Dennis J. Selkoe
CIK 1582306 · View on SEC EDGAR ↗
Insider
First SEC filing: July 24, 2013 · Latest: July 24, 2013
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 48 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
48 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| July 3, 2023 | PRTA | S 10b5-1 | 5,000 | $67.43 | $337,150 | 2,845 Direct | -63.73% | Disposed | -86.4% (price as of 2026-08-21) |
| May 3, 2023 | PRTA | S 10b5-1 | 15,000 | $57.00 | $855,000 | 2,845 Direct | -84.06% | Disposed | -83.9% (price as of 2026-08-21) |
| Oct. 1, 2021 | PRTA | S 10b5-1 | 1,757 | $66.35 | $116,577 | 6,088 Direct | -22.40% | Disposed | -86.1% (price as of 2026-08-21) |
| Oct. 1, 2021 | PRTA | S 10b5-1 | 1,300 | $67.96 | $88,348 | 4,788 Direct | -21.35% | Disposed | -86.5% (price as of 2026-08-21) |
| Oct. 1, 2021 | PRTA | S 10b5-1 | 706 | $69.69 | $49,201 | 2,845 Direct | -19.88% | Disposed | -86.8% (price as of 2026-08-21) |
| Oct. 1, 2021 | PRTA | S 10b5-1 | 1,237 | $68.74 | $85,031 | 3,551 Direct | -25.84% | Disposed | -86.6% (price as of 2026-08-21) |
| July 30, 2021 | PRTA | S 10b5-1 | 2,718 | $49.88 | $135,574 | 2,845 Direct | -48.86% | Disposed | -81.6% (price as of 2026-08-21) |
| July 30, 2021 | PRTA | S 10b5-1 | 2,282 | $48.99 | $111,795 | 5,563 Direct | -29.09% | Disposed | -81.2% (price as of 2026-08-21) |
| Oct. 2, 2017 | PRTA | S | 3,299 | $64.13 | $211,565 | 3,046 Direct | -51.99% | Disposed | -85.7% (price as of 2026-08-21) |
| Oct. 2, 2017 | PRTA | S | 201 | $64.77 | $13,019 | 2,845 Direct | -6.60% | Disposed | -85.8% (price as of 2026-08-21) |
| July 7, 2017 | PRTA | S | 500 | $58.55 | $29,275 | 2,845 Direct | -14.95% | Disposed | -84.3% (price as of 2026-08-21) |
| July 7, 2017 | PRTA | S | 3,000 | $58.04 | $174,120 | 3,345 Direct | -47.28% | Disposed | -84.2% (price as of 2026-08-21) |
| April 3, 2017 | PRTA | S | 3,500 | $55.86 | $195,510 | 2,845 Direct | -55.16% | Disposed | -83.5% (price as of 2026-08-21) |
| March 1, 2017 | PRTA | S | 3,500 | $59.25 | $207,375 | 2,845 Direct | -55.16% | Disposed | -84.5% (price as of 2026-08-21) |
| Nov. 28, 2016 | PRTA | S | 900 | $63.59 | $57,231 | 2,845 Direct | -24.03% | Disposed | -85.5% (price as of 2026-08-21) |
| Nov. 28, 2016 | PRTA | S | 4,100 | $62.17 | $254,897 | 3,745 Direct | -52.26% | Disposed | -85.2% (price as of 2026-08-21) |
| Aug. 22, 2016 | PRTA | S | 1,700 | $55.05 | $93,585 | 2,845 Direct | -37.40% | Disposed | -83.3% (price as of 2026-08-21) |
| Aug. 22, 2016 | PRTA | S | 3,300 | $54.39 | $179,487 | 4,545 Direct | -42.07% | Disposed | -83.1% (price as of 2026-08-21) |
| May 24, 2016 | PRTA | S | 4,820 | $45.00 | $216,900 | 2,845 Direct | -62.88% | Disposed | -79.6% (price as of 2026-08-21) |
| May 23, 2016 | PRTA | S | 180 | $45.00 | $8,100 | 2,845 Direct | -5.95% | Disposed | -79.6% (price as of 2026-08-21) |
| April 4, 2016 | PRTA | S | 5,000 | $45.00 | $225,000 | 2,845 Direct | -63.73% | Disposed | -79.6% (price as of 2026-08-21) |
| Dec. 1, 2015 | PRTA | S | 200 | $69.68 | $13,936 | 2,845 Direct | -6.57% | Disposed | -86.8% (price as of 2026-08-21) |
| Dec. 1, 2015 | PRTA | S | 1,519 | $69.12 | $104,993 | 3,045 Direct | -33.28% | Disposed | -86.7% (price as of 2026-08-21) |
| Dec. 1, 2015 | PRTA | S | 1,406 | $68.19 | $95,875 | 4,564 Direct | -23.55% | Disposed | -86.5% (price as of 2026-08-21) |
| Sept. 1, 2015 | PRTA | S | 2,025 | $55.76 | $112,914 | 2,845 Direct | -41.58% | Disposed | -83.5% (price as of 2026-08-21) |
| Sept. 1, 2015 | PRTA | S | 1,100 | $54.88 | $60,368 | 4,870 Direct | -18.43% | Disposed | -83.3% (price as of 2026-08-21) |
| June 1, 2015 | PRTA | S | 325 | $40.81 | $13,263 | 2,845 Direct | -10.25% | Disposed | -77.5% (price as of 2026-08-21) |
| June 1, 2015 | PRTA | S | 1,100 | $39.42 | $43,362 | 3,170 Direct | -25.76% | Disposed | -76.7% (price as of 2026-08-21) |
| June 1, 2015 | PRTA | S | 1,700 | $38.40 | $65,280 | 4,270 Direct | -28.48% | Disposed | -76.1% (price as of 2026-08-21) |
| March 9, 2015 | PRTA | S | 3,125 | $25.56 | $79,875 | 2,845 Direct | -52.35% | Disposed | -64.0% (price as of 2026-08-21) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| May 15, 2026 | PRTA | Stock Option (Right to Buy) | Ordinary Shares (27,000) | $9.76 | May 15, 2036 | 27,000 | Acquired |
| May 14, 2025 | PRTA | Stock Option (Right to Buy) | Ordinary Shares (20,183) | $6.88 | May 14, 2035 | 20,183 | Acquired |
| May 15, 2024 | PRTA | Stock Option (Right to Buy) | Ordinary Shares (15,000) | $22.39 | May 15, 2034 | 15,000 | Acquired |
| July 3, 2023 | PRTA | Stock Option (Right to Buy) | Ordinary Shares (5,000) | $11.33 | May 20, 2030 | 5,000 | Disposed |
| May 17, 2023 | PRTA | Stock Option (Right to Buy) | Ordinary Shares (15,000) | $76.00 | May 17, 2033 | 15,000 | Acquired |
| May 3, 2023 | PRTA | Stock Option (Right to Buy) | Ordinary Shares (9,000) | $23.97 | May 19, 2031 | 9,000 | Disposed |
| May 3, 2023 | PRTA | Stock Option (Right to Buy) | Ordinary Shares (6,000) | $9.23 | May 22, 2029 | 6,000 | Disposed |
| May 18, 2022 | PRTA | Stock Option (Right to Buy) | Ordinary Shares (15,000) | $25.60 | May 18, 2032 | 15,000 | Acquired |
| Oct. 1, 2021 | PRTA | Stock Option (Right to Buy) | Ordinary Shares (5,000) | $9.23 | May 22, 2029 | 5,000 | Disposed |
| July 30, 2021 | PRTA | Stock Option (Right to Buy) | Ordinary Shares (1,500) | $9.23 | May 22, 2029 | 1,500 | Disposed |
| July 30, 2021 | PRTA | Stock Option (Right to Buy) | Ordinary Shares (3,500) | $16.42 | July 21, 2023 | 3,500 | Disposed |
| May 16, 2018 | PRTA | Stock Option (right to buy) | Ordinary Shares (12,000) | $16.43 | May 16, 2028 | 12,000 | Acquired |
| Oct. 2, 2017 | PRTA | Stock Option (right to buy) | Ordinary Shares (3,500) | $16.42 | July 21, 2023 | 3,500 | Disposed |
| July 7, 2017 | PRTA | Stock Option (right to buy) | Ordinary Shares (3,500) | $16.42 | July 21, 2023 | 3,500 | Disposed |
| May 18, 2017 | PRTA | Stock Option (right to buy) | Ordinary Shares (12,000) | $56.23 | May 18, 2027 | 12,000 | Acquired |
| April 3, 2017 | PRTA | Stock Option (right to buy) | Ordinary Shares (3,500) | $16.42 | July 21, 2023 | 3,500 | Disposed |
| March 1, 2017 | PRTA | Stock Option (right to buy) | Ordinary Shares (3,500) | $16.42 | July 21, 2023 | 3,500 | Disposed |
| Nov. 28, 2016 | PRTA | Stock Option (right to buy) | Ordinary Shares (5,000) | $16.42 | July 21, 2023 | 5,000 | Disposed |
| Aug. 22, 2016 | PRTA | Stock Option (right to buy) | Ordinary Shares (5,000) | $16.42 | July 21, 2023 | 5,000 | Disposed |
| May 24, 2016 | PRTA | Stock Option (right to buy) | Ordinary Shares (4,820) | $16.42 | July 21, 2023 | 4,820 | Disposed |
| May 23, 2016 | PRTA | Stock Option (right to buy) | Ordinary Shares (180) | $16.42 | July 21, 2023 | 180 | Disposed |
| May 20, 2016 | PRTA | Stock Option (right to buy) | Ordinary Shares (15,000) | $42.50 | May 20, 2026 | 15,000 | Acquired |
| April 4, 2016 | PRTA | Stock Option (right to buy) | Ordinary Shares (5,000) | $16.42 | July 21, 2023 | 5,000 | Disposed |
| Dec. 1, 2015 | PRTA | Stock Option (right to buy) | Ordinary Shares (3,125) | $16.42 | July 21, 2023 | 3,125 | Disposed |
| Sept. 1, 2015 | PRTA | Stock Option (right to buy) | Ordinary Shares (3,125) | $16.42 | July 21, 2023 | 3,125 | Disposed |
| June 1, 2015 | PRTA | Stock Option (right to buy) | Ordinary Shares (3,125) | $16.42 | July 21, 2023 | 3,125 | Disposed |
| May 22, 2015 | PRTA | Stock Option (right to buy) | Ordinary Shares (15,000) | $34.04 | May 22, 2025 | 15,000 | Acquired |
| March 9, 2015 | PRTA | Stock Option (right to buy) | Ordinary Shares (3,125) | $16.42 | July 21, 2023 | 3,125 | Disposed |
| July 22, 2013 | PRTA | Stock Option (right to buy) | Ordinary Shares (50,000) | $16.42 | July 21, 2023 | 50,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 2 holdings
Securities held when first becoming an insider, per SEC Form 3.