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 | |
|---|---|---|---|---|---|---|
|
DENN
4201
CALL
DELISTED
Denny's
DENN
| $284K | ﹤0.01% |
157
-183
| -54% | -$3.11K |
|
|
ORIO
4202
PUT
Orion Digital Corp
ORIO
$15.7M
| $284K | ﹤0.01% |
+112
| New | +$2.44K |
|
4203
PUT
Insperity
NSP
$2.03B
| $284K | ﹤0.01% |
34
-125
| -79% | -$10.6K |
|
4204
PUT
Simmons First National
SFNC
$3.39B
| $284K | ﹤0.01% |
96
+74
| +336% | +$2.08K |
|
4205
CALL
TE Connectivity
TEL
$60B
| $284K | ﹤0.01% |
22
-59
| -73% | -$7.58K |
|
4206
PUT
Ascendis Pharma A/S
ASND
$16.5B
| $283K | ﹤0.01% |
22
+21
| +2,100% | +$3.19K |
|
4207
CALL
FNB Corp
FNB
$6.76B
| $283K | ﹤0.01% |
223
-77
| -26% | -$890 |
|
|
ORBC
4208
CALL
DELISTED
ORBCOMM, Inc.
ORBC
| $283K | ﹤0.01% |
372
-189
| -34% | -$1.49K |
|
4209
KKR & Co
KKR
$89.1B
| $282K | ﹤0.01% |
5,790
-19,227
| -77% | -$860K |
|
4210
VanEck Agribusiness ETF
MOO
$992M
| $282K | ﹤0.01% |
3,223
+1,032
| +47% | +$87.3K |
|
|
UMPQ
4211
PUT
DELISTED
Umpqua Holdings Corp
UMPQ
| $282K | ﹤0.01% |
161
+109
| +210% | +$1.84K |
|
|
BDN
4212
PUT
Brandywine Realty Trust
BDN
$505M
| $281K | ﹤0.01% |
218
+216
| +10,800% | +$2.64K |
|
4213
Eastern Bankshares
EBC
$5.27B
| $281K | ﹤0.01% |
14,613
-45,614
| -76% | -$793K |
|
4214
Generac Holdings
GNRC
$11.5B
| $281K | ﹤0.01% |
860
+69
| +9% | +$20.3K |
|
4215
PUT
ITT
ITT
$17.1B
| $281K | ﹤0.01% |
31
+6
| +24% | +$495 |
|
4216
PUT
Robert Half
RHI
$4.11B
| $281K | ﹤0.01% |
36
-201
| -85% | -$14.6K |
|
4217
CALL
VEON
VEON
$3.5B
| $281K | ﹤0.01% |
64
+46
| +256% | +$2.02K |
|
|
VRNT
4218
PUT
DELISTED
Verint Systems
VRNT
| $281K | ﹤0.01% |
383
-620
| -62% | -$27.7K |
|
|
AXU
4219
PUT
DELISTED
Alexco Resource Corp
AXU
| $281K | ﹤0.01% |
1,123
+1,074
| +2,192% | +$2.95K |
|
4220
PUT
Apyx Medical
APYX
$162M
| $280K | ﹤0.01% |
+290
| New | +$2.9K |
|
4221
VanEck Social Sentiment ETF
BUZZ
$85.7M
| $280K | ﹤0.01% |
+11,604
| New | +$281K |
|
|
EFC
4222
PUT
Ellington Financial
EFC
$1.69B
| $280K | ﹤0.01% |
175
+47
| +37% | +$741 |
|
4223
PUT
Hess Midstream
HESM
$5.19B
| $280K | ﹤0.01% |
+125
| New | +$2.69K |
|
4224
CALL
Hubbell
HUBB
$24.4B
| $280K | ﹤0.01% |
15
-30
| -67% | -$5.19K |
|
4225
CALL
Kimbell Royalty Partners
KRP
$1.46B
| $280K | ﹤0.01% |
277
+273
| +6,825% | +$2.63K |
|
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.