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Key Inclusion Criteria:

* Patient had to be able to understand and communicate with the investigator and comply with the requirements of the study and had to give a written, signed and dated informed consent before any study assessment was performed.
* Male or non-pregnant, non-lactating female patients ≥ 18 years of age.
* Clinical diagnosis of active, moderate to severe TED (not sight-threatening) in the study eye at Baseline associated with 2 or more of the following:

  * Lid retraction \>= 2 mm
  * Moderate or severe soft tissue involvement
  * Exophthalmos \>= 3 mm above normal
  * Inconstant or constant diplopia
* Onset of TED symptoms fewer than 12 months prior to Baseline.
* CAS \>= 4 (on a 7-point scale, with a score of \>= 3 indicating active TED) in the more severely affected (study) eye at Screening and Baseline. Note: Proptosis is the primary qualifier for selection of the study eye. In case both eyes showed a similar degree of proptosis, other inflammatory signs and symptoms (CAS) were taken into account by the investigator for the selection of the study eye.
* Peripheral euthyroidism or mild hypo-/hyperthyroidism defined as free T3 (fT3) and free T4 (fT4) \< 30% above/below normal limits at Screening. Every effort was to be made to correct the mild hypo-/hyperthyroidism promptly and to maintain the euthyroid state until the end of this study.
* Orbital MRI assessment available confirming the diagnosis of TED for patients initially presenting with hypo- or euthyroidism (without treatment for hyperthyroidism) before or at the time of TED diagnosis (to rule out other potential causes of orbital signs and symptoms.

Key Exclusion Criteria:

* Improvement in CAS of \>= 2 points and/or improvement in proptosis of \>= 2 mm in the study eye between Screening and Baseline.
* Signs of sight-threatening TED defined by optic neuropathy or severe corneal injury.
* Patients, in the opinion of the investigator, requiring immediate or urgent medical treatment with glucocorticoids for TED.
* Patients requiring immediate surgical ophthalmological intervention or planning corrective surgery/irradiation during the course of the study.
* Decreased best corrected visual acuity (BCVA) as defined by a decrease in vision of 2 lines on the Snellen chart, new visual field defect or color defect within the last 6 months.
* Any other ophthalmic and/or orbital disease or condition that might interfere with the assessment of TED.
* Previous orbital radiotherapy.
* Previous ophthalmological/orbital surgery for TED (e.g., orbital decompression).
* Previous use of biological agents for the treatment of TED.
* Previous use of systemic, non-biologic, immunomodulatory agents for the treatment of TED (e.g., mycophenolate or cyclosporine).
* Previous exposure to secukinumab or other biologic drugs directly targeting IL-17A or the IL 17 receptor (e.g., ixekizumab, brodalumab).
* Previous treatment with rituximab, tocilizumab or teprotumumab.
* Previous use of systemic corticosteroids for the treatment of TED, except for oral corticosteroids with a cumulative dose equivalent to \< 1 g oral prednisone/prednisolone if the corticosteroid was discontinued at least 4 weeks prior to Baseline.
* Previous treatment with any cell-depleting therapies including but not limited to anti-cluster of differentiation 20 (CD20) or investigational agents (e.g., CAMPATH, anti CD4, anti-CD5, anti-CD3, anti-CD19).
* Use of other investigational drugs within 5 half-lives of enrollment or within 30 days, whichever is longer.
* Previous or ongoing use of prohibited treatments (see Appendix 16.1.1-Protocol Section 6.2.2). Respective washout periods detailed in this section needed to be adhered to.
* History of hypersensitivity to any of the study drug constituents.

Other protocol defined Inclusion/Exclusion may apply.

• Essen, Germany
• Frankfurt, Germany
• Freiburg im Breisgau, Germany
• Göttingen, Germany
• Mainz, Germany