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 | |
|---|---|---|---|---|---|---|
2276
CALL
Banco Bradesco
BBD
$38.1B
| $478K | ﹤0.01% |
773
-965
| -56% | -$5.6K |
|
2277
PUT
HUB Group
HUBG
$3.01B
| $478K | ﹤0.01% |
+258
| New | +$5.53K |
|
2278
ProShares Short VIX Short-Term Futures ETF
SVXY
$220M
| $478K | ﹤0.01% |
22,632
+15,062
| +199% | +$370K |
|
2279
CALL
Telephone and Data Systems
TDS
$3.91B
| $478K | ﹤0.01% |
147
+102
| +227% | +$3.38K |
|
2280
CALL
Glaukos
GKOS
$9.02B
| $477K | ﹤0.01% |
85
-90
| -51% | -$5.41K |
|
2281
PUT
Mercury Systems
MRCY
$6.2B
| $477K | ﹤0.01% |
101
+80
| +381% | +$3.9K |
|
2282
CALL
Trimble
TRMB
$12.3B
| $477K | ﹤0.01% |
145
+107
| +282% | +$3.94K |
|
|
CYOU
2283
CALL
DELISTED
Changyou.com Limited American Depositary Share
CYOU
| $477K | ﹤0.01% |
261
+207
| +383% | +$3.43K |
|
2284
Olin
OLN
$2.64B
| $476K | ﹤0.01% |
23,702
+7,962
| +51% | +$170K |
|
|
YRD
2285
PUT
Yiren Digital
YRD
$103M
| $476K | ﹤0.01% |
443
-72
| -14% | -$1.13K |
|
2286
Bilibili
BILI
$7.18B
| $474K | ﹤0.01% |
32,493
+19,055
| +142% | +$267K |
|
2287
PUT
Zscaler
ZS
$23B
| $474K | ﹤0.01% |
121
-279
| -70% | -$10.5K |
|
2288
PUT
Guidewire Software
GWRE
$11.5B
| $473K | ﹤0.01% |
59
-23
| -28% | -$2K |
|
|
ARCH
2289
PUT
DELISTED
Arch Resources, Inc.
ARCH
| $473K | ﹤0.01% |
57
-15
| -21% | -$1.33K |
|
2290
PUT
Sherwin-Williams
SHW
$78.3B
| $472K | ﹤0.01% |
36
-195
| -84% | -$26.3K |
|
|
GLUU
2291
CALL
DELISTED
Glu Mobile Inc.
GLUU
| $472K | ﹤0.01% |
585
+488
| +503% | +$3.47K |
|
2292
PUT
Cirrus Logic
CRUS
$6.74B
| $471K | ﹤0.01% |
142
+12
| +9% | +$445 |
|
2293
CALL
Red Rock Resorts
RRR
$3.74B
| $471K | ﹤0.01% |
232
+225
| +3,214% | +$5.29K |
|
|
STMP
2294
DELISTED
Stamps.com, Inc.
STMP
| $471K | ﹤0.01% |
+3,027
| New | +$539K |
|
2295
CALL
AMN Healthcare
AMN
$1.28B
| $470K | ﹤0.01% |
83
+3
| +4% | +$168 |
|
2296
PUT
Navigator Holdings
NVGS
$1.34B
| $470K | ﹤0.01% |
500
-257
| -34% | -$2.96K |
|
2297
CALL
PagSeguro Digital
PAGS
$2.57B
| $470K | ﹤0.01% |
251
-1,147
| -82% | -$28.1K |
|
2298
TE Connectivity
TEL
$58.8B
| $470K | ﹤0.01% |
6,226
+6,082
| +4,224% | +$468K |
|
2299
PUT
Arrowhead Research
ARWR
$12.1B
| $469K | ﹤0.01% |
378
-52
| -12% | -$711 |
|
2300
Progressive
PGR
$124B
| $469K | ﹤0.01% |
+7,788
| New | +$518K |
|
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.