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 |
Alphabet (Google) Class C
GOOG
|
+$54.6M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$52.5M |
| 3 |
SPDR S&P 500 ETF Trust
SPY
|
+$40.9M |
| 4 |
Apple
AAPL
|
+$16.5M |
| 5 |
Visa
V
|
+$12M |
Top Sells
| 1 |
Amazon
AMZN
|
+$98.7M |
| 2 |
Meta Platforms (Facebook)
META
|
+$70.7M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$33.4M |
| 4 |
Goldman Sachs
GS
|
+$30.2M |
| 5 |
Boeing
BA
|
+$26.5M |
Sector Composition
| 1 | Communication Services | 14.71% |
| 2 | Consumer Discretionary | 14.32% |
| 3 | Technology | 11.86% |
| 4 | Financials | 7.38% |
| 5 | Industrials | 6.44% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
|
XIFR
976
XPLR Infrastructure, LP
XIFR
$949M
| $68K | ﹤0.01% |
+1,588
| New | +$68K |
|
|
ATTU
977
DELISTED
Attunity Ltd
ATTU
| $68K | ﹤0.01% |
3,504
-17,207
| -83% | -$334K |
|
978
NatWest
NWG
$58B
| $67K | ﹤0.01% |
11,271
+9,300
| +472% | +$55.3K |
|
979
Viasat
VSAT
$4.28B
| $67K | ﹤0.01% |
+1,139
| New | +$67K |
|
980
Olympic Steel
ZEUS
$378M
| $67K | ﹤0.01% |
+4,739
| New | +$67K |
|
|
ARCH
981
DELISTED
Arch Resources, Inc.
ARCH
| $67K | ﹤0.01% |
+817
| New | +$67K |
|
982
Amneal Pharmaceuticals
AMRX
$3.17B
| $66K | ﹤0.01% |
4,920
-22,485
| -82% | -$302K |
|
|
HIMX
983
Himax Technologies
HIMX
$1.45B
| $66K | ﹤0.01% |
19,336
-5,890
| -23% | -$20.1K |
|
|
SMC
984
Summit Midstream Corporation
SMC
$286M
| $66K | ﹤0.01% |
+442
| New | +$66K |
|
|
CDMO
985
DELISTED
Avid Bioservices, Inc. Common Stock
CDMO
| $66K | ﹤0.01% |
16,180
-24,644
| -60% | -$101K |
|
|
FPRX
986
DELISTED
Five Prime Therapeutics, Inc.
FPRX
| $66K | ﹤0.01% |
7,119
-5,264
| -43% | -$48.8K |
|
|
AMID
987
DELISTED
American Midstream Partners, LP
AMID
| $66K | ﹤0.01% |
21,967
+16,174
| +279% | +$48.6K |
|
988
Globus Medical
GMED
$8.05B
| $65K | ﹤0.01% |
+1,514
| New | +$65K |
|
989
Companhia Siderúrgica Nacional
SID
$1.99B
| $65K | ﹤0.01% |
29,864
+14,374
| +93% | +$31.3K |
|
990
Alaunos Therapeutics
TCRT
$5.25M
| $65K | ﹤0.01% |
232
-193
| -45% | -$54.1K |
|
|
CTB
991
DELISTED
Cooper Tire & Rubber Co.
CTB
| $65K | ﹤0.01% |
2,025
-4,287
| -68% | -$138K |
|
|
AEGN
992
DELISTED
Aegion Corp
AEGN
| $65K | ﹤0.01% |
+4,025
| New | +$65K |
|
|
GCI
993
DELISTED
Gannett Co., Inc
GCI
| $65K | ﹤0.01% |
7,731
-3,460
| -31% | -$29.1K |
|
|
UXIN
994
Uxin Ltd
UXIN
$744M
| $64K | ﹤0.01% |
+132
| New | +$64K |
|
|
HSTO
995
DELISTED
Histogen Inc. Common Stock
HSTO
| $64K | ﹤0.01% |
186
+134
| +258% | +$46.1K |
|
996
Clean Harbors
CLH
$12.8B
| $63K | ﹤0.01% |
1,283
-12,527
| -91% | -$615K |
|
997
Dycom Industries
DY
$7.49B
| $63K | ﹤0.01% |
1,177
-93
| -7% | -$4.98K |
|
998
Q2 Holdings
QTWO
$5.17B
| $63K | ﹤0.01% |
+1,280
| New | +$63K |
|
|
TERP
999
DELISTED
TerraForm Power, Inc
TERP
| $63K | ﹤0.01% |
5,674
-17,066
| -75% | -$189K |
|
1000
Clearway Energy Class A
CWEN.A
$3.21B
| $62K | ﹤0.01% |
+3,722
| New | +$62K |
|