TM editors' note: This article discusses a penny stock and/or microcap. Such stocks are easily manipulated; do your own careful due diligence.  

Out of over 200+ marijuana stocks, here are just 5 of the biggest marijuana stock losers in trading on Friday, May 18th including Diego Pellicer Worldwide, Inc. (OTC: DPWW) and more...

Cannagrow Holdings, Inc. (OTC: CGRW)

Shares of Cannagrow Holdings, Inc. dropped 8.97% today on higher than the average trading volume on the OTC markets, closing the day at $1.32 USD per share. Recently, CannaGrow announced the completion of construction for three additional climate-controlled greenhouses at the Colorado Buffalo Ranch Grow Facility.

Diego Pellicer Worldwide, Inc. (OTC: DPWW)

Shares of Diego Pellicer Worldwide, Inc. dropped 12.84% today on higher than the average trading volume on the OTC markets, closing the day at $0.02044 USD per share. Recently, the company announced Q1 2018 financial results. 

MGC Pharmaceuticals Ltd. (ASX: MXC) (OTC: MGCLF)

Shares of MGC Pharmaceuticals Ltd. dropped 9.91% today on lower than the average trading volume on the OTC markets, closing the day at $0.05 USD per share. Recently, MGC Pharmaceuticals released an updated May 2018 investor presentation. 

Potnetwork Holdings, Inc. (OTC: POTN)

Shares of Potnetwork Holdings, Inc. dropped 11.52% today on higher than the average trading volume on the OTC markets, closing the day at $0.308 USD per share. Recently, PotNetwork's wholly-owned subsidiary, Diamond CBD, Launched its MediPets CBD line. 

Zelda Therapeutics Ltd. (ASX: ZLD) (OTC: ZLDAF)

Shares of Zelda Therapeutics Ltd. dropped 13.00% today on lower than the average trading volume on the OTC markets, closing the day at $0.087 USD per share. Recently, Zelda announced its quarterly report for the three month period ending on March 31st, 2018.