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 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
MRNS
1951
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $1.06M | ﹤0.01% |
63,550
+44,084
| +226% | +$635K |
|
1952
PUT
Paychex
PAYX
$40.4B
| $1.06M | ﹤0.01% |
132
-32
| -20% | -$2.36K |
|
1953
PUT
Royal Bank of Canada
RY
$291B
| $1.06M | ﹤0.01% |
140
+69
| +97% | +$5.22K |
|
1954
PUT
FMC
FMC
$1.42B
| $1.06M | ﹤0.01% |
181
| – | – |
|
|
HI
1955
CALL
DELISTED
Hillenbrand
HI
| $1.05M | ﹤0.01% |
+254
| New | +$10.7K |
|
1956
iRhythm Holdings
IRTC
$3.59B
| $1.05M | ﹤0.01% |
+14,068
| New | +$1.2M |
|
1957
CALL
Orion
OEC
$394M
| $1.05M | ﹤0.01% |
555
+548
| +7,829% | +$13.8K |
|
|
CY
1958
CALL
DELISTED
Cypress Semiconductor
CY
| $1.05M | ﹤0.01% |
706
+231
| +49% | +$3.35K |
|
|
FTCH
1959
CALL
DELISTED
Farfetch Limited Class A Ordinary Shares
FTCH
| $1.05M | ﹤0.01% |
391
+84
| +27% | +$1.88K |
|
1960
Carlyle Group
CG
$16.3B
| $1.05M | ﹤0.01% |
57,484
+8,566
| +18% | +$155K |
|
1961
PUT
Daktronics
DAKT
$941M
| $1.05M | ﹤0.01% |
1,409
+1,400
| +15,556% | +$10.9K |
|
1962
CALL
Edison International
EIX
$30.7B
| $1.05M | ﹤0.01% |
169
-155
| -48% | -$9.25K |
|
1963
CALL
Liberty Latin America Class C
LILAK
$1.5B
| $1.05M | ﹤0.01% |
632
+631
| +63,100% | +$9.83K |
|
1964
CALL
Trex
TREX
$4.51B
| $1.04M | ﹤0.01% |
340
+252
| +286% | +$8.81K |
|
1965
PUT
Exponent
EXPO
$2.98B
| $1.04M | ﹤0.01% |
+181
| New | +$9.78K |
|
1966
PUT
Valmont Industries
VMI
$9.44B
| $1.04M | ﹤0.01% |
80
-87
| -52% | -$11.2K |
|
1967
Prologis
PLD
$138B
| $1.04M | ﹤0.01% |
14,449
+10,559
| +271% | +$720K |
|
|
PRO
1968
PUT
DELISTED
PROS Holdings
PRO
| $1.04M | ﹤0.01% |
+246
| New | +$9.34K |
|
1969
PUT
Jack in the Box
JACK
$278M
| $1.04M | ﹤0.01% |
128
+92
| +256% | +$7.36K |
|
1970
PUT
Laureate Education
LAUR
$5.18B
| $1.03M | ﹤0.01% |
+692
| New | +$10.5K |
|
1971
PUT
Fortune Brands Innovations
FBIN
$6.12B
| $1.03M | ﹤0.01% |
254
+241
| +1,854% | +$9.25K |
|
1972
CALL
Domo
DOMO
$166M
| $1.03M | ﹤0.01% |
256
+243
| +1,869% | +$7.46K |
|
|
KSU
1973
CALL
DELISTED
Kansas City Southern
KSU
| $1.03M | ﹤0.01% |
89
-83
| -48% | -$8.96K |
|
1974
PUT
Upwork
UPWK
$1.09B
| $1.03M | ﹤0.01% |
539
+503
| +1,397% | +$10.3K |
|
1975
CALL
Vanguard Total Bond Market
BND
$157B
| $1.03M | ﹤0.01% |
129
+126
| +4,200% | +$10.1K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.