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
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
SLCA
1526
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $1.32M | 0.01% |
+51,595
| New | +$1.51M |
|
|
SKX
1527
PUT
DELISTED
Skechers
SKX
| $1.32M | 0.01% |
441
+242
| +122% | +$7.74K |
|
1528
PUT
Urban Outfitters
URBN
$5.99B
| $1.32M | 0.01% |
297
+246
| +482% | +$10.3K |
|
1529
PUT
WIX.com
WIX
$2.15B
| $1.32M | 0.01% |
132
-101
| -43% | -$9K |
|
|
MNDT
1530
CALL
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $1.32M | 0.01% |
858
+572
| +200% | +$9.94K |
|
1531
PUT
Range Resources
RRC
$9.11B
| $1.32M | 0.01% |
789
+446
| +130% | +$6.75K |
|
|
CTRA
1532
DELISTED
Coterra Energy
CTRA
| $1.32M | 0.01% |
+55,390
| New | +$1.29M |
|
1533
YPF
YPF
$20.2B
| $1.32M | 0.01% |
+96,981
| New | +$1.9M |
|
1534
CALL
Digital Realty Trust
DLR
$73.7B
| $1.32M | 0.01% |
118
-229
| -66% | -$24.3K |
|
1535
CALL
National Healthcare
NHC
$3.53B
| $1.32M | 0.01% |
187
-33
| -15% | -$2.16K |
|
|
AXDX
1536
CALL
DELISTED
Accelerate Diagnostics
AXDX
| $1.31M | 0.01% |
59
+9
| +18% | +$2.01K |
|
1537
PUT
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $1.31M | 0.01% |
152
+96
| +171% | +$8.42K |
|
1538
CALL
Lumentum
LITE
$59.4B
| $1.31M | 0.01% |
227
-581
| -72% | -$34.6K |
|
1539
CALL
LKQ Corp
LKQ
$6.58B
| $1.31M | 0.01% |
412
+284
| +222% | +$9.47K |
|
1540
PUT
Nabors Industries
NBR
$1.23B
| $1.31M | 0.01% |
41
+32
| +356% | +$11.7K |
|
|
SAGE
1541
CALL
DELISTED
Sage Therapeutics
SAGE
| $1.31M | 0.01% |
84
+5
| +6% | +$785 |
|
1542
CALL
Chefs' Warehouse
CHEF
$3.87B
| $1.31M | 0.01% |
+461
| New | +$12.1K |
|
1543
CALL
Perrigo
PRGO
$1.4B
| $1.31M | 0.01% |
180
-291
| -62% | -$22.4K |
|
1544
CALL
Sempra
SRE
$60.8B
| $1.31M | 0.01% |
226
-174
| -44% | -$9.52K |
|
|
P
1545
CALL
DELISTED
Pandora Media Inc
P
| $1.31M | 0.01% |
1,666
+1,159
| +229% | +$7.74K |
|
|
DO
1546
PUT
DELISTED
Diamond Offshore Drilling
DO
| $1.31M | 0.01% |
629
+325
| +107% | +$6.05K |
|
|
KYNB
1547
Kyntra Bio
KYNB
$28.5M
| $1.31M | 0.01% |
838
-227
| -21% | -$296K |
|
|
ABAX
1548
CALL
DELISTED
Abaxis Inc
ABAX
| $1.31M | 0.01% |
158
+152
| +2,533% | +$11.7K |
|
1549
PUT
IDEX
IEX
$16.5B
| $1.31M | 0.01% |
+96
| New | +$13.4K |
|
1550
CALL
Vornado Realty Trust
VNO
$7.47B
| $1.31M | 0.01% |
177
-124
| -41% | -$8.58K |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.