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 | |
|---|---|---|---|---|---|---|
226
Intel
INTC
$531B
| $1.69M | 0.07% |
+32,513
| New | +$1.55M |
|
227
PUT
Bank of America
BAC
$431B
| $1.69M | 0.07% |
10,758
+4,903
| +84% | +$154K |
|
228
Bausch Health
BHC
$1.71B
| $1.69M | 0.07% |
+105,920
| New | +$1.97M |
|
229
CALL
Bath & Body Works
BBWI
$4.05B
| $1.68M | 0.07% |
49,254
+47,475
| +2,669% | +$1.8M |
|
230
Twilio
TWLO
$28.1B
| $1.67M | 0.07% |
43,840
+18,460
| +73% | +$585K |
|
231
iShares Expanded Tech-Software Sector ETF
IGV
$13.2B
| $1.66M | 0.07% |
48,965
+20,900
| +74% | +$707K |
|
232
CALL
Melco Resorts & Entertainment
MLCO
$2.13B
| $1.66M | 0.07% |
56,074
+55,818
| +21,804% | +$1.56M |
|
233
iShares Russell 2000 ETF
IWM
$81.7B
| $1.63M | 0.07% |
10,730
-61,658
| -85% | -$9.52M |
|
234
CALL
Vipshop
VIPS
$7.02B
| $1.63M | 0.07% |
80,488
+79,190
| +6,101% | +$1.31M |
|
235
CALL
Costco
COST
$411B
| $1.62M | 0.07% |
1,718
-771
| -31% | -$145K |
|
236
PUT
Mastercard
MA
$472B
| $1.62M | 0.07% |
3,261
-1,366
| -30% | -$233K |
|
237
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.14B
| $1.6M | 0.07% |
15,374
+3,316
| +28% | +$301K |
|
238
CALL
Petrobras
PBR
$122B
| $1.58M | 0.07% |
4,550
+2,414
| +113% | +$31.8K |
|
239
L3Harris
LHX
$53B
| $1.58M | 0.07% |
+9,782
| New | +$1.49M |
|
|
ANDV
240
DELISTED
Andeavor
ANDV
| $1.58M | 0.07% |
15,678
-38,198
| -71% | -$3.98M |
|
241
CALL
Hain Celestial
HAIN
$53.1M
| $1.57M | 0.07% |
49,301
+47,747
| +3,073% | +$1.73M |
|
|
MNDT
242
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $1.57M | 0.07% |
92,840
-41,697
| -31% | -$672K |
|
|
BLUE
243
CALL
DELISTED
bluebird bio
BLUE
| $1.56M | 0.07% |
547
+510
| +1,378% | +$1.3M |
|
244
ProShares Ultra QQQ
QLD
$13.4B
| $1.56M | 0.07% |
+163,376
| New | +$1.67M |
|
245
Take-Two Interactive
TTWO
$43.3B
| $1.56M | 0.07% |
15,923
-25,084
| -61% | -$2.81M |
|
246
CALL
Palo Alto Networks
PANW
$272B
| $1.55M | 0.07% |
5,364
-2,058
| -28% | -$57.2K |
|
247
CALL
Northrop Grumman
NOC
$74.7B
| $1.55M | 0.07% |
496
+104
| +27% | +$34.8K |
|
248
Essex Property Trust
ESS
$18.8B
| $1.55M | 0.07% |
6,436
+5,617
| +686% | +$1.29M |
|
249
PUT
Target
TGT
$62.6B
| $1.55M | 0.07% |
3,421
+359
| +12% | +$26.1K |
|
250
PUT
AutoZone
AZO
$49.2B
| $1.54M | 0.07% |
348
-290
| -45% | -$208K |
|
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.