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 |
Amazon
AMZN
|
+$158M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$69.1M |
| 3 |
Meta Platforms (Facebook)
META
|
+$57.4M |
| 4 |
Citigroup
C
|
+$23.4M |
| 5 |
Goldman Sachs
GS
|
+$23M |
Top Sells
| 1 |
Apple
AAPL
|
+$49.8M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$43.2M |
| 3 |
SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$42.2M |
| 4 |
Micron Technology
MU
|
+$26.1M |
| 5 |
Adobe
ADBE
|
+$21M |
Sector Composition
| 1 | Consumer Discretionary | 20.63% |
| 2 | Communication Services | 16.3% |
| 3 | Technology | 12.42% |
| 4 | Industrials | 9.24% |
| 5 | Healthcare | 8.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
801
MillerKnoll
MLKN
$1.44B
| $183K | ﹤0.01% |
+4,768
| New | +$183K |
|
|
MIME
802
DELISTED
Mimecast Limited
MIME
| $183K | ﹤0.01% |
+4,390
| New | +$183K |
|
803
Cantaloupe
CTLP
$792M
| $182K | ﹤0.01% |
25,351
+16,664
| +192% | +$120K |
|
804
Bilibili
BILI
$10.1B
| $181K | ﹤0.01% |
13,438
+8,548
| +175% | +$115K |
|
805
East-West Bancorp
EWBC
$15.1B
| $181K | ﹤0.01% |
3,011
+2,863
| +1,934% | +$172K |
|
|
STAY
806
DELISTED
Extended Stay America, Inc. Paired Share Unit
STAY
| $181K | ﹤0.01% |
8,965
-13,093
| -59% | -$264K |
|
|
PRCP
807
DELISTED
Perceptron Inc
PRCP
| $181K | ﹤0.01% |
18,611
+18,559
| +35,690% | +$180K |
|
808
Xylem
XYL
$34.5B
| $180K | ﹤0.01% |
+2,256
| New | +$180K |
|
|
LLL
809
DELISTED
L3 Technologies, Inc.
LLL
| $180K | ﹤0.01% |
848
-2,640
| -76% | -$560K |
|
|
CRON
810
Cronos Group
CRON
$988M
| $179K | ﹤0.01% |
+16,110
| New | +$179K |
|
|
MXWL
811
DELISTED
Maxwell Technologies Inc
MXWL
| $179K | ﹤0.01% |
51,318
+26,309
| +105% | +$91.8K |
|
812
iShares US Medical Devices ETF
IHI
$4.31B
| $178K | ﹤0.01% |
4,716
-1,458
| -24% | -$55K |
|
813
Koppers
KOP
$570M
| $178K | ﹤0.01% |
5,724
+4,612
| +415% | +$143K |
|
|
PENG
814
Penguin Solutions, Inc. Ordinary Shares
PENG
$1.37B
| $178K | ﹤0.01% |
12,422
+11,462
| +1,194% | +$164K |
|
|
CTB
815
DELISTED
Cooper Tire & Rubber Co.
CTB
| $178K | ﹤0.01% |
6,312
-3,044
| -33% | -$85.8K |
|
816
BorgWarner
BWA
$9.6B
| $177K | ﹤0.01% |
+4,703
| New | +$177K |
|
817
Sempra
SRE
$54.5B
| $177K | ﹤0.01% |
3,124
-4,852
| -61% | -$275K |
|
818
Corbus Pharmaceuticals
CRBP
$116M
| $176K | ﹤0.01% |
+781
| New | +$176K |
|
819
iShares S&P 500 Value ETF
IVE
$41.3B
| $176K | ﹤0.01% |
+1,521
| New | +$176K |
|
|
NSTG
820
DELISTED
NanoString Technologies, Inc.
NSTG
| $176K | ﹤0.01% |
9,897
+5,631
| +132% | +$100K |
|
821
Apogee Enterprises
APOG
$941M
| $175K | ﹤0.01% |
4,258
+1,870
| +78% | +$76.9K |
|
822
AXT Inc
AXTI
$156M
| $175K | ﹤0.01% |
24,572
+14,395
| +141% | +$103K |
|
823
CNA Financial
CNA
$13B
| $175K | ﹤0.01% |
3,843
+267
| +7% | +$12.2K |
|
824
Middleby
MIDD
$7.03B
| $175K | ﹤0.01% |
1,356
+552
| +69% | +$71.2K |
|
825
Altice USA
ATUS
$1.14B
| $174K | ﹤0.01% |
9,616
+7,842
| +442% | +$142K |
|