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 | |
|---|---|---|---|---|---|---|
|
LNW
1026
CALL
DELISTED
Light & Wonder
LNW
| $2.2M | 0.01% |
1,230
+329
| +37% | +$6.64K |
|
1027
PUT
Moody's
MCO
$82.5B
| $2.2M | 0.01% |
157
+1
| +0.6% | +$151 |
|
1028
PUT
HDFC Bank
HDB
$120B
| $2.2M | 0.01% |
848
+32
| +4% | +$756 |
|
1029
CALL
Novartis
NVS
$296B
| $2.19M | 0.01% |
285
-88
| -24% | -$6.85K |
|
1030
CALL
Diageo
DEO
$46.3B
| $2.18M | 0.01% |
154
+55
| +56% | +$7.74K |
|
1031
PUT
Nutrien
NTR
$32.6B
| $2.18M | 0.01% |
464
+259
| +126% | +$13.5K |
|
1032
PUT
Five Below
FIVE
$11.3B
| $2.18M | 0.01% |
213
-128
| -38% | -$14.1K |
|
|
FDC
1033
CALL
DELISTED
First Data Corporation
FDC
| $2.18M | 0.01% |
1,289
-373
| -22% | -$7.27K |
|
|
CS
1034
CALL
DELISTED
Credit Suisse Group
CS
| $2.18M | 0.01% |
2,006
+1,747
| +675% | +$21.6K |
|
1035
CALL
Post Holdings
POST
$4.15B
| $2.17M | 0.01% |
373
-40
| -10% | -$2.41K |
|
1036
CALL
Northern Trust
NTRS
$22.2B
| $2.16M | 0.01% |
259
+209
| +418% | +$19.6K |
|
1037
PUT
Interactive Brokers
IBKR
$40.9B
| $2.16M | 0.01% |
1,580
+484
| +44% | +$6.46K |
|
1038
CALL
Clorox
CLX
$11.5B
| $2.16M | 0.01% |
140
-31
| -18% | -$4.83K |
|
1039
CALL
Travelers Companies
TRV
$80.6B
| $2.15M | 0.01% |
180
-81
| -31% | -$10.1K |
|
1040
CALL
Restaurant Brands International
QSR
$25.3B
| $2.15M | 0.01% |
411
-28
| -6% | -$1.55K |
|
1041
PUT
Hilton Worldwide
HLT
$74.2B
| $2.15M | 0.01% |
299
+60
| +25% | +$4.33K |
|
1042
PUT
Westlake Corp
WLK
$9.51B
| $2.14M | 0.01% |
324
+306
| +1,700% | +$22.1K |
|
1043
PUT
Kimberly-Clark
KMB
$36.2B
| $2.14M | 0.01% |
188
-29
| -13% | -$3.22K |
|
1044
PUT
Aramark
ARMK
$15.2B
| $2.14M | 0.01% |
1,024
+748
| +271% | +$19.4K |
|
1045
CALL
Alnylam Pharmaceuticals
ALNY
$36.5B
| $2.14M | 0.01% |
293
-323
| -52% | -$24.8K |
|
1046
CALL
The Mosaic Company
MOS
$7.15B
| $2.13M | 0.01% |
730
+98
| +16% | +$3.23K |
|
1047
ServiceNow
NOW
$101B
| $2.13M | 0.01% |
59,860
-67,545
| -53% | -$2.4M |
|
|
ANSS
1048
CALL
DELISTED
Ansys
ANSS
| $2.13M | 0.01% |
149
+3
| +2% | +$466 |
|
|
MIC
1049
CALL
DELISTED
Macquarie Infrastructure Holdings, LLC
MIC
| $2.12M | 0.01% |
581
-28
| -5% | -$1.12K |
|
1050
Xtrackers Harvest CSI 300 China A-Shares ETF
ASHR
$1.36B
| $2.12M | 0.01% |
96,772
-29,383
| -23% | -$684K |
|
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.