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 | |
|---|---|---|---|---|---|---|
|
CELG
151
PUT
DELISTED
Celgene Corp
CELG
| $28.4M | 0.08% |
4,429
+1,232
| +39% | +$90.9K |
|
152
PUT
Intel
INTC
$530B
| $28.4M | 0.08% |
6,042
+3,490
| +137% | +$163K |
|
153
CALL
Deere & Co
DE
$162B
| $28.1M | 0.08% |
1,885
+971
| +106% | +$142K |
|
154
CALL
Union Pacific
UNP
$174B
| $27.5M | 0.08% |
1,989
-580
| -23% | -$85.9K |
|
155
CALL
Merck
MRK
$318B
| $27.5M | 0.08% |
3,771
+1,157
| +44% | +$81.7K |
|
|
STZ.B
156
PUT
DELISTED
CONSTELLATION BRANDS, INC. CLASS B
STZ.B
| $27.5M | 0.08% |
1,708
-428
| -20% | -$86.6K |
|
157
PUT
Procter & Gamble
PG
$348B
| $26.9M | 0.08% |
2,922
-263
| -8% | -$23.5K |
|
158
CALL
Abbott
ABT
$175B
| $26.8M | 0.08% |
3,705
+2,115
| +133% | +$149K |
|
|
AGN
159
PUT
DELISTED
Allergan plc
AGN
| $26.8M | 0.08% |
2,003
+646
| +48% | +$106K |
|
160
CALL
Biogen
BIIB
$29.8B
| $26.5M | 0.08% |
882
-16
| -2% | -$5.11K |
|
|
ATVI
161
CALL
DELISTED
Activision Blizzard
ATVI
| $26.3M | 0.08% |
5,651
+3,059
| +118% | +$183K |
|
162
CALL
Eli Lilly
LLY
$1.03T
| $26.1M | 0.08% |
2,253
+258
| +13% | +$28.8K |
|
163
Netflix
NFLX
$292B
| $26M | 0.08% |
971,630
-25,610
| -3% | -$766K |
|
164
PUT
lululemon athletica
LULU
$12.8B
| $26M | 0.08% |
2,135
-33
| -2% | -$4.42K |
|
165
PUT
Wells Fargo
WFC
$263B
| $26M | 0.08% |
5,633
+2,250
| +67% | +$115K |
|
166
PUT
Workday
WDAY
$33.2B
| $24.5M | 0.07% |
1,537
+1,180
| +331% | +$167K |
|
167
CALL
Automatic Data Processing
ADP
$97.7B
| $24.5M | 0.07% |
1,865
+1,176
| +171% | +$166K |
|
168
CALL
AutoZone
AZO
$49.2B
| $24.3M | 0.07% |
290
+60
| +26% | +$48.1K |
|
169
CALL
3M
MMM
$90.3B
| $24.2M | 0.07% |
1,519
+65
| +4% | +$10.8K |
|
|
170
Invesco QQQ Trust
QQQ
$470B
| $24M | 0.07% |
155,534
-216,272
| -58% | -$36.2M |
|
171
CALL
Morgan Stanley
MS
$343B
| $24M | 0.07% |
6,045
+2,685
| +80% | +$117K |
|
172
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27.1B
| $23.3M | 0.07% |
771
+506
| +191% | +$168K |
|
173
CALL
Bristol-Myers Squibb
BMY
$125B
| $23.2M | 0.07% |
4,454
+1,747
| +65% | +$93.9K |
|
174
PUT
Cisco
CSCO
$446B
| $23.1M | 0.07% |
5,331
+3,353
| +170% | +$153K |
|
175
PUT
Roku
ROKU
$21.3B
| $23.1M | 0.07% |
7,538
-59
| -0.8% | -$2.78K |
|
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.