Seer Insider Ownership

NASDAQ SEER

$2.02 -0.01 (-0.49%)

At close: Oct 19, 2026 · 4:00 PM EDT

Insider Holdings by Owner

6.79Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

13.81%

▲+0.139% pp QoQ

Shares Held by Insiders

7.62Mn

filed for Sep 2026

▲+1.02% QoQ

Shares Outstanding

55.16Mn

55,164,080 shares

Direct Holdings

5.20Mn

Indirect: 2.41Mn

Net Shares Traded (QoQ)

+76.91K

net buying in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 5, 2026

Over the past year, SEER insiders sold $194,626 of stock (98.03K shares) on the open market and bought none.

A count shows 3 insiders selling SEER stock on the open market over the past 12 months and none buying.
Omid Farokhzad (CEO and Chair) led open-market sales of SEER stock over the past 12 months with $115,354 (58.22K shares), most recently on February 18, 2026.
David R. Horn (President & CFO) made the most recent open-market trade by an insider of SEER, a sale of 7.31K shares for $14,809 on August 18, 2026.
Away from the open market, SEER insiders received 880.04K shares in stock awards and acquired 3.56Mn shares through option exercises and conversions over the last 12 months.
Per Business Quant data, SEER insiders hold 7.62Mn shares in total based on their latest Form 4 filings, or 13.81% of the 55.16Mn shares outstanding; that total is up 1.02% from 7.54Mn shares at the end of Q2 2026 and up 0.01% from 7.62Mn shares at the end of Q3 2025.
SEER insiders hold 5.2Mn shares directly (68.34% of their total) and 2.41Mn shares (31.66%) indirectly, through entities such as trusts and partnerships.
Per Business Quant, 9 insiders of SEER hold shares, counting officers, directors and 10% owners who have filed a Form 4 in the past two years.
SEER's three largest insider shareholders, based on their latest Form 4 filings, are Omid Farokhzad (CEO and Chair, 5.47Mn shares), Robert Langer (Director, 821.02K shares) and David R. Horn (President & CFO, 486.65K shares).
The holding of Omid Farokhzad makes up 71.77% of all shares held by SEER insiders.
Institutions held 37.18% of SEER's outstanding shares in their Q2 2026 13F filings.
In the past year, 9 insiders of SEER submitted 18 Form 4 filings reporting trades, awards or other transactions.
These insider figures for SEER are based on Form 4 filings through August 19, 2026.

Form 4 Holdings

Insiders Holding SEER

Insiders 16

Shares held 6.79Mn

Of outstanding 12.31%

#	Insider	Position	Direct	Total	Share of Insiders	Last Filed
1	Omid Farokhzad	Ceo And Chair	3,349,064	3,349,064	49.3%	19 Feb, 2026
2	Robert Langer	Director	821,025	821,025	12.1%	30 Jul, 2026
3	David R. Horn	President Cfo	486,650	486,650	7.2%	19 Aug, 2026
4	Omead Ostadan	President Coo	378,238	378,238	5.6%	01 Jun, 2022
5	David Hallal	Director	355,128	355,128	5.2%	14 Jun, 2024
6	Elona Kogan	Chief Legal Officer	273,142	273,142	4.0%	23 Feb, 2024
7	Mostafa Ronaghi	Director	224,903	224,903	3.3%	16 Jun, 2023
8	Cathy Friedman	Director	173,574	173,574	2.6%	16 Jun, 2023
9	Terrance Mcguire	Director	128,566	128,566	1.9%	30 Jul, 2026
10	Meeta Gulyani	Director	124,043	124,043	1.8%	30 Jul, 2026
11	Scott D Thomas	Chief Commercial Officer	95,532	95,532	1.4%	19 May, 2023
12	Nicolas H Phd Roelofs	Director	91,496	91,496	1.3%	30 Jul, 2026
13	Rachel E. Haurwitz	Director	87,615	87,615	1.3%	14 Jun, 2024
14	Dipchand Nishar	Director	75,544	75,544	1.1%	30 Jul, 2026
15	Anthony R. Bazarko	Chief Commercial Officer	75,000	75,000	1.1%	11 May, 2026
16	Isaac Ro	Director	53,375	53,375	0.8%	30 Jul, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

329 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
18 Aug, 2026	David R. Horn	President Cfo	Disposed S	7,309	$2.03	$14.81K	486,650	Direct
28 Jul, 2026	Terrance Mcguire	Director	Acquired A	16,500	$0.00	$0	128,566	Direct
28 Jul, 2026	Meeta Gulyani	Director	Acquired A	16,500	$0.00	$0	124,043	Direct
28 Jul, 2026	Dipchand Nishar	Director	Acquired A	16,500	$0.00	$0	75,544	Direct
28 Jul, 2026	Robert Langer	Director	Acquired A	16,500	$0.00	$0	821,025	Direct
28 Jul, 2026	Nicolas H Phd Roelofs	Director	Acquired A	16,500	$0.00	$0	91,496	Direct
28 Jul, 2026	Isaac Ro	Director	Acquired A	12,375	$0.00	$0	53,375	Direct
28 Jul, 2026	Robert Langer	Director	Acquired A	25,000	$0.00	$0	25,000	Direct
28 Jul, 2026	Meeta Gulyani	Director	Acquired A	25,000	$0.00	$0	25,000	Direct
28 Jul, 2026	Isaac Ro	Director	Acquired A	18,750	$0.00	$0	18,750	Direct
28 Jul, 2026	Dipchand Nishar	Director	Acquired A	25,000	$0.00	$0	25,000	Direct
28 Jul, 2026	Nicolas H Phd Roelofs	Director	Acquired A	25,000	$0.00	$0	25,000	Direct
28 Jul, 2026	Terrance Mcguire	Director	Acquired A	25,000	$0.00	$0	25,000	Direct
08 Jul, 2026	Dipchand Nishar	Director	Disposed S	10,660	$2.18	$23.27K	59,044	Direct
20 May, 2026	David R. Horn	President Cfo	Disposed S	7,303	$1.69	$12.35K	493,959	Direct
08 May, 2026	Anthony R. Bazarko	Chief Commercial Officer	Acquired A	75,000	—	—	75,000	Direct
08 May, 2026	Anthony R. Bazarko	Chief Commercial Officer	Acquired A	225,000	$0.00	$0	225,000	Direct
18 Feb, 2026	David R. Horn	President Cfo	Disposed S	7,743	$1.99	$15.45K	501,262	Direct
18 Feb, 2026	Omid Farokhzad	Ceo And Chair	Disposed S	24,385	$1.99	$48.65K	3,349,064	Direct
03 Feb, 2026	Omid Farokhzad	Ceo And Chair	Acquired A	697,162	$0.00	$0	3,373,449	Direct

Showing 1 to 20 of 329 transactions