Assenagon Asset Management Boosts Stake in Alliant Energy

The institutional investor increased its holdings in the utility company by nearly 144% in the fourth quarter.

Mar. 27, 2026 at 7:22am

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Assenagon Asset Management S.A. grew its stake in Alliant Energy Corporation (NASDAQ:LNT) by 143.9% during the fourth quarter, according to a recent 13F filing with the Securities and Exchange Commission. The institutional investor now owns 255,377 shares of the company's stock, up from 104,714 shares held previously.

Why it matters

Alliant Energy is a major electric and natural gas utility serving customers primarily in Wisconsin and Iowa. Institutional investors like Assenagon closely monitor and trade the stock, which can impact the company's share price and access to capital.

The details

Assenagon Asset Management S.A. acquired an additional 150,663 shares of Alliant Energy in the fourth quarter, bringing its total holdings to 255,377 shares. This represents about 0.10% of the company's outstanding stock. The investment firm cited Alliant Energy's strong financial performance and growth potential as reasons for increasing its stake.

  • Assenagon acquired the additional 150,663 shares during the fourth quarter of 2025.

The players

Assenagon Asset Management S.A.

An institutional investment firm that manages assets for clients.

Alliant Energy Corporation

A publicly traded energy holding company that provides regulated electric and natural gas utility services in the American Midwest.

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The takeaway

Alliant Energy's growing institutional investor base signals confidence in the company's long-term prospects, as it continues to invest in renewable energy and infrastructure to serve its Midwest customer base.