MetaTrader 4 launched in 2005 and MetaTrader 5 in 2010. They use different trading APIs and programming languages, so platform choice depends on supported instruments, account mode and the tools you need. This comparison examines those concrete differences; no verified market-share percentage for regulated ECN brokers is established here.

A brief history — why MT5 was built at all

MT4 developed a substantial ecosystem of indicators and Expert Advisors. Existing MQL4 tools can make it costly to migrate, but their presence does not establish a historical percentage of EU retail platform users.

What eventually held MT4 back was everything it had never been designed for. Brokers who offered CFDs on shares, futures and options alongside forex needed a platform that could handle those instruments. MT5 expanded the trading and market-data tools available to brokers, including Depth of Market with broker-supplied price and volume data. MT4 also has a Depth of Market interface, so the distinction is not simply whether a depth window exists. Those are the gaps MetaQuotes closed in MT5, which is not a "better MT4" but a separate project written from scratch in a different paradigm.

Platform software and retail-client rules are separate matters. A platform change does not by itself change the contracted entity, client classification or legal protection. No evidence here establishes that the historical ESMA intervention caused or accelerated migration to MT5.

Increasing a position can replace its stop loss

On MT5 netting accounts, inspect the new order's parameters and then the position. This example explicitly sends SL = 0; it does not describe an ordinary panel click.

Increasing a position can replace its stop lossAfter the increase, volume is 0.50 lot and the SL is removed under the stated netting rule for an explicitly supplied zero.MODEL / THE KEY DISTINCTIONBefore: one long position0.40 lot, existing SLNew order in the same directionBuy 0.10 lot; explicit SL = 0After the netting fill completes0.40 + 0.10 = 0.50 lotCheck the protectionThe new zero removes the previous SL

Hypothetical volumes; an MT5 netting account, the same symbol, a fully executed increase and SL = 0 explicitly supplied with the order. Ignore TP, costs and price. This does not apply to every submission method: the documentation separately describes automatic level insertion and One Click Trading. The document MT5 — SL and TP inheritance confirms replacement of SL/TP when increasing a netting position and deletion with explicit zero values; it also describes submission-method exceptions.

After the increase, volume is 0.50 lot and the SL is removed under the stated netting rule for an explicitly supplied zero.

Do not assume that a larger position retains its earlier protection. When migrating an automated strategy, reproduce this case on demo and inspect the actual SL after execution. Checking the field is more concrete than assuming a newer platform always inherits settings.

What MT5 does better than MT4 — eight concrete differences

The list is not marketing. These are measurable differences that affect daily trading:

  • Instrument coverage — MT5 supports forex and exchange-market functionality. The broker’s actual account and product document determine which instruments are available and whether a familiar stock symbol represents a share or CFD.
  • Order types — MT5 has six pending types, adding Buy/Sell Stop Limit to the four conventional Limit and Stop types. Fill policies such as FOK and IOC depend on the symbol’s execution mode and server settings and can matter for a market order too. A stop-limit activation places a limit request; it does not guarantee a position.
  • Depth of Market — both platforms have a Depth of Market interface. MT5 can display price and volume data supplied by the broker; an OTC broker's view is not the complete global forex order book. Check what data your account actually provides.
  • Strategy Tester — MT5 supports multiple symbols and independent agents running optimisation passes in parallel. Actual speed depends on data, modelling and code; the architecture does not guarantee a fixed multiple over MT4 or faster live fills.
  • Economic calendar — built directly into MT5, with alerts before CPI, NFP and FOMC releases. On MT4 it requires third-party plugins.
  • Account models — MT5 runs either in hedging mode (each trade is a separate position) or netting mode (one net position per instrument). MT4 knows hedging only.
  • Programming language — both modern MQL4 and MQL5 support object-oriented programming. Their trading interfaces differ, so porting an Expert Advisor requires checking its order and position logic rather than changing a platform name.
  • Tester resources — MT5’s Strategy Tester supports multiple agents and parallel tasks. Distinguish tester parallelism from a claim that every terminal operation uses every processor core.

Even manual trading needs the right pending orders, position model, chart tools and report. MT4 has nine standard timeframes and MT5 twenty-one. Which differences matter depends on the actual workflow, not a universal number of weekly trades. The account model when choosing a broker is one part of that comparison.

When MT4 still makes sense — three scenarios

Existing tools, account availability and required operations can justify keeping MT4. These are examples to assess, not a market-share claim or an exhaustive list of acceptable choices.

If an Expert Advisor is available only in MQL4, compare keeping a supported MT4 account with commissioning a port. The work depends on source access, libraries and trading logic; request a quote for the actual program instead of assuming a standard number of hours or a EUR 200–500 fee.

Second: your broker offers MT4 only and the account still meets your requirements. Check instrument availability, execution, support and security rather than treating the platform name alone as evidence of broker quality. If you need features specific to MT5, compare an appropriate MT5 account before switching.

Third: manual FX trading may need only features available on both platforms, but their built-in indicators, drawing tools, timeframes and pending types are not identical. Check the specific operations. On MT5 netting, a 0.50-lot long followed by a new 0.30-lot sell leaves 0.20 lot long after full execution; on hedging it can create separate long 0.50 and short 0.30 positions with different costs and margin.

cTrader, TradingView and proprietary platforms — the alternatives

Other options include cTrader, TradingView and proprietary platforms such as SaxoTraderGO. Compare the required orders, chart functions, automation compatibility, reports and actual broker connection. A platform brand or programming-language name alone does not establish superior stability, transparent execution or the best analytical tools.

Choose the platform offered for the relevant entity and account that supports the operations you need. No current industry-standard or scalper-preference statistic is established here. A familiar interface can help operation, but does not certify the provider or its execution.

What to do tomorrow

  1. Check which platform your broker actually offers. Inspect the current platform list for your entity and account. An MT4-only offer is not by itself evidence of poor broker quality. Compare the required functionality, execution, support and security before switching. Related reading: the broker selection checklist.
  2. Reproduce needed operations on a suitable demo. Check order entry, SL/TP, partial reduction, cancellation and report export before considering migration. In a hypothetical Buy Stop Limit, ask 1.10050 is below stop 1.10100; a jump to 1.10200 activates Buy Limit 1.10080 but does not fill it at that worse ask. A later return to the limit can permit a fill under the remaining rules. No fixed minutes or session count guarantees readiness.
  3. If you run an MQL4 EA, obtain a scoped porting estimate. Provide the source, dependencies and required account mode to a developer, and specify demo validation of order handling. Profit history does not guarantee that a port is economical or correct.
  4. Check the account model. The broker sets netting or hedging for the account. Confirm the available mode and migration procedure rather than assuming regional preference. Opposing positions are separate on hedging; they do not create free protection or universally lower risk.
  5. Add an annual platform review date to your calendar. Every twelve months check whether your platform is still actively supported by the broker and whether MetaQuotes (or Spotware for cTrader) is shipping security updates. A platform without updates is a long-term security risk to the account.