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 | |
|---|---|---|---|---|---|---|
|
BRSL
3626
PUT
Brightstar Lottery PLC
BRSL
$1.9B
| $15K | ﹤0.01% |
103
-13
| -11% | -$361 |
|
3627
Imperial Oil
IMO
$62.3B
| $15K | ﹤0.01% |
578
-3,190
| -85% | -$92K |
|
3628
PUT
Kimco Realty
KIM
$17.5B
| $15K | ﹤0.01% |
112
+16
| +17% | +$246 |
|
3629
Kopin
KOPN
$586M
| $15K | ﹤0.01% |
5,126
+3,711
| +262% | +$12.5K |
|
3630
CALL
LKQ Corp
LKQ
$6.72B
| $15K | ﹤0.01% |
128
+42
| +49% | +$1.71K |
|
3631
PUT
Methode Electronics
MEI
$458M
| $15K | ﹤0.01% |
137
+68
| +99% | +$2.76K |
|
3632
PUT
M/I Homes
MHO
$3.95B
| $15K | ﹤0.01% |
+46
| New | +$1.51K |
|
3633
CALL
MSCI
MSCI
$42.4B
| $15K | ﹤0.01% |
31
+16
| +107% | +$2.29K |
|
3634
PUT
Neurocrine Biosciences
NBIX
$18.2B
| $15K | ﹤0.01% |
60
-202
| -77% | -$17.1K |
|
3635
CALL
Pan American Silver
PAAS
$17.9B
| $15K | ﹤0.01% |
176
-70
| -28% | -$1.11K |
|
3636
Peoples Bancorp
PEBO
$1.51B
| $15K | ﹤0.01% |
434
+134
| +45% | +$4.68K |
|
3637
PUT
Plug Power
PLUG
$2.65B
| $15K | ﹤0.01% |
205
+77
| +60% | +$155 |
|
3638
CALL
Post Holdings
POST
$4.42B
| $15K | ﹤0.01% |
58
-396
| -87% | -$20K |
|
3639
PUT
PRA Group
PRAA
$672M
| $15K | ﹤0.01% |
125
+61
| +95% | +$2.22K |
|
3640
CALL
Ultragenyx Pharmaceutical
RARE
$2.46B
| $15K | ﹤0.01% |
12
-4
| -25% | -$201 |
|
3641
RB Global
RBA
$21.5B
| $15K | ﹤0.01% |
+484
| New | +$15.4K |
|
3642
PUT
Royal Bank of Canada
RY
$287B
| $15K | ﹤0.01% |
36
+5
| +16% | +$406 |
|
3643
CALL
Stoneridge
SRI
$200M
| $15K | ﹤0.01% |
186
+136
| +272% | +$3.32K |
|
3644
TIM SA
TIMB
$9.1B
| $15K | ﹤0.01% |
728
+142
| +24% | +$3K |
|
3645
CALL
Teekay
TK
$996M
| $15K | ﹤0.01% |
398
+363
| +1,037% | +$3.14K |
|
3646
PUT
Talphera
TLPH
$68M
| $15K | ﹤0.01% |
+3
| New | +$118 |
|
3647
CALL
Trinity Industries
TRN
$2.92B
| $15K | ﹤0.01% |
278
-248
| -47% | -$6.11K |
|
3648
PUT
TC Energy
TRP
$70.1B
| $15K | ﹤0.01% |
50
+6
| +14% | +$269 |
|
3649
PUT
Travelers Companies
TRV
$81.1B
| $15K | ﹤0.01% |
234
-123
| -34% | -$17.2K |
|
3650
USA Compression Partners
USAC
$3.69B
| $15K | ﹤0.01% |
+898
| New | +$16K |
|
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.