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 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1576
CALL
PepsiCo
PEP
$186B
| $132K | 0.01% |
1,136
-371
| -25% | -$42.2K |
|
1577
CALL
Prothena Corp
PRTA
$458M
| $132K | 0.01% |
244
+86
| +54% | +$3.13K |
|
1578
Smart Sand
SND
$200M
| $132K | 0.01% |
+22,786
| New | +$188K |
|
|
CXO
1579
PUT
DELISTED
CONCHO RESOURCES INC.
CXO
| $132K | 0.01% |
279
-205
| -42% | -$31.3K |
|
|
CBM
1580
DELISTED
Cambrex Corporation
CBM
| $132K | 0.01% |
2,537
-535
| -17% | -$28.6K |
|
|
GHDX
1581
DELISTED
Genomic Health, Inc.
GHDX
| $132K | 0.01% |
4,239
+980
| +30% | +$32.5K |
|
1582
DNOW Inc
DNOW
$2.63B
| $131K | 0.01% |
+12,820
| New | +$140K |
|
|
MASI
1583
DELISTED
Masimo
MASI
| $131K | 0.01% |
1,498
-778
| -34% | -$67.8K |
|
1584
PUT
Vulcan Materials
VMC
$36.3B
| $131K | 0.01% |
401
+207
| +107% | +$26.1K |
|
|
CORR
1585
DELISTED
CorEnergy Infrastructure Trust, Inc.
CORR
| $131K | 0.01% |
+3,490
| New | +$130K |
|
|
XLNX
1586
DELISTED
Xilinx Inc
XLNX
| $131K | 0.01% |
+1,817
| New | +$131K |
|
1587
Global Payments
GPN
$22.1B
| $130K | 0.01% |
1,173
+314
| +37% | +$34.7K |
|
1588
PUT
Melco Resorts & Entertainment
MLCO
$2.1B
| $130K | 0.01% |
1,040
-399
| -28% | -$11.2K |
|
|
ABB
1589
PUT
DELISTED
ABB Ltd
ABB
| $130K | 0.01% |
269
+209
| +348% | +$5.38K |
|
|
EMWP
1590
PUT
DELISTED
Eros Media World PLC
EMWP
| $130K | 0.01% |
33
+13
| +65% | +$3.1K |
|
|
WMGI
1591
DELISTED
Wright Medical Group Inc
WMGI
| $130K | 0.01% |
+6,592
| New | +$141K |
|
1592
PUT
Alcoa
AA
$11.7B
| $129K | 0.01% |
978
-13
| -1% | -$644 |
|
1593
CALL
Fortinet
FTNT
$112B
| $129K | 0.01% |
1,210
-545
| -31% | -$5.31K |
|
1594
CALL
Zillow
Z
$7.04B
| $129K | 0.01% |
163
| – | – |
|
1595
CALL
Home BancShares
HOMB
$6.21B
| $128K | 0.01% |
5,250
+5,228
| +23,764% | +$125K |
|
1596
PUT
KRONOS Worldwide
KRO
$761M
| $128K | 0.01% |
504
-281
| -36% | -$6.99K |
|
1597
CALL
McCormick & Company Non-Voting
MKC
$13.4B
| $128K | 0.01% |
196
+100
| +104% | +$5.26K |
|
1598
Worthington Enterprises
WOR
$2.76B
| $128K | 0.01% |
+4,864
| New | +$137K |
|
|
WP
1599
CALL
DELISTED
Worldpay, Inc.
WP
| $128K | 0.01% |
371
+312
| +529% | +$24.7K |
|
|
FNSR
1600
CALL
DELISTED
Finisar Corp
FNSR
| $128K | 0.01% |
7,899
+6,856
| +657% | +$129K |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.