R B SIENA LTDA: public contracts won without a rival in Brazil: 3 uncontested awards; 75% of its awards; 3 without a competition; 0 single bid.
Assay record ASY-BR-0B7IM0Z181 · Cite as: Assay Systems, “R B SIENA LTDA: public contracts won without a rival in Brazil”, https://assay-systems.com/register/br/uncontested/s/r-b-siena-ltda/
R B SIENA LTDA won 3 of its 4 public contract awards in Brazil without a rival from 2024-10-31 to 2026-05-29: 3 without a competition and 0 after a competition that drew a single bid. 1 buyer awarded it without a rival, the largest INSTITUTO FEDERAL DE EDUCACAO, CIENCIA E TECNOLOGIA DO PARANA with 3.
An award is uncontested when the buyer had no rival offer to weigh: it was made without a competition (direct award, negotiated procedure without a call for tenders, sole-source or advance-notice contract), or a competition was held and only one bid arrived. Every count below is built award by award from the official notices. Awards to individuals are not included.
INSTITUTO FEDERAL DE EDUCACAO, CIENCIA E TECNOLOGIA DO PARANA gave R B SIENA LTDA 4 awards: 3 without a competition, 0 after a competition with a single bid. First 2024-10-31, latest 2026-05-29.
| Date | Buyer | How | Stated reason |
|---|---|---|---|
| 2025-10-29 | INSTITUTO FEDERAL DE EDUCACAO, CIENCIA E TECNOLOGIA DO PARANA ocds-914jxj-15800906004022025 | No competition direct | tipoInstrumentoConvocatorioCodigo: 3; tipoInstrumentoConvocatorioNome: Ato que autoriza a Contratação Direta; modoDisputaId: 5; modoDisputaNome: Não se aplica; srp: false |
| 2025-08-08 | INSTITUTO FEDERAL DE EDUCACAO, CIENCIA E TECNOLOGIA DO PARANA ocds-914jxj-15800906002822025 | No competition direct | tipoInstrumentoConvocatorioCodigo: 3; tipoInstrumentoConvocatorioNome: Ato que autoriza a Contratação Direta; modoDisputaId: 5; modoDisputaNome: Não se aplica; srp: false |
| 2024-10-31 | INSTITUTO FEDERAL DE EDUCACAO, CIENCIA E TECNOLOGIA DO PARANA ocds-914jxj-15800906002682024 | No competition direct | tipoInstrumentoConvocatorioCodigo: 3; tipoInstrumentoConvocatorioNome: Ato que autoriza a Contratação Direta; modoDisputaId: 5; modoDisputaNome: Não se aplica; srp: false |
Every uncontested award in Brazil · All countries · R B SIENA LTDA in the register
Source: contract awards published by the Ministry of Management and Innovation in Public Services of Brazil (Compras.gov.br, federal government) in the Open Contracting Data Standard (data.open-contracting.org), licensed under CC BY 4.0; awards from January 2016 to 30 September 2026, accessed 15 October 2026. Awards are matched to their buyer and supplier as published. Values in these notices often state a framework ceiling rather than a contract amount, so awards are counted, not summed. Updated 17 October 2026.