greeksoup/ stock research

NewAmsterdam Pharma Co. N.V. insider trading

In twelve months insiders at NewAmsterdam Pharma Co. bought $226K and sold $63.3M on the open market; 36 of the 43 sales were under plans set months before.

Bought on the open market$226K1 purchase
Sold on the open market$63.3M43 sales
Sales set in advance36 of 43under Rule 10b5-1 plans
Pay taken in stockNone
New to this? How to read this page
  1. Insiders are the people who run the company: officers, directors and owners of 10% or more. They must report a trade on Form 4 within two business days.
  2. A purchase on the open market is the strongest sign: the insider spent their own money.
  3. A sale under a trading plan (Rule 10b5-1) says little: its dates were fixed months before. Sales outside a plan say more, but insiders sell for many reasons, such as taxes or a house.
  4. Grants, option exercises and shares held back for tax are left out.
  5. What is a Form 4? · Form 4 codes

What kind of trades

1 purchase worth $226K against 43 sales worth $63.3M; 36 of the sales were under plans set months before.

Purchasebought with their own money
Pay in stock, own choiceowed cash, chose shares
Sale outside a planthe insider picked the day
Sale under a plandates fixed months before
Says littlecompany plans, board pay, cash units
Bought
1 open market
Sold
736 under a plan

Every Form 4 line of the last twelve months, counted by kind. The grades come from the filing itself: whether the insider paid cash, whether a plan set the date, whether pay was taken in stock by choice.

Insider trades on the share price

last twelve months

30 marks over twelve months, each in its grade: solid for the stronger signs, hollow or grey for the ones that say little.

PurchasePay in stock, own choiceSale outside a planSale under a planSays little

The blue line is the daily close over twelve months. Each mark is one insider's trades on one day, on that day's price, sized by dollar value. Solid marks are the stronger signs; hollow and grey marks say little. Hover or tap a mark for who, how much and why.

Trades worth a closer look

A purchase stands out when two or more of these hold: a senior insider, several insiders buying within 90 days, a fall of 10% or more in the three months before, or over $1 million. A sale outside a plan is judged the same way. These are the Feed's rules.

Who traded

dollars, twelve months

6 insiders traded. The most: Davidson Michael H., sale outside a plan $14.8M; sale under a plan $10.6M; purchase $226K.

One row per insider, sold to the left and bought to the right, split by grade: the paler part of a bar is the part that says little.

How it compares

every company on the site

Open-market sales, twelve months

Open-market purchases, twelve months

    The bar ranks every company on the site from the lowest on the left to the highest on the right, in three equal thirds; the small figures under it are the values where each third starts, and the black tick is the middle company. The orange dot is this company; the grey ticks are the other companies in its industry (hover or tap for names). A hatched block is companies tied at none.

    Every Form 4 line

    Purchase: bought on the open market with their own moneyTook pay in stock, own choice: owed cash, chose shares instead; a softer signSale: sold on the open market, not under a plan set in advanceSale, trading plan: under a Rule 10b5-1 plan set up months before, so the date was fixed in advanceGrey lines: plan purchases, pay in stock taken by the whole board or under a company plan, and units paid in cash; they say little about the insider's own view
    TradedInsiderRoleTypeSharesPriceValueFiling
    30 September 2026Kastelein Johannes Jacob Pieter, see footnotesChief Scientific OfficerSaletrading plan set in advance · Form 144 notice 24 August 202650,246$25.03$1.3 millionForm 4
    14 September 2026Davidson Michael H.Chief Executive OfficerPurchaseafter a 27% fall over three months · 46% below its one-year high10,000$22.65$226,500Form 4
    4 September 2026Smither John WDirectorSaleafter a 19% fall over three months · 39% below its one-year high1,600$25.32$40,512Form 4
    24 August 2026Kastelein Johannes Jacob Pieter, see footnotesChief Scientific OfficerSaletrading plan set in advance · Form 144 notice 24 August 2026125,000$26.91$3.4 millionForm 4
    20 July 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 26 May 202670,200$29.96$2.1 millionForm 4
    20 July 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 26 May 202631,885$31.05$990,029Form 4
    20 July 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 26 May 20262,915$31.71$92,435Form 4
    22 June 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 26 May 202639,700$30.20$1.2 millionForm 4
    22 June 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 26 May 2026300$30.73$9,219Form 4
    26 May 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 26 May 202665,000$35.69$2.3 millionForm 4
    11 March 2026Lange Louis GDirectorSaleafter a 12% fall over three months · 24% below its one-year high · Form 144 notice 11 March 202644,173$30.41$1.3 millionForm 4
    11 March 2026Lange Louis GDirectorSaleafter a 12% fall over three months · 24% below its one-year high · Form 144 notice 11 March 2026446$31.23$13,929Form 4
    6 March 2026Lange Louis G, see footnoteDirectorSaleafter a 15% fall over three months · 28% below its one-year high · Form 144 notice 6 March 202628,186$29.41$828,950Form 4
    9 March 2026Kastelein Johannes Jacob Pieter, see footnoteChief Scientific OfficerSaletrading plan set in advance · Form 144 notice 5 March 2026101,409$30.29$3.1 millionForm 4
    6 March 2026Kastelein Johannes Jacob Pieter, see footnoteChief Scientific OfficerSaletrading plan set in advance · Form 144 notice 5 March 202694,124$30.32$2.9 millionForm 4
    5 March 2026Kastelein Johannes Jacob Pieter, see footnoteChief Scientific OfficerSaletrading plan set in advance · Form 144 notice 5 March 2026104,467$30.30$3.2 millionForm 4
    2 March 2026Davidson Michael H.Chief Executive OfficerSaleafter a 17% fall over three months · 21% below its one-year high · Form 144 notice 2 March 2026443,707$33.25$14.8 millionForm 4
    26 February 2026Davidson Michael H.Chief Executive OfficerSaletrading plan set in advance · Form 144 notice 24 February 2026165,408$33.63$5.6 millionForm 4
    26 February 2026Davidson Michael H.Chief Executive OfficerSaletrading plan set in advance · Form 144 notice 24 February 202617,924$34.44$617,303Form 4
    25 February 2026Davidson Michael H.Chief Executive OfficerSaletrading plan set in advance · Form 144 notice 24 February 202646,517$35.11$1.6 millionForm 4
    25 February 2026Davidson Michael H.Chief Executive OfficerSaletrading plan set in advance · Form 144 notice 24 February 202610,436$35.96$375,279Form 4
    25 February 2026Davidson Michael H.Chief Executive OfficerSaletrading plan set in advance · Form 144 notice 24 February 20261,300$36.68$47,684Form 4
    24 February 2026Davidson Michael H.Chief Executive OfficerSaletrading plan set in advance · Form 144 notice 24 February 202661,547$36.13$2.2 millionForm 4
    24 February 2026Davidson Michael H.Chief Executive OfficerSaletrading plan set in advance · Form 144 notice 24 February 20263,161$36.46$115,250Form 4
    20 February 2026Kastelein Johannes Jacob PieterChief Scientific OfficerSaleafter a 7% fall over three months · 14% below its one-year high · Form 144 notice 20 February 202614,692$35.00$514,220Form 4
    20 February 2026Kastelein Johannes Jacob PieterChief Scientific OfficerSaleafter a 7% fall over three months · 14% below its one-year high · Form 144 notice 20 February 202630,789$35.46$1.1 millionForm 4
    28 January 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 5 January 202632,612$31.80$1.0 millionForm 4
    27 January 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 5 January 202639,816$32.62$1.3 millionForm 4
    26 January 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 5 January 202634,091$32.77$1.1 millionForm 4
    26 January 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 5 January 2026309$33.45$10,336Form 4
    23 January 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 5 January 202625,405$33.44$849,543Form 4
    23 January 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 5 January 202612,767$34.37$438,802Form 4
    21 January 2026Somaiya Mayur IanChief Financial OfficerSaletrading plan set in advance · Form 144 notice 20 January 202615,422$33.25$512,782Form 4
    21 January 2026Somaiya Mayur IanChief Financial OfficerSaletrading plan set in advance · Form 144 notice 20 January 202624,362$33.80$823,436Form 4
    20 January 2026Somaiya Mayur IanChief Financial OfficerSaletrading plan set in advance · Form 144 notice 20 January 2026900$30.64$27,576Form 4
    20 January 2026Somaiya Mayur IanChief Financial OfficerSaletrading plan set in advance · Form 144 notice 20 January 202639,712$31.78$1.3 millionForm 4
    20 January 2026Somaiya Mayur IanChief Financial OfficerSaletrading plan set in advance · Form 144 notice 20 January 202619,604$32.38$634,778Form 4
    7 January 2026Davidson Michael H.Chief Executive OfficerSaletrading plan set in advance · Form 144 notice 7 January 202611,582$0.00$0Form 4
    5 January 2026Kastelein Johannes Jacob PieterChief Scientific OfficerSaletrading plan set in advance · Form 144 notice 5 January 20266,000$33.25$199,500Form 4
    5 January 2026Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 5 January 20262,647$33.25$88,013Form 4
    5 January 2026Somaiya Mayur IanChief Financial OfficerSaletrading plan set in advance · Form 144 notice 5 January 20265,118$33.25$170,174Form 4
    26 December 2025Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 23 December 202543,872$35.30$1.5 millionForm 4
    24 December 2025Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 23 December 202526,011$35.68$928,072Form 4
    23 December 2025Kooij Louise FrederikaChief Accounting OfficerSaletrading plan set in advance · Form 144 notice 23 December 202575,117$36.21$2.7 millionForm 4
    A filing with several lines appears once per line.
    Read morePay taken in stock by the insider's own choice has the filing's footnote, word for word, in the note under it; for the others, hold the pointer on the type. An award filed at no price shows n/a.