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
|
+$67.5M |
| 2 |
Palantir
PLTR
|
+$64.7M |
| 3 |
PARA
Paramount Global Class B
PARA
|
+$31.5M |
| 4 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$30.7M |
| 5 |
Carnival Corporation Ltd
CCL
|
+$25.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
Tesla
TSLA
|
+$53.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 4 |
Invesco QQQ Trust
QQQ
|
+$37.6M |
| 5 |
AutoZone
AZO
|
+$28.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.65% |
| 2 | Consumer Discretionary | 0.49% |
| 3 | Healthcare | 0.32% |
| 4 | Financials | 0.3% |
| 5 | Industrials | 0.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2176
iShares MSCI Germany ETF
EWG
$1.5B
| $1.21M | ﹤0.01% |
+36,183
| New | +$1.18M |
|
|
NOAH
2177
Noah Holdings
NOAH
$588M
| $1.21M | ﹤0.01% |
27,242
+16,460
| +153% | +$782K |
|
2178
CALL
Ares Capital
ARCC
$13.5B
| $1.21M | ﹤0.01% |
646
-675
| -51% | -$12.1K |
|
2179
PUT
Groupon
GRPN
$980M
| $1.21M | ﹤0.01% |
239
-20
| -8% | -$866 |
|
2180
Rayonier
RYN
$6.49B
| $1.21M | ﹤0.01% |
41,260
+12,151
| +42% | +$358K |
|
2181
PUT
Atmos Energy
ATO
$29.9B
| $1.21M | ﹤0.01% |
122
+69
| +130% | +$6.28K |
|
|
CUK
2182
CALL
DELISTED
Carnival PLC
CUK
| $1.21M | ﹤0.01% |
538
+238
| +79% | +$4.81K |
|
|
PACW
2183
CALL
DELISTED
PacWest Bancorp
PACW
| $1.21M | ﹤0.01% |
316
+205
| +185% | +$7.19K |
|
2184
CALL
Elastic
ESTC
$6.1B
| $1.2M | ﹤0.01% |
108
-326
| -75% | -$46.3K |
|
2185
PUT
Matsons
MATX
$6.37B
| $1.2M | ﹤0.01% |
180
+13
| +8% | +$891 |
|
2186
CALL
Valley National Bancorp
VLY
$7.93B
| $1.2M | ﹤0.01% |
874
+234
| +37% | +$2.82K |
|
2187
CALL
Gold Fields
GFI
$29.2B
| $1.2M | ﹤0.01% |
1,264
-122
| -9% | -$1.14K |
|
2188
National Grid
NGG
$82.7B
| $1.2M | ﹤0.01% |
22,886
+14,282
| +166% | +$745K |
|
2189
CALL
Papa John's
PZZA
$999M
| $1.2M | ﹤0.01% |
135
-118
| -47% | -$11.1K |
|
|
LFC
2190
DELISTED
China Life Insurance Company Ltd.
LFC
| $1.2M | ﹤0.01% |
114,935
+3,732
| +3% | +$40.4K |
|
2191
CALL
Stride
LRN
$3.69B
| $1.2M | ﹤0.01% |
397
-319
| -45% | -$8.28K |
|
2192
PUT
FMC
FMC
$1.42B
| $1.19M | ﹤0.01% |
108
+23
| +27% | +$2.55K |
|
2193
PUT
WD-40
WDFC
$3.1B
| $1.19M | ﹤0.01% |
39
+22
| +129% | +$6.67K |
|
2194
Enbridge
ENB
$124B
| $1.19M | ﹤0.01% |
32,798
+9,898
| +43% | +$348K |
|
|
PTR
2195
PUT
DELISTED
PETROCHINA COMPANY LIMITED ADS (REP 100 H SHARES)
PTR
| $1.19M | ﹤0.01% |
330
+89
| +37% | +$3.08K |
|
2196
CALL
Avnet
AVT
$7.33B
| $1.19M | ﹤0.01% |
287
+41
| +17% | +$1.58K |
|
2197
Cirrus Logic
CRUS
$6.74B
| $1.19M | ﹤0.01% |
14,040
+12,166
| +649% | +$1.05M |
|
2198
PUT
Credicorp
BAP
$30.9B
| $1.19M | ﹤0.01% |
87
+86
| +8,600% | +$13.4K |
|
|
OPI
2199
CALL
DELISTED
Office Properties Income Trust
OPI
| $1.19M | ﹤0.01% |
431
+393
| +1,034% | +$10.2K |
|
2200
CALL
Pitney Bowes
PBI
$2.42B
| $1.18M | ﹤0.01% |
1,437
-973
| -40% | -$8.34K |
|
Similar funds
Simplex Trading's Q1 2021 Portfolio in Review
As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.
- Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
- Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
- Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
- Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
- Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.
Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.