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Monday Weakness Strategy

Monday Weakness notes that equities often open lower after the weekend as traders digest news and reposition. Short-term bearish pressure can appear at the start of the week before markets stabilize.

Testing indicates an average annual return of about 106%. It performs best in the stocks market.

The strategy sells short at Monday's open and covers by the close, seeking to profit from that initial softness.

Stops are kept narrow to avoid losses if the market bucks the tendency and rallies instead.

Details

  • Entry Criteria: calendar effect triggers
  • Long/Short: Both
  • Exit Criteria: stop-loss or opposite signal
  • Stops: Yes, percent based
  • Default Values:
    • CandleType = 15 minute
    • StopLoss = 2%
  • Filters:
    • Category: Seasonality
    • Direction: Both
    • Indicators: Seasonality
    • Stops: Yes
    • Complexity: Intermediate
    • Timeframe: Intraday
    • Seasonality: Yes
    • Neural networks: No
    • Divergence: No
    • Risk level: Medium
using System;
using System.Collections.Generic;

using Ecng.Common;

using StockSharp.Algo.Indicators;
using StockSharp.Algo.Strategies;
using StockSharp.BusinessEntities;
using StockSharp.Messages;

namespace StockSharp.Samples.Strategies;

/// <summary>
/// Implementation of Monday Weakness trading strategy.
/// Sells short on Monday if price below MA, covers on Wednesday.
/// Buys on Thursday if price above MA, exits Friday.
/// </summary>
public class MondayWeaknessStrategy : Strategy
{
	private readonly StrategyParam<int> _maPeriod;
	private readonly StrategyParam<DataType> _candleType;
	private readonly StrategyParam<int> _cooldownBars;

	private SimpleMovingAverage _ma;

	private int _cooldown;
	private DayOfWeek _prevDayOfWeek;
	private bool _enteredThisDay;

	/// <summary>
	/// Moving average period.
	/// </summary>
	public int MaPeriod
	{
		get => _maPeriod.Value;
		set => _maPeriod.Value = value;
	}

	/// <summary>
	/// Candle type for strategy.
	/// </summary>
	public DataType CandleType
	{
		get => _candleType.Value;
		set => _candleType.Value = value;
	}

	/// <summary>
	/// Cooldown bars between trades.
	/// </summary>
	public int CooldownBars
	{
		get => _cooldownBars.Value;
		set => _cooldownBars.Value = value;
	}

	/// <summary>
	/// Initializes a new instance of the <see cref="MondayWeaknessStrategy"/>.
	/// </summary>
	public MondayWeaknessStrategy()
	{
		_maPeriod = Param(nameof(MaPeriod), 20)
			.SetGreaterThanZero()
			.SetDisplay("MA Period", "Moving average period for trend confirmation", "Strategy");

		_candleType = Param(nameof(CandleType), TimeSpan.FromMinutes(5).TimeFrame())
			.SetDisplay("Candle Type", "Type of candles for strategy", "Strategy");

		_cooldownBars = Param(nameof(CooldownBars), 30)
			.SetDisplay("Cooldown Bars", "Bars between trades", "General")
			.SetRange(5, 500);
	}

	/// <inheritdoc />
	public override IEnumerable<(Security sec, DataType dt)> GetWorkingSecurities()
	{
		return [(Security, CandleType)];
	}

	/// <inheritdoc />
	protected override void OnReseted()
	{
		base.OnReseted();
		_ma = default;
		_cooldown = 0;
		_prevDayOfWeek = DayOfWeek.Sunday;
		_enteredThisDay = false;
	}

	/// <inheritdoc />
	protected override void OnStarted2(DateTime time)
	{
		base.OnStarted2(time);

		_ma = new SimpleMovingAverage { Length = MaPeriod };

		var subscription = SubscribeCandles(CandleType);
		subscription
			.Bind(_ma, ProcessCandle)
			.Start();

		var area = CreateChartArea();
		if (area != null)
		{
			DrawCandles(area, subscription);
			DrawIndicator(area, _ma);
			DrawOwnTrades(area);
		}
	}

	private void ProcessCandle(ICandleMessage candle, decimal maValue)
	{
		if (candle.State != CandleStates.Finished)
			return;

		if (!IsFormedAndOnlineAndAllowTrading())
			return;

		var close = candle.ClosePrice;
		var dayOfWeek = candle.OpenTime.DayOfWeek;

		// Reset entry flag on new day
		if (dayOfWeek != _prevDayOfWeek)
			_enteredThisDay = false;

		if (_cooldown > 0)
		{
			_cooldown--;
			_prevDayOfWeek = dayOfWeek;
			return;
		}

		// Monday: sell short if price below MA
		if (dayOfWeek == DayOfWeek.Monday && !_enteredThisDay && Position == 0 && close < maValue)
		{
			SellMarket();
			_cooldown = CooldownBars;
			_enteredThisDay = true;
		}
		// Wednesday: cover short
		else if (dayOfWeek == DayOfWeek.Wednesday && Position < 0 && !_enteredThisDay)
		{
			BuyMarket();
			_cooldown = CooldownBars;
			_enteredThisDay = true;
		}
		// Thursday: buy if above MA
		else if (dayOfWeek == DayOfWeek.Thursday && !_enteredThisDay && Position == 0 && close > maValue)
		{
			BuyMarket();
			_cooldown = CooldownBars;
			_enteredThisDay = true;
		}
		// Friday: exit long
		else if (dayOfWeek == DayOfWeek.Friday && Position > 0 && !_enteredThisDay)
		{
			SellMarket();
			_cooldown = CooldownBars;
			_enteredThisDay = true;
		}

		_prevDayOfWeek = dayOfWeek;
	}
}