Fung Capital-backed cross-border services business Flow won the backing of American Express Ventures in a round that will fund platform development and hiring.

Language teaching app Duolingo has received series F funding from existing backer CapitalG and is now valued at $1.5bn.

Private equity firm LLR Partners has invested in the Actua and Independence Health-backed customer engagement software provider, taking its total funding to $58m.

Qualcomm Ventures contributed to a $60m round for last-mile delivery service Shadowfax that was led by Flipkart at a $250m valuation.

Circulate Capital aims to cut ocean plastic pollution and has lured corporates including Chevron Phillips, PepsiCo, Coca-Cola, Dow Chemicals, Danone, Unilever and Procter and Gamble to its fund.

Redpoint Ventures has invested $11.2m in the on-demand accomodation provider, which was founded by Vitacon earlier this year.

Salesforce Ventures took part in a $75m series D1 round for sales optimisation platform Highspot that carried its overall funding to the $200m mark.

Cisco Investments returned to reinvest in the sales analysis platform developer in a round that almost doubled its overall funding.

Vanderbilt University joined fellow LPs including Consumer Technology Association in an oversubscribed close for the diversity-focused Harlem Partners Venture Fund I.

Temasek could reportedly invest in CureFit at a valuation of $800m, less than six months after Unilever Ventures participated in a $120m round for the wellness services provider.