Business
Ciena Set to Join S&P 500; Arrowhead Pharmaceuticals to Join S&P MidCap 400; ADT and OneSpaWorld Holdings to Join S&P SmallCap 600
S&P Dow Jones Indices will make the following changes to the S&P 500, S&P MidCap 400, S&P SmallCap 600:
About this update from Ciena Corporation
[{"type":"text","content":"NEW YORK, Feb. 4, 2026 /PRNewswire/ -- S&P Dow Jones Indices will make the following changes to the S&P 500, S&P MidCap 400, S&P SmallCap 600:","length":158,"tagName":"p"},{"type":"list","items":[{"val":[{"type":"text","content":"S&P MidCap 400 constituent Ciena Corp. (NYSE: CIEN) will replace Dayforce Inc. (NYSE: DAY) in the S&P 500, S&P SmallCap 600 constituent Arrowhead Pharmaceuticals Inc. (NASD: ARWR) will replace Ciena in the S&P MidCap 400, and ADT Inc. (NYSE: ADT) will replace Arrowhead Pharmaceuticals in the S&P SmallCap 600 effective prior to the opening of trading on Monday, February 9. Thoma Bravo L.P. acquired Dayforce in a deal that closed today.","length":463,"tagName":"p"}]},{"val":[{"type":"text","content":"OneSpaWorld Holdings Ltd. (NASD: OSW) will replace Dynavax Technologies Corp. (NASD: DVAX) in the S&P SmallCap 600 effective prior to the opening of trading on Tuesday, February 10. Sanofi is acquiring Dynavax Technologies in a deal expected to be completed soon pending final closing conditions.","length":300,"tagName":"p"}]}],"tagName":"ul","bulletedList":true,"length":763,"olType":false},{"type":"text","content":"Following is a summary of the changes that will take place prior to the open of trading on the effective date:","length":110,"tagName":"p"},{"type":"table","headerItems":[],"items":[{"val":[{"colspan":"1","rowspan":"1","style":"PADDING-RIGHT:0.17em;PADDING-LEFT:0.17em;VERTICAL-ALIGN:BOTTOM;TEXT-ALIGN:CENTER;","val":[{"type":"text","content":"Effective Date","length":14,"tagName":"p","attribs":{}}]},{"colspan":"1","rowspan":"1","style":"PADDING-RIGHT:0.17em;PADDING-LEFT:0.17em;VERTICAL-ALIGN:BOTTOM;TEXT-ALIGN:CENTER;","val":[{"type":"text","content":"Index Name","length":10,"tagName":"p","attribs":{}}]},{"colspan":"1","rowspan":"1","style":"PADDING-RIGHT:0.17em;PADDING-LEFT:0.17em;VERTICAL-ALIGN:BOTTOM;TEXT-ALIGN:CENTER;","val":[{"type":"text","content":"Action","length":6,"tagName":"p","attribs":{}}]},{"colspan":"1","rowspan":"1","style":"PADDING-RIGHT:0.17em;PADDING-LEFT:0.17em;VERTICAL-ALIGN:BOTTOM;TEXT-ALIGN:CENTER;","val":[{"type":"text","content":"Company Name","length":12,"tagName":"p","attribs":{}}]},{"colspan":"1","rowspan":"1","style":"PADDING-RIGHT:0.17em;PADDING-LEFT:0.17em;VERTICAL-ALIGN:BOTTOM;TEXT-ALIGN:CENTER;","val":[{"type":"text","conte...