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
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
601
CALL
CSX Corp
CSX
$92.8B
| $4.58M | 0.02% |
2,154
-1,935
| -47% | -$39.8K |
|
602
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $4.58M | 0.02% |
129
-211
| -62% | -$74.2K |
|
603
PUT
CME Group
CME
$90.1B
| $4.56M | 0.02% |
278
+13
| +5% | +$2.12K |
|
604
PUT
Check Point Software Technologies
CHKP
$13.3B
| $4.54M | 0.02% |
465
+58
| +14% | +$5.75K |
|
605
CALL
Synaptics
SYNA
$4.71B
| $4.52M | 0.02% |
898
+744
| +483% | +$33.8K |
|
606
CALL
Fastenal
FAST
$52B
| $4.5M | 0.02% |
3,744
-136
| -4% | -$1.76K |
|
607
CALL
Expedia Group
EXPE
$31.3B
| $4.5M | 0.02% |
374
+27
| +8% | +$3.12K |
|
608
Devon Energy
DVN
$51.8B
| $4.49M | 0.02% |
102,184
+10,563
| +12% | +$409K |
|
609
CALL
NetApp
NTAP
$32.6B
| $4.49M | 0.02% |
572
+28
| +5% | +$1.97K |
|
610
CALL
Truist Financial
TFC
$63.2B
| $4.46M | 0.02% |
884
-98
| -10% | -$5.21K |
|
|
FL
611
PUT
DELISTED
Foot Locker
FL
| $4.45M | 0.02% |
846
+241
| +40% | +$11.7K |
|
|
FMI
612
PUT
DELISTED
Foundation Medicine, Inc.
FMI
| $4.44M | 0.02% |
325
+147
| +83% | +$13.4K |
|
613
Honeywell
HON
$73.8B
| $4.44M | 0.02% |
34,101
+10,436
| +44% | +$1.39M |
|
|
LHCG
614
CALL
DELISTED
LHC Group LLC
LHCG
| $4.43M | 0.02% |
518
+179
| +53% | +$13.6K |
|
615
CALL
Domino's
DPZ
$10.6B
| $4.43M | 0.02% |
157
-15,702
| -99% | -$3.98M |
|
|
STI
616
CALL
DELISTED
SunTrust Banks, Inc.
STI
| $4.43M | 0.02% |
671
+188
| +39% | +$12.8K |
|
617
CALL
Phillips 66
PSX
$84.8B
| $4.41M | 0.02% |
393
-297
| -43% | -$33.4K |
|
618
CALL
Boston Scientific
BSX
$63.9B
| $4.41M | 0.02% |
1,349
+1,208
| +857% | +$36.4K |
|
619
American Airlines Group
AAL
$9.78B
| $4.4M | 0.02% |
+115,993
| New | +$5.11M |
|
|
COHR
620
CALL
DELISTED
Coherent Inc
COHR
| $4.39M | 0.02% |
281
+159
| +130% | +$26.9K |
|
621
CALL
Royal Caribbean
RCL
$76.7B
| $4.39M | 0.02% |
424
-31
| -7% | -$3.41K |
|
622
PUT
GE Aerospace
GE
$354B
| $4.39M | 0.02% |
673
-1,601
| -70% | -$107K |
|
|
PX
623
PUT
DELISTED
Praxair Inc
PX
| $4.38M | 0.02% |
277
+170
| +159% | +$26.3K |
|
|
BLUE
624
CALL
DELISTED
bluebird bio
BLUE
| $4.36M | 0.02% |
21
-526
| -96% | -$1.2M |
|
625
CALL
Estee Lauder
EL
$29.9B
| $4.35M | 0.02% |
305
-120
| -28% | -$17.8K |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.