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 | |
|---|---|---|---|---|---|---|
501
CALL
EOG Resources
EOG
$77.5B
| $9.18M | 0.02% |
1,266
-635
| -33% | -$40.5K |
|
502
CALL
Novartis
NVS
$297B
| $9.18M | 0.02% |
1,074
-369
| -26% | -$33.1K |
|
503
PUT
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $9.18M | 0.02% |
3,657
-3,080
| -46% | -$75.6K |
|
|
UCD
504
CALL
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $9.18M | 0.02% |
16,555
-6,104
| -27% | -$3.38M |
|
505
CALL
Palo Alto Networks
PANW
$265B
| $9.11M | 0.02% |
1,698
-1,158
| -41% | -$68.8K |
|
506
CALL
International Paper
IP
$20.1B
| $9.11M | 0.02% |
1,778
+700
| +65% | +$34.1K |
|
507
PUT
Humana
HUM
$47.4B
| $9.1M | 0.02% |
217
-177
| -45% | -$70.7K |
|
508
PUT
Synopsys
SNPS
$71.5B
| $9.09M | 0.02% |
367
+55
| +18% | +$14K |
|
509
General Motors
GM
$73B
| $9.05M | 0.02% |
157,528
-198,114
| -56% | -$10.5M |
|
510
CALL
Kimberly-Clark
KMB
$35.6B
| $8.98M | 0.02% |
646
-747
| -54% | -$99.1K |
|
511
PUT
AutoNation
AN
$6.86B
| $8.89M | 0.02% |
954
+433
| +83% | +$34.7K |
|
512
Pinterest
PINS
$12.3B
| $8.86M | 0.02% |
+119,718
| New | +$8.9M |
|
513
PUT
S&P Global
SPGI
$124B
| $8.86M | 0.02% |
+251
| New | +$83.5K |
|
514
CALL
Global Payments
GPN
$21.3B
| $8.85M | 0.02% |
439
-222
| -34% | -$44.2K |
|
515
CALL
CME Group
CME
$91.9B
| $8.8M | 0.02% |
431
-163
| -27% | -$32.1K |
|
|
PXD
516
CALL
DELISTED
Pioneer Natural Resource Co.
PXD
| $8.8M | 0.02% |
554
-399
| -42% | -$56.7K |
|
517
CALL
WIX.com
WIX
$2.04B
| $8.74M | 0.02% |
313
+162
| +107% | +$46.3K |
|
518
CALL
Royal Bank of Canada
RY
$290B
| $8.7M | 0.02% |
944
+40
| +4% | +$3.48K |
|
|
519
CALL
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $8.67M | 0.02% |
3,488
-2,773
| -44% | -$68K |
|
520
PUT
Medtronic
MDT
$105B
| $8.61M | 0.02% |
729
-1,882
| -72% | -$221K |
|
521
CALL
ProShares UltraShort Health Care
RXD
$3.3M
| $8.6M | 0.02% |
4,969
+251
| +5% | +$9.08K |
|
522
PUT
Kraft Heinz
KHC
$30.1B
| $8.6M | 0.02% |
2,149
+57
| +3% | +$2.05K |
|
523
CALL
StoneCo
STNE
$2.67B
| $8.56M | 0.02% |
1,399
+728
| +108% | +$56.8K |
|
524
CALL
HDFC Bank
HDB
$119B
| $8.52M | 0.02% |
2,194
+1,160
| +112% | +$45.5K |
|
525
CALL
iQIYI
IQ
$1.17B
| $8.51M | 0.02% |
5,123
-228
| -4% | -$5.27K |
|
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.