Insider · CIK 0002061438
David Dieter
Files at COLL (COLLEGIUM PHARMACEUTICAL, INC). First filing Mar 11, 2026, latest Mar 20, 2026.
In brief
David Dieter files SEC Form 4 as officer at COLL (COLLEGIUM PHARMACEUTICAL, INC). Since Mar 11, 2026, David Dieter has reported 0 open-market buys worth $0 and 2 open-market sells worth $716k, the latest filed on Mar 20, 2026.
A track record needs three past buys with six months of prices behind them; David Dieter has 0, so none is measured yet.
The newest scored trade: sold $488k of COLL on Mar 18, 2026, filed Mar 20, 2026, scored 18 (weak), under a 10b5-1 plan. In the last 12 months: 0 buys worth $0 and 2 sells worth $716k.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
COLL: COLLEGIUM PHARMACEUTICAL, INC
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 18Weak | COLLEGIUM PHARMACEUTICAL, INC | $488k 13,976 shares | -15% | +41% from low-30% from high | |
| 16Weak | COLLEGIUM PHARMACEUTICAL, INC | $228k 6,224 shares | -6% | +51% from low-25% from high |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Mar 18, 2026 | COLL COLLEGIUM PHARMACEUTICAL, INC | 13,976 0.04% of outstanding | $488k | Mar 18, 2026 | $228k |
| Mar 9, 2026 | COLL COLLEGIUM PHARMACEUTICAL, INC | 6,224 0.02% of outstanding | $228k | Mar 9, 2026 | none |
Transactions
Every row this insider has filed, 7 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Mar 17, 2026 | COLL COLLEGIUM PHARMACEUTICAL, INC | FTax withholding Common Stock | -8,840 | $35.72 | $316k | 68,231 | Apr 3, 2026 |
| Mar 18, 2026 | COLL COLLEGIUM PHARMACEUTICAL, INC | SOpen-market sale Common Stock10b5-1 | -13,976 | $34.92 | $488k | 77,071 | Mar 20, 2026 |
| Mar 9, 2026 | COLL COLLEGIUM PHARMACEUTICAL, INC | SOpen-market sale Common Stock10b5-1 | -6,224 | $36.65 | $228k | 91,047 | Mar 11, 2026 |
| Feb 10, 2026 | COLL COLLEGIUM PHARMACEUTICAL, INC | AGrant or award Common Stock | +22,194 | $0.00 | $0 | 91,047 | Feb 12, 2026 |
| Feb 10, 2026 | COLL COLLEGIUM PHARMACEUTICAL, INC | AGrant or award Common Stock | +9,005 | $0.00 | $0 | 100,052 | Feb 12, 2026 |
| Feb 10, 2026 | COLL COLLEGIUM PHARMACEUTICAL, INC | FTax withholding Common Stock | -2,781 | $46.75 | $130k | 97,271 | Feb 12, 2026 |
| Mar 17, 2025 | COLL COLLEGIUM PHARMACEUTICAL, INC | AGrant or award Common Stock | +68,449 | $0.00 | $0 | 68,449 | Mar 19, 2025 |
Questions about David Dieter
Answered from the filings on this page, as of the latest one.
Is David Dieter buying or selling?
In the last 12 months David Dieter reported 0 open-market buys worth $0 and 2 open-market sells worth $716k on SEC Form 4; the latest was sold $488k of COLL on Mar 18, 2026. Grants, option exercises and tax withholding are not counted.
How did David Dieter's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and David Dieter has 0.
Where does David Dieter file Form 4?
David Dieter has filed Form 4 at COLL (COLLEGIUM PHARMACEUTICAL, INC) as EVP & General Counsel. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.