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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 97.5% |
| 2 | Communication Services | 0.5% |
| 3 | Consumer Discretionary | 0.49% |
| 4 | Technology | 0.41% |
| 5 | Financials | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1576
CALL
Cedar Fair
FUN
$1.63B
| $1.07M | ﹤0.01% |
227
+62
| +38% | +$3.23K |
|
1577
Kohl's
KSS
$2.12B
| $1.07M | ﹤0.01% |
16,182
-862
| -5% | -$60.5K |
|
1578
CALL
Protolabs
PRLB
$1.96B
| $1.07M | ﹤0.01% |
95
+3
| +3% | +$370 |
|
1579
PUT
Raymond James Financial
RJF
$34.3B
| $1.07M | ﹤0.01% |
216
-23
| -10% | -$1.23K |
|
1580
ASML
ASML
$679B
| $1.07M | ﹤0.01% |
+6,866
| New | +$1.16M |
|
1581
PUT
ON Semiconductor
ON
$28.3B
| $1.07M | ﹤0.01% |
647
+437
| +208% | +$7.56K |
|
1582
PUT
Paychex
PAYX
$41.6B
| $1.07M | ﹤0.01% |
164
+2
| +1% | +$135 |
|
1583
PUT
AstraZeneca
AZN
$249B
| $1.07M | ﹤0.01% |
141
-73
| -34% | -$5.7K |
|
1584
CALL
3D Systems Corp
DDD
$575M
| $1.07M | ﹤0.01% |
1,049
+674
| +180% | +$9.24K |
|
1585
Tyson Foods
TSN
$18.3B
| $1.07M | ﹤0.01% |
19,978
+3,640
| +22% | +$214K |
|
1586
Caesarstone
CSTE
$104M
| $1.06M | ﹤0.01% |
78,471
+46,290
| +144% | +$721K |
|
1587
CALL
Live Nation Entertainment
LYV
$39.8B
| $1.06M | ﹤0.01% |
216
-226
| -51% | -$11.9K |
|
|
SAGE
1588
PUT
DELISTED
Sage Therapeutics
SAGE
| $1.06M | ﹤0.01% |
111
+5
| +5% | +$572 |
|
|
SINA
1589
CALL
DELISTED
Sina Corp
SINA
| $1.06M | ﹤0.01% |
200
-7
| -3% | -$432 |
|
|
ARCH
1590
CALL
DELISTED
Arch Resources, Inc.
ARCH
| $1.05M | ﹤0.01% |
127
+69
| +119% | +$6.14K |
|
1591
CALL
Nasdaq
NDAQ
$53.4B
| $1.05M | ﹤0.01% |
387
+27
| +8% | +$769 |
|
1592
CALL
Western Union
WU
$2.2B
| $1.05M | ﹤0.01% |
615
+566
| +1,155% | +$10.3K |
|
1593
CALL
Itaú Unibanco
ITUB
$91.5B
| $1.05M | ﹤0.01% |
1,132
-2,432
| -68% | -$15.6K |
|
1594
PUT
RingCentral
RNG
$5.89B
| $1.05M | ﹤0.01% |
127
-524
| -80% | -$41.3K |
|
1595
AB InBev
BUD
$157B
| $1.04M | ﹤0.01% |
15,882
+7,101
| +81% | +$543K |
|
|
WRK
1596
PUT
DELISTED
WestRock Company
WRK
| $1.04M | ﹤0.01% |
277
-29
| -9% | -$1.28K |
|
|
AVB
1597
CALL
DELISTED
AvalonBay Communities
AVB
| $1.04M | ﹤0.01% |
60
+8
| +15% | +$1.45K |
|
1598
CALL
Parker-Hannifin
PH
$121B
| $1.04M | ﹤0.01% |
70
-204
| -74% | -$33K |
|
1599
CALL
Supernus Pharmaceuticals
SUPN
$2.47B
| $1.04M | ﹤0.01% |
314
-2
| -0.6% | -$86 |
|
1600
United States Brent Oil Fund
BNO
$702M
| $1.04M | ﹤0.01% |
67,705
+17,942
| +36% | +$349K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,572 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, up from 95% a quarter earlier, followed by Communication Services and Consumer Discretionary.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,572 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.