Amsterdamsche Droogdok Maatschappij (ADM) was a Dutch company that repaired ships using dry docks in Amsterdam, Netherlands.

The first of these, Amsterdam Wooden Drydock I can be considered to have been the first modern floating dry dock in Europe.

Its goal was to operate a regular service to the Dutch East Indies with steamships via the Suez Canal.

[1] When the opening of the North Sea Canal became imminent, the board of SMN asked its shareholders for permission to participate in a company to establish a suitable dry dock in Amsterdam.

They first had engineers design a plan for a dry dock that could receive the biggest ship that could pass the North Sea lock of the canal.

They then asked the municipality for a place to station the dry dock and to build a repair shipyard.

Others had smaller holdings, amongst them the people who took the initiative to found ADM. SMN would have priority use of the dry docks that the company would manage, but would not pay a lower price.

The properties committee of the Amsterdam Municipality then proposed a terrain south of the Petroleum storage for a relatively low price.

[10] In October the committee offered another terrain to ADM. ADM could buy 120 ares of land just east of the start of the Noordhollandsch Kanaal, on the north side of the IJ Bay.

[9] The city government then proposed to offer the lands to ADM for 72,000 in a municipal council meeting on 7 November.

This started a discussion in which some argued that if Amsterdam wanted to subsidize ADM in order to attract SMN, this should be done by other means, because the lower price would depreciate all grounds in the surroundings.

[15] Union constructed the dry dock on site, for the better part with her own employees brought from Germany.

[16] After many parts had been built and launched separately, the dry dock was assembled, and opened by King William III on 26 April 1878.

[28] On 17 October 1884 ADM then bought NMSD, the dry dock company of Von Lindern.

[29] In November 1884 ADM asked the municipality of Amsterdam to buy grounds south of Koninginnedok in order to place a second dry dock.

[32] Meanwhile the small competitor Reederij der Drijvende Droogdokken demolished its Amsterdam Wooden Drydock II in the Westerdok in 1890, and went downhill till it sold its remaining dry docks in 1902.

The board of ADM was then authorized by the shareholders to raise a loan for a new, larger dry dock.

[37] In January 1910 an extraordinary meeting of shareholders authorized the board of ADM to emit bonds for up to 700,000 guilders in order to build yet another floating dry dock.

By 1920 ADM was reserving money to build a fifth dry dock, which was ordered at NSM on 1 August 1921.

The depression of 1920–1921 hit the Dutch industry somewhat later, but in 1922 ADM fired all loose laborers, and cut wages by 6%.

In December 1932 there was a notable job for ADM, when Prins Hendrikdok lifted the wreck of MS Pieter Corneliszoon Hooft in order to close all leaks.

Only 237 ships of 629,974 tons visited the dry docks, and the company made a loss before depreciation.

In August 1938 ADM sold Julianadok to a company from the Free City of Danzig, whence it was quickly towed.

[58] Later, it proved that several dry docks were relatively undamaged, but Prins Hendrikdok had been utterly ruined by blowing it up with a ship inside.

The first years after World War II saw a lot of attention to resurfacing and repairing Prins Hendrikdok.

In 1950 the repaired Prins Hendrikdok was almost continuously occupied, and so ADM returned to paying high dividends.

In 1967 business was again good, but productivity did not grow fast enough in respect to increased wages, and so profits decreased.

[65] By March 1978, the merger of the repair activities of both companies, and the end of shipbuilding at NDSM was government policy.

After bankruptcy had been declared, a small company called ADM Naval Services (ANS) was founded.

In July 2018 the Council of State judged the presence of the squatters illegal, and the last of them was evicted by force in January 2019.