Share Prices & Company Boards

JSE-listed company data for studying corporate responses to apartheid.

Share Prices (share_prices/)

JSE equity data from Thomson Reuters Datastream:

File	Description
datastream_mv.csv	Market values (wide format, 1,184 columns, 14 horizontally-concatenated export blocks)
datastream_mv_long.csv	NEW (2026-05) — Long-format firm-day market value panel: 4,578,332 rows, 952 firms, 1973–2013
datastream_price_to_book.csv	Price-to-book ratios (1,404 columns)
datastream_data_long.csv	Consolidated long-format share-price panel (335 MB)

Coverage: Post-1973 JSE equities, 952 listed firms with market-value coverage.

File size

The long-format share-price file is 335 MB. Load specific columns or use chunked reading for memory-constrained environments.

MV long format (2026-05)

The wide-format datastream_mv.csv has Datastream metadata blocks that make direct loading awkward. The new long-format datastream_mv_long.csv reshapes the wide export into a clean firm-day panel. The parser is at papers/strikes/02_strikes_paper/code/block_a_parse_datastream_mv.py.

Company Boards (company_boards/)

Board composition snapshots for JSE-listed firms:

File	Year	Description
company_boards_1983.csv	1983	Director-company mapping
company_boards_1985.csv	1985	Director-company mapping
company_boards_1990.csv	1990	Director-company mapping
company_addresses.csv	—	Registered addresses

Source: McGregor's Who Owns Whom; company registrations

Research use: Interlocking directorates, board racial composition, political connections (used in strikes paper).

AMP Firm Management (firm_management/)

File	Rows	Description
AMP_table.csv	7,094	Management scores, sales, employment
AMP_graph_manufacturing.csv	9,207	Manufacturing firm practices
AMP_graph_public.csv	1,963	Public sector organizations
AMP_graph_retail.csv	661	Retail firms

Source: Annual Management Profiles / World Management Survey. Cross-country data — filter by country for SA-specific analysis.