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 | |
|---|---|---|---|---|---|---|
251
CALL
Citigroup
C
$223B
| $1.53M | 0.07% |
11,243
+5,018
| +81% | +$377K |
|
252
Eastman Chemical
EMN
$7.96B
| $1.52M | 0.07% |
+14,450
| New | +$1.46M |
|
|
SINA
253
DELISTED
Sina Corp
SINA
| $1.52M | 0.07% |
14,587
+5,442
| +60% | +$624K |
|
|
AGN
254
CALL
DELISTED
Allergan plc
AGN
| $1.52M | 0.07% |
3,152
+80
| +3% | +$13.4K |
|
255
CALL
Nike
NKE
$62B
| $1.52M | 0.07% |
3,123
-1,470
| -32% | -$97K |
|
256
T-Mobile US
TMUS
$207B
| $1.51M | 0.07% |
24,686
+6,004
| +32% | +$376K |
|
257
Restaurant Brands International
QSR
$25.7B
| $1.5M | 0.07% |
26,361
+26,260
| +26,000% | +$1.56M |
|
258
United Airlines
UAL
$38B
| $1.5M | 0.07% |
21,528
-137,165
| -86% | -$9.48M |
|
|
ULTI
259
CALL
DELISTED
Ultimate Software Group Inc
ULTI
| $1.49M | 0.07% |
6,131
+6,039
| +6,564% | +$1.43M |
|
260
KraneShares CSI China Internet ETF
KWEB
$5.24B
| $1.49M | 0.07% |
24,206
-5,320
| -18% | -$341K |
|
261
Direxion Daily Financial Bull 3x ETF
FAS
$2.36B
| $1.47M | 0.06% |
+22,920
| New | +$1.64M |
|
262
ServiceNow
NOW
$100B
| $1.46M | 0.06% |
+44,230
| New | +$1.37M |
|
|
ILG
263
DELISTED
ILG, Inc Common Stock
ILG
| $1.42M | 0.06% |
45,562
+21,945
| +93% | +$687K |
|
264
PUT
ExxonMobil
XOM
$641B
| $1.41M | 0.06% |
4,003
-2,805
| -41% | -$224K |
|
265
CALL
HDFC Bank
HDB
$119B
| $1.41M | 0.06% |
55,972
+55,300
| +8,229% | +$1.39M |
|
266
Marvell Technology
MRVL
$190B
| $1.41M | 0.06% |
66,920
+35,990
| +116% | +$824K |
|
267
PUT
Visa
V
$675B
| $1.41M | 0.06% |
3,478
-2,590
| -43% | -$314K |
|
268
PUT
Oracle
ORCL
$363B
| $1.4M | 0.06% |
6,685
+3,087
| +86% | +$153K |
|
269
PUT
Broadcom
AVGO
$1.86T
| $1.4M | 0.06% |
10,140
-14,660
| -59% | -$369K |
|
270
PUT
Salesforce
CRM
$135B
| $1.39M | 0.06% |
7,607
+3,806
| +100% | +$437K |
|
271
CALL
Adobe
ADBE
$88.5B
| $1.39M | 0.06% |
1,210
-552
| -31% | -$112K |
|
272
Cardinal Health
CAH
$53.4B
| $1.38M | 0.06% |
+22,086
| New | +$1.52M |
|
273
TransDigm Group
TDG
$66.8B
| $1.38M | 0.06% |
+4,503
| New | +$1.33M |
|
274
RTX Corp
RTX
$262B
| $1.38M | 0.06% |
+17,447
| New | +$1.44M |
|
275
CALL
Alaska Air
ALK
$4.82B
| $1.38M | 0.06% |
21,541
+20,912
| +3,325% | +$1.39M |
|
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.