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 | Miscellaneous | 97.5% |
| 2 | Communication Services | 0.5% |
| 3 | Consumer Discretionary | 0.49% |
| 4 | Technology | 0.41% |
| 5 | Financials | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1101
PUT
Boston Properties
BXP
$10.8B
| $1.97M | 0.01% |
175
-100
| -36% | -$12.1K |
|
|
CLR
1102
PUT
DELISTED
CONTINENTAL RESOURCES INC.
CLR
| $1.97M | 0.01% |
490
+185
| +61% | +$9.46K |
|
1103
CALL
Pinnacle West Capital
PNW
$11.8B
| $1.97M | 0.01% |
231
+210
| +1,000% | +$18.1K |
|
|
DOCU
1104
PUT
DocuSign
DOCU
$13.1B
| $1.97M | 0.01% |
491
-399
| -45% | -$16.8K |
|
1105
CALL
AstraZeneca
AZN
$252B
| $1.96M | 0.01% |
259
-396
| -60% | -$30.9K |
|
|
DNB
1106
DELISTED
Dun & Bradstreet
DNB
| $1.96M | 0.01% |
13,753
-2,142
| -13% | -$305K |
|
1107
PVH
PVH
$3.43B
| $1.96M | 0.01% |
21,075
+18,409
| +691% | +$2.11M |
|
1108
CALL
UBS Group
UBS
$170B
| $1.96M | 0.01% |
1,582
+954
| +152% | +$12.9K |
|
1109
MGM Resorts International
MGM
$10.4B
| $1.96M | 0.01% |
80,692
-59,075
| -42% | -$1.54M |
|
1110
PUT
S&P Global
SPGI
$131B
| $1.95M | 0.01% |
115
+28
| +32% | +$5.02K |
|
1111
CALL
Wolfspeed
WOLF
$1.47B
| $1.95M | 0.01% |
457
+163
| +55% | +$6.61K |
|
|
KYNB
1112
CALL
Kyntra Bio
KYNB
$34.6M
| $1.95M | 0.01% |
17
+11
| +183% | +$12.4K |
|
1113
PUT
KKR & Co
KKR
$96.7B
| $1.95M | 0.01% |
995
+709
| +248% | +$16.2K |
|
1114
CALL
Hilton Worldwide
HLT
$70B
| $1.95M | 0.01% |
272
-1,057
| -80% | -$76.4K |
|
1115
CALL
OSI Systems
OSIS
$3.25B
| $1.95M | 0.01% |
266
+93
| +54% | +$6.71K |
|
|
AIV
1116
PUT
Aimco
AIV
$372M
| $1.95M | 0.01% |
+3,333
| New | +$19.8K |
|
1117
CALL
Assured Guaranty
AGO
$3.33B
| $1.94M | 0.01% |
508
+464
| +1,055% | +$18.5K |
|
1118
PUT
Encompass Health
EHC
$12B
| $1.94M | 0.01% |
396
+102
| +35% | +$5.8K |
|
1119
CALL
Planet Fitness
PLNT
$3.84B
| $1.94M | 0.01% |
362
+236
| +187% | +$12.1K |
|
1120
PUT
Alcoa
AA
$13.2B
| $1.94M | 0.01% |
730
+120
| +20% | +$4.04K |
|
1121
CALL
Weibo
WB
$1.65B
| $1.93M | 0.01% |
331
-75
| -18% | -$4.54K |
|
1122
CALL
Smith & Wesson
SWBI
$578M
| $1.93M | 0.01% |
1,955
+452
| +30% | +$4.69K |
|
|
LSI
1123
DELISTED
Life Storage, Inc.
LSI
| $1.93M | 0.01% |
31,062
+24,040
| +342% | +$1.52M |
|
|
BZUN
1124
PUT
Baozun
BZUN
$167M
| $1.92M | 0.01% |
656
-319
| -33% | -$11.8K |
|
1125
iShares Preferred and Income Securities ETF
PFF
$12.9B
| $1.91M | 0.01% |
+55,884
| New | +$1.98M |
|
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 1,572 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 Miscellaneous at 97% of assets, up from 95% a quarter earlier, followed by Communication Services and Consumer Discretionary.
- 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 1,572 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.