Here are the leading B2B e‑commerce platforms operating in Africa (summary, what they do, where they operate and recent scale/signals). I focused on platforms that serve manufacturers/wholesalers and informal retail networks (shops, kiosks, dukas) — the dominant B2B e‑commerce use case on the continent.

1. MaxAB / Wasoko (merged / combined group — often referred to as MaxAB‑Wasoko)

• What: Pan‑African B2B grocery/ FMCG marketplace + end‑to‑end logistics and merchant credit (serves small retailers and wholesalers). The combined group resulted from MaxAB (Egypt) and Wasoko (formerly Sokowatch, East Africa).
• Where: Egypt, Kenya and several other markets across East & North Africa; growing pan‑Africa footprint after merger and acquisitions.
• Why notable: large combined merchant network and significant funding/scale as a merged entity. (launchbaseafrica.com)

2. TradeDepot

• What: Nigerian‑headquartered B2B e‑commerce and embedded‑finance platform linking FMCG manufacturers and distributors to thousands of small retailers (also provides credit/BNPL to merchants).
• Where: Nigeria (primary), expanding regionally (presence/expansion into other African markets).
• Why notable: large merchant coverage and substantial equity + debt raises to scale B2B + BNPL product offering. (cbinsights.com)

3. Wasoko (brand formerly Sokowatch; now part of MaxAB‑Wasoko in many markets)

• What: B2B ordering + last‑mile distribution for small retailers (orders via app/SMS, same‑day delivery and merchant credit).
• Where: East and West African markets (Kenya, Tanzania, Rwanda, Uganda, plus expansions into West Africa before/around the merger).
• Why notable: was a high‑profile regional B2B logistics + marketplace with large Series B funding and wide merchant adoption. (techcrunch.com)

4. Twiga Foods

• What: Kenya‑based B2B food distribution platform focused on fresh produce and FMCG — connecting farmers/suppliers to small retailers via technology, warehouses and logistics; offers ordering, distribution and some fintech capabilities.
• Where: Kenya (primary), with regional ambitions/operations.
• Why notable: large retailer network in Kenya and strong partnerships to scale FMCG distribution; widely cited as a leading agri‑tech B2B player. (twiga.com)

5. OmniRetail (OmniRetail Group / Omnibiz / Mplify)

• What: Nigeria‑based B2B retail‑tech group that digitizes FMCG supply chains — platforms that connect manufacturers, distributors and retailers and add payments/credit and logistics services.
• Where: Nigeria, expanding into other West African markets (expansion into Ghana, Ivory Coast reported).
• Why notable: recognized for fast growth in West Africa and an integrated, asset‑light B2B stack serving hundreds of manufacturers, thousands of distributors and many thousands of retailers. (ft.com)

Other relevant B2B / supply‑chain digital platforms to watch (specialty or supportive roles)

• Fatura (Egypt) — asset‑light B2B marketplace (acquired/integrated into larger players like MaxAB‑Wasoko). (launchbaseafrica.com)
• Kobo360, Lori and other logistics/marketplace players — mostly logistics and freight (not pure B2B e‑commerce marketplaces but important for B2B supply chain).
• Local / country platforms and distributor marketplaces — many African markets have strong local B2B players and regional integrators (these vary by country and evolve quickly).

Notes on selection and timing

• B2B e‑commerce on the continent is concentrated in FMCG, grocery and fresh produce: platforms that combine ordering + logistics + working capital (BNPL) have been the fastest growing and best‑funded.
• The competitive/ownership landscape has been evolving rapidly (mergers, acquisitions and rebrands — e.g., Sokowatch → Wasoko and the MaxAB–Wasoko combination), so market positions and country footprints can change quickly. The platform summaries above are based on recent public reporting and company disclosures. (techcrunch.com)

If you’d like, I can:

• Rank these by a specific metric (merchant count, funding, geographic footprint) if you tell me which metric matters most; or
• Prepare a one‑page comparison (geography, merchant reach, logistics model, BNPL/financing, recent funding/events) with links to sources.