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 | |
|---|---|---|---|---|---|---|
626
CALL
Paycom
PAYC
$6.47B
| $6.7M | 0.01% |
181
-91
| -33% | -$35.9K |
|
627
PUT
Keysight
KEYS
$55.6B
| $6.7M | 0.01% |
467
+163
| +54% | +$23.1K |
|
628
PUT
DXC Technology
DXC
$1.5B
| $6.69M | 0.01% |
2,140
+930
| +77% | +$25.5K |
|
629
Colgate-Palmolive
CL
$72.1B
| $6.69M | 0.01% |
84,844
+34,702
| +69% | +$2.72M |
|
630
CALL
FuelCell Energy
FCEL
$1.86B
| $6.67M | 0.01% |
154
+38
| +33% | +$20.4K |
|
|
ABB
631
CALL
DELISTED
ABB Ltd
ABB
| $6.66M | 0.01% |
2,187
+1,669
| +322% | +$50.1K |
|
632
Li Auto
LI
$12.9B
| $6.64M | 0.01% |
265,627
-118,889
| -31% | -$3.44M |
|
|
633
CALL
Li Auto
LI
$12.9B
| $6.63M | 0.01% |
2,653
-1,689
| -39% | -$48.8K |
|
|
K
634
PUT
DELISTED
Kellanova
K
| $6.63M | 0.01% |
1,115
-46
| -4% | -$2.57K |
|
635
PUT
Ubiquiti
UI
$32B
| $6.62M | 0.01% |
222
-40
| -15% | -$12.6K |
|
636
PUT
CF Industries
CF
$19.5B
| $6.62M | 0.01% |
1,459
+737
| +102% | +$33.3K |
|
637
PUT
Cigna
CI
$75.7B
| $6.6M | 0.01% |
273
-391
| -59% | -$87.2K |
|
638
CALL
Molson Coors Class B
TAP
$7.51B
| $6.6M | 0.01% |
1,290
+190
| +17% | +$9.23K |
|
|
ZEN
639
PUT
DELISTED
ZENDESK INC
ZEN
| $6.59M | 0.01% |
497
-356
| -42% | -$51K |
|
|
IPOF
640
PUT
DELISTED
Social Capital Hedosophia Holdings Corp. VI
IPOF
| $6.59M | 0.01% |
6,153
+5,087
| +477% | +$68.5K |
|
641
CALL
Bunge Global
BG
$23.7B
| $6.59M | 0.01% |
831
+204
| +33% | +$15.2K |
|
642
CALL
T. Rowe Price
TROW
$24.6B
| $6.57M | 0.01% |
383
-93
| -20% | -$15.3K |
|
643
CALL
Paychex
PAYX
$39.4B
| $6.57M | 0.01% |
670
-74
| -10% | -$6.82K |
|
644
PUT
Labcorp
LH
$23.9B
| $6.5M | 0.01% |
297
+264
| +800% | +$53K |
|
645
PUT
Waste Management
WM
$95.3B
| $6.5M | 0.01% |
504
+11
| +2% | +$1.29K |
|
646
PUT
Planet Fitness
PLNT
$4.29B
| $6.5M | 0.01% |
841
+336
| +67% | +$26.7K |
|
647
Kohl's
KSS
$2.06B
| $6.49M | 0.01% |
108,878
-59,246
| -35% | -$3.04M |
|
|
CGC
648
CALL
Canopy Growth
CGC
$382M
| $6.49M | 0.01% |
203
-1
| -0.5% | -$354 |
|
649
Rocket Companies
RKT
$36.2B
| $6.48M | 0.01% |
280,550
+206,579
| +279% | +$4.62M |
|
650
CALL
STMicroelectronics
STM
$47.7B
| $6.46M | 0.01% |
1,686
-66
| -4% | -$2.57K |
|
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.