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 | |
|---|---|---|---|---|---|---|
476
PUT
MongoDB
MDB
$24.1B
| $9.79M | 0.02% |
+366
| New | +$130K |
|
477
PUT
TAL Education Group
TAL
$5.74B
| $9.72M | 0.02% |
1,806
-366
| -17% | -$26.8K |
|
478
CALL
Dell
DELL
$284B
| $9.72M | 0.02% |
2,176
+132
| +6% | +$5.41K |
|
479
PUT
Alcoa
AA
$11.9B
| $9.71M | 0.02% |
2,989
-167
| -5% | -$4.22K |
|
480
CALL
Sabre
SABR
$668M
| $9.69M | 0.02% |
6,545
+4,496
| +219% | +$60.9K |
|
481
CALL
General Mills
GIS
$19B
| $9.68M | 0.02% |
1,579
-820
| -34% | -$47.3K |
|
482
PUT
GoDaddy
GDDY
$11.6B
| $9.66M | 0.02% |
1,245
+519
| +71% | +$41.8K |
|
483
PUT
Wolfspeed
WOLF
$1.35B
| $9.66M | 0.02% |
893
+290
| +48% | +$32.6K |
|
484
CALL
Veeva Systems
VEEV
$29.2B
| $9.61M | 0.02% |
368
-127
| -26% | -$35.4K |
|
485
PUT
Occidental Petroleum
OXY
$57.3B
| $9.61M | 0.02% |
3,806
-6,637
| -64% | -$166K |
|
486
CALL
Cadence Design Systems
CDNS
$91.1B
| $9.6M | 0.02% |
701
+173
| +33% | +$23.2K |
|
487
CALL
Capri Holdings
CPRI
$1.78B
| $9.59M | 0.02% |
1,880
-1,765
| -48% | -$83.1K |
|
488
CALL
Lemonade
LMND
$4.66B
| $9.57M | 0.02% |
1,028
-48
| -4% | -$6.2K |
|
489
PUT
Dropbox
DBX
$6.63B
| $9.53M | 0.02% |
3,574
+774
| +28% | +$18.6K |
|
490
PUT
Dollar Tree
DLTR
$22.6B
| $9.5M | 0.02% |
+830
| New | +$89.2K |
|
491
CALL
Fastly Inc
FSLY
$3.04B
| $9.48M | 0.02% |
1,409
-2,103
| -60% | -$181K |
|
492
GE Aerospace
GE
$362B
| $9.45M | 0.02% |
144,443
+123,082
| +576% | +$7.45M |
|
493
CALL
C3.ai
AI
$1.27B
| $9.44M | 0.02% |
1,433
+1,056
| +280% | +$123K |
|
494
PUT
CME Group
CME
$91.9B
| $9.39M | 0.02% |
460
+259
| +129% | +$51K |
|
|
495
PUT
Dell
DELL
$284B
| $9.39M | 0.02% |
2,101
+156
| +8% | +$6.39K |
|
496
CALL
Kraft Heinz
KHC
$30.1B
| $9.37M | 0.02% |
2,343
+1,182
| +102% | +$42.6K |
|
497
CALL
Cigna
CI
$75.7B
| $9.36M | 0.02% |
387
+57
| +17% | +$12.7K |
|
498
TSMC
TSM
$2.16T
| $9.34M | 0.02% |
78,947
+57,613
| +270% | +$7.14M |
|
499
CALL
General Dynamics
GD
$103B
| $9.33M | 0.02% |
514
+156
| +44% | +$25.5K |
|
500
CALL
Box
BOX
$3.92B
| $9.26M | 0.02% |
4,031
+1,852
| +85% | +$36.1K |
|
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.