RE:small tradesHouse 36, Latimer, is the assigned Market Maker for EDT on the TSX exchange. As the exchange assigned Market Maker, Latimer executes all 'odd lot' trades for EDT on the TSX only, and not the 6 other electronic exchanges that EDT can sometimes trade on.
People like to call these other exchanges dark pools but that's a bit of a misnomer because any one can see these trades on stockwatch etc, so they really aren't "dark," they just trade on alternate exchanges, usually because the exchange fee's are less for the firms that direct orders to them.
An 'odd lot' trade is anything with a size of less than 500 shares for symbols that trade for less than a dollar per share, so trades of 1-499 shares are all handled by the market maker. For ticker symbols that trade for a dollar or more, an 'odd lot' is 100 shares just for future reference.
The term 'Market Maker' is the most misunderstood term that people like to haphazardly throw around. A "Market Maker" is technically neutral, though they often keep 'inventory' of shares, and they mainly make their money by being the only entity that's legally allowed to simultaneously post a bid and an ask. Retail investors are only allowed to place one or the other at the same time.
Beacause Market Makers are exempt from this rule, their profit stems from the spread, so they try to capture the spread by buying at one price and then selling a penny higher for example. I know this seems futile to most retail investors but it is profitable when you are the Market Maker for say 50 different stocks and collectively trade hundreds of thousands of shares per day. Plus Market Makers pay almost no exchange fees to trade and also Market Makers often just use a computer program to execute all of these 'odd lot' trades. One physical person at a Market Maker firm, with a computer program at hand, can often oversee many different stock symbols.
Here's a good link that explains in detail the role of a Market Maker, oh and Btw, they aren't sending secret trading signals, somebody was pulling your leg.
https://fastercapital.com/content/Market-Maker--Demystifying-Bid-Ask-Spread--The-Role-of-Market-Makers.html