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 | |
|---|---|---|---|---|---|---|
|
XEC
2201
PUT
DELISTED
CIMAREX ENERGY CO
XEC
| $517K | ﹤0.01% |
84
-125
| -60% | -$10.3K |
|
2202
PUT
Sinclair Inc
SBGI
$974M
| $516K | ﹤0.01% |
196
-23
| -11% | -$671 |
|
|
OAK
2203
PUT
DELISTED
OAKTREE CAPITAL GROUP, LLC
OAK
| $516K | ﹤0.01% |
130
+63
| +94% | +$2.59K |
|
2204
PUT
Owens Corning
OC
$11.5B
| $514K | ﹤0.01% |
117
-193
| -62% | -$9.35K |
|
2205
CALL
Xylem
XYL
$28.5B
| $513K | ﹤0.01% |
77
+15
| +24% | +$1.04K |
|
|
SFIX
2206
CALL
Stitch Fix
SFIX
$478M
| $512K | ﹤0.01% |
300
-793
| -73% | -$19.6K |
|
2207
Vale
VALE
$62.9B
| $512K | ﹤0.01% |
+38,880
| New | +$556K |
|
2208
AerCap
AER
$23.9B
| $511K | ﹤0.01% |
+12,908
| New | +$646K |
|
|
NVTA
2209
DELISTED
Invitae Corporation
NVTA
| $511K | ﹤0.01% |
46,266
-21,248
| -31% | -$275K |
|
2210
CALL
Henry Schein
HSIC
$9.74B
| $510K | ﹤0.01% |
83
+41
| +98% | +$2.7K |
|
2211
Invesco
IVZ
$13.3B
| $510K | ﹤0.01% |
+30,473
| New | +$610K |
|
2212
PUT
MGIC Investment
MTG
$6.27B
| $510K | ﹤0.01% |
488
+478
| +4,780% | +$5.59K |
|
2213
PUT
Insmed
INSM
$23.2B
| $509K | ﹤0.01% |
388
-191
| -33% | -$3.05K |
|
|
SF
2214
CALL
Stifel
SF
$12.3B
| $509K | ﹤0.01% |
277
-173
| -38% | -$3.58K |
|
2215
PUT
Healthpeak Properties
DOC
$15.4B
| $508K | ﹤0.01% |
182
+138
| +314% | +$3.82K |
|
2216
PUT
PACCAR
PCAR
$69.6B
| $508K | ﹤0.01% |
134
-228
| -63% | -$9.1K |
|
|
EPAY
2217
PUT
DELISTED
Bottomline Technologies Inc
EPAY
| $508K | ﹤0.01% |
106
+64
| +152% | +$3.7K |
|
2218
CALL
Deluxe
DLX
$1.19B
| $507K | ﹤0.01% |
132
| – | – |
|
2219
EQT Corp
EQT
$33.2B
| $507K | ﹤0.01% |
26,857
+492
| +2% | +$9.99K |
|
|
THS
2220
PUT
DELISTED
Treehouse Foods
THS
| $507K | ﹤0.01% |
100
+13
| +15% | +$641 |
|
|
AXDX
2221
PUT
DELISTED
Accelerate Diagnostics
AXDX
| $506K | ﹤0.01% |
44
+7
| +19% | +$1.04K |
|
2222
CALL
Flowers Foods
FLO
$1.64B
| $506K | ﹤0.01% |
274
+20
| +8% | +$383 |
|
|
ZUO
2223
CALL
DELISTED
Zuora, Inc.
ZUO
| $506K | ﹤0.01% |
279
-356
| -56% | -$6.84K |
|
2224
PUT
Alkermes
ALKS
$8.82B
| $504K | ﹤0.01% |
171
-26
| -13% | -$958 |
|
2225
CALL
Middleby
MIDD
$6.05B
| $503K | ﹤0.01% |
49
+25
| +104% | +$2.85K |
|
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.