User acquisition teams that rely on just one source of Android installs are running financial and strategic risks. For mobile app marketers, an effective OEM inventory diversification strategy is one of the strongest ways to spread risk, control costs and improve performance. With multiple OEM partners like Xiaomi Ads, Samsung Ads, vivo inventory and Transsion placements, it has become critical to know when to lean in and when to spread budgets, especially as competition on traditional channels tightens and costs rise globally. Why OEM Inventory Matters for UA Budgets OEM advertising has moved from a niche experiment to a must-have growth engine for Android apps. Device manufacturers give advertisers access to high-intent users directly on phones, via setups, built-in stores, preloads and system recommendations. Because these placements are native to the device, OEM traffic often converts more efficiently than external placements and can deliver lower CPIs, notably in markets where Android dominates. That’s why UA teams are shifting spend from traditional ad networks into on-device ecosystem channels. [turn0search0][turn0search2] Different OEM inventories serve different audiences and regions. Xiaomi’s GetApps inventory reaches hundreds of millions of users globally, Samsung’s Galaxy Store and native placements offer premium reach in Europe and LATAM, vivo’s V-Appstore pulls in engagement in Southeast Asia and India, and Transsion (with its brands TECNO, itel and Infinix) leads in Africa and parts of South Asia.  How to Allocate Budget Between Xiaomi, vivo, Transsion and Samsung A good rule of thumb for OEM budget allocation is to let device market share and regional strength guide your spend. Use data on local vendor share to create a matrix that aligns your guessing with scale. For example: 1. Start with Market Share Mapping Before breaking out budgets, map where each OEM has strength in your priority geographies. In Latin America for example, Samsung and Xiaomi often cover half the shipments, so allocating significant portions of spend to both can cover a large share of users. In Africa, Transsion may control over half of devices, so a Transsion-first strategy makes sense there. In Southeast Asia, a mix of Xiaomi and Transsion inventory can significantly boost reach.  A basic formula is to prioritize 2–3 OEMs that collectively cover at least 60 percent of device shipments in each key market. That way you are targeting the largest possible audience through native placements where users are already active. 2. Understand Cost and Competitive Dynamics Different OEM inventories also come with different cost structures and competitive intensities. For example: Because of these differences, you should evaluate cost per conversion and retention trends by OEM source rather than treating all installs equally. Start with a small test budget on each vendor and scale based on early cost efficiency and post-install value. 3. Sequence Your Spend for Stability It’s also important to sequence how you spend budget. Begin with OEM placements that give you rapid install density and early traction. For example, preloads or recommended slots from a dominant OEM in a given region can deliver quick volume. Once you have sufficient performance data, layer in store featuring and native promotion units for sustained traction. Finally, monitor day 0 to day 7 retention and CAC variation geo by geo and shift spend toward the vendors showing better value. This staged approach helps smooth out cost volatility and gives UA teams real metrics for optimization. When Concentration on One Vendor Becomes a Risk Putting too much budget behind a single OEM partner can create strategic exposure. Here are common risk scenarios: Overdependence on One Channel When a large share of your installs and revenue come from a single OEM source, you become vulnerable to changes in that vendor’s algorithm, inventory rules, pricing, or policy updates. Diversification spreads this operational risk. Regional Supply Constraints In some regions, certain OEMs might have shrinking device shipments or market share due to broader industry trends. For example, global manufacturing and device supply fluctuations can affect inventory availability on certain OEM channels, potentially increasing competition and costs. When that happens, tapping only one source can leave your campaigns short of scale or at higher prices. Cost Escalation and Saturation Some OEM inventories may experience concentration of advertiser demand, driving up cost per install over time. If you’re heavily concentrated on that single source, you may see CPI increases without the efficiency gains you expect. That’s why spreading budget across Samsung, Xiaomi, vivo and Transsion can reduce pressure and help maintain diverse cost profiles. Practical Allocation Guidelines Here is a generalized allocation framework that many UA teams find effective: These allocations should be adjusted over time based on actual performance data. What matters most is that you maintain flexibility and avoid betting everything on one single OEM source. Why OEM Inventory Diversification Works A diversified strategy is not just about volume. It lets you: In short, treating OEM inventory as a strategic complement to traditional UA channels helps brands scale responsibly and sustainably. Conclusion Smart budget allocation across Xiaomi, Samsung, vivo and Transsion begins with mapping market share and understanding where each vendor drives reach and value. As UA teams gain performance data, sequencing spend and continuously reallocating based on observed efficiency and retention will create a resilient and cost-effective OEM strategy. Focusing too heavily on one vendor can be risky, especially in markets where device shipments fluctuate or where competitive pressure changes quickly. A diversified OEM approach gives your mobile UA plans a powerful foundation for sustained growth.