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 | |
|---|---|---|---|---|---|---|
|
SWN
2051
CALL
DELISTED
Southwestern Energy Company
SWN
| $940K | ﹤0.01% |
2,006
+1,729
| +624% | +$7.47K |
|
2052
MarketAxess Holdings
MKTX
$4.15B
| $939K | ﹤0.01% |
3,819
+268
| +8% | +$60.7K |
|
|
HIBB
2053
CALL
DELISTED
Hibbett, Inc. Common Stock
HIBB
| $937K | ﹤0.01% |
411
+290
| +240% | +$5.11K |
|
2054
PUT
Trex
TREX
$4.51B
| $935K | ﹤0.01% |
304
-132
| -30% | -$4.61K |
|
2055
State Street SPDR S&P Bank ETF
KBE
$1.64B
| $933K | ﹤0.01% |
22,359
-11,011
| -33% | -$472K |
|
2056
iShares MSCI China ETF
MCHI
$6.04B
| $931K | ﹤0.01% |
14,916
+9,702
| +186% | +$573K |
|
2057
CALL
Ollie's Bargain Outlet
OLLI
$4.01B
| $930K | ﹤0.01% |
109
+66
| +153% | +$5.32K |
|
|
CHK
2058
CALL
DELISTED
Chesapeake Energy Corporation
CHK
| $929K | ﹤0.01% |
15
+10
| +200% | +$5.6K |
|
|
KW
2059
PUT
DELISTED
Kennedy-Wilson Holdings
KW
| $928K | ﹤0.01% |
434
-3
| -0.7% | -$61 |
|
2060
iShares Silver Trust
SLV
$28.1B
| $928K | ﹤0.01% |
65,474
+65,374
| +65,374% | +$954K |
|
2061
PUT
Trane Technologies
TT
$106B
| $928K | ﹤0.01% |
86
-89
| -51% | -$9.02K |
|
|
ISBC
2062
CALL
DELISTED
Investors Bancorp, Inc.
ISBC
| $927K | ﹤0.01% |
783
+597
| +321% | +$7.2K |
|
2063
Valmont Industries
VMI
$9.44B
| $926K | ﹤0.01% |
7,124
-3,915
| -35% | -$505K |
|
2064
NCR Voyix
VYX
$1.06B
| $924K | ﹤0.01% |
+55,237
| New | +$915K |
|
2065
PUT
Silicon Laboratories
SLAB
$7.15B
| $921K | ﹤0.01% |
114
+86
| +307% | +$7.15K |
|
2066
CALL
InfraCap MLP ETF
AMZA
$471M
| $920K | ﹤0.01% |
154
+75
| +95% | +$4.4K |
|
|
BPMC
2067
CALL
DELISTED
Blueprint Medicines
BPMC
| $920K | ﹤0.01% |
115
+9
| +8% | +$665 |
|
2068
CALL
Bloom Energy
BE
$52.6B
| $918K | ﹤0.01% |
711
+294
| +71% | +$3.59K |
|
2069
CALL
Ecolab
ECL
$75.6B
| $918K | ﹤0.01% |
52
-89
| -63% | -$14.5K |
|
2070
CALL
Veracyte
VCYT
$4.52B
| $918K | ﹤0.01% |
+367
| New | +$7.01K |
|
|
GOOS
2071
Canada Goose Holdings
GOOS
$868M
| $917K | ﹤0.01% |
+19,111
| New | +$975K |
|
|
FOLD
2072
CALL
DELISTED
Amicus Therapeutics
FOLD
| $915K | ﹤0.01% |
673
+510
| +313% | +$6.23K |
|
2073
CALL
LendingTree
TREE
$544M
| $914K | ﹤0.01% |
26
| – | – |
|
2074
PUT
Banco Bradesco
BBD
$38.1B
| $913K | ﹤0.01% |
1,337
-1,135
| -46% | -$8.16K |
|
2075
Macy's
M
$6.15B
| $913K | ﹤0.01% |
38,020
-71,945
| -65% | -$1.82M |
|
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.