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
| Rank | Stock | Value |
|---|---|---|
| 1 |
Gilead Sciences
GILD
|
+$33M |
| 2 |
Apple
AAPL
|
+$32.5M |
| 3 |
Booking.com
BKNG
|
+$28.7M |
| 4 |
Amazon
AMZN
|
+$25.7M |
| 5 |
Baidu
BIDU
|
+$16.3M |
Top Sells
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 13.8% |
| 2 | Technology | 11.13% |
| 3 | Healthcare | 8.34% |
| 4 | Energy | 5.42% |
| 5 | Communication Services | 4.79% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
X
926
CALL
DELISTED
US Steel
X
| $94K | 0.01% |
+1,421
| New | +$47.4K |
|
927
American Eagle Outfitters
AEO
$2.85B
| $93K | 0.01% |
+6,722
| New | +$90.9K |
|
928
PUT
Antero Resources
AR
$10.9B
| $93K | 0.01% |
+173
| New | +$8.29K |
|
929
Avnet
AVT
$7.33B
| $93K | 0.01% |
+2,167
| New | +$91.8K |
|
930
CALL
Celldex Therapeutics
CLDX
$2.77B
| $93K | 0.01% |
+22
| New | +$5.47K |
|
931
PUT
GE Aerospace
GE
$367B
| $93K | 0.01% |
+208
| New | +$25.6K |
|
|
HES
932
CALL
DELISTED
Hess
HES
| $93K | 0.01% |
+509
| New | +$40.3K |
|
933
NextEra Energy
NEE
$187B
| $93K | 0.01% |
+3,496
| New | +$88.3K |
|
934
State Street SPDR S&P Bank ETF
KBE
$1.64B
| $92K | 0.01% |
+2,728
| New | +$89K |
|
935
CALL
KLA
KLAC
$275B
| $92K | 0.01% |
+1,010
| New | +$7.46K |
|
936
PUT
MannKind Corp
MNKD
$1.28B
| $92K | 0.01% |
+52
| New | +$1.47K |
|
937
Netflix
NFLX
$292B
| $92K | 0.01% |
+18,900
| New | +$101K |
|
938
CALL
VF Corp
VFC
$6.68B
| $92K | 0.01% |
+158
| New | +$10.5K |
|
|
SDRL
939
CALL
DELISTED
Seadrill Limited Common Stock
SDRL
| $92K | 0.01% |
+4
| New | +$20.1K |
|
|
HAR
940
DELISTED
Harman International Industries
HAR
| $92K | 0.01% |
+866
| New | +$89.2K |
|
941
Aramark
ARMK
$15B
| $91K | 0.01% |
+4,057
| New | +$82.9K |
|
942
Cimpress
CMPR
$2.37B
| $91K | 0.01% |
+1,221
| New | +$79.2K |
|
943
CALL
Devon Energy
DVN
$51.9B
| $91K | 0.01% |
+635
| New | +$38.5K |
|
944
PUT
Newmont
NEM
$99.5B
| $91K | 0.01% |
+386
| New | +$7.77K |
|
945
PUT
Starbucks
SBUX
$118B
| $90K | 0.01% |
+546
| New | +$21.3K |
|
946
Invesco Solar ETF
TAN
$1.47B
| $90K | 0.01% |
+2,637
| New | +$94.5K |
|
947
TriNet
TNET
$2.84B
| $90K | 0.01% |
+2,877
| New | +$84.7K |
|
|
EXPR
948
DELISTED
Express, Inc.
EXPR
| $90K | 0.01% |
+305
| New | +$88K |
|
|
MON
949
CALL
DELISTED
Monsanto Co
MON
| $90K | 0.01% |
+151
| New | +$17.5K |
|
|
CFNB
950
DELISTED
California First National Banc
CFNB
| $90K | 0.01% |
+16,383
| New | +$240K |
|
Similar funds
Simplex Trading's Q4 2014 Portfolio in Review
Q4 2014 is the first quarter with a 13F filing on record for Simplex Trading, which disclosed 4,682 positions worth $826M. Its ten largest holdings account for 23% of the portfolio.
Its largest position is Gilead Sciences: 319,426 shares worth $30.1M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, followed by Technology and Healthcare.
- Simplex Trading's largest Q4 2014 buy was Gilead Sciences: 319,426 shares worth $30.1M.
- Simplex Trading's ten largest holdings make up 23% of its $826M portfolio in Q4 2014.
- Simplex Trading disclosed 4,682 positions in Q4 2014, its first 13F filing on record.
Based on Simplex Trading's 13F filing for Q4 2014, filed 4 Mar 2015.