SEC ownership of STANDARD BIOTOOLS INC.

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001162194.

Comparable stake leader

Casdin Capital, LLC

Disclosed value leader

Casdin Partners Master Fund, L.P.

Comparable rows

50/50

Latest evidence

31 Mar 2026

Top shareholders Insider holders Latest transactions
Public ticker
LAB on Nasdaq
Parsed ownership sources
13D/G, 13F, and 3/4/5
Largest SEC-reported holder
Casdin Capital, LLC
Ownership snapshot CIK-linked ownership evidence from parsed SEC filings. 2 signals
Latest 13D/G holder
Casdin Capital, LLC
Latest parsed ownership date
31 Mar 2026
Issuer Names, identifiers, and filing context for this profile. 2 identity fields
Issuer CIK
0001162194
Issuer location
Boston, MA

Ownership snapshot

Top shareholders of STANDARD BIOTOOLS INC. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader
Casdin Capital, LLC
Disclosed value leader
Casdin Partners Master Fu...
Comparable rows
50/50
Latest evidence
31 Mar 2026
13D/G 13F 3/4/5 Lead comparable stake: 24% 13D/G row: Casdin Capital, LLC Showing 1-8 of 50 holder rows.

Quick read

Casdin Capital, LLC leads the comparable SEC ownership view at 24%.

50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Casdin Capital, LLC's linked filing trail.
Comparable ownership Top 5
Casdin Capital, LLC 24%
VIKING GLOBAL INVESTORS LP 15%
MAK Capital Fund LP 6.7%
Casdin Partners Master Fund, L.P. 19%
MAK CAPITAL ONE LLC 6.7%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-8 of 50 holder rows
Holder Evidence Ownership % Position 12M Net Δ As of
Casdin Capital, LLC
13D/G 13F
Eli Casdin · Company
13D/G 13F
24%
$107,459,205
93,442,787 shares
 +$14,465,243 25 Nov 2025
VIKING GLOBAL INVESTORS LP
13F 13D/G 3/4/5
Company · 10%+ Owner
13F 13D/G 3/4/5
15%
from 13D/G
$53,918,021
58,651,170 shares
 — 31 Mar 2026
MAK Capital Fund LP
13D/G
13D/G
6.7%
$23,293,637
26,172,626 shares
 +$5,522,504 31 Mar 2026
Casdin Partners Master Fund, L.P.
3/4/5
Director, 10%+ Owner
3/4/5
19%
$107,795,554
75,001,062 shares
 +$16,303,018 02 Dec 2025
MAK CAPITAL ONE LLC
13F
Company
13F
6.7%
$24,060,495
26,172,626 shares
 — 31 Mar 2026
BlackRock, Inc.
13F
Company
13F
6.3%
$22,758,269
24,756,084 shares
 — 31 Mar 2026
Long Focus Capital Management, LLC
13F
Company
13F
4.1%
$14,723,252
16,015,721 shares
 — 31 Mar 2026
VANGUARD CAPITAL MANAGEMENT LLC
13F
Company
13F
3.3%
$11,777,968
12,816,070 shares
 — 31 Mar 2026
How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

Net insider flow leans to buying over the last 12 months. Net value: +$16,303,018.

Buys
$16,303,018
Insiders: 1
Sells
$0
Insiders: 0
Net
+$16,303,018
Shares: +12,708,220
Window
Last 12 months
4 rolling buckets
Buy value Sell value
Shares: 12,708,220 Shares: 0
Window (months) Buy shares Sell shares Buy value Sell value Net value
0-3 0 0 $0 $0 $0
3-6 0 0 $0 $0 $0
6-9 11,325,000 0 $14,565,438 $0 +$14,565,438
9-12 1,383,220 0 $1,737,580 $0 +$1,737,580

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-20 of 28 reporting-owner rows connected to STANDARD BIOTOOLS INC.. Open a relationship link for the CIK-to-CIK filing trail.

Rows
28
Largest Forms 3/4/5 holder
Eli Casdin
Net 12M change
+$16,303,018
Latest report
20 May 2026
Name Relationship Holdings Value Past Year Net Change Change % Valuation Report Date
Eli Casdin Director, 10%+ Owner $113,818,299 Mixed 26 Feb 2026
Casdin Partners Master Fund, L.P. Director, 10%+ Owner $107,795,554 +$16,303,018 +18% Mixed 02 Dec 2025
VIKING GLOBAL INVESTORS LP 10%+ Owner $53,225,865 Mixed 18 Mar 2024
Caligan Partners LP 10%+ Owner $34,539,714 Mixed 29 Jun 2023
Michael Egholm President & CEO, Director $12,942,319 Mixed 20 May 2026
Hanjoon Alex Kim Chief Financial Officer $4,510,550 Mixed 20 May 2026
Jeffrey G. Black SVP & Chief Financial Officer $2,532,070 Mixed 20 Aug 2024
Sean Mackay SVP & Chief Business Officer $2,505,473 Mixed 20 May 2026
Casdin Amplify Fund, LP Director $1,117,250 Mixed 18 Jun 2024
Stephen Christopher Linthwaite President & CEO $1,004,213 Mixed 22 Feb 2022
Vikram Jog Chief Financial Officer $762,479 Mixed 21 Feb 2023
Troy Cox Director $710,682 Mixed 26 Feb 2026
Thomas D. Carey Director $692,160 Mixed 26 Feb 2026
Jeremy Steven Davis SVP Chief Commercial Officer $667,438 Mixed 21 Feb 2023
Fenel M. Eloi Director $520,430 Mixed 20 Jun 2025
Nicolas Barthelemy Director $518,356 Mixed 01 Apr 2022
Frank Witney Director $498,068 Mixed 20 Jun 2025
Carlos V Paya MD Director $454,505 Mixed 14 Jun 2023
Kathy L. Hibbs Director $416,060 Mixed 20 Jun 2025
Gerhard F. Burbach Director $405,157 Mixed 15 Jun 2022

Recent insider transactions for STANDARD BIOTOOLS INC.

Showing up to 300 recent insider transactions from the last 12 months.

Insider Symbol Class Transaction % SEC-reported value SEC-reported price Shares Shares owned Date Ownership
Hanjoon Alex Kim LAB Common Stock Tax liability -0.68% -18,871 2,760,530 20 May 2026 Direct
Sean Mackay LAB Common Stock Tax liability -2.49% -25,729 1,006,552 20 May 2026 Direct
Michael Egholm LAB Common Stock Tax liability -1.46% -97,626 6,597,956 20 May 2026 Direct
Michael Egholm LAB Common Stock Tax liability -1.4% -95,014 6,695,582 06 Apr 2026 Direct
Michael Egholm LAB Common Stock Options Exercise 2.98% 196,513 6,790,596 06 Apr 2026 Direct
Michael Egholm LAB Restricted Stock Units Options Exercise -100% -196,513 0 06 Apr 2026 Direct
Hanjoon Alex Kim LAB Common Stock Tax liability -0.76% -21,301 2,779,401 06 Apr 2026 Direct
Hanjoon Alex Kim LAB Common Stock Options Exercise 2.57% 70,183 2,800,702 06 Apr 2026 Direct
Hanjoon Alex Kim LAB Restricted Stock Units Options Exercise -100% -70,183 0 06 Apr 2026 Direct
Michael Egholm LAB Common Stock Award 18.8% 1,042,373 6,594,083 20 Mar 2026 Direct
Michael Egholm LAB Stock Option (Right to buy) Award 2,345,340 2,345,340 20 Mar 2026 Direct
Sean Mackay LAB Common Stock Award 35.8% 272,107 1,032,281 20 Mar 2026 Direct
Sean Mackay LAB Stock Option (Right to buy) Award 612,240 612,240 20 Mar 2026 Direct
Hanjoon Alex Kim LAB Common Stock Award 13.4% 323,173 2,730,519 20 Mar 2026 Direct
Hanjoon Alex Kim LAB Stock Option (Right to buy) Award 727,140 727,140 20 Mar 2026 Direct
Eli Casdin LAB Common Stock Award 1.83% 52,991 2,954,053 26 Feb 2026 Direct
Troy Cox LAB Common Stock Award 17.9% 57,264 376,586 26 Feb 2026 Direct
Thomas D. Carey LAB Common Stock Award 26.4% 51,282 245,340 26 Feb 2026 Direct
Michael Egholm LAB Common Stock Tax liability -1.18% -66,127 5,551,710 23 Feb 2026 Direct
Sean Mackay LAB Common Stock Tax liability -2.52% -19,661 760,174 23 Feb 2026 Direct
Hanjoon Alex Kim LAB Common Stock Tax liability -0.53% -12,740 2,407,346 23 Feb 2026 Direct
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.21% $217,020 $1.45 150,000 72,100,000 04 Dec 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.1% $108,038 $1.44 75,000 71,950,000 03 Dec 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.17% $177,512 $1.42 125,000 71,875,000 02 Dec 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 11.8% $9,838,405 $1.30 7,550,000 71,750,000 25 Nov 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.23% $214,875 $1.43 150,000 64,200,000 24 Nov 2025 See footnote
Michael Egholm LAB Common Stock Tax liability -1.12% -63,529 5,617,837 20 Nov 2025 Direct
Hanjoon Alex Kim LAB Common Stock Tax liability -0.52% -12,739 2,415,086 20 Nov 2025 Direct
Sean Mackay LAB Common Stock Tax liability -2.46% -19,661 779,835 20 Nov 2025 Direct
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.71% $586,260 $1.30 450,000 64,050,000 20 Nov 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.55% $448,910 $1.28 350,000 63,600,000 19 Nov 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.44% $339,405 $1.23 275,000 63,250,000 18 Nov 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.36% $275,580 $1.22 225,000 62,975,000 17 Nov 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.4% $309,800 $1.24 250,000 62,750,000 14 Nov 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.73% $541,395 $1.20 450,000 62,500,000 13 Nov 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.61% $445,838 $1.19 375,000 62,050,000 12 Nov 2025 See Footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.49% $358,800 $1.20 300,000 61,675,000 11 Nov 2025 See Footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.45% $321,915 $1.17 275,000 61,375,000 10 Nov 2025 See Footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.37% $252,765 $1.12 225,000 61,100,000 07 Nov 2025 See Footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.16% $128,920 $1.29 100,000 60,875,000 09 Sep 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.41% $319,350 $1.28 250,000 60,775,000 04 Sep 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.41% $316,400 $1.27 250,000 60,525,000 03 Sep 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.21% $157,938 $1.26 125,000 60,275,000 26 Aug 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.33% $248,180 $1.24 200,000 60,150,000 25 Aug 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock, $0.001 par value per share Purchase 0.33% $252,680 $1.26 200,000 59,950,000 22 Aug 2025 See footnote
Michael Egholm LAB Common Stock Tax liability -0.96% -54,919 5,681,366 20 Aug 2025 Direct
Sean Mackay LAB Common Stock Tax liability -2.4% -19,661 799,496 20 Aug 2025 Direct
Hanjoon Alex Kim LAB Common Stock Tax liability -0.52% -12,739 2,427,825 20 Aug 2025 Direct
Casdin Partners Master Fund, L.P. LAB Common Stock Purchase 0.25% $183,210 $1.22 150,000 59,750,000 15 Aug 2025 See footnote
Casdin Partners Master Fund, L.P. LAB Common Stock Purchase 0.22% $161,543 $1.21 133,220 59,600,000 14 Aug 2025 See footnote
* marks a reported price that did not pass the local price check.
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