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 | |
|---|---|---|---|---|---|---|
676
Dentsply Sirona
XRAY
$2.73B
| $175K | ﹤0.01% |
4,722
+1,583
| +50% | +$58.7K |
|
|
RHT
677
DELISTED
Red Hat Inc
RHT
| $175K | ﹤0.01% |
1,000
-34,681
| -97% | -$6.07M |
|
678
Donnelley Financial Solutions
DFIN
$1.49B
| $174K | ﹤0.01% |
12,471
+4,822
| +63% | +$67.3K |
|
679
ITT
ITT
$13.6B
| $174K | ﹤0.01% |
+3,623
| New | +$174K |
|
680
MACOM Technology Solutions
MTSI
$9.81B
| $174K | ﹤0.01% |
12,050
-1,939
| -14% | -$28K |
|
681
National Health Investors
NHI
$3.71B
| $173K | ﹤0.01% |
+2,300
| New | +$173K |
|
682
Newmark Group
NMRK
$3.33B
| $173K | ﹤0.01% |
21,616
+19,874
| +1,141% | +$159K |
|
683
Carnival PLC
CUK
$37.5B
| $172K | ﹤0.01% |
+3,543
| New | +$172K |
|
|
HUYA
684
Huya Inc
HUYA
$740M
| $172K | ﹤0.01% |
+11,168
| New | +$172K |
|
685
The Communication Services Select Sector SPDR Fund
XLC
$26.1B
| $172K | ﹤0.01% |
4,180
-7,255
| -63% | -$299K |
|
|
HA
686
DELISTED
Hawaiian Holdings, Inc.
HA
| $172K | ﹤0.01% |
+6,538
| New | +$172K |
|
|
PEI
687
DELISTED
Pennsylvania Real Estate Investment Trust
PEI
| $172K | ﹤0.01% |
1,936
+1,925
| +17,500% | +$171K |
|
688
Telecom Argentina
TEO
$3.26B
| $171K | ﹤0.01% |
11,047
-64,460
| -85% | -$998K |
|
|
GMLP
689
DELISTED
Golar LNG Partners LP
GMLP
| $171K | ﹤0.01% |
15,866
-8,968
| -36% | -$96.7K |
|
690
Core Laboratories
CLB
$577M
| $170K | ﹤0.01% |
+2,857
| New | +$170K |
|
691
Motorola Solutions
MSI
$80.3B
| $170K | ﹤0.01% |
+1,481
| New | +$170K |
|
692
Steris
STE
$24B
| $170K | ﹤0.01% |
1,593
-81
| -5% | -$8.64K |
|
693
Amphenol
APH
$145B
| $169K | ﹤0.01% |
8,352
-19,236
| -70% | -$389K |
|
694
Karyopharm Therapeutics
KPTI
$53.8M
| $169K | ﹤0.01% |
1,205
+1,113
| +1,210% | +$156K |
|
695
ScottsMiracle-Gro
SMG
$3.5B
| $169K | ﹤0.01% |
2,762
-8,319
| -75% | -$509K |
|
696
Stagwell
STGW
$1.39B
| $169K | ﹤0.01% |
+64,818
| New | +$169K |
|
|
GLIBA
697
DELISTED
GCI Liberty, Inc. Class A Common Stock (DE)
GLIBA
| $169K | ﹤0.01% |
4,117
-4,453
| -52% | -$183K |
|
|
TVPT
698
DELISTED
Travelport Worldwide Limited
TVPT
| $169K | ﹤0.01% |
+10,822
| New | +$169K |
|
|
ARRY
699
DELISTED
Array Biopharma Inc
ARRY
| $168K | ﹤0.01% |
11,808
+1,045
| +10% | +$14.9K |
|
700
Fidelity National Information Services
FIS
$34.7B
| $167K | ﹤0.01% |
1,630
-6,968
| -81% | -$714K |
|