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 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
LKFT
1626
PUT
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.82B
| $1.51M | ﹤0.01% |
+128
| New | +$12.9K |
|
1627
PUT
AMN Healthcare
AMN
$1.28B
| $1.51M | ﹤0.01% |
320
+210
| +191% | +$11.6K |
|
1628
PUT
Crown Holdings
CCK
$12.8B
| $1.51M | ﹤0.01% |
276
+235
| +573% | +$12.1K |
|
1629
CALL
Semtech
SMTC
$11.7B
| $1.51M | ﹤0.01% |
296
+229
| +342% | +$11.8K |
|
1630
PUT
Arlo Technologies
ARLO
$1.4B
| $1.5M | ﹤0.01% |
3,645
+3,640
| +72,800% | +$20.2K |
|
|
ZEN
1631
PUT
DELISTED
ZENDESK INC
ZEN
| $1.5M | ﹤0.01% |
177
+126
| +247% | +$9.25K |
|
|
UN
1632
DELISTED
Unilever NV New York Registry Shares
UN
| $1.5M | ﹤0.01% |
+25,785
| New | +$1.42M |
|
|
CDK
1633
CALL
DELISTED
CDK Global, Inc.
CDK
| $1.5M | ﹤0.01% |
255
+23
| +10% | +$1.25K |
|
1634
PUT
Tapestry
TPR
$28.8B
| $1.5M | ﹤0.01% |
461
-433
| -48% | -$15.2K |
|
1635
PUT
LCI Industries
LCII
$2.51B
| $1.49M | ﹤0.01% |
194
+190
| +4,750% | +$15K |
|
1636
CALL
VICI Properties
VICI
$29.4B
| $1.49M | ﹤0.01% |
680
+626
| +1,159% | +$13.2K |
|
1637
PUT
Lumentum
LITE
$59.4B
| $1.49M | ﹤0.01% |
+263
| New | +$12.6K |
|
1638
PUT
SS&C Technologies
SSNC
$17.8B
| $1.48M | ﹤0.01% |
233
+180
| +340% | +$10K |
|
|
PFPT
1639
PUT
DELISTED
Proofpoint, Inc.
PFPT
| $1.48M | ﹤0.01% |
122
-57
| -32% | -$6.25K |
|
1640
PUT
Tractor Supply
TSCO
$16.3B
| $1.48M | ﹤0.01% |
755
-40
| -5% | -$727 |
|
1641
CALL
Welltower
WELL
$178B
| $1.47M | ﹤0.01% |
190
+80
| +73% | +$6K |
|
1642
CALL
Rambus
RMBS
$10.4B
| $1.47M | ﹤0.01% |
1,408
+1,402
| +23,367% | +$13.5K |
|
|
GG.WS.A
1643
CALL
DELISTED
GOLDCORP INC SERIES A WARRANTS EXP 5/30/2007
GG.WS.A
| $1.47M | ﹤0.01% |
1,286
+410
| +47% | +$469K |
|
1644
CALL
Agios Pharmaceuticals
AGIO
$2.16B
| $1.47M | ﹤0.01% |
218
-113
| -34% | -$6.58K |
|
1645
CALL
Darden Restaurants
DRI
$22.5B
| $1.47M | ﹤0.01% |
121
-218
| -64% | -$23.9K |
|
1646
PUT
Simpson Manufacturing
SSD
$7.98B
| $1.47M | ﹤0.01% |
248
+148
| +148% | +$8.75K |
|
1647
CALL
Restaurant Brands International
QSR
$25.1B
| $1.46M | ﹤0.01% |
225
-186
| -45% | -$11.4K |
|
1648
CALL
Aptiv
APTV
$12B
| $1.46M | ﹤0.01% |
184
-557
| -75% | -$42.8K |
|
|
1649
CALL
Crown Holdings
CCK
$12.8B
| $1.46M | ﹤0.01% |
268
+204
| +319% | +$10.5K |
|
1650
CALL
Rapid7
RPD
$634M
| $1.46M | ﹤0.01% |
289
-85
| -23% | -$3.64K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.