13D Filings: What Activist Investors Are Pushing For In Q1 2026

When an investor acquires more than 5% of a public company with the intent to influence its direction, they file a Schedule 13D with the SEC — and they have to disclose why. The "Item 4" section of each filing describes the filer's purpose, which can range from a simple statement of investment intent to a detailed account of merger proposals, director nominations, and standstill agreements. Reading across those filings in Q1 2026 offers a different lens on the market: not earnings or price, but who is pushing whom, and toward what.

Several threads emerged across the data this quarter — some resolving, some still escalating.

Starboard and TripAdvisor reach a settlement

In February, Starboard Value LP sent a letter to TripAdvisor (TRIP) criticizing the board for a "long history of poor performance" and announcing its intent to nominate a majority slate of director candidates. Starboard, holding roughly 9.4% of shares, called for an objective review of strategic alternatives including a potential sale of the company. By March 22, the two sides had reached an agreement: TripAdvisor would expand its board from eight to ten seats, immediately appoint two of Starboard's recommended independent directors, and allow Starboard to designate two additional nominees for the 2026 annual meeting. Two incumbent directors agreed not to stand for re-election. The stock rose about 7% on the news. The agreement came with standstill provisions keeping Starboard from running a proxy contest through the 2027 cycle — a typical resolution for this kind of campaign, with the activist getting board influence in exchange for backing down from an escalated fight.

An industry rival moves on Sturm Ruger

The situation at Sturm, Ruger & Company (RGR) is less a traditional activist campaign and more an attempted acquisition by a competitor. Beretta Holding S.A., the Italian firearms conglomerate, has been building a stake in Ruger since late 2024 and now holds 9.95%. In February 2026, Beretta nominated four directors for Ruger's 2026 annual meeting. On March 25, it went further: Beretta sent a letter to Ruger's board stating it was prepared to launch a tender offer for up to 20.05% of outstanding shares at $44.80 per share — about a 20% premium to the 60-day volume-weighted average price — conditional on Ruger granting an exemption from its poison pill, which the board had adopted in October 2025. The offer was conditioned on that exemption being granted by March 31. Beretta's stated goal is to reach 30% ownership, which would give it a meaningful blocking position even short of control. Ruger's board has not publicly indicated it will grant the exemption.

A shipping battle turns into a proxy war

Diana Shipping Inc. (DSX) has been pursuing Genco Shipping & Trading (GNK) since November 2025, when it submitted an initial $20.60 per share proposal to acquire all shares it does not already own. Genco's board rejected that offer, then suggested a counterproposal for Genco to acquire Diana instead. Diana rejected the counterproposal, calling it unactionable. In March 2026, Diana raised its offer to $23.50 per share and lined up $1.433 billion in committed financing from DNB Carnegie and Nordea, plus a side agreement with Star Bulk Carriers (SBLK) to acquire 16 of Genco's vessels for $470.5 million upon deal close. Genco's board rejected the revised offer on March 19, calling it substantially undervalued. On March 23, Diana filed a preliminary proxy statement to replace Genco's entire board with six nominated directors and to force a strategic alternatives process. Diana holds 14.8% of Genco's shares. The annual meeting, where this contest will play out, has not yet been scheduled.

Nelson Peltz converts a campaign into a buyout

The Janus Henderson Group (JHG) story illustrates one way activist campaigns can end. Trian Fund Management — the vehicle through which Nelson Peltz invests — built a roughly 20% stake in the asset manager over a period of years. Rather than agitating from the outside, Trian moved toward a full acquisition: Janus Henderson agreed to be acquired by Trian and General Catalyst in an all-cash deal originally priced at $49 per share. A competing proposal from Victory Capital emerged during the process. On March 24, Trian and General Catalyst raised their offer to $52 per share — their "best and final" price — and Janus Henderson's board unanimously reaffirmed its recommendation. The shareholder vote is scheduled for April 16, 2026, with the transaction expected to close in mid-2026. At $52, the deal values Janus Henderson at approximately $7.4 billion.

Smaller campaigns with sharper language

Not all 13D activist activity involves large firms or public battles. Several Q1 filings made pointed claims about management performance and board accountability at smaller companies:

• Pacira BioSciences (PCRX) — Doma Perpetual Capital Management, holding 7.3%, nominated three directors in March and called on the board to replace CEO Frank Lee immediately. Doma cited a 76% stock decline over the prior decade and called the company's executive compensation "exorbitant and unmerited." Pacira responded that it had met with Doma 12 times and that the fund's suggestions didn't go beyond what management was already evaluating.
• Distribution Solutions Group (DSGR) — LKCM Headwater Investments, which already controls 78.7% of the company, submitted a non-binding proposal on March 14 to acquire the remaining shares at $29.50, in a roughly $2 billion go-private transaction. The rationale: reduced SEC reporting burdens and greater operational flexibility. The board said it would review the proposal.
• Mawson Infrastructure Group (MIGI) — Endeavor Blockchain, holding approximately 46% of shares, filed a consent solicitation on March 16 seeking to remove the entire three-person board. Endeavor cited a near-95% decline in market capitalization since 2021, from roughly $450 million to about $15 million. Mawson responded by adopting a shareholder rights plan.

What the filings show about intent

One pattern across Q1: a number of positions that were originally reported on the shorter Schedule 13G — the passive investor form — were converted to 13D filings, signaling a shift from observation to engagement. Veradace Capital Management, which had filed a 13G on SoundThinking Inc. (SSTI) in January, converted to a 13D in March after what it described as a "concerning" meeting with management, noting several years of underperformance. The change in form type is a public signal of escalating intent, even before any specific demands are announced.

The 13D data shows where large shareholders are asking for change — and where boards are agreeing to it, fighting it, or being replaced entirely. The filings cover a wide range of tactics, from standstill agreements and board seats to tender offers, consent solicitations, and full buyouts. How each situation resolves tends to be specific to the company and the people involved, but the filings themselves make the opening positions visible.

All data referenced here is drawn from Schedule 13D and Schedule 13D/A filings submitted to the SEC through March 27, 2026. Every filing covers issuers and filers for which the beneficial owner holds 5% or more of the relevant class of equity securities. Company-level detail and ownership history are available through FilingFrog's security pages, and recent changes can be tracked through the changes section.