Alector (ALEC) stock: insider trades, news & valuation
Heavy sellingShare price and insider trades
Alector insider trading at a glance (Oct 9, 2026): in the past 12 months, 0 insiders bought $0 and 4 sold $1.0M of ALEC stock on the open market.
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ALEC insider buying and selling by quarter
Open-market purchases (green, above the line) and sales (red, below), by trade date.
| Quarter | Bought | Purchases | Sold | Sales |
|---|---|---|---|---|
| Q4 2026 | — | 0 | — | 0 |
| Q3 2026 | — | 0 | $296K | 5 |
| Q2 2026 | — | 0 | $233K | 5 |
| Q1 2026 | — | 0 | $273K | 6 |
| Q4 2025 | — | 0 | $220K | 5 |
Valuation, profit and volume
Summary
Over the past 12 months, 0 Alector, Inc. insiders reported open-market purchases totaling $0, while 4 insiders reported sales totaling $1.0M. 10 of 21 recorded sales were made under pre-scheduled Rule 10b5-1 trading plans, which are usually less informative than discretionary sales.
ALEC earnings: how the stock reacted
Each quarterly results release (SEC 8-K Item 2.02), the trend before it, insider trades in the 30 days before, and the 2-day market reaction. “E” marks releases on the chart above.
| Release | 15 days before | Insiders, 30 days before | Reaction (2 days) | Next 30 days |
|---|---|---|---|---|
| Oct 5, 2026 | -2.2% | None | +0.0%S&P +1.2% | pending |
| Aug 6, 2026 | -3.2% | None | +19.5%S&P +0.5% | +38.2% |
| May 7, 2026 | +4.5% | Sold $5K | -18.3%S&P +0.5% | -22.1% |
| Feb 25, 2026 | +11.7% | None | +16.9%S&P +0.3% | -21.9% |
| Nov 6, 2025 | -60.9% | None | +2.0%S&P -1.0% | -4.7% |
| Oct 21, 2025 | -0.3% | None | -51.4%S&P -0.5% | -23.0% |
| Aug 7, 2025 | -16.9% | None | +50.3%S&P +0.7% | +40.0% |
| May 8, 2025 | -8.1% | None | +14.7%S&P +0.6% | +27.4% |
Most companies bar insiders from trading in the weeks before results, so pre-earnings purchases are rare and often made by directors or under pre-set plans. Past reactions don't predict future ones.
Insider transactions
Open-market purchases and sales.
| Filed | Insider | Type | Shares | Price | Value | Since | Score |
|---|---|---|---|---|---|---|---|
| Sep 4SEC | Arnon RosenthalCEO | Sell | 72,6062,294,600 held (−3%) | $2.66 | $193K | -21.8% | — |
| Sep 4SEC | Neil Lindsay BerkleyCFO | Sell | 29,251350,649 held (−8%) | $2.66 | $78K | -21.8% | — |
| Sep 4SEC | Grace Wong-saradPrincipal Accounting Officer | Sell Plan | 5,165109,640 held (−4%) | $2.67 | $14K | -22.1% | — |
| Sep 4SEC | Grace Wong-saradPrincipal Accounting Officer | Sell Plan | 3,625106,015 held (−3%) | $2.51 | $9K | -17.1% | — |
| Sep 4SEC | Grace Wong-saradPrincipal Accounting Officer | Sell Plan | 656114,805 held (−1%) | $2.75 | $2K | -24.4% | — |
| Jun 3SEC | Arnon RosenthalCEO | Sell | 87,2162,367,206 held (−4%) | $1.97 | $172K | +5.6% | — |
| Jun 3SEC | Neil Lindsay BerkleyCFO | Sell | 19,360379,900 held (−5%) | $1.97 | $38K | +5.6% | — |
| Jun 3SEC | Grace Wong-saradPrincipal Accounting Officer | Sell Plan | 5,70998,936 held (−5%) | $1.97 | $11K | +5.6% | — |
| Jun 3SEC | Grace Wong-saradPrincipal Accounting Officer | Sell Plan | 3,47595,461 held (−4%) | $1.88 | $7K | +10.6% | — |
| Apr 17SEC | Grace Wong-saradPrincipal Accounting Officer | Sell Plan | 1,820104,645 held (−2%) | $2.65 | $5K | -21.5% | — |
| Mar 12SEC | Grace Wong-saradPrincipal Accounting Officer | Sell Plan | 1,000106,465 held (−1%) | $2.65 | $3K | -21.5% | — |
| Mar 3SEC | Arnon RosenthalCEO | Sell | 81,8642,338,176 held (−3%) | $2.12 | $174K | -1.9% | — |
| Mar 3SEC | Neil Lindsay BerkleyCFO | Sell | 29,649344,660 held (−8%) | $2.12 | $63K | -1.9% | — |
| Mar 3SEC | Grace Wong-saradPrincipal Accounting Officer | Sell | 8,071110,832 held (−7%) | $2.12 | $17K | -1.9% | — |
| Mar 3SEC | Grace Wong-saradPrincipal Accounting Officer | Sell Plan | 3,367107,465 held (−3%) | $2.08 | $7K | +0.0% | — |
| Feb 26SEC | Grace Wong-saradPrincipal Accounting Officer | Sell Plan | 4,079118,903 held (−3%) | $2.50 | $10K | -16.8% | — |
| Dec 8SEC | Grace Wong-saradPrincipal Accounting Officer | Sell Plan | 4,753122,982 held (−4%) | $1.21 | $6K | +71.9% | — |
| Dec 3SEC | Arnon RosenthalCEO | Sell | 104,3472,420,040 held (−4%) | $1.12 | $117K | +85.7% | — |
| Dec 3SEC | Sara Kenkare-mitraPresident | Sell | 41,687501,652 held (−8%) | $1.12 | $47K | +85.7% | — |
| Dec 3SEC | Neil Lindsay BerkleyCFO | Sell | 37,261374,309 held (−9%) | $1.12 | $42K | +85.7% | — |
| Dec 3SEC | Grace Wong-saradPrincipal Accounting Officer | Sell | 8,056127,735 held (−6%) | $1.12 | $9K | +85.7% | — |
Insiders at Alector, Inc.
| Insider | Bought | Sold | Last filing | Score |
|---|---|---|---|---|
| Arnon RosenthalCEO | — | $655K | Sep 4, 2026 | — |
| Neil Lindsay BerkleyCFO | — | $221K | Sep 4, 2026 | — |
| Grace Wong-saradPrincipal Accounting Officer | — | $99K | Sep 4, 2026 | — |
| Sara Kenkare-mitraPresident | — | $47K | Dec 3, 2025 | — |
ALEC stock: common questions
Are Alector, Inc. insiders buying ALEC stock?
In the past 12 months, 0 insiders reported open-market purchases of ALEC worth $0.
Are Alector, Inc. insiders selling ALEC stock?
4 insiders reported sales worth $1.0M over the same period.
Where does this data come from?
Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.
What is ALEC's 52-week range?
Over the past year ALEC has traded between $1.14 and $3.31. It last closed at $2.08 on Oct 9, 2026.