Erina.ai

A stock I own is up a lot. Sell some, protect it, or hold?

Positions up 20% or more, with the trim-collar-hold decision worked through in full — including the case for doing nothing.

  1. 1 Scan winners
  2. 2 Review each
  3. 3 Choose actions
  4. 4 Save plan
When to open it

Open it after a run. A winner that has grown into an oversized share of the book is the single most common unmade decision in a retail portfolio, and it stays unmade because every option feels defensible. On Today it shows up as a queue row before you go looking for it.

What you get

What Erina puts in front of you.

For each runner: what carried the move, whether the multiple re-rated, how the position now sits against the rest of your book — then two or three concrete structures with realized P&L, floor, cap and cost on each, including holding.

  1. 01

    Every runner, flagged

    All positions up 20%+ surfaced together, so you're deciding across the book rather than one name at a time. Ten of them on the sample book.

  2. 02

    What actually carried the move

    Erina separates a re-rating from real growth. A stock that doubled on multiple expansion is a different decision from one that doubled on earnings.

  3. 03

    Structures with the numbers attached

    Trim with realized P&L and remaining exposure. Collars with floor, cap and net cost. Protective puts with the premium as a share of position value.

  4. 04

    Hold is a first-class option

    Holding is presented with its own reasoning, not as the absence of a recommendation. Sometimes the right answer is that the thesis is intact and the multiple is beside the point.

Real output

What it actually says.

Lifted verbatim from this workflow running on the sample book, so you can judge the register of the reasoning before you sign up, not after. Shown as the Advanced view draws it.

workflows / book-protect · balanced growth Sample book
GOOGL 200 sh @ $145.00 now $195.80 +$10,160 (+35.0%)
Erina's read

GOOGL is up 35% since entry and search-monetization headwinds from AI disruption haven't materialized in results yet — Search revenue growth actually re-accelerated last quarter, and Cloud is finally hitting positive operating margin. The stock is trading at ~22× forward, which is only slightly above its 5-year average.

The risk isn't valuation, it's regulatory. DOJ remedies in the search case land later this year and could force structural changes (default-placement bans, ad-auction reform). Position sizing should reflect that binary.

Your choices
Hold through DOJ remedy

Valuation isn't stretched, and the market has already priced in a meaningful negative outcome. If you're holding anything through a binary, this is the one.

P&L impact None Action Set alert
Buy Aug $185 protective put

Two contracts against 200 shares. Defines the loss floor through the ruling window — cheap insurance on a binary event.

Cost ~$700 (0.7%) Floor $185
Trim 20% (sell 40 shares)

Brings position size back to core weight and removes the tail-risk overhang from a chunk of the position.

Realized +$2,032 Remaining 160 sh

Illustrative output on sample data — not a recommendation, and not investment advice. Choosing an option in the app saves it as a tracked plan; Erina never places an order.

In the app

This is the stepper you'll see.

Candidates on the left, Erina's read and the choices on the right, the four steps across the top. Every workflow runs this way — here on the sample book, at step two.

app.erina.ai / workflows / book-protect Your book
Scan winners
2 Review each
3 Choose actions
4 Save plan
1 of 10 reviewed Save & exit
Winners up 20%+
META +44.6% 2.8× your avg position Reviewing
TSLA +63.2% call already sold
NVDA +48.7% earnings Thu
AAPL +33.0% 11% of book
+6 more
META 60 sh @ 400.00 → 578.40 +$10,704 · +44.6%
Erina's read

META is your biggest winner — up 44.6% and now the second-largest position in this book. The run is being carried by ad-price growth and Reels monetization, both structural rather than one-quarter tailwinds. That said, at $578 the stock has re-rated to ~26× forward earnings, its widest multiple in three years, and the position is now ~2.8× your average non-mega-cap allocation.

The question isn't whether the story is intact — it is — but whether the position size still reflects your original conviction. If you'd started fresh today, would you buy 60 shares at $578? Most books say no.

Trim 25%
Sell 15 shares. Books about $2,676 of gains and re-anchors position size closer to your average.
Realized +$2,676 · 45 sh left
Choose this
Costless collar, 60d Erina's pick
Sell the $620 Nov call, buy the $540 Nov put. Zero net cost. Floor at $540, cap at $620, no shares sold.
Floor $540 · Cap $620 · $0
Choose this
Hold, set an alert
Story intact, multiple stretched. Be told if price loses the 50-day or weight crosses 20%.
Alert: <50d or weight >20%
Choose this
Not investment advice. Prices as of last close; option quotes are mid.
Step two of four. Nothing is saved until you choose.
In the Advanced view

The agents that open this for you.

Flip to Advanced and you can put one of these on your book. It checks on its beat, writes to the queue when a line is crossed, and its row is the door to this workflow. Quiet when nothing changed.

See the Advanced view →
Risk Officer No credits

Positions past your size line

“NVDA just passed 20% of your book.”

A tripwire on single-name size. Silent until something crosses.

Risk Officer No credits

Concentration creep

“You own eleven names and roughly one bet.”

Single-name and sector concentration. Silent on weeks nothing crossed.

Start your trial

Show Erina what you own. She'll tell you what needs a decision.

About a minute, no card, no broker login. A first read in seconds, a plain-English answer every morning after that.

No credit card · 30-day trial of the Solo surfaces · about a minute to add your positions · never trades