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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2726
CALL
Unisys
UIS
$227M
| $515K | ﹤0.01% |
435
+259
| +147% | +$2.6K |
|
2727
PUT
Astec Industries
ASTE
$1.3B
| $512K | ﹤0.01% |
122
-18
| -13% | -$653 |
|
2728
PUT
Enovis
ENOV
$1.56B
| $512K | ﹤0.01% |
82
+26
| +46% | +$1.47K |
|
2729
PUT
Wave Life Sciences
WVE
$1.12B
| $512K | ﹤0.01% |
640
+639
| +63,900% | +$15.7K |
|
|
EXK
2730
CALL
Endeavour Silver
EXK
$2.32B
| $511K | ﹤0.01% |
2,122
+1,580
| +292% | +$3.59K |
|
2731
PUT
MPLX
MPLX
$59.5B
| $511K | ﹤0.01% |
201
-227
| -53% | -$5.79K |
|
2732
FuelCell Energy
FCEL
$1.7B
| $510K | ﹤0.01% |
+6,775
| New | +$118K |
|
|
PR
2733
PUT
Permian Resources
PR
$17.9B
| $510K | ﹤0.01% |
1,104
+727
| +193% | +$2.66K |
|
2734
CALL
Newmark Group
NMRK
$2.73B
| $509K | ﹤0.01% |
379
+302
| +392% | +$3.52K |
|
2735
PUT
PagerDuty
PD
$700M
| $509K | ﹤0.01% |
218
+23
| +12% | +$566 |
|
|
MODN
2736
CALL
DELISTED
MODEL N, INC.
MODN
| $508K | ﹤0.01% |
145
+48
| +49% | +$1.46K |
|
|
AJRD
2737
DELISTED
Aerojet Rocketdyne Holdings
AJRD
| $508K | ﹤0.01% |
11,127
+10,734
| +2,731% | +$486K |
|
2738
PUT
Insperity
NSP
$1.85B
| $507K | ﹤0.01% |
59
+41
| +228% | +$3.57K |
|
2739
PUT
Alliance Resource Partners
ARLP
$3.18B
| $506K | ﹤0.01% |
468
+385
| +464% | +$4.62K |
|
2740
CALL
Hecla Mining
HL
$10.2B
| $506K | ﹤0.01% |
1,494
-302
| -17% | -$741 |
|
2741
CALL
iShares Gold Trust
IAU
$63B
| $506K | ﹤0.01% |
175
+40
| +30% | +$1.14K |
|
2742
CALL
Insmed
INSM
$23.2B
| $506K | ﹤0.01% |
212
+206
| +3,433% | +$4.19K |
|
2743
CALL
WPP
WPP
$4.04B
| $506K | ﹤0.01% |
72
-28
| -28% | -$1.77K |
|
2744
PUT
GDS Holdings
GDS
$6.34B
| $505K | ﹤0.01% |
98
-46
| -32% | -$2.06K |
|
2745
PUT
TG Therapeutics
TGTX
$8.58B
| $505K | ﹤0.01% |
455
+180
| +65% | +$1.37K |
|
2746
PUT
Liberty Media Series A
FWONA
$22.3B
| $504K | ﹤0.01% |
111
-73
| -40% | -$2.87K |
|
2747
PUT
Yeti Holdings
YETI
$3.82B
| $504K | ﹤0.01% |
145
-14
| -9% | -$441 |
|
|
CIT
2748
DELISTED
CIT Group Inc.
CIT
| $504K | ﹤0.01% |
+11,061
| New | +$495K |
|
2749
MBIA
MBI
$288M
| $503K | ﹤0.01% |
54,134
+41,228
| +319% | +$392K |
|
2750
CALL
Olin
OLN
$2.64B
| $503K | ﹤0.01% |
292
+18
| +7% | +$322 |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.