WAT Congressional Stock Trades & Insider Buying (2026)

WAT insider buying and selling over the past year

Every open-market Form 4 transaction filed for WATERS CORP /DE/ in the past year was a purchase: 2 buys worth $451.1K in total, and no open-market sales.

Activity clustered in 2026-03 (2 trades); the latest filing in this window is dated 2026-03-16. The single largest trade was a purchase of 1,000 shares worth $306.3K on 2026-03-06. Since the most recent filing the stock has moved +50.7%, from $290.02. Insiders paid an average of $300.71 per share for their open-market purchases; against the last close of $436.95 that cost basis is sitting on a gain at +45.3%.

Where WAT trades relative to its one-year range

WATERS CORP /DE/ closed at $436.95 on 2026-10-16, inside a one-year range of $283.32 to $444.15. That puts the stock near the top of its range, at 95.5% of the distance from low to high. Over one year the share price moved +30.5%, and over roughly three months +18.4%. Average daily volume over the last month was about 867,822 shares.

Across 83 companies in the same SEC industry group (SIC 38) with a full year of prices in Gemral Edge, the median one-year return was +13.2%. WAT is ahead of that median and beat 72% of that peer group on this measure.

Members of Congress who traded WAT

STOCK Act disclosures show 29 trades in WAT by 9 members of Congress over five years (15 purchases, 12 sales), most recently on 2026-08-13. The most active traders were Ro Khanna (D-CA), 11 trades; Gilbert Ray Cisneros, Jr. (D-CA), 5 trades; Julia Letlow (R-LA), 3 trades; Kevin Hern (R-OK), 2 trades; Lisa C. McClain (R-MI), 2 trades.

By party the trades split 17 by Democrats, 12 by Republicans; by chamber, 28 from the House, 1 from the Senate.

Compare WAT with indexed peers from the same industry group

These peers have full Gemral Edge dossiers and the closest one-year price move to WAT:

• DXCM one-year return +29.7%
• BDX one-year return +31.6%
• TMO one-year return +28.5%
• AME one-year return +34.5%
• A one-year return +22.6%

Sources and method

Every figure above is computed from public filings stored in Gemral Edge, not estimated. Insider figures count only open-market purchases and sales reported on SEC Form 4; option exercises, grants and gifts are excluded because they do not reflect a decision to buy or sell at market prices.

• SEC EDGAR Form 4 (edge_insider_trades, codes P/S open-market only) — as of 2026-03-16
• edge_prices_eod (end-of-day close) — as of 2026-10-16
• House PTR / Senate eFD disclosures (edge_congress_trades) — as of 2026-08-13

WAT data questions

Are WAT insiders buying or selling stock?

Every open-market Form 4 transaction filed for WATERS CORP /DE/ in the past year was a purchase: 2 buys worth $451.1K in total, and no open-market sales.

What is the one-year price range for WAT?

Based on end-of-day closes through 2026-10-16, WAT traded between $283.32 and $444.15, last closing at $436.95.

Has any member of Congress traded WAT stock?

Yes. 9 members disclosed 29 trades in WAT over five years; the most recent disclosed trade date is 2026-08-13.