In the dynamic realm of asset management, the debate over size and performance has long been a topic of contention. While larger managers often command attention with their substantial size, as measured by assets under management (AUM), smaller managers have garnered attention for their purported ability to deliver alpha. The magnitude of assets managed by an asset manager often plays a pivotal role in determining its choice of investment strategies and the universe of opportunities it can explore.
In this article, we focus on the opportunity sets available to managers of varying sizes, measured by their AUM. Our exploration is driven by the recognition that smaller managers, often praised for their potential to outperform, may possess a distinct advantage in the form of a more expansive opportunity set. Conversely, we aim to show how a diminishing opportunity set plagues larger managers, despite their seemingly vast resources.
Our analysis primarily focuses on defining the equity opportunity landscape available to asset managers across varying sizes in the South African market. We categorise hypothetical managers into three distinct groups based on their AUM: small or
boutique managers (R1 billion (bn), and R5 bn AUM), medium-size managers (R10bn, R20bn, and R50bn AUM), and large-size managers (R100bn and R200bn AUM).
The opportunity set for each manager size is defined as the set of companies within the FTSE/JSE All Share Index (ALSI) in which managers can hold at least 5% of any share without exceeding a 15% shareholding of the total free float market capitalisation. By capping shareholdings at 15%, the analysis mitigates concentration and ownership risk and ensures diversification within portfolios. It is also intended to manage and prevent market impact to a large degree. Limiting shareholdings to 5% of any share in a portfolio helps prevent market impact, particularly for smaller managers and also ensures some diversification and breadth in an investment portfolio. The 5% holding in a portfolio also represents a conviction view on shares outside the top 10 shares by market capitalisation.
Excessive buying or selling by a single manager can influence stock prices, potentially resulting in adverse market movements and impacting trade execution. This analysis accounts for the availability of shares in the market for trading by considering free float market capitalisation. Free-float market capitalisation reflects the portion of shares available for public trading, ensuring that the analysis focuses on investable stocks with a perception of sufficient liquidity through market cycles.
Opportunity set over time
Our analysis unveils compelling insights into the investment landscape across different asset manager sizes. We meticulously stratify asset managers based on their AUM, adjusting for total market capitalisation changes over time to ensure consistency. The evolving opportunity set over time for asset managers of different sizes is represented in Figure 1.
Figure 1: Change in opportunity set
Source: Momentum Investments Group
Table 1: Manager access to investable universe as at end of 2023 (% of listed shares)
With substantial AUMs at their disposal, larger managers are often perceived as wielding significant influence in the market. However, our analysis reveals a nuanced reality. These managers, overseeing AUMs of R100 billion and R200 billion, find themselves constrained, with access limited to a mere 44 and 29 shares on the JSE respectively, leaving them with access to only 35% and 23% of the investable universe. This constrained opportunity set underscores the challenges associated with managing colossal funds, where the pool of viable investment options shrinks considerably. Important to note that this view also does not consider the practical liquidity considerations on a day-to-day basis, which can also negatively impact the opportunity set.
Medium-sized managers encounter a different set of dynamics. With AUMs ranging from R10 billion to R50 billion, these managers enjoy a more extensive opportunity set compared to their larger counterparts. However, their scope remains constrained relative to smaller managers, with access restricted to 66 shares within the ALSI. This finding underscores the delicate balance these managers must strike between diversification and concentrated investment strategies.
Contrary to conventional wisdom, which often suggests that due to their limited resources and scale, boutique managers would have a restricted opportunity set compared to their larger counterparts, we found this not to be the case.
Our analysis reveals that smaller managers, overseeing AUMs as modest as R1 billion to R5 billion, are not hampered by a lack of investment options. On the contrary, these managers benefit from a more expansive opportunity set, with access to 127 shares within the ALSI in 2023, which is 100% access to the investable universe.
This broader scope empowers skilled smaller managers to pursue diverse investment strategies, potentially enhancing their ability to generate alpha amidst market fluctuations.
Figure 2: Change in opportunity set for different sized asset managers 2004 to 2023
Source: Momentum Investments Group
The limitation on the number of shares available for investment poses challenges for larger asset managers seeking to diversify their portfolios adequately. Surprisingly, our analysis reveals that while smaller managers experience a greater absolute reduction in
their opportunity sets, larger managers encounter a more pronounced impact in percentage terms, a decline of 18% for the smallest manager compared ro a 26% decline for the largest manager.
This constraint not only affects the breadth of investment options but also translates into a notable constraint on industry diversification within portfolios. In 2024, for instance, the analysis indicates that due to the available opportunity set, larger
managers structurally exhibit above-benchmark concentration in the basic materials, financials, and technology industries, with minimal allocation to sectors such as energy and real estate. Conversely, the smallest managers maintain a similar industry concentration as the benchmark. With a diminished pool of assets to select from, larger managers may face heightened competition for the most promising opportunities, potentially compromising their ability to achieve optimal risk-adjusted returns.
Figure 3: Opportunity set industry concentration in 2023
Source: Momentum Investments Group
Liquidity constraints
Liquidity plays a pivotal role in shaping investment decisions and portfolio management strategies. Recognising the importance of liquidity in navigating dynamic markets, we conducted a comprehensive analysis to assess the trading capacity of asset managers across different sizes. By examining the relationship between opportunity set size, daily trading turnover, and the ability to execute trades without moving the market, we provide valuable insights into the liquidity challenges and opportunities facing asset managers today.
Our analysis focused on quantifying the trading capacity of asset managers by determining the number of days it would take to trade out 100% of their AUM invested. To ensure minimal market impact, we restricted trading to no more than 10% of
each company’s daily turnover.
Figure 4 presents the average number of trading days per manager from 2004 to 2023. The analysis revealed a clear trend: Smaller managers consistently demonstrated greater trading capacity compared to their larger counterparts. On average, a manager
overseeing R1 billion in AUM could completely trade out their portfolio in approximately 40 days, whereas a manager with R200 billion AUM would require approximately 330 days, representing a staggering eightfold increase in trading duration.
This disparity can be attributed to the smaller size of their opportunity sets and the higher reliance on the liquidity of the companies within their portfolios due to larger components of free float market capitalisation that need to be traded. Consequently, smaller managers are better equipped to execute trades efficiently and without undue market impact, enabling them to capitalise on investment opportunities with greater agility. In contrast to this trend, it will take managers with R100 billion AUM an average of 440 days, which is more than managers with R200 billion. This is because their
opportunity sets allow them to have access to both less liquid mid-caps compared to the largest manager with access to only large-caps.
Figure 4: Average trading days per manager 2004 to 2023
Source: Momentum Investments Group
To provide a more nuanced view of liquidity dynamics, we also examined the proportion of the opportunity set that can be traded out within 30, 60 and 90 days. This considers the relative size of the opportunity set that can be readily traded within short time horizons, providing insights into the immediacy and depth of liquidity available to managers. It allows for a comparative analysis of liquidity conditions across manager sizes and periods, highlighting changes in market liquidity over time and potential differences in liquidity risk exposure among managers. While smaller managers consistently demonstrate greater trading capacity, we observe significant improvements in liquidity conditions over the two decades under review. Specifically, there is a notable increase in the percentage proportion of the opportunity set that can be traded out within 30, 60, and 90 days. However, the extent of this improvement varies across manager sizes, with larger managers experiencing more pronounced gains in trading capacity compared to their smaller counterparts. This increase in liquidity could be attributed to several factors, as over time, financial markets may become more liquid and efficient, leading to improved trading conditions for asset managers.
Factors such as advancements in technology, regulatory reforms, and increased investor participation can contribute to enhanced market liquidity, allowing for smoother trade execution and reduced trading frictions.
The expansion of market participants, including institutional investors, hedge funds, and algorithmic traders, may also have bolstered trading activity and liquidity. Greater market depth and breadth enable asset managers to access a larger pool of
liquidity, facilitating faster and more efficient trade execution. Despite the overall improvement in market liquidity, the extent of this enhancement may vary across manager sizes. Larger managers, with greater resources and market influence, may have been better positioned to leverage improvements in market liquidity, resulting in more pronounced gains in trading capacity compared to their smaller counterparts. Moreover, the opportunity sets of larger managers are often limited to large-cap stocks, which tend to be highly liquid compared to the small and mid-cap companies within the opportunity sets of smaller managers. This disparity in liquidity access underscores
the ongoing challenges smaller managers face in efficiently executing trades and navigating liquidity constraints, despite broader market improvements.
Table 2: Proportion of portfolio that can be traded out
Source: Momentum Investments Group
Benchmark relative analysis
Expanding on the analysis, we explore alternative definitions of the opportunity set to gain deeper insights into the implications for asset managers of different sizes. Firstly, we consider a scenario where managers are restricted to holding securities at benchmark weightings, effectively mirroring the composition of the ALSI. Under this framework, all managers have access to the full investable universe. However, adherence to benchmark weights inherently limits the potential for above-benchmark performance, constraining managers’ ability to capitalise on alpha-generating opportunities.
Figure 5: Opportunity set industry concentration in 2023
Source: Momentum Investments Group
In contrast, we investigate the implications of overweighting benchmark positions by 5%, allowing managers to deviate from benchmark weights in pursuit of potential outperformance. Despite this strategic adjustment, our analysis reveals that the concentrated nature of the ALSI, with the top 10 companies accounting for over 45% of the index, significantly constrains the opportunity set. As a result, the difference in opportunity set size between holding an absolute 5% compared to overweighting the index by 5%, is marginal.
Larger managers continue to face constraints, with access limited to only 24 companies, while smaller managers retain access to the full 127 companies within the index. Thus, while overweighting benchmark positions may offer some latitude for active management, the inherent concentration of the ALSI limits the extent to which managers can diversify their portfolios and access new investment opportunities, underscoring the enduring challenges faced by larger managers in navigating constrained opportunity sets.
Conclusion
The findings of our analysis carry significant implications for asset managers, investors, and industry stakeholders alike. Understanding the nuanced dynamics of opportunity sets across different manager sizes can inform strategic decision-making and portfolio construction strategies. While larger managers grapple with the challenge of navigating a constrained universe of investment options, smaller managers can leverage their flexibility to explore a broader array of opportunities.
Our analysis also underscores the importance of agility and adaptability in the ever-evolving landscape of asset management. Rather than being solely dictated by the size of AUM, success in the industry hinges on the ability to identify and capitalise on opportunities, irrespective of organisational scale.
Our comparative analysis sheds light on the intricate relationship between AUM size and the opportunity set available to asset managers within the ALSI. By unravelling these dynamics, we aim to provide actionable insights that empower industry participants to navigate the complexities of the South African equity market with confidence and foresight. Additionally, a potential avenue for future research could involve investigating the ability of asset managers to extract factor premia based on these opportunity sets. This analysis could provide valuable insights into the effectiveness of different manager sizes in capturing factor-based returns and optimising portfolio performance.
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