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 | |
|---|---|---|---|---|---|---|
1851
CALL
Interactive Brokers
IBKR
$40.9B
| $776K | ﹤0.01% |
568
-904
| -61% | -$12.1K |
|
|
COUP
1852
PUT
DELISTED
Coupa Software Incorporated
COUP
| $773K | ﹤0.01% |
123
+31
| +34% | +$1.96K |
|
1853
CALL
Hormel Foods
HRL
$13.9B
| $772K | ﹤0.01% |
181
-9
| -5% | -$388 |
|
|
AZPN
1854
CALL
DELISTED
ASPEN TECHNOLOGY INC
AZPN
| $772K | ﹤0.01% |
94
+34
| +57% | +$279K |
|
1855
CALL
News Corp Class B
NWS
$16.4B
| $771K | ﹤0.01% |
680
+119
| +21% | +$1.56K |
|
1856
CALL
Primerica
PRI
$9.81B
| $771K | ﹤0.01% |
79
+69
| +690% | +$7.67K |
|
1857
CALL
Aon
AON
$77.3B
| $770K | ﹤0.01% |
53
+15
| +39% | +$2.33K |
|
1858
Carlyle Group
CG
$16.3B
| $770K | ﹤0.01% |
48,918
+27,465
| +128% | +$521K |
|
1859
PUT
Fastenal
FAST
$54B
| $768K | ﹤0.01% |
588
+4
| +0.7% | +$54 |
|
|
HOLX
1860
PUT
DELISTED
Hologic
HOLX
| $768K | ﹤0.01% |
187
+172
| +1,147% | +$7.05K |
|
1861
CALL
Tyson Foods
TSN
$20.2B
| $768K | ﹤0.01% |
144
+66
| +85% | +$3.88K |
|
1862
PUT
Virtu Financial
VIRT
$5.2B
| $767K | ﹤0.01% |
298
+275
| +1,196% | +$6.63K |
|
|
DVAX
1863
DELISTED
Dynavax Technologies
DVAX
| $766K | ﹤0.01% |
83,805
-15,835
| -16% | -$175K |
|
1864
CALL
MSCI
MSCI
$40B
| $766K | ﹤0.01% |
52
-108
| -68% | -$16.4K |
|
1865
CALL
Tetra Tech
TTEK
$8.23B
| $766K | ﹤0.01% |
740
+175
| +31% | +$2.17K |
|
1866
Microchip Technology
MCHP
$42.8B
| $765K | ﹤0.01% |
+21,278
| New | +$751K |
|
1867
Textron
TXT
$16.6B
| $765K | ﹤0.01% |
16,645
+12,073
| +264% | +$679K |
|
|
NAV
1868
CALL
DELISTED
Navistar International
NAV
| $765K | ﹤0.01% |
295
-142
| -32% | -$4.44K |
|
1869
CALL
Welltower
WELL
$178B
| $763K | ﹤0.01% |
110
+43
| +64% | +$2.93K |
|
1870
CALL
Voya Financial
VOYA
$8.94B
| $762K | ﹤0.01% |
190
+163
| +604% | +$7.24K |
|
1871
CALL
Factset
FDS
$9.05B
| $760K | ﹤0.01% |
38
+5
| +15% | +$1.1K |
|
1872
PUT
Genworth Financial
GNW
$3.8B
| $760K | ﹤0.01% |
1,632
+866
| +113% | +$3.74K |
|
1873
CALL
Invesco CurrencyShares Canadian Dollar Trust
FXC
$69.2M
| $759K | ﹤0.01% |
105
-30
| -22% | -$2.24K |
|
1874
Hasbro
HAS
$12.6B
| $757K | ﹤0.01% |
+9,317
| New | +$867K |
|
1875
PUT
Ubiquiti
UI
$31.8B
| $755K | ﹤0.01% |
76
-210
| -73% | -$20.8K |
|
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.