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 | |
|---|---|---|---|---|---|---|
|
ESRX
826
DELISTED
Express Scripts Holding Company
ESRX
| $3.1M | 0.01% |
40,142
-57,154
| -59% | -$4.29M |
|
827
ProShares Ultra S&P500
SSO
$7.82B
| $3.1M | 0.01% |
222,576
+135,952
| +157% | +$1.87M |
|
828
CALL
Fluor
FLR
$7.44B
| $3.09M | 0.01% |
633
-140
| -18% | -$7.33K |
|
|
ANDX
829
CALL
DELISTED
Andeavor Logistics LP
ANDX
| $3.09M | 0.01% |
726
+529
| +269% | +$23.6K |
|
|
NBIS
830
Nebius Group N.V.
NBIS
$56.1B
| $3.08M | 0.01% |
85,843
+52,402
| +157% | +$1.83M |
|
831
PUT
Interactive Brokers
IBKR
$40.9B
| $3.07M | 0.01% |
1,908
-268
| -12% | -$4.85K |
|
832
CALL
AerCap
AER
$23.4B
| $3.06M | 0.01% |
566
+335
| +145% | +$18K |
|
833
PUT
AptarGroup
ATR
$8.23B
| $3.06M | 0.01% |
328
-187
| -36% | -$17.4K |
|
834
CALL
HCA Healthcare
HCA
$83.5B
| $3.06M | 0.01% |
298
-20
| -6% | -$2.02K |
|
835
Petrobras
PBR
$122B
| $3.06M | 0.01% |
+304,797
| New | +$3.9M |
|
|
SRG
836
PUT
Seritage Growth Properties
SRG
$130M
| $3.05M | 0.01% |
719
+601
| +509% | +$23.5K |
|
837
PUT
Akamai
AKAM
$17.1B
| $3.05M | 0.01% |
416
+319
| +329% | +$23.9K |
|
838
ProShares UltraPro QQQ
TQQQ
$32.2B
| $3.04M | 0.01% |
426,368
-547,120
| -56% | -$3.69M |
|
839
PUT
Sempra
SRE
$61.1B
| $3.04M | 0.01% |
524
+98
| +23% | +$5.36K |
|
|
EXAS
840
PUT
DELISTED
Exact Sciences
EXAS
| $3.04M | 0.01% |
508
-268
| -35% | -$14.4K |
|
841
PUT
Affiliated Managers Group
AMG
$9.19B
| $3.03M | 0.01% |
204
+101
| +98% | +$16.6K |
|
842
PUT
Aptiv
APTV
$11.9B
| $3.03M | 0.01% |
333
+176
| +112% | +$16.4K |
|
843
PUT
VF Corp
VFC
$6.49B
| $3.03M | 0.01% |
395
+115
| +41% | +$8.66K |
|
844
CALL
Vodafone
VOD
$35.1B
| $3.03M | 0.01% |
1,247
+44
| +4% | +$1.2K |
|
845
PUT
Heron Therapeutics
HRTX
$86.9M
| $3.03M | 0.01% |
780
+643
| +469% | +$20.5K |
|
846
CALL
Edwards Lifesciences
EW
$48.3B
| $3.03M | 0.01% |
624
+435
| +230% | +$20.3K |
|
|
847
PUT
Advanced Micro Devices
AMD
$880B
| $3.02M | 0.01% |
2,018
-9,750
| -83% | -$124K |
|
848
PUT
Camping World
CWH
$358M
| $3.02M | 0.01% |
1,210
+1,071
| +771% | +$26.7K |
|
849
CALL
Mohawk Industries
MHK
$6.71B
| $3.02M | 0.01% |
141
+66
| +88% | +$14.4K |
|
850
Spotify
SPOT
$96.4B
| $3.02M | 0.01% |
+17,958
| New | +$2.87M |
|
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.