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 | |
|---|---|---|---|---|---|---|
326
CALL
Lam Research
LRCX
$397B
| $1.2M | 0.05% |
11,340
+5,440
| +92% | +$108K |
|
327
CALL
NRG Energy
NRG
$29.8B
| $1.19M | 0.05% |
2,205
+699
| +46% | +$19.4K |
|
328
CALL
YPF
YPF
$20.6B
| $1.19M | 0.05% |
54,222
+52,667
| +3,387% | +$1.22M |
|
329
Monster Beverage
MNST
$91.4B
| $1.18M | 0.05% |
41,328
+15,906
| +63% | +$497K |
|
330
Mohawk Industries
MHK
$6.68B
| $1.18M | 0.05% |
+5,088
| New | +$1.31M |
|
331
PUT
AT&T
T
$159B
| $1.18M | 0.05% |
8,629
-287
| -3% | -$7.99K |
|
|
EMBJ
332
Embraer S.A. ADS
EMBJ
$11.7B
| $1.18M | 0.05% |
45,223
+34,134
| +308% | +$887K |
|
333
PUT
ProShares UltraShort Health Care
RXD
$3.29M
| $1.17M | 0.05% |
523
+251
| +92% | +$28.2K |
|
334
CALL
Broadcom
AVGO
$1.85T
| $1.17M | 0.05% |
22,840
+8,700
| +62% | +$219K |
|
335
CACI
CACI
$10.5B
| $1.17M | 0.05% |
7,706
+7,219
| +1,482% | +$1.06M |
|
336
PUT
iShares Morningstar Value ETF
ILCV
$1.29B
| $1.17M | 0.05% |
13,632
-486
| -3% | -$25.8K |
|
337
CALL
Acuity Brands
AYI
$9.79B
| $1.16M | 0.05% |
8,409
+8,380
| +28,897% | +$1.29M |
|
|
338
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$45.5B
| $1.16M | 0.05% |
5,989
-1,560
| -21% | -$392K |
|
339
NetEase
NTES
$76.7B
| $1.14M | 0.05% |
20,415
+13,385
| +190% | +$841K |
|
340
PUT
Roku
ROKU
$21B
| $1.14M | 0.05% |
2,404
-3,934
| -62% | -$162K |
|
341
Amplify Cybersecurity ETF
HACK
$2.6B
| $1.14M | 0.05% |
33,324
+29,431
| +756% | +$994K |
|
342
Leidos
LDOS
$13.7B
| $1.14M | 0.05% |
17,466
+10,662
| +157% | +$704K |
|
343
ProShares Ultra S&P500
SSO
$7.79B
| $1.14M | 0.05% |
86,624
-145,520
| -63% | -$2.07M |
|
344
Oracle
ORCL
$345B
| $1.14M | 0.05% |
24,883
-25,334
| -50% | -$1.26M |
|
345
PUT
PayPal
PYPL
$49.2B
| $1.14M | 0.05% |
3,719
+271
| +8% | +$21.5K |
|
346
CALL
Waste Management
WM
$95.1B
| $1.14M | 0.05% |
973
+60
| +7% | +$5.15K |
|
|
X
347
PUT
DELISTED
US Steel
X
| $1.13M | 0.05% |
5,065
-2,844
| -36% | -$112K |
|
348
CALL
Barclays
BCS
$93.3B
| $1.13M | 0.05% |
99,567
+99,423
| +69,044% | +$1.08M |
|
349
CALL
Autodesk
ADSK
$43.3B
| $1.12M | 0.05% |
1,087
+261
| +32% | +$31.1K |
|
350
Cognizant
CTSH
$20.2B
| $1.12M | 0.05% |
13,897
+9,038
| +186% | +$714K |
|
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.