Top Whale Tickers in Early October 2026: Kodiak Buys, CrowdStrike Sales, and a Busy PKOH Board

Top whale tickers in early October 2026 are no longer a one-story sell board. As of October 6, 2026, ProBors still shows heavy exit flow on liquid cybersecurity names—CRWD (CrowdStrike) with about $231 million in net reported whale value over 14 days—but KOD (Kodiak Sciences) and ADRX (ADARx Pharmaceuticals) now rank in the top tier on open-market purchases and conversion-related buys, not just on sale frequency. PKOH (Park Ohio Holdings) leads the 14-day print-count leaderboard at 189 whale-class rows, while CBRS (Cerebras Systems) and UTHR (United Therapeutics) keep large-dollar sale pressure. This guide maps the early-October leaderboard, a five-step triage framework for mixed buy/sell boards, recent large Form 4 filings worth a second look, and what leaderboard volume does not prove. It is research context, not investment advice.

Why the early-October whale board looks different from late September

Whale leaderboards rank large Form 4 prints by frequency and reported value—they are not sentiment scores. Three shifts stand out compared to the board as of late September:

• Buy-side clusters broke into the top fifteen. KOD shows 88 whale-class prints with about +$161 million in net reported value (82 buys, zero sales in the buy/sell split). ADRX shows 92 prints and about +$84.9 million net reported, driven by conversion and purchase activity rather than open-market sales. Late-September commentary focused almost entirely on DELL, CRWD, and SNOW sales.
• CrowdStrike still dominates dollars on the sell side. CRWD carries 97 prints and about −$231 million in net reported value over 14 days—still ahead of most sale-heavy names even as DELL print count in the rolling window fell out of the top-ten frequency list ( DELL remains first on the 30-day board at 635 prints and about −$468 million net reported).
• Print-count leaders are not always dollar leaders. PKOH tops the 14-day frequency table at 189 prints but only about −$2.1 million in net reported value—many smaller code S lines rather than a single mega-sale headline.

The research task in October is the same as in September: decide which tickers deserve a footnote read, not whether the board is “bullish” or “bearish.”

14-day whale leaderboard (as of October 6, 2026)

The table below reflects ProBors whale activity over the last 14 days as of October 6, 2026. Print counts include large Form 4 rows indexed in the platform; net reported value sums directionally (sales show as negative).

Over 30 days, DELL still dominates print count (635 rows, 557 sales, about −$467.9 million in net reported value), followed by UTHR (260 prints, about −$65.4 million) and CRWD (249 prints, about −$341.1 million). The 30-day view confirms that cybersecurity and fund-distribution stories are sustained—not a single-week artifact.

Note on mixed codes: Tickers like CACI, MTN, and GBTG can show large net values with low code S counts in the buy/sell split because dispositions, conversions, and other Form 4 codes also flow through whale feeds. Open the underlying filing before treating a rank as a directional signal.

A five-step triage framework when buys and sells share the board

Use the same checklist when KOD and CRWD both rank highly so compensation grants and fund distributions do not masquerade as discretionary flow.

1. Confirm the SEC transaction code

Open-market sales use code S; open-market purchases use code P. Conversions (C), grants (A), and option exercises (M, X) are different economic events. ProBors shows the code and trade type on each whale row—filter here before reacting to dollar size.

2. Separate fund-holder waves from officer activity

KOD’s buy cluster includes many Baker Bros. Advisors LP code P lines on the same trade dates—classic institutional accumulation split across tranches. CRWD officer code S sales read differently from PKOH’s high print count with modest net dollars.

3. Measure filing lag in calendar days

Form 4 is generally due within two business days after the transaction. A 4-day lag on an October 1 trade filed October 5 is worth a quick footnote check on SEC EDGAR even when the delay is not automatically a red flag.

4. Read signal scores as a sort key—not a verdict

ProBors signal scores weigh size, role, timing, and pattern history. A score of 8 on a derivative sale flags Worth watching attention; a score of 0 on a large CEO open-market purchase can still be economically meaningful if the dollar value is unusual for that filer. Sort by signal after filtering codes. For scoring details, see how ProBors trade signal scores work.

5. Cross-check chart and congressional context

Open the ticker workspace on ProBors: review price reaction since the trade date, any congressional markers, and whether the AI summary flags clinical readouts, earnings, or lock-up events. Whale flow plus politician activity on the same name is a stronger research prompt than either feed alone.

For purchase-cluster patterns specifically, see insider buying clusters: what to look for.

Recent filings worth a second look

The table below shows deduplicated whale rows from ProBors as of October 6, 2026, filed in the first week of October or late September. Values are as reported in the platform; lag is calendar days between trade date and filing date.

How to read this snapshot without overfitting:

• ACCV CEO Rubiera Michael filed multiple code P purchases on October 1, 2026, filed October 5; the table shows the $3.6 million tranche. Read the full Form 4 for financing context on a smaller issuer.
• ASST shows a coordinated officer sale wave filed October 5, 2026, including CEO Cole Matthew Ryan’s $1.8 million code S line alongside other executives—cluster selling, not a single isolated print.
• KOD Baker Bros. purchases filed September 30, 2026, are one slice of the broader 82-buy cluster that pushed KOD to positive net reported value on the 14-day board.
• CRWD Saha Anurag’s October 1 sales filed October 5 are one tranche in a recurring officer sale pattern; the 14-day CRWD total remains near −$231 million net reported.

How to research whale tickers on ProBors

1. Open the Whales tab from the dashboard and sort by filing date (newest first).
2. Click Top tickers and toggle between 14-day and 30-day windows to see whether DELL-style fund flow is aging out of the short window while KOD-style buy clusters persist.
3. Filter by ticker when CRWD, KOD, or CBRS hits your watchlist.
4. Open a row to read transaction code, insider title, signal score, and footnote context.
5. Jump to the Market workspace for the same ticker to overlay price action and congressional markers.
6. Add tickers with recurring whale prints to a watchlist if you want alerts on the next filing—not on live price.

For tab navigation details, see the ProBors Whales tab guide. For the full triage checklist, see how to triage whale transactions on ProBors.

What this whale data does not prove

A mixed buy/sell whale leaderboard does not prove:

• That KOD insiders or Baker Bros. traded on material non-public information
• That CRWD officer sales predict near-term price direction
• Exact post-trade holdings (Form 4 value fields are as reported, not always full position snapshots)
• That every code S row is discretionary—many reflect 10b5-1 plans, tax events, or fund rebalancing
• That positive net reported value on ADRX equals bullish sentiment (conversion codes are not open-market buys)
• That high print count on PKOH implies large economic exposure per insider

Insider flow is often routine. The research value is prioritization: which tickers deserve a footnote read, a chart check, and a second pass against the original SEC filing.

FAQ

What counts as a "whale" transaction on ProBors?

ProBors surfaces large Form 4 filings that meet size thresholds for the Whales feed—typically high-dollar open-market prints and other reportable rows that stand out from routine compensation activity. Use transaction code and reported value together, not size alone.

Why does KOD rank high on net value while CRWD still leads cybersecurity sales?

KOD shows 82 open-market buys (code P) in the 14-day buy/sell split with about +$161 million in net reported value—institutional accumulation in biotech. CRWD shows 95 sales with about −$231 million net reported, driven by officer code S lines. They answer different research questions: cluster buying vs sustained selling.

Why is PKOH first on print count but not on dollars?

PKOH carries 189 whale-class prints in 14 days but only about −$2.1 million in net reported value—many smaller sales rather than a single headline tranche. Frequency and dollars diverge often on industrial names with repetitive insider reporting.

How is early October different from late September on the whale board?

Late September emphasized DELL at 294 prints in the rolling 14-day window and SNOW in the high-dollar tier. Early October shows DELL fading from the 14-day top-ten frequency list (while staying first on the 30-day board), KOD and ADRX in the top tier on buy-side net value, and PKOH leading print count.

Should I buy a stock because it shows insider purchases on the whale board?

No. Purchase clusters deserve footnote reads and clinical or earnings context—especially on biotech names. Verify each row on EDGAR and treat the data as disclosure context. This is research context, not investment advice.

How often does ProBors refresh whale data?

Form 4 ingestion runs on a regular schedule. Check probors.com/status for the latest SEC Form 4 / Whales source health before citing rows in notes or publications.

Track whale flow on ProBors

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Related reading

• Top whale tickers in late September 2026
• Cerebras whale insider sales explained
• Insider buying clusters: what to look for
• How to triage whale transactions on ProBors
• Why insider selling is usually not a signal

Sources

• SEC Form 4 overview — reporting requirements for insiders
• SEC EDGAR search — verify individual Form 4 filings
• SEC investor bulletin: Forms 3, 4, and 5
• Rows were checked in ProBors and should be verified against the original filing.
• Ingestion health: probors.com/status