Understanding Active Managers' Buying Behavior and Short Interest Trends

Author:

S3 Research Team

June 9, 2025

Some actively managed funds appear to increase ownership in falling stocks, even as short interest rises. This behavior suggests a contrarian approach, where managers see opportunity in valuation rather than momentum. This trend does not apply to all stocks but is notable in names like Moderna.

When we look at stocks like Moderna and others that are down and increasing short interest, we find that in some cases, the active manager ownership percentage increases on the way down.

My image alt text

This is part of a pattern of stocks that are up and down often.

My image alt text

My image alt text

The active managers may be keeping their price target or valuation as the stock goes lower, making them think the stock is cheap.

The active managers may be using technical analysis and buying on the way down.

In either case, the active manager is following a reversal strategy, and the passive managers are keeping a more constant exposure.

This is analogous to the investors who cover/buy on the way down.

Active managers on the long side tend to be more reversal/value investors than momentum investors.

This pattern only works for some names. In other names, the ownership does not change on the way down and is constant.

The passive ownership goes in the opposite direction with it gaining on the way up;

There is move variation in the up stocks then the down stocks.

My image alt text

Active managers may view weakness in some stocks as opportunity, increasing ownership despite market pessimism. This reversal strategy contrasts with passive investor behavior and reflects a more valuation-driven approach. Such positioning may influence future price recovery in specific names.


Want to know more? Access this data in real time using S3’s BLACK APP


The information herein (some of which has been obtained from third party sources without verification) is believed by S3 Partners, LLC (“S3 Partners”) to be reliable and accurate. Neither S3 Partners nor any of its affiliates makes any representation as to the accuracy or completeness of the information herein or accepts liability arising from its use. Prior to making any decisions based on the information herein, you should determine, without reliance upon S3 Partners, the economic risks, and merits, as well as the legal, tax, accounting, and investment consequences, of such decisions.

Related Articles

The Magnificent 7: Analyzing Non-Cap-Weighted Long and Short Investor Behavior

June 6, 2025

Short Interest Trends in S&P 500: Lower Priced Stocks Attract More Short Sellers

May 27, 2025

War-Gaming the Next Squeeze: Integrating Short Interest Into Portfolio Risk Monitoring

May 22, 2025