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
|
+$41.4M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.3M |
| 3 |
SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 4 |
Alibaba
BABA
|
+$9.66M |
| 5 |
Intel
INTC
|
+$9.11M |
Top Sells
| 1 |
Apple
AAPL
|
+$36.8M |
| 2 |
Gilead Sciences
GILD
|
+$31.2M |
| 3 |
Booking.com
BKNG
|
+$29M |
| 4 |
Amazon
AMZN
|
+$25.6M |
| 5 |
Baidu
BIDU
|
+$12.9M |
Sector Composition
| 1 | Communication Services | 13.31% |
| 2 | Consumer Discretionary | 13.07% |
| 3 | Healthcare | 12.41% |
| 4 | Technology | 11.91% |
| 5 | Financials | 8.28% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
451
Gannett
GCI
$610M
| $184K | 0.02% |
+7,705
| New | +$184K |
|
452
Financial Select Sector SPDR Fund
XLF
$53.2B
| $184K | 0.02% |
+8,732
| New | +$184K |
|
|
ANSS
453
DELISTED
Ansys
ANSS
| $183K | 0.02% |
+2,076
| New | +$183K |
|
454
CarMax
KMX
$9.21B
| $181K | 0.02% |
+2,625
| New | +$181K |
|
455
Sumitomo Mitsui Financial
SMFG
$107B
| $181K | 0.02% |
+23,400
| New | +$181K |
|
456
Tempest Therapeutics
TPST
$48.2M
| $181K | 0.02% |
+2
| New | +$181K |
|
|
TSRO
457
DELISTED
TESARO, Inc.
TSRO
| $181K | 0.02% |
3,157
+1,440
| +84% | +$82.6K |
|
458
Xoma
XOMA
$427M
| $180K | 0.02% |
2,476
+1,547
| +167% | +$112K |
|
|
ENLC
459
DELISTED
ENLINK MIDSTREAM, LLC
ENLC
| $180K | 0.02% |
+5,533
| New | +$180K |
|
|
TSL
460
DELISTED
Trina Solar Limited
TSL
| $180K | 0.02% |
14,913
+9,258
| +164% | +$112K |
|
461
Motorola Solutions
MSI
$79.7B
| $179K | 0.02% |
+2,697
| New | +$179K |
|
|
MEG
462
DELISTED
Media General, Inc
MEG
| $178K | 0.02% |
+10,839
| New | +$178K |
|
|
DRC
463
DELISTED
DRESSER-RAND GROUP INC
DRC
| $177K | 0.02% |
2,208
-5,061
| -70% | -$406K |
|
|
ARP
464
DELISTED
ATLAS RESOURCE PARTNERS L P COM UIT REPSTG LTD PTNRS
ARP
| $176K | 0.02% |
22,949
+21,820
| +1,933% | +$167K |
|
465
Dillards
DDS
$9.02B
| $175K | 0.02% |
1,286
-88
| -6% | -$12K |
|
466
ProShares Ultra Energy
DIG
$69.2M
| $174K | 0.02% |
2,749
+2,307
| +522% | +$146K |
|
467
Plains All American Pipeline
PAA
$12.1B
| $174K | 0.02% |
3,572
+2,606
| +270% | +$127K |
|
468
Upbound Group
UPBD
$1.47B
| $173K | 0.02% |
6,311
+5,644
| +846% | +$155K |
|
469
Barrett Business Services
BBSI
$1.22B
| $170K | 0.02% |
15,876
+15,780
| +16,438% | +$169K |
|
470
IPG Photonics
IPGP
$3.5B
| $170K | 0.02% |
+1,842
| New | +$170K |
|
|
VNET
471
VNET Group
VNET
$2.07B
| $170K | 0.02% |
9,641
-4,946
| -34% | -$87.2K |
|
|
SCMP
472
DELISTED
Sucampo Pharmaceuticals, Inc.
SCMP
| $170K | 0.02% |
10,938
+10,109
| +1,219% | +$157K |
|
473
Honda
HMC
$45.5B
| $169K | 0.02% |
5,161
+3,396
| +192% | +$111K |
|
474
Chubb
CB
$111B
| $168K | 0.02% |
+1,511
| New | +$168K |
|
475
Seagate
STX
$40.2B
| $166K | 0.02% |
3,196
+3,167
| +10,921% | +$164K |
|