NASDAQ · SPRO
Spero Therapeutics, Inc.
Smart money pulse
What insiders and funds are doing
- account_balance41 funds bought, 18 sold in the quarter ended Jun 30, 2026. 25 were new holders.
- info1 real insider sale in 12 months. $42.5K in total, not counting planned sales.
−100 means everyone selling, +100 everyone buying. This is data, not advice.
How the Pulse works
Pulse runs from −100 (everyone selling) to +100 (everyone buying). Half comes from insiders: real buyers vs. real sellers in the last 90 days (Form 4). Half comes from funds: funds that bought vs. funds that sold last quarter (13F). 13F is a snapshot of long positions on the last day of the quarter, filed up to 45 days later. It does not show short positions or trades since then.
Who owns it
62 funds report owning SPRO, up from 49
Last quarter
Who bought and who sold
Change in shares held, biggest holdings first. Bars stop at ±100%.
Insider trades · last 12 months
Real buys and sales
Last 6 months. A wider screen shows 12.
Showing 1 real trade. Bigger dot means a bigger trade.
Real trades, newest first
Showing every filing. Dashed circles are routine: grants, tax withholding, option exercises and planned sales.
Top holders
Biggest funds in SPRO
| Fund | Value | Change |
|---|---|---|
| GSK PLC | $20.3M | Same |
| Pfizer Inc | $5.34M | Same |
| Vanguard Capital Management LLC | $4.5M | +13% |
| Renaissance Technologies LLC | $2.09M | −20% |
| Alphabet Inc. | $1.97M | Same |