The Yanbu contrast: full "dark" operations

• July 21, 2026 — The Houthis declared a formal naval blockade against Saudi Arabia, emailing shipping companies that vessels calling at Saudi ports "may be targeted" (Red Sea).
• All Yanbu loadings now AIS-dark — By August 12, Reuters reported that every Yanbu crude loading in recent weeks was conducted with AIS transponders switched off, making vessels invisible to standard maritime tracking (Red Sea).
• Satellite vs. AIS divergence — Satellite imagery from August 3 showed five VLCCs berthed at Yanbu simultaneously — the busiest day since the blockade — but none were transmitting AIS (Red Sea). By July 26, 11 dark tankers were at berth and three more were dark in the waiting area (Red Sea).

Stark discrepancies in Yanbu loading estimates

The shift to dark operations has shattered data consistency among the three major tracking firms:

As Reuters noted, these widely differing export estimates — used by the IEA, OPEC, and traders — underscore how dark tanker operations create severe "blind spots" in global oil supply data (Red Sea). Vortexa appears to capture more dark activity via alternative methods, while Kpler and AXSMarine show steeper visible declines (Red Sea).

The East-West Pipeline pivot and its reversal

• When Iran locked down Hormuz in March 2026, Saudi Arabia rapidly increased flows through its East-West Pipeline (Petroline) to Yanbu, reaching its maximum 7 million bpd capacity by March 28 (Gulf/Pipeline).
• Yanbu loadings surged from ~1.4 million bpd in February to ~4.6 million bpd in late March, with most volumes going to Asia (Yanbu).
• By June, 92% of Saudi seaborne crude exports exited through Yanbu alone (Yanbu).
• The Houthi blockade has now squeezed that Red Sea lifeline, pushing Riyadh to consider a further 2 million bpd pipeline expansion (Pipeline) and explore alternative routes via Egypt's Sumed pipeline and Suez Canal (Pipeline).

Houthi attacks on Saudi tankers and Jazan refinery

• August 5, 2026 — The Saudi-flagged tanker NCC WAFA was struck off Yanbu on a purely domestic coastal run from Yanbu to Jizan, while running dark since July 19 (Red Sea). This demonstrated the Houthis' ability to strike well beyond the Bab el-Mandeb chokepoint.
• July 27, 2026 — Houthis attacked Saudi oil installations along the Red Sea coast, causing ship traffic through Bab el-Mandeb to fall sharply (Red Sea).
• The Jazan refinery — located on the Red Sea coast near the Yemeni border — is within Houthi strike range and has been a recurring target, though precise attack details are limited in the current source set.

Tanker rerouting north through Suez

• On July 21, three oil tankers loaded with Saudi crude for China and India made U-turns in the Red Sea, heading toward the Suez Canal instead of braving the Bab el-Mandeb (Red Sea).
• By July 22, five tankers changed course in the Red Sea, with two signaling Suez as their new destination (Red Sea).
• Egypt's Mediterranean port of Sidi Kerir saw crude exports surge to ~2.3 million bpd in August (more than double the prior month), with the overwhelming majority being Saudi crude rerouted via the Sumed pipeline (Yanbu).

Strategic crossroads: Is Riyadh testing Hormuz resumption?

The dual dynamic strongly suggests Riyadh is cautiously probing whether Persian Gulf loadings can resume through the still-contested Strait of Hormuz, even as it fights to keep Yanbu operational under dark protocols.

• Saudi Arabia shipped ~34 million barrels through Hormuz between June 17 and July 2 after the US-Iran deal (Gulf), more than double its wartime volumes (Gulf).
• But Iranian attacks on tankers in Hormuz resumed in mid-July, collapsing Gulf loadings again (Gulf).
• The August 12 supertanker at Ju'aymah represents Riyadh's third attempt since June to re-establish a Gulf export channel — a calculated test of whether Hormuz is safe enough, even as the Red Sea route comes under escalating Houthi fire (Gulf).

Bottom line: Saudi Arabia is caught between two contested maritime chokepoints. The Persian Gulf route faces periodic Iranian attacks in Hormuz; the Red Sea route via Yanbu faces a systematic Houthi blockade. The result is a strategic hedging operation — tentative Gulf loadings, fully dark Yanbu operations, surging Suez/Sumed diversions, and consideration of a pipeline capacity expansion — that has severely degraded global oil tracking visibility and left Saudi export volumes genuinely uncertain.

The Yanbu contrast: full "dark" operations

• July 21, 2026 — The Houthis declared a formal naval blockade against Saudi Arabia, emailing shipping companies that vessels calling at Saudi ports "may be targeted" (Red Sea).
• All Yanbu loadings now AIS-dark — By August 12, Reuters reported that every Yanbu crude loading in recent weeks was conducted with AIS transponders switched off, making vessels invisible to standard maritime tracking (Red Sea).
• Satellite vs. AIS divergence — Satellite imagery from August 3 showed five VLCCs berthed at Yanbu simultaneously — the busiest day since the blockade — but none were transmitting AIS (Red Sea). By July 26, 11 dark tankers were at berth and three more were dark in the waiting area (Red Sea).

Stark discrepancies in Yanbu loading estimates

The shift to dark operations has shattered data consistency among the three major tracking firms:

As Reuters noted, these widely differing export estimates — used by the IEA, OPEC, and traders — underscore how dark tanker operations create severe "blind spots" in global oil supply data (Red Sea). Vortexa appears to capture more dark activity via alternative methods, while Kpler and AXSMarine show steeper visible declines (Red Sea).

The East-West Pipeline pivot and its reversal

• When Iran locked down Hormuz in March 2026, Saudi Arabia rapidly increased flows through its East-West Pipeline (Petroline) to Yanbu, reaching its maximum 7 million bpd capacity by March 28 (Gulf/Pipeline).
• Yanbu loadings surged from ~1.4 million bpd in February to ~4.6 million bpd in late March, with most volumes going to Asia (Yanbu).
• By June, 92% of Saudi seaborne crude exports exited through Yanbu alone (Yanbu).
• The Houthi blockade has now squeezed that Red Sea lifeline, pushing Riyadh to consider a further 2 million bpd pipeline expansion (Pipeline) and explore alternative routes via Egypt's Sumed pipeline and Suez Canal (Pipeline).

Houthi attacks on Saudi tankers and Jazan refinery

• August 5, 2026 — The Saudi-flagged tanker NCC WAFA was struck off Yanbu on a purely domestic coastal run from Yanbu to Jizan, while running dark since July 19 (Red Sea). This demonstrated the Houthis' ability to strike well beyond the Bab el-Mandeb chokepoint.
• July 27, 2026 — Houthis attacked Saudi oil installations along the Red Sea coast, causing ship traffic through Bab el-Mandeb to fall sharply (Red Sea).
• The Jazan refinery — located on the Red Sea coast near the Yemeni border — is within Houthi strike range and has been a recurring target, though precise attack details are limited in the current source set.

Tanker rerouting north through Suez

• On July 21, three oil tankers loaded with Saudi crude for China and India made U-turns in the Red Sea, heading toward the Suez Canal instead of braving the Bab el-Mandeb (Red Sea).
• By July 22, five tankers changed course in the Red Sea, with two signaling Suez as their new destination (Red Sea).
• Egypt's Mediterranean port of Sidi Kerir saw crude exports surge to ~2.3 million bpd in August (more than double the prior month), with the overwhelming majority being Saudi crude rerouted via the Sumed pipeline (Yanbu).

Strategic crossroads: Is Riyadh testing Hormuz resumption?

The dual dynamic strongly suggests Riyadh is cautiously probing whether Persian Gulf loadings can resume through the still-contested Strait of Hormuz, even as it fights to keep Yanbu operational under dark protocols.

• Saudi Arabia shipped ~34 million barrels through Hormuz between June 17 and July 2 after the US-Iran deal (Gulf), more than double its wartime volumes (Gulf).
• But Iranian attacks on tankers in Hormuz resumed in mid-July, collapsing Gulf loadings again (Gulf).
• The August 12 supertanker at Ju'aymah represents Riyadh's third attempt since June to re-establish a Gulf export channel — a calculated test of whether Hormuz is safe enough, even as the Red Sea route comes under escalating Houthi fire (Gulf).

Bottom line: Saudi Arabia is caught between two contested maritime chokepoints. The Persian Gulf route faces periodic Iranian attacks in Hormuz; the Red Sea route via Yanbu faces a systematic Houthi blockade. The result is a strategic hedging operation — tentative Gulf loadings, fully dark Yanbu operations, surging Suez/Sumed diversions, and consideration of a pipeline capacity expansion — that has severely degraded global oil tracking visibility and left Saudi export volumes genuinely uncertain.