Two of the top candidates vying for the 2020 Democratic presidential nomination, Sens. Bernie Sanders Bernie SandersTrump, Biden will not shake hands at first debate due to COVID-19 Sanders tells Maher 'there will be a number of plans' to remove Trump if he loses Sirota reacts to report of harassment, doxing by Harris supporters MORE (I-Vt.) and Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.), have been among the largest spenders on Amazon while also being the most vocal critics of the tech giant.

The campaigns for the pair of progressive heavyweights have spent nearly $400,000 combined on the online store, according to a Bloomberg News report published Tuesday.

Federal campaign records reviewed by the news outlet revealed the Sanders campaign spent $233,348.51 on Amazon while Warren was the second-largest spender at $151,240.90.

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The expenditures were mostly for office supplies, Bloomberg reports.

Sanders has targeted the online retailer for a number of issues, including reports of unfair working conditions.

In July he tweeted support of Amazon warehouse workers' plan to strike on the retailer’s “Prime Day” sale.

“I stand in solidarity with the courageous Amazon workers engaging in a work stoppage against unconscionable working conditions in their warehouses. It is not too much to ask that a company owned by the wealthiest person in the world treat its workers with dignity and respect,” he tweeted at the time.

Warren has made one focus of her campaign her proposal to break up big tech companies including Amazon, Facebook and Google.

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Spokespeople for the Sanders and Warren campaigns were not immediately available for comment.

Sanders and Warren are not the only Democrats running for president who have criticized the company. Most in the race have expressed concern over the online retailer — and have also spent tens of thousands on the website, according to Bloomberg News.

Bloomberg reports Sen. Cory Booker Cory Anthony BookerSunday shows preview: Lawmakers prepare for SCOTUS confirmation hearings before election The movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump MORE (D-N.J.) spent $58,572.90, former Vice President Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE spent $33,715.96, Andrew Yang Andrew YangBiden's latest small business outreach is just ... awful Doctor who allegedly assaulted Evelyn Yang arrested on federal charges The Hill's Campaign Report: Biden weighs in on police shootings | Who's moderating the debates | Trump trails in post-convention polls MORE spent $31,756.31, Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE spent $30,766.01, South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE (D) spent $12,639.52 and Sen. Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.) spent $4,036.19.

President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE’s campaign also spent $37,180.73 on Amazon, according to Bloomberg News. The president has been a frequent critic of the company as well due to founder and CEO Jeff Bezos Jeffrey (Jeff) Preston BezosTwitter mandates lawmakers, journalists to beef up passwords heading into election Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Amazon planning small delivery hubs in suburbs MORE also owning The Washington Post.

The Bloomberg report did not analyze the spending of former New York City Mayor Michael Bloomberg Michael BloombergBloomberg rolls out M ad buy to boost Biden in Florida Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Bloomberg pays fines for 32,000 felons in Florida so they can vote MORE, the founder of the company, as he has not yet filed campaign expenses since he entered the race last month.