By Rachel Louise Ensign And Aruna Viswanatha 

A U.S. independent monitor said HSBC Holdings PLC is moving too slowly to fix some of its compliance problems, a tough assessment that comes as the bank is grappling with other issues, including allegations it aided tax evasion.

The monitor's report, summarized in a court filing Wednesday, comes as the bank has spent handsomely and hired thousands of staffers in an effort to overhaul its controls in the wake of a $1.9 billion settlement over allegations it violated laws against money laundering.

Monitor Michael Cherkasky applauded the compliance efforts of top leaders and the bank's adoption of strong anti-money-laundering standards around the world. But he said HSBC's corporate culture and rusty technology systems are impeding the implementation of those standards. The report follows a review that included different lines of business and a number of countries.

The monitor believes "HSBC group can--and must--do more," the filing says. The filing is prosecutors' summary of a longer annual report from the monitor that isn't made public.

The monitor's opinion of the bank's overhaul is crucial. HSBC in general has to follow the monitor's recommendations on improving its systems. Prosecutors also typically take a monitor's evaluation into account when deciding whether to drop criminal charges that were deferred as part of a settlement.

The bank in 2012 entered into a five-year deferred-prosecution agreement to settle allegations that included failure to catch at least $881 million in drug-trafficking proceeds laundered through its U.S. bank. Authorities also alleged that HSBC staff stripped data from transactions with Iran, Libya and Sudan to evade U.S. sanctions.

"We continue to meet all of our obligations under the [deferred-prosecution agreement], and remain firmly committed to putting in place a robust [anti-money-laundering] and sanctions compliance program. We are making steady progress toward that objective and appreciate the monitor's ongoing work," HSBC's chief legal officer, Stuart Levey, said in a statement.

The bank has hired several thousand compliance staff, including high-profile former government enforcement officials such as Mr. Levey, a former senior U.S. Treasury Department official, and Jonathan Evans, the former head of the U.K.'s counterintelligence service.

The bank said HSBC's spending on regulatory programs and compliance contributed to rise in operating expenses in 2014 and that since the agreement in 2012, its compliance staff has doubled to about 6,800.

U.S. authorities have faulted many of the largest global banks for weak anti-money-laundering controls, and many of these banks are under related orders by regulators to improve compliance. J.P. Morgan Chase & Co., for instance, agreed to pay $1.7 billion last year and reform its anti-money-laundering policies to resolve criminal charges that it failed to report red flags associated with Bernard Madoff, who was convicted of running a Ponzi scheme.

Some of these banks also face criticism from monitors installed as part of settlement agreements. Standard Chartered PLC agreed to pay a $300 million penalty last year to New York's financial regulator, which cited a monitor's finding that it hadn't lived up to promises to improve controls that were made as part of a 2012 settlement.

Still, the critical report from the monitor comes at an especially tough time for HSBC. The bank recently posted poor financial results and has been beset by criticism amid allegations that its Swiss unit helped its clients avoid taxes.

The bank said the Swiss unit at the center of the tax-evasion allegations had a "different culture" that "was not fully integrated into HSBC," being largely formed from acquisitions.

HSBC's monitor said that top leaders at the bank are doing a good job of taking responsibility for the bank's anti-money-laundering and sanctions compliance program, but criticized other staffers, the filing said. Senior managers at the U.S. unit's global banking and markets business inappropriately pushed back against negative findings from internal auditors and others, the filing said. Individuals involved in this incident had their bonuses reduced.

Mr. Cherkasky said the bank's compliance technology remains "an area of material weakness," the filing said. These systems are fragmented, which prevents bank investigators from easily reviewing customer records when evaluating suspicious activity. Mr. Cherkasky said these systems needed improvement in his initial report on the bank's progress last year.

HSBC has good plans to improve these technology problems, but actually executing them will be "difficult, expensive and time consuming," according to the filing.

Write to Rachel Louise Ensign at rachel.ensign@wsj.com

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