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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 97.26% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.58% |
| 4 | Communication Services | 0.34% |
| 5 | Healthcare | 0.32% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
FTCH
1551
PUT
DELISTED
Farfetch Limited Class A Ordinary Shares
FTCH
| $1.85M | ﹤0.01% |
1,786
+1,366
| +325% | +$12.3K |
|
1552
CALL
Waters Corp
WAT
$39.6B
| $1.84M | ﹤0.01% |
79
-53
| -40% | -$11.7K |
|
|
MXIM
1553
PUT
DELISTED
Maxim Integrated Products
MXIM
| $1.84M | ﹤0.01% |
300
+147
| +96% | +$8.56K |
|
1554
PUT
Amplify Junior Silver Miners ETF
SILJ
$4.2B
| $1.84M | ﹤0.01% |
1,090
+25
| +2% | +$262 |
|
1555
CALL
Aurinia Pharmaceuticals
AUPH
$2.16B
| $1.84M | ﹤0.01% |
909
-224
| -20% | -$2.06K |
|
1556
Skyworks Solutions
SWKS
$11.3B
| $1.84M | ﹤0.01% |
+15,220
| New | +$1.5M |
|
|
MMP
1557
CALL
DELISTED
Magellan Midstream Partners, L.P.
MMP
| $1.83M | ﹤0.01% |
292
+37
| +15% | +$2.31K |
|
1558
PUT
Fastly Inc
FSLY
$3.29B
| $1.83M | ﹤0.01% |
914
+539
| +144% | +$11.4K |
|
1559
CF Industries
CF
$20.6B
| $1.83M | ﹤0.01% |
38,331
+36,704
| +2,256% | +$1.72M |
|
1560
CALL
Wabtec
WAB
$47.6B
| $1.83M | ﹤0.01% |
235
-556
| -70% | -$41.1K |
|
1561
PUT
Under Armour Class C
UA
$2.15B
| $1.83M | ﹤0.01% |
907
-254
| -22% | -$4.47K |
|
1562
D.R. Horton
DHI
$39.1B
| $1.82M | ﹤0.01% |
+34,607
| New | +$1.85M |
|
1563
PUT
EPAM Systems
EPAM
$5.92B
| $1.82M | ﹤0.01% |
86
+3
| +4% | +$590 |
|
1564
ProShares UltraPro Dow 30
UDOW
$854M
| $1.82M | ﹤0.01% |
58,732
+24,540
| +72% | +$689K |
|
1565
CALL
Charles River Laboratories
CRL
$13.4B
| $1.82M | ﹤0.01% |
119
-1
| -0.8% | -$138 |
|
1566
Comcast
CMCSA
$92.8B
| $1.82M | ﹤0.01% |
+40,399
| New | +$1.8M |
|
1567
CALL
ON Semiconductor
ON
$28.6B
| $1.82M | ﹤0.01% |
745
+22
| +3% | +$465 |
|
1568
PUT
Itron
ITRI
$4.23B
| $1.81M | ﹤0.01% |
216
+209
| +2,986% | +$16.5K |
|
|
VAL
1569
CALL
DELISTED
Valaris plc Class A Ordinary Share
VAL
| $1.81M | ﹤0.01% |
2,761
+2,188
| +382% | +$10.7K |
|
1570
CALL
F5
FFIV
$22B
| $1.8M | ﹤0.01% |
129
+48
| +59% | +$6.76K |
|
1571
PUT
First Bancorp
FBP
$4.31B
| $1.8M | ﹤0.01% |
1,699
+636
| +60% | +$6.64K |
|
1572
PUT
Williams-Sonoma
WSM
$26.6B
| $1.8M | ﹤0.01% |
490
+8
| +2% | +$278 |
|
1573
CALL
AMC Entertainment Holdings
AMC
$2.23B
| $1.8M | ﹤0.01% |
248
-101
| -29% | -$8.89K |
|
1574
CALL
Boston Properties
BXP
$10.7B
| $1.79M | ﹤0.01% |
130
+81
| +165% | +$10.9K |
|
1575
PUT
Werner Enterprises
WERN
$2.38B
| $1.79M | ﹤0.01% |
492
+481
| +4,373% | +$17.6K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.