Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| 1 |
SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$32.1M |
| 2 |
PARA
Paramount Global Class B
PARA
|
+$23.3M |
| 3 |
Pinduoduo
PDD
|
+$17.3M |
| 4 |
Pfizer
PFE
|
+$16.8M |
| 5 |
American Airlines Group
AAL
|
+$14.5M |
Top Sells
| 1 |
Amazon
AMZN
|
+$64.4M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 3 |
AutoZone
AZO
|
+$32.2M |
| 4 |
SPDR S&P 500 ETF Trust
SPY
|
+$25.3M |
| 5 |
Apple
AAPL
|
+$22.5M |
Sector Composition
| 1 | Technology | 20.25% |
| 2 | Consumer Discretionary | 15.22% |
| 3 | Healthcare | 10.03% |
| 4 | Financials | 9.2% |
| 5 | Industrials | 9.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
901
iShares Russell Mid-Cap Growth ETF
IWP
$20.5B
| $304K | ﹤0.01% |
+2,987
| New | +$304K |
|
902
Resideo Technologies
REZI
$5.39B
| $303K | ﹤0.01% |
+10,752
| New | +$303K |
|
903
IZEA Worldwide
IZEA
$63.1M
| $302K | ﹤0.01% |
+20,027
| New | +$302K |
|
904
SiriusXM
SIRI
$8.02B
| $301K | ﹤0.01% |
4,950
-2,037
| -29% | -$124K |
|
905
ADMA Biologics
ADMA
$3.76B
| $299K | ﹤0.01% |
+170,364
| New | +$299K |
|
906
Alaunos Therapeutics
TCRT
$4.83M
| $299K | ﹤0.01% |
555
+281
| +103% | +$151K |
|
907
Danaher
DHR
$138B
| $298K | ﹤0.01% |
1,495
-12,090
| -89% | -$2.41M |
|
908
Viavi Solutions
VIAV
$2.66B
| $298K | ﹤0.01% |
19,040
+17,160
| +913% | +$269K |
|
909
Carpenter Technology
CRS
$12.3B
| $296K | ﹤0.01% |
7,197
-4,786
| -40% | -$197K |
|
910
Kartoon Studios
TOON
$38.3M
| $296K | ﹤0.01% |
15,297
+15,044
| +5,946% | +$291K |
|
911
Toyota
TM
$257B
| $293K | ﹤0.01% |
+1,883
| New | +$293K |
|
912
Westwater Resources
WWR
$59.8M
| $292K | ﹤0.01% |
+54,427
| New | +$292K |
|
913
CuriosityStream
CURI
$258M
| $291K | ﹤0.01% |
+21,477
| New | +$291K |
|
914
iHeartMedia
IHRT
$323M
| $291K | ﹤0.01% |
16,087
-17,605
| -52% | -$318K |
|
915
Relmada Therapeutics
RLMD
$53.4M
| $290K | ﹤0.01% |
+8,243
| New | +$290K |
|
916
Green Brick Partners
GRBK
$3.17B
| $289K | ﹤0.01% |
12,755
+9,110
| +250% | +$206K |
|
917
Keysight
KEYS
$29.3B
| $289K | ﹤0.01% |
+2,020
| New | +$289K |
|
|
MRTX
918
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $289K | ﹤0.01% |
+1,692
| New | +$289K |
|
919
Hancock Whitney
HWC
$5.35B
| $288K | ﹤0.01% |
+6,864
| New | +$288K |
|
920
American Axle
AXL
$704M
| $286K | ﹤0.01% |
29,657
+10,497
| +55% | +$101K |
|
921
DMC Global
BOOM
$141M
| $285K | ﹤0.01% |
+5,257
| New | +$285K |
|
922
Liquidity Services
LQDT
$845M
| $285K | ﹤0.01% |
15,358
-352
| -2% | -$6.53K |
|
923
Siren ETF Trust Siren Nasdaq NexGen Economy ETF
BLCN
$47.5M
| $284K | ﹤0.01% |
5,910
-1,445
| -20% | -$69.4K |
|
924
KKR & Co
KKR
$124B
| $282K | ﹤0.01% |
5,790
-19,227
| -77% | -$936K |
|
925
VanEck Agribusiness ETF
MOO
$623M
| $282K | ﹤0.01% |
3,223
+1,032
| +47% | +$90.3K |
|