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 | |
|---|---|---|---|---|---|---|
|
TW
376
DELISTED
TOWERS WATSON & CO COM STK CL A (DE)
TW
| $247K | 0.03% |
+1,870
| New | +$247K |
|
377
Sarepta Therapeutics
SRPT
$1.96B
| $246K | 0.03% |
18,578
-10,453
| -36% | -$138K |
|
378
CRH
CRH
$75.4B
| $245K | 0.03% |
+9,378
| New | +$245K |
|
|
SEMG
379
DELISTED
SEMGROUP CORPORATION
SEMG
| $245K | 0.03% |
+3,023
| New | +$245K |
|
380
Southern Company
SO
$101B
| $244K | 0.03% |
+5,531
| New | +$244K |
|
381
Stryker
SYK
$150B
| $244K | 0.03% |
+2,645
| New | +$244K |
|
382
3D Systems Corporation
DDD
$272M
| $242K | 0.03% |
+8,827
| New | +$242K |
|
383
ING
ING
$71B
| $242K | 0.03% |
16,589
+16,399
| +8,631% | +$239K |
|
384
HDFC Bank
HDB
$361B
| $241K | 0.03% |
8,212
-3,934
| -32% | -$115K |
|
385
MGM Resorts International
MGM
$9.98B
| $241K | 0.03% |
11,464
-7,572
| -40% | -$159K |
|
386
PRA Group
PRAA
$671M
| $240K | 0.03% |
4,424
+3,345
| +310% | +$181K |
|
387
Sealed Air
SEE
$4.82B
| $240K | 0.03% |
+5,279
| New | +$240K |
|
|
CEMP
388
DELISTED
Cempra, Inc.
CEMP
| $239K | 0.03% |
6,975
-3,296
| -32% | -$113K |
|
389
Loews
L
$20B
| $238K | 0.03% |
5,831
+5,805
| +22,327% | +$237K |
|
390
Banco Bradesco
BBD
$33.6B
| $237K | 0.03% |
+54,516
| New | +$237K |
|
391
NiSource
NI
$19B
| $237K | 0.03% |
+13,664
| New | +$237K |
|
|
EIGR
392
DELISTED
Eiger BioPharmaceuticals, Inc.
EIGR
| $237K | 0.03% |
+28
| New | +$237K |
|
393
Merck
MRK
$212B
| $236K | 0.03% |
4,304
-11,694
| -73% | -$641K |
|
394
Urban Outfitters
URBN
$6.35B
| $236K | 0.03% |
5,190
-16,393
| -76% | -$745K |
|
395
Western Union
WU
$2.86B
| $233K | 0.03% |
11,208
+9,316
| +492% | +$194K |
|
396
Tower Semiconductor
TSEM
$7.07B
| $232K | 0.03% |
+13,678
| New | +$232K |
|
397
Vanguard Health Care ETF
VHT
$15.7B
| $232K | 0.03% |
1,714
-2,108
| -55% | -$285K |
|
398
DTE Energy
DTE
$28.4B
| $230K | 0.03% |
+3,358
| New | +$230K |
|
399
Mondelez International
MDLZ
$79.9B
| $230K | 0.03% |
+6,386
| New | +$230K |
|
400
Cemex
CX
$13.6B
| $229K | 0.03% |
+27,255
| New | +$229K |
|