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ROBERT LANGER

CIK 1239757 · last filed 2026-07-30

ROBERT LANGER is a corporate insider who has filed 92 SEC Form 4 insider transactions across 13 companies since 2007. The most recent filing, for SEER, was dated Jul 30, 2026. Across all open-market trades the lifetime net is −$753.4K, making them a net seller over the disclosed history. Current disclosed insider exposure totals $1.65B across reported positions.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$1.65B

Companies

13

Total Filings

92

Lifetime Open-Market Net

-$753.4K

Filer Profile

Reported Address
98 MONTVALE RD
NEWTON, MA 02459
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
SEER Director 821,025 $1.95 $1.60M $0 9 2026-07-30
MRNA Director 11,481,796 $143.97 $1.65B $0 7 2024-05-07
Korro Bio, Inc. (FREQ) Delisted Director 4,458 $14.98 $66.8K $0 5 2022-08-19
Lyra Therapeutics, Inc. (LYRA) Delisted Director 303 $0.70 $212 $0 2 2020-05-06
Rubius Therapeutics, Inc. (RUBY) Delisted Director 7,500 $0.08 $622 -$417.2K 6 2019-10-17
KALA Director — $0.57 — $0 2 2018-06-15
DNIB UNWIND, INC. (BIND) Delisted Director — — — $0 2 2016-06-22
Ocata Therapeutics, Inc. (OCAT) Delisted Director 0 — — $0 7 2016-02-11
MILLIPORE CORP /MA (MIL) Delisted Director 0 — — $0 3 2010-07-16
WYETH (WYE) Delisted Director 12,505 — — $0 5 2009-07-22
ALSERES PHARMACEUTICALS INC /DE (ALSE) Delisted Director — — — $0 2 2009-01-16
MOMENTA PHARMACEUTICALS INC (MNTA) Delisted Director 950,022 — — -$336.2K 5 2008-08-11
ALSERES PHARMACEUTICALS INC /DE (BLSI) Delisted Director — — — $0 1 2007-03-20

Recent Filings

92 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-07-30 SEER Grant (A) +16,500 $0 EDGAR
2025-07-09 SEER Grant (A) +20,500 $0 EDGAR
2024-06-14 SEER Grant (A) +58,178 $0 EDGAR
2024-05-07 MRNA Grant (A) — $0 EDGAR
2023-06-16 SEER Grant (A) +23,443 $0 EDGAR
2023-05-05 MRNA Grant (A) — $0 EDGAR
2022-08-19 Korro Bio, Inc. (FREQ) Delisted Mixed — $0 EDGAR
2022-06-23 Korro Bio, Inc. (FREQ) Delisted Grant (A) — $0 EDGAR
2022-06-17 SEER Grant (A) +9,945 $0 EDGAR
2022-05-02 MRNA Mixed +703 $0 EDGAR
Showing 1–10 of 92
Page 1 of 10
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.