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 | |
|---|---|---|---|---|---|---|
751
CALL
Occidental Petroleum
OXY
$56.8B
| $5.52M | 0.01% |
2,988
-3,397
| -53% | -$85K |
|
752
PUT
Credit Acceptance
CACC
$6.01B
| $5.51M | 0.01% |
153
+37
| +32% | +$13.4K |
|
753
CALL
ScottsMiracle-Gro
SMG
$4.05B
| $5.51M | 0.01% |
225
+104
| +86% | +$23.5K |
|
754
CALL
Keysight
KEYS
$54B
| $5.51M | 0.01% |
384
+41
| +12% | +$5.81K |
|
755
CALL
Stellantis
STLA
$16.5B
| $5.5M | 0.01% |
+3,092
| New | +$52K |
|
756
CALL
Oneok
OKE
$58.8B
| $5.5M | 0.01% |
1,085
+34
| +3% | +$1.54K |
|
757
CALL
Invesco DB Base Metals Fund
DBB
$306M
| $5.47M | 0.01% |
3,227
+2,817
| +687% | +$51.2K |
|
758
CALL
Vistra
VST
$55B
| $5.47M | 0.01% |
3,096
+2,107
| +213% | +$41.9K |
|
759
CALL
Lumentum
LITE
$59.2B
| $5.47M | 0.01% |
+599
| New | +$55.4K |
|
760
CALL
C.H. Robinson
CHRW
$22.1B
| $5.47M | 0.01% |
573
-488
| -46% | -$45.6K |
|
|
NKLA
761
CALL
DELISTED
Nikola Corporation Common Stock
NKLA
| $5.46M | 0.01% |
131
-92
| -41% | -$52.4K |
|
|
ME
762
CALL
DELISTED
23andMe Holding Co
ME
| $5.46M | 0.01% |
268
+252
| +1,575% | +$61.5K |
|
763
CALL
Dollar Tree
DLTR
$23.3B
| $5.45M | 0.01% |
+476
| New | +$51.1K |
|
|
ALXN
764
DELISTED
Alexion Pharmaceuticals
ALXN
| $5.44M | 0.01% |
35,556
-46,581
| -57% | -$7.21M |
|
765
KraneShares CSI China Internet ETF
KWEB
$5.2B
| $5.41M | 0.01% |
+70,809
| New | +$6.2M |
|
766
PUT
Clorox
CLX
$11.6B
| $5.4M | 0.01% |
280
-436
| -61% | -$83.9K |
|
767
CALL
SelectQuote
SLQT
$113M
| $5.4M | 0.01% |
1,830
+701
| +62% | +$18.4K |
|
768
Peloton Interactive
PTON
$2.63B
| $5.39M | 0.01% |
+47,982
| New | +$6.37M |
|
769
CALL
Emerson Electric
EMR
$82.6B
| $5.39M | 0.01% |
597
-355
| -37% | -$30.5K |
|
770
CALL
Invesco CurrencyShares Canadian Dollar Trust
FXC
$69.3M
| $5.38M | 0.01% |
689
+315
| +84% | +$24.5K |
|
|
PPLC
771
CALL
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $5.37M | 0.01% |
998
-584
| -37% | -$3.14M |
|
772
PUT
Ally Financial
ALLY
$12.9B
| $5.36M | 0.01% |
1,186
+476
| +67% | +$19.9K |
|
773
PUT
Camping World
CWH
$367M
| $5.33M | 0.01% |
1,465
-49
| -3% | -$1.74K |
|
774
Nokia
NOK
$50.5B
| $5.32M | 0.01% |
1,343,769
+1,243,948
| +1,246% | +$5.19M |
|
775
PUT
Palo Alto Networks
PANW
$263B
| $5.31M | 0.01% |
990
-2,562
| -72% | -$152K |
|
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.