Waters (WAT) insider buying and selling
Every Table I transaction reported by directors and officers of S&P 500 companies on SEC Form 4 filings (2 business days to file): each row labeled with its official transaction code, nothing filtered out beforehand.
Open-market purchases (code P) are the rare signal, in green; sales (code S) are common and often pre-scheduled (10b5-1). Table II (derivatives) is not included: its prices are exercise prices, not market values. Guide: insider buying.
| Date | Ticker | Insider | Role | Shares | Price | Amount | % of stake | Type / filing |
|---|
Download these transactions as CSV No account, no sign-up. The data is public: it comes from SEC Form 4 filings.
Waters Corporation (WAT) insider buying and selling: 2 purchases, 1 sale
52 Form 4 Table I transactions filed with the SEC by Waters Corporation insiders between 2025-10-02 and 2026-10-02 (15-month history): 2 open-market purchases and 1 sale, plus 49 transactions under other Form 4 codes, broken down one by one below. The largest open-market trade is a sale of $1.4M by Kuebler Christopher A on 2026-08-06.
Waters insider buying and selling over the last 12 months
Between Oct 21, 2025 and Oct 20, 2026, Waters insiders filed 2 purchases worth $451k and 1 sale worth $1.4M on the open market. The net balance is on the sell side: $992k more sold than bought.
The biggest buyer was Fearon Richard H (Director): $306k in 1 purchase, out of 2 different buyers. The biggest seller was Kuebler Christopher A (Director): $1.4M in 1 sale, the only seller.
The largest trade of the period was a sale of $1.4M on Aug 6, 2026, by Kuebler Christopher A (Director). Form 4 on sec.gov (0001000697-26-000127).
The only sale does not carry the 10b5-1 plan flag on the Form 4 (sales scheduled months ahead).
The last three months show 0 purchases and 1 sale, against 0 and 0 in the three before. The latest purchase is from Mar 16, 2026; the latest sale from Aug 6, 2026.
Against its sector (Healthcare, 59 companies with an insider page on this site), over the same dates the median is 9 sales and 0 purchases on the open market. Waters has more sales than 5 of the other 58, ranks 48 of 59 by net dollars sold, and 19 of the 59 have at least one purchase, Waters included.
The 20 most important trades
The 2 open-market purchases first, then the rest, each type from largest to smallest. The full history is in the tool above, already searched.
See all 52 WAT trades in the full history →
| Trade date | Filed | Insider | Role | Amount | Code | Filing |
|---|---|---|---|---|---|---|
| 2026-03-06 | 2026-03-10 | Fearon Richard H | Director | $306k | P — Open-market purchaseForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $305.84 to $306.49 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote. | SEC |
| 2026-03-16 | 2026-03-18 | Jiang Wei | Director | $145k | P — Open-market purchase | SEC |
| 2026-08-06 | 2026-08-07 | Kuebler Christopher A | Director | $1.4M | S — Open-market sale | SEC |
| 2026-03-02 | 2026-03-03 | Batra Udit | President and CEO | $1.0M | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF1 Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported performance stock units. | SEC |
| 2026-08-06 | 2026-08-07 | Kuebler Christopher A | Director | $495k | M — Option exercise | SEC |
| 2025-11-05 | 2025-11-07 | Kuebler Christopher A | Director | $490k | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF1 The reported transaction is not a sale but represents the withholding of shares by the Issuer to cover payment of the exercise price in connection with the reported exercise of a stock option by the Reporting Person prior to the expiration of such stock option. | SEC |
| 2025-11-05 | 2025-11-07 | Kuebler Christopher A | Director | $490k | M — Option exercise | SEC |
| 2026-03-02 | 2026-03-03 | Chaubal Amol | SVP & Chief Financial Officer | $218k | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF1 Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported performance stock units. | SEC |
| 2026-03-02 | 2026-03-03 | Bennett Jianqing | SVP Waters Adv. Diagnostics | $126k | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF1 Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported performance stock units. | SEC |
| 2026-04-06 | 2026-04-07 | Bennett Jianqing | SVP Waters Adv. Diagnostics | $92k | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF1 Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units. | SEC |
| 2026-05-12 | 2026-05-14 | Chaubal Amol | SVP & Chief Financial Officer | $84k | F — Tax withholding (shares surrendered for taxes)2 Form 4 footnotesF1 Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units. F2 Includes 65.4519 shares of common stock acquired on March 31, 2026, pursuant to the Waters Corporation Amended and Restated 2009 Employee Stock Purchase Plan, in a transaction that was exempt pursuant to Rule 16b-3(c). | SEC |
| 2026-02-05 | 2026-02-06 | Batra Udit | President and CEO | $82k | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF2 Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units. | SEC |
| 2026-06-24 | 2026-06-25 | Carpio Robert L Iii | SVP Waters Analytical Sciences | $70k | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF1 Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units. | SEC |
| 2026-02-05 | 2026-02-06 | Chaubal Amol | SVP & Chief Financial Officer | $22k | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF2 Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units. | SEC |
| 2026-02-05 | 2026-02-06 | Bennett Jianqing | SVP TA Instruments Division | $16k | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF2 Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units. | SEC |
| 2026-02-05 | 2026-02-06 | Carpio Robert L Iii | SVP, Waters Division | $14k | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF1 Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units. | SEC |
| 2026-09-30 | 2026-10-02 | Jiang Wei | Director | A — Grant or awardForm 4 footnoteF1 Represents common stock units received in lieu of cash payment of director fees pursuant to the Issuer's 1996 Non-Employee Director Deferred Compensation Plan. Common stock units are convertible into shares of the Issuer's common stock on a one-for-one basis upon distribution, which will occur automatically upon the Reporting Person's termination of service as a member of the Issuer's Board of Directors. | SEC | |
| 2026-09-30 | 2026-10-02 | Knight Heather | Director | A — Grant or awardForm 4 footnoteF1 Represents common stock units received in lieu of cash payment of director fees pursuant to the Issuer's 1996 Non-Employee Director Deferred Compensation Plan. Common stock units are convertible into shares of the Issuer's common stock on a one-for-one basis upon distribution, which will occur on January 1, 2027, pursuant to an election previously made by the Reporting Person. | SEC | |
| 2026-06-30 | 2026-07-02 | Jiang Wei | Director | A — Grant or awardForm 4 footnoteF1 Represents common stock units received in lieu of cash payment of director fees pursuant to the Issuer's 1996 Non-Employee Director Deferred Compensation Plan. Common stock units are convertible into shares of the Issuer's common stock on a one-for-one basis upon distribution, which will occur automatically upon the Reporting Person's termination of service as a member of the Issuer's Board of Directors. | SEC | |
| 2026-06-30 | 2026-07-02 | Knight Heather | Director | A — Grant or awardForm 4 footnoteF1 Represents common stock units received in lieu of cash payment of director fees pursuant to the Issuer's 1996 Non-Employee Director Deferred Compensation Plan. Common stock units are convertible into shares of the Issuer's common stock on a one-for-one basis upon distribution, which will occur on January 1, 2027, pursuant to an election previously made by the Reporting Person. | SEC |
The period balance: money in, money out
Across the Form 4 filings submitted between Oct 2, 2025 and Oct 2, 2026, Waters Corporation open-market activity adds up to 2 purchases worth $451k and 1 sale worth $1.4M. The net balance is $992k on the sell side.
Only codes P and S count, where an insider puts in or takes out their own money. A selling balance like Waters Corporation's is the norm in the S&P 500, where much of the pay comes as stock. It is not a recommendation to buy or sell: it is what was filed.
Every transaction, code by code
| Code | What it means | Trades | Reported amount |
|---|---|---|---|
| A | Grant or award | 36 | $0 |
| F | Tax withholding (shares surrendered for taxes) | 11 | $2.3M |
| M | Option exercise | 2 | $985k |
| P | Open-market purchase | 2 | $451k |
| S | Open-market sale | 1 | $1.4M |
| Total | Everything filed in the period | 52 | $5.1M |
36 of the 52 rows carry no usable amount on the Form 4: they count as trades and add $0. The code labels come from the SEC index.
Who has traded
Over the 15 months of history, 14 distinct people or entities have filed Waters Corporation transactions: 2 bought on the open market and 1 sold. Counted by CIK, the fixed number the SEC gives each filer, and not by name, which each filer types their own way.
| Filer | Role | Transactions | Bought (count) | Sold (count) | Last filed |
|---|---|---|---|---|---|
| Kuebler Christopher A | Director | 6 | — | $1.4M (1) | 2026-08-07 |
| Fearon Richard H | Director | 3 | $306k (1) | — | 2026-03-10 |
| Jiang Wei | Director | 8 | $145k (1) | — | 2026-10-02 |
| Knight Heather | Director | 7 | — | — | 2026-10-02 |
| Bennett Jianqing | SVP Waters Adv. Diagnostics | 5 | — | — | 2026-04-07 |
| Chaubal Amol | SVP & Chief Financial Officer | 5 | — | — | 2026-05-14 |
| Batra Udit | President and CEO | 4 | — | — | 2026-03-03 |
| Carpio Robert L Iii | SVP Waters Analytical Sciences | 3 | — | — | 2026-06-25 |
Shown here are the 8 who moved the most money, out of 14. The rest are in the full history, one link above. The name links to all their trades, in any company. "Transactions" counts any code; the money, open market only. Role: from their latest filing.
Month by month
By the month the trade was executed, not the month it was filed; months with no trades show zero. The busiest month was Mar 2026: 2 purchases and 0 sales, worth $451k. 13 of the 15 months have none.
| Month | Purchases | Amount | Sales | Amount |
|---|---|---|---|---|
| Aug 2025 | 0 | $0 | 0 | $0 |
| Sep 2025 | 0 | $0 | 0 | $0 |
| Oct 2025 | 0 | $0 | 0 | $0 |
| Nov 2025 | 0 | $0 | 0 | $0 |
| Dec 2025 | 0 | $0 | 0 | $0 |
| Jan 2026 | 0 | $0 | 0 | $0 |
| Feb 2026 | 0 | $0 | 0 | $0 |
| Mar 2026 | 2 | $451k | 0 | $0 |
| Apr 2026 | 0 | $0 | 0 | $0 |
| May 2026 | 0 | $0 | 0 | $0 |
| Jun 2026 | 0 | $0 | 0 | $0 |
| Jul 2026 | 0 | $0 | 0 | $0 |
| Aug 2026 | 0 | $0 | 1 | $1.4M |
| Sep 2026 | 0 | $0 | 0 | $0 |
| Oct 2026 | 0 | $0 | 0 | $0 |
The last month may be partial: a Form 4 is filed up to two business days later. The table does not say whether the pattern is good or bad; it says when it happened.
Waters Corporation (WAT) analysis page →
Other Healthcare companies with insider trades
All 500 are listed in the section index →
Which insiders are buying their own company stock →
How to read this data
None of the 1 sale in the table is flagged as scheduled (10b5-1 plan), the kind signed months ahead and executed automatically. Waters's 2 open-market purchases (code P) are the rare signal: insiders are already paid in stock, so buying more means putting in their own money. The latest filing is from Oct 2, 2026, and a Form 4 arrives up to two business days after the trade.
16 of the 20 rows in the table carry footnotes from the Form 4 itself, folded into the code column and copied verbatim; a row with no footnote means the filing has none.
Guide: Insider buying · all guides
What is behind these trades
The concepts on this page, explained from scratch in the Academy. Free, no account.
- What the efficiency hypothesis says and what it does NOT sayIf an insider's purchase is public and anyone can read it, is there any information left in it? That is the exact question that brings people here.
- Who really moves the market: the types of investorWho sits on the other side of each order, and where a company's own insiders fit among them.
- Supply, demand and price: why it rises and falls constantlyHow a piece of news ends up inside the price, and why the reaction to a filed sale is rarely the one you would expect.
Source: SEC EDGAR Form 4. This is a list of public facts, not financial advice or a recommendation to buy or sell.