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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2851
Vanda Pharmaceuticals
VNDA
$312M
| $266K | ﹤0.01% |
10,207
-57,379
| -85% | -$1.35M |
|
2852
PUT
WEX
WEX
$6.11B
| $266K | ﹤0.01% |
19
-175
| -90% | -$28.8K |
|
|
SGEN
2853
PUT
DELISTED
Seagen Inc. Common Stock
SGEN
| $266K | ﹤0.01% |
47
-36
| -43% | -$2.26K |
|
2854
DXC Technology
DXC
$1.63B
| $265K | ﹤0.01% |
4,989
+4,167
| +507% | +$288K |
|
2855
PUT
InterDigital
IDCC
$6.68B
| $265K | ﹤0.01% |
40
-118
| -75% | -$8.6K |
|
2856
PUT
Ultragenyx Pharmaceutical
RARE
$2.65B
| $265K | ﹤0.01% |
61
+60
| +6,000% | +$3.28K |
|
2857
PUT
Visteon
VC
$2.77B
| $265K | ﹤0.01% |
+44
| New | +$3.32K |
|
2858
PUT
Gentex
GNTX
$4.88B
| $264K | ﹤0.01% |
131
+3
| +2% | +$63 |
|
2859
CALL
Waters Corp
WAT
$36.8B
| $264K | ﹤0.01% |
14
-9
| -39% | -$1.71K |
|
|
DCH
2860
Dauch Corp
DCH
$1.3B
| $263K | ﹤0.01% |
+23,740
| New | +$317K |
|
2861
1-800-Flowers.com
FLWS
$245M
| $263K | ﹤0.01% |
21,521
-4,593
| -18% | -$55K |
|
2862
CALL
Sunrun
RUN
$2.37B
| $263K | ﹤0.01% |
242
-508
| -68% | -$6.42K |
|
|
MEET
2863
CALL
DELISTED
The Meet Group, Inc. Common Stock
MEET
| $263K | ﹤0.01% |
569
+268
| +89% | +$1.14K |
|
2864
PUT
RBC Bearings
RBC
$18.8B
| $262K | ﹤0.01% |
20
-54
| -73% | -$7.86K |
|
2865
CALL
Everest Group
EG
$15.2B
| $261K | ﹤0.01% |
12
-10
| -45% | -$2.18K |
|
2866
Energizer
ENR
$1.44B
| $261K | ﹤0.01% |
+5,781
| New | +$307K |
|
2867
CGI
GIB
$13.9B
| $261K | ﹤0.01% |
+4,267
| New | +$263K |
|
2868
Steven Madden
SHOO
$3.12B
| $261K | ﹤0.01% |
+8,638
| New | +$266K |
|
2869
CALL
Trex
TREX
$4.51B
| $261K | ﹤0.01% |
88
+8
| +10% | +$250 |
|
2870
Vanguard Health Care ETF
VHT
$18.2B
| $261K | ﹤0.01% |
+1,627
| New | +$276K |
|
2871
PUT
Telephone and Data Systems
TDS
$3.91B
| $260K | ﹤0.01% |
80
+45
| +129% | +$1.49K |
|
|
ASXC
2872
PUT
DELISTED
Asensus Surgical, Inc.
ASXC
| $260K | ﹤0.01% |
89
+17
| +24% | +$773 |
|
|
SPWR
2873
CALL
DELISTED
SunPower Corporation Common Stock
SPWR
| $260K | ﹤0.01% |
800
+270
| +51% | +$1.12K |
|
|
ZNGA
2874
CALL
DELISTED
ZYNGA INC. CL A COMMON
ZNGA
| $260K | ﹤0.01% |
663
+574
| +645% | +$2.17K |
|
|
APU
2875
PUT
DELISTED
AmeriGas Partners, L.P.
APU
| $260K | ﹤0.01% |
103
+96
| +1,371% | +$3.33K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.