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 | |
|---|---|---|---|---|---|---|
2526
American Well
AMWL
$185M
| $904K | ﹤0.01% |
+2,604
| New | +$1.41M |
|
2527
PUT
Copa Holdings
CPA
$5.65B
| $904K | ﹤0.01% |
112
+2
| +2% | +$166 |
|
2528
First Trust NASDAQ Clean Edge Green Energy Index Fund
QCLN
$609M
| $903K | ﹤0.01% |
13,168
+13,008
| +8,130% | +$999K |
|
2529
PUT
Brinker International
EAT
$8.38B
| $902K | ﹤0.01% |
127
-204
| -62% | -$13.6K |
|
2530
Hormel Foods
HRL
$14.3B
| $901K | ﹤0.01% |
+18,865
| New | +$892K |
|
|
USCR
2531
CALL
DELISTED
U S Concrete, Inc.
USCR
| $901K | ﹤0.01% |
123
-404
| -77% | -$21.8K |
|
|
MFA
2532
CALL
MFA Financial
MFA
$927M
| $900K | ﹤0.01% |
553
-40
| -7% | -$636 |
|
2533
Banco Santander
SAN
$200B
| $900K | ﹤0.01% |
262,646
+74,952
| +40% | +$254K |
|
2534
PUT
Shutterstock
SSTK
$216M
| $899K | ﹤0.01% |
101
+84
| +494% | +$6.72K |
|
|
TELL
2535
DELISTED
Tellurian Inc.
TELL
| $899K | ﹤0.01% |
384,590
+372,544
| +3,093% | +$1.02M |
|
2536
CALL
Orion
OEC
$379M
| $897K | ﹤0.01% |
455
+369
| +429% | +$6.64K |
|
|
IO
2537
CALL
DELISTED
ION Geophysical Corporation
IO
| $897K | ﹤0.01% |
4,195
+3,816
| +1,007% | +$11.2K |
|
2538
CALL
Banco Bradesco
BBD
$38.5B
| $896K | ﹤0.01% |
2,307
-792
| -26% | -$3.04K |
|
2539
CALL
Carlyle Group
CG
$16.7B
| $896K | ﹤0.01% |
244
-1,431
| -85% | -$50.2K |
|
2540
CALL
PAR Technology
PAR
$682M
| $896K | ﹤0.01% |
137
+64
| +88% | +$4.75K |
|
2541
CALL
SiriusXM
SIRI
$10.5B
| $896K | ﹤0.01% |
147
-60
| -29% | -$3.66K |
|
2542
CALL
AeroVironment
AVAV
$7.81B
| $893K | ﹤0.01% |
77
+27
| +54% | +$3.15K |
|
2543
CALL
Red Robin
RRGB
$136M
| $893K | ﹤0.01% |
224
-43
| -16% | -$1.3K |
|
2544
PUT
Purple Innovation
PRPL
$35.8M
| $892K | ﹤0.01% |
11
-5
| -31% | -$4.34K |
|
|
2545
CALL
Banco Santander
SAN
$200B
| $891K | ﹤0.01% |
+2,599
| New | +$8.81K |
|
2546
United States Gasoline Fund
UGA
$143M
| $891K | ﹤0.01% |
28,289
-4,699
| -14% | -$139K |
|
|
LOGC
2547
DELISTED
ContextLogic
LOGC
| $891K | ﹤0.01% |
1,881
+102
| +6% | +$67.6K |
|
|
MYOV
2548
PUT
DELISTED
Myovant Sciences Ltd.
MYOV
| $891K | ﹤0.01% |
433
-238
| -35% | -$5.42K |
|
2549
Upstart Holdings
UPST
$2.63B
| $890K | ﹤0.01% |
+6,913
| New | +$530K |
|
|
TRTN
2550
PUT
DELISTED
Triton International Limited
TRTN
| $890K | ﹤0.01% |
162
+91
| +128% | +$4.87K |
|
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.