Options Trading Before Merger Announcements: The Insider Signal

When a public company gets acquired at a premium, shareholders celebrate. But some people already knew. The tell isn’t always a suspicious Form 4 or a cluster of insider purchases—sometimes it shows up in the options market days before the press release, in the form of short-dated, out-of-the-money call options on the target company.

Options trading before merger announcementsis one of the most studied and prosecuted forms of informed trading in U.S. markets. The reason is arithmetic: options amplify a position’s return dramatically compared to buying stock outright, converting a 48% stock move into a 500% options return. That math makes options the weapon of choice for anyone who knows a deal is coming.

This post walks through the mechanics of why that happens, what the academic research has documented across nearly 1,900 deals, how FINRA and the SEC detect it, and what three 2026 enforcement cases reveal about the pattern in practice.

Why Insiders Reach for Options First

The core logic is leverage. When someone with material nonpublic information about an upcoming acquisition wants to profit, they face a choice: buy the target company’s stock, or buy call options on it. The options route is almost always more attractive on a risk-adjusted basis—assuming you know the deal is happening.

Consider the PetIQ case charged by the SEC on March 31, 2026. When the Bansk Group’s $1.5 billion acquisition was announced on August 7, 2024, PetIQ stock rose 48%. Michael Smith, the company’s President and COO, had tipped his friend Douglas Dalton about the deal. Smith chose to buy stock through his ex-wife’s brokerage accounts; Dalton chose to buy call options. Smith netted $145,772. Dalton put in $19,985 and walked away with $96,515—a return of nearly 500% on the same 48% stock move.

This is why informed traders prefer options. On a stock position, your return is roughly proportional to the price move. On an options position, you benefit from leverage: a small premium payment controls a large notional value. If you’re confident a 40–50% stock move is coming, a short-dated call option transforms that into a several-hundred-percent return. The trade-off—the option expires worthless if the deal doesn’t happen—is irrelevant if you already know it will.

Options also offer a degree of deniability that stock purchases don’t. An insider who buys stock directly must report it on Form 4 within two business days. Exchange-listed options purchased outside of equity compensation plans don’t appear on Form 4 at all. That gap, as we’ll discuss later, is real—and it’s one reason surveillance systems exist.

The OTM Call Fingerprint: What Informed Trading Looks Like

Academic researchers have characterized the informed-trading pattern with considerable precision. A 2019 study by Augustin, Brenner, and Subrahmanyam in Management Science examined 1,859 U.S. takeovers between 1996 and 2012. Their finding: roughly 25% of those deals showed statistically abnormal options volume in the days before the announcement.

The abnormal activity wasn’t random or diffuse. It was concentrated in a very specific pattern:

Short-dated, out-of-the-money calls are the instrument of choice because they offer the highest leverage. If the stock sits at $30 and a call with a $35 strike expires in two weeks, that option costs very little — but if an acquisition premium pushes the stock to $45, the same option is now deep in the money and worth multiples of what was paid.

Importantly, the researchers checked every alternative explanation: market rumors, corporate insider stock purchases, deal predictability, activist investor filings. Over half of the abnormal options activity couldn’t be explained by any of these factors. The implied probability of the volume spikes occurring on a random day: roughly three in a trillion.

The Enforcement Gap: Why Only 8% of Suspicious Deals Get Litigated

Here’s the uncomfortable reality the same Augustin-Brenner-Subrahmanyam study surfaces: while 25% of the takeovers in their sample showed this detectable pattern of abnormal options activity, the SEC litigated only about 8% of all dealsin the study period. The characteristics of the abnormal trades closely resemble those in SEC-prosecuted insider trading cases — but most of the activity never becomes a case.

The gap exists for structural reasons, not because the SEC isn’t watching. Proving insider trading requires establishing who had the information, who traded on it, and that a duty was breached — evidence chains that can be impossible to reconstruct years after the fact, especially when traders use nominees, offshore accounts, or encrypted communications. Detection is not prosecution.

FINRA’s Surveillance Layer: 100% of the Market, 450+ Referrals a Year

The first line of detection sits at FINRA, which monitors 100% of U.S. trading in stocks, options, and bonds for suspicious activity around material news events. FINRA’s Insider Trading Detection Program runs SONAR, a cross-market surveillance system that scans for abnormal activity relative to baseline volumes, sector norms, and pre-announcement windows.

The scale of the operation: approximately 65 staff members dedicated exclusively to insider trading cases. Investigations typically run six to eight months. Referral documents to the SEC range from 10 to 30 pages and include trader background profiles, social media analytics, and geographic proximity data — mapping where the trader lives relative to where the tipping conversation likely happened.

In 2023 alone, FINRA generated more than 450 referrals to the SEC and other law enforcement agencies. And the deterrent effect kicks in before a case is filed: Tyler Loudon, who generated $1.7 million in illegal profits trading TravelCenters stock ahead of BP’s acquisition announcement (the stock surged over 70%), confessed after learning FINRA had opened an inquiry. He hadn’t been charged yet — the investigation itself was enough to surface the disclosure.

The SEC’s Second Layer: MIDAS, Blue Sheets, and the CAT

When a FINRA referral lands at the SEC, the agency has its own analytical infrastructure to build the case. MIDAS (Market Information Data Analytics System) processes approximately one billion records daily from the proprietary feeds of all 13 national equity exchanges, with timestamps down to the microsecond. Options trading before announcements is specifically flagged as high-priority because of the leverage involved: buying out-of-the-money calls just before positive news is statistically improbable — and statistical improbability is itself evidentiary.

Blue sheets — detailed trading records pulled from broker-dealers — let investigators identify the specific accounts behind suspicious orders. The Consolidated Audit Trail (CAT) goes further, providing the full lifecycle of an order across every venue, in near real time. According to FINRA’s own account of the system, CAT has enabled the detection of suspicious trades “in an incredibly expedited manner” that wouldn’t have been possible before the system’s implementation.

The practical result of this layered infrastructure: an options trade placed today in a company that gets acquired next week generates a data trail across multiple systems that investigators can reconstruct with precision. The question isn’t usually whether the trade will be flagged. It’s whether investigators can establish the information chain behind it.

Three 2026 Cases That Show the Pattern in Action

Abstract statistics become clearer through concrete examples. Three cases from 2026 illustrate each element of the options-before-M&A pattern.

The SEC brought 31 insider trading cases in FY2025, a figure consistent with recent years, and nearly 90% of standalone enforcement actions since January 2025 have charged at least one individual. Insider trading remains an enforcement priority, not a fading concern.

What the Form 4 Record Does (and Doesn’t) Show

There’s an important gap in what the public record captures. Form 4 filings cover equity securities transactions by Section 16 insiders — direct stock purchases, sales, RSU vestings, option exercises under compensation plans. Exchange-listed call options purchased independently by an insider or tippee don’t appear on Form 4.

In the Canoo case, Jai Sondhi wasn’t a Section 16 insider (a director, officer, or 10% owner), so no Form 4 obligation applied to him at all. In the PetIQ case, Dalton’s options trades wouldn’t have shown up on EDGAR even if he had been an insider, because exchange-listed options acquired outside of compensation plans fall outside the Form 4 reporting framework.

This is why surveillance systems like FINRA’s SONAR and the SEC’s MIDAS exist separately from the Form 4 disclosure regime. Form 4 is a disclosure tool for legal insider trading. Options surveillance is designed to catch informed trading that doesn’t leave a Form 4 trail.

When executives do exercise and subsequently sell options granted under compensation plans, those transactions appear on Form 4 under the “M” and “S” transaction codes. But that’s a different instrument from the short-dated OTM calls purchased speculatively ahead of a deal. The two should not be confused.

How to Read Unusual Options Activity Without Getting Fooled

Not every spike in options volume is an informed-trading signal. Options markets are large, liquid, and constantly active for reasons that have nothing to do with insider knowledge: portfolio hedging, covered-call writing, institutional delta-hedging, and speculative positioning around earnings all generate substantial volume.

The filters that matter — the same ones FINRA’s analysts apply and that the SEC’s MIDAS uses to distinguish suspicious from ordinary — look like this:

The strongest signal combines all five: directional call buying, out-of-the-money strikes, short expiry, volume-to-open-interest ratios that indicate fresh positioning, and clustering in the days before a material event. Any one of these in isolation is unremarkable. All five together is the pattern the Augustin-Brenner-Subrahmanyam study documented across nearly 1,900 deals.

One more caution: unusual options activity is a retrospective signal as much as a prospective one. You typically don’t know that the volume spike was suspicious until the deal announcement makes the context clear. Retail investors who act on unusual options activity before an announcement are also trading ahead of public information — they’re not insider trading (they don’t possess MNPI themselves), but they’re following a signal that was often generated by someone who did.