A List of Stocks Is Already a Portfolio Idea
Most apps treat a watchlist as a list of tickers you check on. The moment you put five semiconductor names on one list, though, you have stated a view about semiconductors, and the useful questions are the ones a fund manager would ask: how has this group done as a whole, which of its names is doing something unusual today, what would it cost to own it at sensible weights, and who keeps it current. A Strikeline watchlist answers all of them on the same page, behind the toolbar where you also ask the copilot about the list, edit it, share it, add symbols, set its alerts, see its orders and, on Elite, read Strikeline's analysis of any member you select.
The Index Shows How the Idea Has Done
Every watchlist with at least two members on Elite carries its own index, rebased to 100 at the start of the window and rebuilt each evening from settled closing prices, and again whenever its members or weights change, with a year of history on the chart. You choose how the members count: equally, by market value, by weights you set yourself, or by weights the AI sets. The index is what lets a watchlist stand in for a theme, which is why a thesis check can point at a watchlist and ask whether "memory stocks" beat SMH by three percent in three weeks.
Alerts Watch the Whole List at Once
An alert on a watchlist is a rule for every member rather than a price on one ticker, so a name you add tomorrow is covered the moment it joins. A rule fires when any member moves up, down or either way by a percentage you set from the prior close, when its volume so far today runs at a multiple of what that stock normally trades by the same time of day, when a single minute's volume spikes against the norm for that part of the session, when it makes a new 52-week high or low, or when it breaks the support or resistance from Strikeline's scanner. The rules are checked every 15 minutes through the regular session, each one fires at most once per stock per day, the quiet hours you set for news alerts silence them, and the notification opens the watchlist it came from.
"Normal for the time of day" is measured against each stock's own last 20 trading days, half-hour by half-hour, because trading is never spread evenly across a session and a single daily average would make every busy open look like news. Those profiles are built each night once per stock and shared by everyone who follows it, so a name added to a list today usually gets its volume and 52-week rules from the next day, while its price-move and support and resistance rules work straight away.
The Live scan button, and the copilot when you ask it what is unusual in a list, run the same measurements on demand: each member's change today, its volume against normal, its latest minute against normal, its distance from the 52-week high and low, whether it sits beyond the scanner's levels, and which of the list's rules would fire right now. When the copilot finds something, it offers to turn it into a rule. Watchlist alerts and the scan are part of Pro and Elite.
Allocation Turns the List Into Holdings
A managed allocation commits money in one account to a watchlist, either a dollar amount or a percentage of the account's equity, and from then on Strikeline buys the members to their weights and keeps them there. It rebalances whenever the weights drift past your threshold, on a schedule of weekly, monthly or quarterly if you prefer, and it respects the limits you set on the largest single order, the cash it leaves aside, how many trades it may make in a day and the smallest position worth holding. Rebalances run during the trading day, and any held back by a closed market go out once it opens.
Starting an allocation asks you to confirm that Strikeline will begin buying in the account. An allocation proposed by a thesis check arrives as a draft instead, and its Start button asks the same. Every share it holds is reserved for it, so a manual sale, a covered call or another strategy cannot take them, and when you close the allocation it unwinds what it holds and releases the reservations. Pausing it stops the trading without giving up the reservation. Managed allocation is an Elite feature and needs a linked brokerage account.
The AI Can Keep the List Current
On Elite you can hand a watchlist a mandate in plain language, something like "large-cap memory and storage makers with improving margins", and choose AI weighting. Once a day, and again whenever you save the list, the AI reviews it against that mandate, researching the members' fundamentals and recent news, searching the web and screening for names that fit, and sets the weights; turn on "Let AI add / remove stocks" and it also changes the membership, adding names that fit the mandate and dropping ones that no longer do. It works directly on the list, so the index, the alerts and any allocation on it follow the new members and weights from that point on.
A Watchlist Can Be Shared or Mirrored
On Pro and Elite a watchlist can be shared as a link with a label, optionally behind a password. The shared page shows the list's index, and you choose whether it also shows the members with their weights and the day's setups. If you allow it, the person you share it with can mirror it into an account of their own. A mirror is a live copy: it updates whenever you save the original and whenever the AI reviews it, the receiver cannot edit it, and a receiver on Elite can still put their own allocation on it, so one person's managed list becomes something another person holds at the same weights in their own account.
Each List Brings Its Own Setups
Pro and Elite also see the day's setups from Strikeline's scanner grouped by the watchlists that contain them, so the morning question of what is setting up starts from the names you already care about.