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 | |
|---|---|---|---|---|---|---|
576
CALL
MongoDB
MDB
$24.1B
| $7.43M | 0.01% |
+278
| New | +$98.5K |
|
577
Intel
INTC
$504B
| $7.43M | 0.01% |
116,132
-13,466
| -10% | -$803K |
|
578
PUT
Mirion Technologies
MIR
$4.13B
| $7.43M | 0.01% |
+7,124
| New | +$83.7K |
|
579
PUT
GoodRx Holdings
GDRX
$972M
| $7.42M | 0.01% |
1,903
+150
| +9% | +$6.75K |
|
|
HES
580
CALL
DELISTED
Hess
HES
| $7.4M | 0.01% |
1,046
-1,254
| -55% | -$80.2K |
|
581
PUT
Global Payments
GPN
$21.3B
| $7.34M | 0.01% |
364
+310
| +574% | +$61.8K |
|
582
CALL
Toll Brothers
TOL
$13.7B
| $7.33M | 0.01% |
1,293
+739
| +133% | +$38.7K |
|
583
PUT
Lithia Motors
LAD
$7.62B
| $7.33M | 0.01% |
188
-98
| -34% | -$35.2K |
|
584
PUT
BILL Holdings
BILL
$4.11B
| $7.25M | 0.01% |
498
+153
| +44% | +$22.9K |
|
|
PRPB
585
CALL
DELISTED
CC Neuberger Principal Holdings II Class A Ordinary Shares
PRPB
| $7.24M | 0.01% |
+7,339
| New | +$76.9K |
|
586
PUT
HCA Healthcare
HCA
$83.5B
| $7.19M | 0.01% |
382
-411
| -52% | -$72.5K |
|
587
iShares Global Clean Energy ETF
ICLN
$2.46B
| $7.18M | 0.01% |
295,429
+285,685
| +2,932% | +$7.99M |
|
588
PUT
TransDigm Group
TDG
$67.9B
| $7.17M | 0.01% |
+122
| New | +$71.9K |
|
589
Skyworks Solutions
SWKS
$9.1B
| $7.17M | 0.01% |
39,073
+16,483
| +73% | +$2.86M |
|
|
SAGE
590
PUT
DELISTED
Sage Therapeutics
SAGE
| $7.12M | 0.01% |
951
+677
| +247% | +$55.5K |
|
591
PUT
Mattel
MAT
$4.14B
| $7.12M | 0.01% |
3,573
+1,211
| +51% | +$23.4K |
|
592
PUT
Linde
LIN
$234B
| $7.12M | 0.01% |
254
-752
| -75% | -$195K |
|
|
RDS.A
593
PUT
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $7.1M | 0.01% |
1,844
-1,355
| -42% | -$54.5K |
|
594
CALL
Cedar Fair
FUN
$1.76B
| $7.1M | 0.01% |
1,429
+483
| +51% | +$22K |
|
595
Twilio
TWLO
$28.1B
| $7.05M | 0.01% |
20,704
+17,906
| +640% | +$6.71M |
|
596
Baidu
BIDU
$36.5B
| $7.05M | 0.01% |
32,397
+15,889
| +96% | +$4.15M |
|
597
CALL
Teva Pharmaceuticals
TEVA
$36.3B
| $7.02M | 0.01% |
6,082
+350
| +6% | +$4.01K |
|
598
CALL
Becton Dickinson
BDX
$42.1B
| $7M | 0.01% |
295
+187
| +173% | +$45.7K |
|
|
NVTA
599
PUT
DELISTED
Invitae Corporation
NVTA
| $6.98M | 0.01% |
1,828
-263
| -13% | -$12K |
|
600
CALL
Shift4
FOUR
$3.68B
| $6.98M | 0.01% |
851
+294
| +53% | +$22.9K |
|
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.