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 | |
|---|---|---|---|---|---|---|
2101
Century Communities
CCS
$2B
| $570K | ﹤0.01% |
33,045
+32,482
| +5,769% | +$677K |
|
2102
CALL
LendingTree
TREE
$544M
| $570K | ﹤0.01% |
26
-131
| -83% | -$29.7K |
|
2103
CALL
Shutterstock
SSTK
$205M
| $568K | ﹤0.01% |
158
+51
| +48% | +$2.08K |
|
2104
CALL
TC Energy
TRP
$73.5B
| $567K | ﹤0.01% |
159
-223
| -58% | -$8.8K |
|
|
NVO
2105
PUT
Novo Nordisk
NVO
$216B
| $566K | ﹤0.01% |
246
-274
| -53% | -$6.09K |
|
2106
CALL
Thor Industries
THO
$3.99B
| $566K | ﹤0.01% |
109
-59
| -35% | -$3.99K |
|
|
JKS
2107
CALL
JinkoSolar
JKS
$775M
| $565K | ﹤0.01% |
572
+398
| +229% | +$3.93K |
|
2108
NMI Holdings
NMIH
$3.25B
| $564K | ﹤0.01% |
31,630
+30,120
| +1,995% | +$586K |
|
2109
CALL
Canadian National Railway
CNI
$78.3B
| $563K | ﹤0.01% |
76
+61
| +407% | +$5.06K |
|
2110
CALL
Zions Bancorporation
ZION
$10.1B
| $562K | ﹤0.01% |
138
-236
| -63% | -$11K |
|
|
ZUO
2111
PUT
DELISTED
Zuora, Inc.
ZUO
| $562K | ﹤0.01% |
310
-67
| -18% | -$1.29K |
|
|
BEL
2112
CALL
DELISTED
Belmond Ltd.
BEL
| $560K | ﹤0.01% |
224
+218
| +3,633% | +$4.2K |
|
|
BPL
2113
DELISTED
Buckeye Partners, L.P.
BPL
| $559K | ﹤0.01% |
19,302
+18,033
| +1,421% | +$574K |
|
|
NXTM
2114
CALL
DELISTED
NxStage Medical Inc.
NXTM
| $558K | ﹤0.01% |
195
-5
| -3% | -$142 |
|
|
P
2115
CALL
Everpure Inc
P
$24.8B
| $557K | ﹤0.01% |
347
+84
| +32% | +$1.66K |
|
|
CEO
2116
DELISTED
CNOOC Limited
CEO
| $557K | ﹤0.01% |
3,658
-4,396
| -55% | -$748K |
|
2117
PUT
EPAM Systems
EPAM
$4.69B
| $556K | ﹤0.01% |
48
-138
| -74% | -$16.9K |
|
2118
CALL
TG Therapeutics
TGTX
$8.58B
| $556K | ﹤0.01% |
1,357
-393
| -22% | -$1.95K |
|
|
QVCGA
2119
PUT
DELISTED
QVC Group Inc Series A
QVCGA
| $556K | ﹤0.01% |
6
| – | – |
|
2120
Acadia Pharmaceuticals
ACAD
$4.25B
| $555K | ﹤0.01% |
34,376
-697
| -2% | -$13.5K |
|
2121
Brinker International
EAT
$8.02B
| $555K | ﹤0.01% |
+12,631
| New | +$600K |
|
2122
PUT
Star Bulk Carriers
SBLK
$3.14B
| $555K | ﹤0.01% |
608
-150
| -20% | -$1.64K |
|
|
GWR
2123
PUT
DELISTED
Genesee & Wyoming Inc.
GWR
| $555K | ﹤0.01% |
75
+58
| +341% | +$4.65K |
|
2124
Canadian Pacific Kansas City
CP
$82B
| $554K | ﹤0.01% |
15,615
+265
| +2% | +$10.6K |
|
2125
Okta
OKTA
$24.1B
| $554K | ﹤0.01% |
8,687
-14,211
| -62% | -$842K |
|
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.