LONDON, Jan 29 (Reuters) - Portfolio investors recoiled from short positions in U.S. crude futures and options in the most recent week as depleting inventories around the NYMEX delivery point underscored the risk of a squeeze on deliverable barrels.

Hedge funds and other money managers purchased the equivalent of 46 million barrels across the six most important futures and options contracts over the seven days ending on Jan. 23.

Fund buying was dominated by NYMEX and ICE WTI (+56 million barrels) with smaller purchases of U.S. gasoline (+8 million) and European gas oil (+7 million).

Investors sold Brent (-19 million barrels) and U.S. diesel (-6 million), according to records filed with ICE Futures Europe and the U.S. Commodity Futures Trading Commission.

But most of the buying came from reducing existing bearish short positions (-28 million barrels) rather than initiating new bullish long ones (+18 million).

The imbalance was especially pronounced in WTI where managers reduced short positions sharply (-38 million barrels) while initiating a smaller number of new longs (+18 million).

As a result, short positions in the premier NYMEX WTI futures contract were slashed to 79 million barrels from 112 million on Jan. 16 and a high of 128 million on Dec. 12.

Chartbook: Oil and gas positions

Crude inventories around the NYMEX delivery point at Cushing in Oklahoma had depleted to 30 million barrels on Jan. 19 down from 35 million barrels three weeks earlier.

Cushing inventories stood at the lowest for the time of year since 2012 and were 14 million barrels (-32% or -1.26 standard deviations) below the prior ten-year seasonal average.

With inventories shrinking, many fund managers concluded it was no longer safe to run short positions potentially requiring delivery at Cushing.

The net position in WTI jumped to 99 million barrels (6th percentile for all weeks since 2013) up from just 43 million (1st percentile) the previous week.

The gap between ultra-bearish positioning on WTI and neutral positioning in Brent narrowed slightly but remained very wide.

There was still significant scope for short-covering to lift WTI flat prices and calendar spreads if inventories continue to deplete.

Short positions in NYMEX WTI were still almost 4 times higher than at the start of the current short-selling cycle on Oct. 3.

U.S. NATURAL GAS

Investors trimmed positions in the two major futures and options contracts tied to gas prices at Henry Hub in Louisiana.

Investors reverted to selling after trying to build a bullish position, as the big freeze earlier in January was followed by milder weather.

Hedge funds and other money managers sold the equivalent of 596 billion cubic feet (bcf) over the seven days ending on Jan. 23, the fastest rate of sales since August 2021.

It came after fund managers had purchased a total of 1,409 bcf over the previous five weeks, according to regulatory records.

Funds cut their position to 186 bcf net short (26th percentile for all weeks since 2010) from 410 bcf net long (42nd percentile) seven days before.

Front-month futures prices continued to slide and have averaged just $2.81 per million British thermal units so far in January (8th percentile for all months since the start of the century once adjusted for inflation).

The end-of-winter calendar spread between March and April 2024 has fallen to flat from a backwardation of 21 cents at beginning of winter in early October, as traders expect the market to remain oversupplied.

Investors anticipate gas stocks will end winter well above the long-term average so lower prices will be needed to encourage more consumption from power generators and slow production further.

Related columns:

- U.S. oil futures primed for another squeeze on Cushing (January 26, 2023)

- In flat oil market, hedge funds focus on relative risks (January 22, 2023)

- U.S. oil and gas production growth starts to decelerate (January 10, 2024)

- Oil prices hit by resumed hedge fund short selling

John Kemp is a Reuters market analyst. The views expressed are his own. Follow his commentary on X https://twitter.com/JKempEnergy (Editing by Kirsten Donovan)