$SPRO
Spero Therapeutics, Inc. Common Stock
XNAS
Why is SPRO up today? It is at $1.22 (+0.83%), and our scanner flagged it 3 times on unusual volume this month. See the catalyst behind the move, real-time alerts the moment SPRO spikes, and full due diligence on SPRO — key stats, earnings, dilution and insider activity. Free.
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Key Stats
- Price
- $1.22
- Change today
- +0.83%
- Previous close
- $1.21
- 52-week range
- $1.08 – $3.08
- Market cap
- $70M
- Total held
- 2.9%
- Tradeable float
- 56.6M 97% of shares · after 3% insiders + institutional n/a
- Short interest
- 1.4M ▼ -4% vs prior · as of 2026-08-14
- Short % of float
- 2.6%
- Days to cover
- 1.9d
- Avg daily volume
- 744K
- Exchange
- XNAS
- 5m
- 1.6x
- 15m
- 1.4x
- 1h
- 1.4x
- 1D
- --
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Why is $SPRO up today?
Here is the latest on SPRO from our scanner (live price and day move above). Fresh from the SEC: Spero Therapeutics, Inc. filed an 8-K: Material Agreement, Other Material Event. A material company disclosure like this is often the real catalyst behind a move of this size.
Likely catalystPriced share offering, from the latest SEC filing. Read it →Insiders
Insiders buying8 buys, 0 sells last 3 months (10/8 over 12 months)Show 12 recent transactionsMinimize 12 recent transactions
| Insider | Action | Shares | % of position | Owns after | Value | Date |
|---|---|---|---|---|---|---|
Zack Debra Officer | Acquired (grant/award) | +162K 0.3% of company | n/a | 162K | n/a | Aug 3, 26 |
Pottage John C Jr Director | Acquired (grant/award) | +10K 0.02% of company | added 13% | 85K | n/a | Jun 23, 26 |
Jackson Scott Thomas Director | Acquired (grant/award) | +10K 0.02% of company | added 13% | 85K | n/a | Jun 23, 26 |
Thomas Frank E Director | Acquired (grant/award) | +10K 0.02% of company | added 13% | 85K | n/a | Jun 23, 26 |
Vink Patrick V.J.J. Director | Acquired (grant/award) | +10K 0.02% of company | added 13% | 85K | n/a | Jun 23, 26 |
Smith Cynthia Director | Acquired (grant/award) | +10K 0.02% of company | added 13% | 85K | n/a | Jun 23, 26 |
Tregoning Kathleen Director | Acquired (grant/award) | +10K 0.02% of company | added 13% | 85K | n/a | Jun 23, 26 |
Deshpande Milind Director | Acquired (grant/award) | +10K 0.02% of company | added 11% | 101K | n/a | Jun 23, 26 |
Rajavelu Esther Officer | Sold (automatic/other) | -25K 0.04% of company | sold 2.5% | 987K | $63K at $2.51 | May 4, 26 |
Keutzer Timothy Officer | Sold (automatic/other) | -19K 0.03% of company | sold 2.5% | 743K | $44K at $2.36 | Feb 6, 26 |
Rajavelu Esther Officer | Sold (automatic/other) | -88K 0.2% of company | sold 8.0% | 1.01M | $207K at $2.36 | Feb 6, 26 |
Keutzer Timothy Officer | Sold (automatic/other) | -3K | sold 0.5% | 761K | $8K at $2.24 | Feb 4, 26 |
Recent Form-4 filings via Nasdaq. Open-market buys are the signal worth watching. Grants and automatic (10b5-1) sells are routine. “% of position” is the share of that insider’s own holding the trade moved. Not investment advice.
Dilution watch
Active shelfActive shelf on file — the company can issue new shares on demand (valid ~3 years). If $SPRO runs, these filings show who may be positioned to sell new or newly-registered shares into the move.
- About $100.0M in size
Sourced from SEC EDGAR filings (last 9 months); terms read straight from the filing text where available. Ongoing = an at-the-market (ATM) program still selling over time or a live shelf, so it can keep diluting; Completed = a one-time priced sale that already finished. A shelf (S-3) stays effective ~3 years. Form type signals dilution capacity, not an exact share count, and we can't confirm how much of a shelf or ATM remains unused. Not investment advice.
$SPRO Sentiment
BullishBlend of news sentiment, today’s move, and community votes. Not investment advice.
$SPRO Activity
News, unusual-volume alerts, AI-trader trades and community chatter - the whole story, newest first.
SPRO stock FAQ
Why is $SPRO up today?
Here is the latest on SPRO from our scanner (live price and day move above). Fresh from the SEC: Spero Therapeutics, Inc. filed an 8-K: Material Agreement, Other Material Event. A material company disclosure like this is often the real catalyst behind a move of this size.
What is the SPRO stock price today?
SPRO last traded at $1.22, up 0.83% on the day. The price and chart above update live during market hours (4 AM to 8 PM ET).
Where can I see live SPRO alerts?
The SPRO Live Alerts panel on this page streams real-time unusual volume (RVOL), momentum, halt and 200-EMA alerts from our scanner the moment they fire. Our scanner has flagged SPRO 3 times in the last 30 days.
What exchange is SPRO on?
SPRO (Spero Therapeutics, Inc. Common Stock) trades on XNAS, with a market cap of about $70M.
Is SPRO good for day trading?
That depends on your strategy and risk. Day traders look for volume, volatility and a clear trend. Use the live chart, RVOL alerts and 200-EMA context on this page to judge SPRO for yourself. This is not investment advice.
Live data from TheDesperateTrader scanner. Not investment advice.