Institutional Manager · CIK 0001738902

Atom Investors LP

AUSTIN, TX · File #028-19354

Latest AUM

$1.26B

Positions

556

Top-10 Concentration

34.2%

Filings

Portfolio Value Over Time

2024-03

2024-06

2024-09

2024-12

2025-03

2025-06

2025-09

2025-12

Biggest QoQ Changes

Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.

Action	Issuer	Ticker / CUSIP	Δ Shares	Flow ($)	Price Effect
EXITED	ISHARES TR	464287655	-404,557	-$97.9M	$0
REDUCE	SPDR S&P 500 ETF TR	SPY	-99,546	-$67.9M	+$1.6M
NEW	VANGUARD INDEX FDS	922908363	+67,041	+$42.0M	$0
REDUCE	ISHARES TR	464287630	-223,908	-$40.6M	+$1.0M
NEW	BIO-TECHNE CORP	TECH	+351,673	+$20.7M	$0
REDUCE	SPDR SERIES TRUST	78464A714	-232,391	-$19.8M	-$211,643
REDUCE	SELECT SECTOR SPDR TR	81369Y605	-328,203	-$18.0M	+$301,639
EXITED	INVESCO QQQ TR	46090E103	-26,313	-$15.8M	$0
ADD	SITEONE LANDSCAPE SUPPLY	SITE	+118,924	+$14.8M	-$29,108
REDUCE	SPDR SERIES TRUST	78464A870	-119,886	-$14.6M	+$2.7M

Sector Allocation

Healthcare

15.3%$192.5M

Technology

11.4%$143.5M

Industrials

10.8%$136.7M

Consumer Discretionary

10.6%$133.3M

4.6%$58.5M

3.9%$49.7M

3.6%$45.9M

3.1%$38.9M

Communication Services

1.5%$19.5M

Utilities

1.4%$17.4M

Real Estate

0.8%$10.1M

Filing History

Feb 17, 202613F HOLDINGS REPORTQ/E Dec 2025556 pos · $1.26B
Nov 14, 202513F HOLDINGS REPORTQ/E Sep 2025584 pos · $1.32B
Aug 14, 202513F HOLDINGS REPORTQ/E Jun 2025587 pos · $1.13B
May 15, 202513F HOLDINGS REPORTQ/E Mar 2025488 pos · $812.9M
Feb 14, 202513F HOLDINGS REPORTQ/E Dec 2024481 pos · $805.0M
Nov 14, 202413F HOLDINGS REPORTQ/E Sep 2024456 pos · $955.2M
Aug 14, 202413F HOLDINGS REPORTQ/E Jun 2024457 pos · $1.00B
May 15, 202413F HOLDINGS REPORTQ/E Mar 2024564 pos · $801.5M
Nov 14, 202313F HOLDINGS REPORTQ/E Dec 2023421 pos · $438.6M

Top 20 Holdings — Dec 2025

#	Issuer	Ticker	Shares	Value	% of Portfolio
1	VANGUARD INDEX FDS	922908363	67,041	$42.0M	8.78%
2	BIO-TECHNE CORP	TECH	351,673	$20.7M	4.32%
3	SITEONE LANDSCAPE SUPPLY	SITE	125,789	$15.7M	3.27%
4	APOLLO GLOBAL MGMT INC	03769M106	101,853	$14.7M	3.08%
5	SALESFORCE INC	CRM	52,870	$14.0M	2.92%
6	CASELLA WASTE SYS INC	CWST	122,675	$12.0M	2.51%
7	SELECT SECTOR SPDR TR	81369Y886	266,557	$11.4M	2.38%
8	SELECT SECTOR SPDR TR	81369Y308	143,951	$11.2M	2.33%
9	ISHARES TR	46429B697	118,443	$11.2M	2.33%
10	SELECT SECTOR SPDR TR	81369Y209	71,941	$11.1M	2.33%
11	GOLAR LNG LTD	GLNG	282,305	$10.5M	2.19%
12	ASTRONICS CORP	ATROB	188,492	$10.2M	2.13%
13	F5 INC	FFIV	40,011	$10.2M	2.13%
14	SELECT SECTOR SPDR TR	81369Y860	252,322	$10.2M	2.13%
15	SHERWIN WILLIAMS CO	SHW	30,401	$9.9M	2.06%
16	RESOLUTE HLDGS MGMT INC	76134H101	47,250	$9.8M	2.04%
17	LIBERTY ENERGY INC	LBRT	513,742	$9.5M	1.98%
18	PHINIA INC	PHIN	149,138	$9.3M	1.95%
19	CSX CORP	CSX	257,834	$9.3M	1.95%
20	COHU INC	COHU	400,439	$9.3M	1.95%