt;margin-right:12pt;text-align:center;white-space:nowrap;"><span style="color:#003c78;font-family:arial;font-size:8pt;margin-left:0.00pt">1/1/2026</span></div> </div> </td> </tr> </table><div style="margin-top:12pt;"><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">On June 18, 2026, the Fund's Board of Trustees approved certain changes to the Fund's subadvisers and principal </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">investment strategies effective on or about August 21, 2026 (the Effective Date). As a result, from the Effective </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">Date, </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">Conestoga Capital Advisors, LLC (Conestoga)</span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic"> no longer serves as a subadviser to the Fund. Accordingly, as of </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">the Effective Date, the changes described in this Supplement are hereby made to the Fund’s Prospectus and Summary </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">Prospectus.</span></div><div style="margin-top:12pt;"><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">The information under </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">the heading “Principal Investment Strategies” in the Summary Prospectus and in both </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">the </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">“</span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">Summary of the Fund” and </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">“More Information About the Fund</span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">” </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">sections of the Prospectus between the fifth and </span><span style="color:#003c78;font-family:arial;font-size:10pt;font-style:italic">last paragraph is hereby superseded and replaced with the following:</span></div><div style="margin-top:4pt;"><span style="color:#003c78;font-family:arial;font-size:10pt">The Fund may also invest in exchange-traded funds (ETFs), including pending the engagement of one or more </span><span style="color:#003c78;font-family:arial;font-size:10pt">additional subadvisers.</span></div><div style="margin-top:4pt;"><span style="color:#003c78;font-family:arial;font-size:10pt">Columbia Management is responsible for providing day-to-day portfolio management of one sleeve of the Fund and </span><span style="color:#003c78;font-family:arial;font-size:10pt">is also responsible for oversight of the Subadvisers. The Fund’s Subadvisers are Hotchkis and Wiley Capital </span><span style="color:#003c78;font-family:arial;font-size:10pt">Management, LLC (Hotchkis & Wiley), J.P. Morgan Investment Management Inc. (JPMIM) and Jacobs Levy Equity </span><span style="color:#003c78;font-family:arial;font-size:10pt">Management, Inc. (Jacobs Levy). Columbia Management and the Subadvisers act independently of each other and </span><span style="color:#003c78;font-family:arial;font-size:10pt">use their own methodologies for selecting investments. Columbia Management, subject to the oversight of the </span><span style="color:#003c78;font-family:arial;font-size:10pt">Fund’s Board of Trustees, determines the allocation of the Fund’s assets to each sleeve and may change these </span><span style="color:#003c78;font-family:arial;font-size:10pt">allocations at any time.</span></div>
Columbia Funds Series Trust I
2026-01-01