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 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
DERM
2926
DELISTED
Dermira, Inc.
DERM
| $246K | ﹤0.01% |
+34,318
| New | +$375K |
|
2927
CALL
Franklin Covey
FC
$247M
| $245K | ﹤0.01% |
110
-15
| -12% | -$335 |
|
2928
iShares Core S&P Total US Stock Market ETF
ITOT
$93.2B
| $245K | ﹤0.01% |
+4,318
| New | +$265K |
|
2929
CALL
Manhattan Associates
MANH
$9.63B
| $245K | ﹤0.01% |
58
+10
| +21% | +$474 |
|
2930
Safety Insurance
SAFT
$1.51B
| $245K | ﹤0.01% |
+3,004
| New | +$256K |
|
2931
CALL
Spectrum Brands
SPB
$2.04B
| $245K | ﹤0.01% |
58
+13
| +29% | +$751 |
|
|
TPIC
2932
PUT
DELISTED
TPI Composites
TPIC
| $245K | ﹤0.01% |
+100
| New | +$2.54K |
|
|
BPT
2933
CALL
DELISTED
BP Prudhoe Bay Royalty Trust
BPT
| $244K | ﹤0.01% |
113
+61
| +117% | +$1.75K |
|
2934
iShares US Transportation ETF
IYT
$2.31B
| $244K | ﹤0.01% |
5,932
+128
| +2% | +$5.91K |
|
2935
CALL
Old Republic International
ORI
$10.5B
| $244K | ﹤0.01% |
119
+89
| +297% | +$1.91K |
|
2936
Stratasys
SSYS
$695M
| $244K | ﹤0.01% |
13,577
+8,424
| +163% | +$176K |
|
2937
Brookfield
BN
$103B
| $243K | ﹤0.01% |
+17,769
| New | +$265K |
|
2938
CALL
Dycom Industries
DY
$12.4B
| $243K | ﹤0.01% |
45
+41
| +1,025% | +$2.75K |
|
2939
PUT
Warrior Met Coal
HCC
$4.25B
| $243K | ﹤0.01% |
101
-93
| -48% | -$2.38K |
|
2940
CALL
United Natural Foods
UNFI
$2.98B
| $243K | ﹤0.01% |
230
+103
| +81% | +$2.17K |
|
2941
PUT
Unum
UNM
$13.7B
| $243K | ﹤0.01% |
83
-59
| -42% | -$2.06K |
|
|
ACIA
2942
CALL
DELISTED
Acacia Communications Inc
ACIA
| $243K | ﹤0.01% |
64
-81
| -56% | -$3.27K |
|
|
MXWL
2943
PUT
DELISTED
Maxwell Technologies Inc
MXWL
| $243K | ﹤0.01% |
1,177
+1,005
| +584% | +$2.72K |
|
2944
iShares MSCI EAFE ETF
EFA
$76.5B
| $242K | ﹤0.01% |
+4,128
| New | +$258K |
|
2945
NovoCure
NVCR
$2.01B
| $242K | ﹤0.01% |
7,243
-599
| -8% | -$21.9K |
|
|
CSOD
2946
CALL
DELISTED
Cornerstone OnDemand, Inc.
CSOD
| $242K | ﹤0.01% |
48
-64
| -57% | -$3.25K |
|
2947
PUT
Precigen
PGEN
$1.99B
| $241K | ﹤0.01% |
370
-138
| -27% | -$1.55K |
|
2948
PUT
CBRE Group
CBRE
$41.8B
| $240K | ﹤0.01% |
60
-97
| -62% | -$4.01K |
|
2949
CALL
nLIGHT
LASR
$3.75B
| $240K | ﹤0.01% |
135
+131
| +3,275% | +$2.48K |
|
2950
PUT
Xylem
XYL
$28.6B
| $240K | ﹤0.01% |
36
-81
| -69% | -$5.6K |
|
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 1,573 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 Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- 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 1,573 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.