Eleven commodity vessels passed through Bab el-Mandeb on Sunday, July 26 — the lowest daily count in months, according to shipping data from Kpler. The reading followed Houthi claims that the group had attacked Saudi oil installations along the Red Sea coast; Saudi Arabia and Aramco had not confirmed those strikes when The National reported on Sunday. Traffic through the Strait of Hormuz also remained depressed.
The count shows both the speed and the limits of alternative data: physical behavior can be measured before official statistics describe the economic consequence, but one day’s movement does not establish a blockade.
The count is only the top line
Reuters reporting syndicated by Al-Monitor said seven of the 11 vessels were oil tankers. Three were entering the Red Sea: two very large crude carriers heading to Yanbu to load Saudi oil and one Russian-linked ship. Four tankers exited, carrying combinations of Saudi, Emirati and Russian crude toward China and Pakistan.
That vessel-level detail is what turns a traffic count into an investable or operational signal. Direction, vessel class, cargo estimate, flag and destination help distinguish a generalized shutdown from a rerouting problem, a loading disruption or a temporary pause among particular operators.
A live signal still needs a baseline
“Lowest in months” is directionally useful but incomplete without the normal distribution by weekday, vessel type and conflict regime. Shipping traffic is lumpy. A serious model would compare the 11-vessel print with trailing averages, scheduled arrivals, port calls and automatic-identification-system coverage rather than treating one day as a settled trend.
Cross-checking also matters. The National reported, citing Kpler, that newly loaded Saudi crude for Asia was moving north through Suez and then around the Cape of Good Hope, while some cargoes loaded before the Houthi embargo claim continued through Bab el-Mandeb. It estimated a Yanbu-to-South Korea voyage at about 24 days through Bab el-Mandeb versus 54 days by the longer route. That difference connects movement data to freight cost, delivery timing and working capital.
What buyers are actually paying for
The raw ingredients — transponder messages, vessel registries and port observations — are not the whole product. Buyers pay for entity resolution, cargo inference, historical normalization and the confidence to say when a ship went dark or a route genuinely changed.
The next test is persistence. If Bab el-Mandeb traffic stays near the July 26 level, the signal should appear in freight rates, refinery schedules and inventory expectations. If traffic rebounds, the 11-ship count may still have been useful as an alert — but not as proof of a durable blockade. Good alternative data shortens the time to a question. It does not eliminate the work of answering it.
Sources: Reuters via Al-Monitor; The National.
