Robert Langer
CIK 1239757 · View on SEC EDGAR ↗
Insider
First SEC filing: Dec. 3, 2020 · Latest: Feb. 3, 2023
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 30 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
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| July 28, 2026 | SEER | A | 25,000 | — | — | 25,000 Direct | — | Acquired | (price as of 2026-08-19) |
| July 28, 2026 | SEER | A | 16,500 | — | — | 821,025 Direct | +2.05% | Acquired | (price as of 2026-08-19) |
| May 6, 2024 | MRNA | A | 7,557 | — | — | 7,557 Direct | — | Acquired | (price as of 2026-08-19) |
| June 14, 2023 | SEER | A | 34,735 | — | — | 34,735 Direct | — | Acquired | (price as of 2026-08-19) |
| June 14, 2023 | SEER | A | 23,443 | — | — | 725,847 Direct | +3.34% | Acquired | (price as of 2026-08-19) |
| May 3, 2023 | MRNA | A | 6,134 | — | — | 6,134 Direct | — | Acquired | (price as of 2026-08-19) |
| Aug. 17, 2022 | KRRO | D | 14,846 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| Aug. 17, 2022 | KRRO | A | 14,846 | — | — | 14,846 Direct | — | Acquired | (price as of 2026-08-19) |
| Aug. 17, 2022 | KRRO | D | 14,846 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| Aug. 17, 2022 | KRRO | A | 14,846 | — | — | 14,846 Direct | — | Acquired | (price as of 2026-08-19) |
| June 21, 2022 | KRRO | A | 14,846 | — | — | 14,846 Direct | — | Acquired | (price as of 2026-08-19) |
| June 15, 2022 | SEER | A | 29,640 | — | — | 29,640 Direct | — | Acquired | (price as of 2026-08-19) |
| June 15, 2022 | SEER | A | 9,945 | — | — | 702,404 Direct | +1.44% | Acquired | (price as of 2026-08-19) |
| April 28, 2022 | MRNA | A | 5,415 | — | — | 5,415 Direct | — | Acquired | (price as of 2026-08-19) |
| April 28, 2022 | MRNA | M | 703 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| April 28, 2022 | MRNA | M | 703 | — | — | 11,467,664 Direct | +0.01% | Acquired | (price as of 2026-08-19) |
| Jan. 10, 2022 | SEER | C | 327,102 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| Jan. 10, 2022 | SEER | C | 327,102 | — | — | 692,459 Direct | +89.53% | Acquired | (price as of 2026-08-19) |
| June 17, 2021 | SEER | A | 15,000 | — | — | 15,000 Direct | — | Acquired | (price as of 2026-08-19) |
| June 17, 2021 | KRRO | A | 14,846 | — | — | 14,846 Direct | — | Acquired | (price as of 2026-08-19) |
| April 28, 2021 | MRNA | A | 703 | — | — | 703 Direct | — | Acquired | (price as of 2026-08-19) |
| April 28, 2021 | MRNA | A | 4,081 | — | — | 4,081 Direct | — | Acquired | (price as of 2026-08-19) |
| Nov. 17, 2020 | KRRO | G | 56,912 | — | — | 214,326 Direct | -20.98% | Disposed | (price as of 2026-08-19) |
| June 11, 2020 | KRRO | A | 14,846 | — | — | 14,846 Direct | — | Acquired | (price as of 2026-08-19) |
| April 29, 2020 | MRNA | A | 18,270 | — | — | 18,270 Direct | — | Acquired | (price as of 2026-08-19) |
| June 27, 2019 | MRNA | A | 54,660 | — | — | 54,660 Direct | — | Acquired | (price as of 2026-08-19) |
| Dec. 11, 2018 | MRNA | C | 4,559 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| Dec. 11, 2018 | MRNA | C | 4,559 | — | — | 11,466,961 Direct | +0.04% | Acquired | (price as of 2026-08-19) |
| June 12, 2018 | KALA | A | 12,960 | — | — | 12,960 Direct | — | Acquired | (price as of 2026-08-19) |
| July 19, 2017 | KALA | A | 12,960 | — | — | 12,960 Direct | — | Acquired | (price as of 2026-08-19) |
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 |
|---|---|---|---|---|---|---|---|
| July 28, 2026 | SEER | Stock Option (right to buy) | Class A Common Stock (25,000) | $2.14 | July 28, 2036 | 25,000 | Acquired |
| May 6, 2024 | MRNA | Stock Option (Right to Buy) | Common Stock (7,557) | $122.13 | May 6, 2034 | 7,557 | Acquired |
| June 14, 2023 | SEER | Stock Option (right to buy) | Class A Common Stock (34,735) | $4.33 | June 14, 2033 | 34,735 | Acquired |
| May 3, 2023 | MRNA | Stock Option (Right to Buy) | Common Stock (6,134) | $130.14 | May 3, 2033 | 6,134 | Acquired |
| Aug. 17, 2022 | KRRO | Stock Option | Common Stock (14,846) | $10.14 | June 16, 2031 | 14,846 | Disposed |
| Aug. 17, 2022 | KRRO | Stock Option | Common Stock (14,846) | $2.14 | June 16, 2031 | 14,846 | Acquired |
| Aug. 17, 2022 | KRRO | Stock Option | Common Stock (14,846) | $18.63 | June 10, 2030 | 14,846 | Disposed |
| Aug. 17, 2022 | KRRO | Stock Option | Common Stock (14,846) | $2.14 | June 10, 2030 | 14,846 | Acquired |
| June 21, 2022 | KRRO | Stock Option | Common Stock (14,846) | $1.17 | June 20, 2032 | 14,846 | Acquired |
| June 15, 2022 | SEER | Stock Option (right to buy) | Class A Common Stock (29,640) | $7.33 | June 15, 2032 | 29,640 | Acquired |
| April 28, 2022 | MRNA | Stock Option (Right to Buy) | Common Stock (5,415) | $142.52 | — | 5,415 | Acquired |
| April 28, 2022 | MRNA | Restricted Stock Units | Common Stock (703) | $0.00 | — | 703 | Disposed |
| Jan. 10, 2022 | SEER | Class B Common Stock | Class A Common Stock (327,102) | — | — | 327,102 | Disposed |
| June 17, 2021 | SEER | Stock Option (right to buy) | Class A Common Stock (15,000) | $33.74 | June 17, 2031 | 15,000 | Acquired |
| June 17, 2021 | KRRO | Stock Option | Common Stock (14,846) | $10.14 | June 16, 2031 | 14,846 | Acquired |
| April 28, 2021 | MRNA | Restricted Stock Units | Common Stock (703) | $0.00 | — | 703 | Acquired |
| April 28, 2021 | MRNA | Stock Option (Right to Buy) | Common Stock (4,081) | $178.68 | April 28, 2031 | 4,081 | Acquired |
| June 11, 2020 | KRRO | Stock Option | Common Stock (14,846) | $18.63 | June 10, 2030 | 14,846 | Acquired |
| April 29, 2020 | MRNA | Stock Option (Right to Buy) | Common Stock (18,270) | $46.37 | April 29, 2030 | 18,270 | Acquired |
| June 27, 2019 | MRNA | Stock Option (Right to Buy) | Common Stock (54,660) | $14.34 | June 27, 2029 | 54,660 | Acquired |
| Dec. 11, 2018 | MRNA | Series G Preferred Stock | Common Stock (4,559) | — | — | 4,559 | Disposed |
| June 12, 2018 | KALA | Stock Option (right to buy) | Common Stock (12,960) | $13.73 | June 11, 2028 | 12,960 | Acquired |
| July 19, 2017 | KALA | Stock Option (right to buy) | Common Stock (12,960) | $15.00 | July 18, 2027 | 12,960 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 28 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Dec. 3, 2020 | SEER | Class A Common Stock | 159,526 | Direct |
| Dec. 3, 2020 | SEER | Series A Convertible Preferred Stock→ Class A Common Stock (205,831) | 205,831 | Direct |
| Dec. 3, 2020 | SEER | Class B Common Stock→ Class A Common Stock (327,102) | 327,102 | Direct |
| Dec. 3, 2020 | SEER | Stock Option (right to buy)→ Class A Common Stock (104,048) | 104,048 | Direct |
| Dec. 3, 2020 | SEER | Stock Option (right to buy)→ Class A Common Stock (101,886) | 101,886 | Direct |
| Dec. 3, 2020 | SEER | Stock Option (right to buy)→ Class A Common Stock (121,562) | 121,562 | Direct |
| Oct. 2, 2019 | KRRO | Common Stock | 271,238 | Direct |
| Oct. 2, 2019 | KRRO | Common Stock | 8,565 | Indirect |
| Oct. 2, 2019 | KRRO | Common Stock | 8,565 | Indirect |
| Oct. 2, 2019 | KRRO | Common Stock | 8,565 | Indirect |
| Oct. 2, 2019 | KRRO | Stock Option→ Common Stock (42,313) | 42,313 | Direct |
| Oct. 2, 2019 | KRRO | Stock Option→ Common Stock (180,139) | 180,139 | Direct |
| Oct. 2, 2019 | KRRO | Stock Option→ Common Stock (120,090) | 120,090 | Direct |
| Dec. 7, 2018 | MRNA | Common Stock | 11,462,402 | Direct |
| Dec. 7, 2018 | MRNA | Common Stock | 14,132 | Indirect |
| Dec. 7, 2018 | MRNA | Common Stock | 14,132 | Indirect |
| Dec. 7, 2018 | MRNA | Common Stock | 14,132 | Indirect |
| Dec. 7, 2018 | MRNA | Series G Preferred Stock→ Common Stock (4,559) | 4,559 | Direct |
| Dec. 7, 2018 | MRNA | Stock Option (Right to Buy)→ Common Stock (23,853) | 23,853 | Direct |
| Dec. 7, 2018 | MRNA | Stock Option (Right to Buy)→ Common Stock (80,550) | 80,550 | Direct |
| Dec. 7, 2018 | MRNA | Stock Option (Right to Buy)→ Common Stock (24,165) | 24,165 | Direct |
| Dec. 7, 2018 | MRNA | Stock Option (Right to Buy)→ Common Stock (42,201) | 42,201 | Direct |
| Dec. 7, 2018 | MRNA | Stock Option (Right to Buy)→ Common Stock (40,307) | 40,307 | Direct |
| July 19, 2017 | KALA | Common Stock | 326,402 | Direct |
| July 19, 2017 | KALA | Stock Option (right to buy)→ Common Stock (44,082) | 44,082 | Direct |
| June 21, 2016 | RNAC | Common Stock | 457,603 | Direct |
| June 21, 2016 | RNAC | Stock Option (right to buy)→ Common Stock (25,641) | 25,641 | Direct |
| June 21, 2016 | RNAC | Stock Option (right to buy)→ Common Stock (73,451) | 73,451 | Direct |