    <SEC-DOCUMENT>0001193125-25-081612-index.html : 20250415
    <SEC-HEADER>0001193125-25-081612.hdr.sgml : 20250415
    <ACCEPTANCE-DATETIME>20250415171539
    ACCESSION NUMBER:		0001193125-25-081612
    CONFORMED SUBMISSION TYPE:	PRE 14A
    PUBLIC DOCUMENT COUNT:		68
    CONFORMED PERIOD OF REPORT:	20250611
    FILED AS OF DATE:		20250415
    DATE AS OF CHANGE:		20250415

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BERKLEY W R CORP
    		CENTRAL INDEX KEY:			0000011544
    		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
    		ORGANIZATION NAME:           	02 Finance
    		EIN:				221867895
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		PRE 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-15202
    		FILM NUMBER:		25840543

    	BUSINESS ADDRESS:
    		STREET 1:		475 STEAMBOAT ROAD
    		STREET 2:		.
    		CITY:			GREENWICH
    		STATE:			CT
    		ZIP:			06830
    		BUSINESS PHONE:		2036293000

    	MAIL ADDRESS:
    		STREET 1:		475 STEAMBOAT ROAD
    		STREET 2:		.
    		CITY:			GREENWICH
    		STATE:			CT
    		ZIP:			06830
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>PRE 14A
    <SEQUENCE>1
    <FILENAME>d840791dpre14a.htm
    <DESCRIPTION>PRE 14A
    <TEXT>
    Document 1 - file: d840791dpre14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>2
    <FILENAME>wrb-20241231.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
    <TEXT>
    Document 2 - file: wrb-20241231.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>g840791g00n18.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: g840791g00n18.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>g840791g01s20.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: g840791g01s20.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>g840791g04o98.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: g840791g04o98.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>g840791g04r96.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g840791g04r96.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g840791g04v64.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g840791g04v64.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g840791g10a20.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g840791g10a20.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>g840791g12a01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: g840791g12a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>g840791g12a02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g840791g12a02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>g840791g12a03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g840791g12a03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>g840791g13a95.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g840791g13a95.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>g840791g13g13.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g840791g13g13.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>g840791g14a96.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g840791g14a96.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>g840791g14b97.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g840791g14b97.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>g840791g14c98.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g840791g14c98.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>g840791g15a01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g840791g15a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>g840791g15b02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g840791g15b02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>g840791g15e94.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g840791g15e94.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>g840791g16a01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: g840791g16a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>g840791g16a02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: g840791g16a02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>g840791g16a03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 22 - file: g840791g16a03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>g840791g17a01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 23 - file: g840791g17a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>g840791g17a03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 24 - file: g840791g17a03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>g840791g17b02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 25 - file: g840791g17b02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>g840791g17q12.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 26 - file: g840791g17q12.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>g840791g19t16.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 27 - file: g840791g19t16.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>g840791g21g08.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 28 - file: g840791g21g08.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>g840791g25t86.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 29 - file: g840791g25t86.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>g840791g33a33.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 30 - file: g840791g33a33.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>g840791g33b33.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 31 - file: g840791g33b33.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>g840791g36a98.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 32 - file: g840791g36a98.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>g840791g37a37.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 33 - file: g840791g37a37.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>34
    <FILENAME>g840791g37b37.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 34 - file: g840791g37b37.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>35
    <FILENAME>g840791g40k40.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 35 - file: g840791g40k40.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>36
    <FILENAME>g840791g41a00.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 36 - file: g840791g41a00.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>37
    <FILENAME>g840791g41n94.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 37 - file: g840791g41n94.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>38
    <FILENAME>g840791g48p48.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 38 - file: g840791g48p48.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>39
    <FILENAME>g840791g49x36.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 39 - file: g840791g49x36.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>40
    <FILENAME>g840791g50b50.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 40 - file: g840791g50b50.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>41
    <FILENAME>g840791g51a90.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 41 - file: g840791g51a90.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>42
    <FILENAME>g840791g52l52.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 42 - file: g840791g52l52.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>43
    <FILENAME>g840791g55k55.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 43 - file: g840791g55k55.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>44
    <FILENAME>g840791g56k56.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 44 - file: g840791g56k56.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>45
    <FILENAME>g840791g59a00.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 45 - file: g840791g59a00.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>46
    <FILENAME>g840791g59b11.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 46 - file: g840791g59b11.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>47
    <FILENAME>g840791g59c22.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 47 - file: g840791g59c22.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>48
    <FILENAME>g840791g70a52.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 48 - file: g840791g70a52.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>49
    <FILENAME>g840791g72i53.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 49 - file: g840791g72i53.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>50
    <FILENAME>g840791g76b84.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 50 - file: g840791g76b84.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>51
    <FILENAME>g840791g83a10.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 51 - file: g840791g83a10.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>52
    <FILENAME>g840791g83b11.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 52 - file: g840791g83b11.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>53
    <FILENAME>g840791g84a12.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 53 - file: g840791g84a12.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>54
    <FILENAME>g840791g88m20.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 54 - file: g840791g88m20.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>55
    <FILENAME>g840791g88w63.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 55 - file: g840791g88w63.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>56
    <FILENAME>g840791g94w75.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 56 - file: g840791g94w75.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>57
    <FILENAME>g840791g96q01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 57 - file: g840791g96q01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>59
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 59 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>60
    <FILENAME>R2.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 60 - file: R2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>61
    <FILENAME>R3.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 61 - file: R3.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>62
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 62 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>63
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 63 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>64
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 64 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>66
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 66 - file: FilingSummary.html

    Document 66 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>68
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 68 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>69
    <FILENAME>0001193125-25-081612-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 69 - file: 0001193125-25-081612-xbrl.zip

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>70
    <FILENAME>d840791dpre14a_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 70 - file: d840791dpre14a_htm.html

    Document 70 - RAW XML: d840791dpre14a_htm.xml

    </DOCUMENT>
    </SEC-DOCUMENT>