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 | Miscellaneous | 97.22% |
| 2 | Technology | 0.66% |
| 3 | Consumer Discretionary | 0.49% |
| 4 | Healthcare | 0.33% |
| 5 | Financials | 0.3% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
526
CALL
Skyworks Solutions
SWKS
$11.1B
| $8.49M | 0.02% |
463
-864
| -65% | -$150K |
|
527
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.5B
| $8.47M | 0.02% |
178
-258
| -59% | -$118K |
|
528
CALL
Teck Resources
TECK
$33.9B
| $8.46M | 0.02% |
4,410
+73
| +2% | +$1.48K |
|
529
ServiceNow
NOW
$146B
| $8.44M | 0.02% |
84,355
+72,140
| +591% | +$7.62M |
|
530
CALL
Johnson Controls International
JCI
$87.8B
| $8.43M | 0.02% |
1,413
+977
| +224% | +$53.7K |
|
531
Southwest Airlines
LUV
$19.4B
| $8.4M | 0.02% |
137,557
-16,626
| -11% | -$885K |
|
|
CGC
532
PUT
Canopy Growth
CGC
$437M
| $8.39M | 0.02% |
262
+154
| +143% | +$54.5K |
|
533
CALL
Dave & Buster's
PLAY
$303M
| $8.32M | 0.01% |
1,737
+986
| +131% | +$38.5K |
|
534
PUT
Roblox
RBLX
$30.9B
| $8.3M | 0.01% |
+1,281
| New | +$89.3K |
|
535
CALL
Coupang
CPNG
$27.5B
| $8.3M | 0.01% |
+1,682
| New | +$77.7K |
|
536
PUT
General Dynamics
GD
$97.2B
| $8.3M | 0.01% |
457
-325
| -42% | -$53.1K |
|
537
CALL
MP Materials
MP
$9.71B
| $8.28M | 0.01% |
2,302
+926
| +67% | +$34.2K |
|
538
CALL
Medtronic
MDT
$120B
| $8.26M | 0.01% |
699
+186
| +36% | +$21.8K |
|
539
CALL
Virgin Galactic
SPCE
$461M
| $8.24M | 0.01% |
135
-1
| -0.7% | -$753 |
|
540
PUT
Vail Resorts
MTN
$4.81B
| $8.22M | 0.01% |
282
-2
| -0.7% | -$582 |
|
|
STZ.B
541
CALL
DELISTED
CONSTELLATION BRANDS, INC. CLASS B
STZ.B
| $8.19M | 0.01% |
359
-107
| -23% | -$24.3K |
|
542
PUT
QuidelOrtho
QDEL
$958M
| $8.14M | 0.01% |
636
+330
| +108% | +$60.9K |
|
543
PUT
Acadia Pharmaceuticals
ACAD
$4.83B
| $8.12M | 0.01% |
+3,148
| New | +$139K |
|
544
CALL
NetEase
NTES
$76.4B
| $8.12M | 0.01% |
786
-152
| -16% | -$17.2K |
|
545
Microsoft
MSFT
$3.71T
| $8.1M | 0.01% |
34,341
+34,291
| +68,582% | +$7.96M |
|
546
CALL
Apollo Global Management
APO
$78.9B
| $8.09M | 0.01% |
1,720
+1,002
| +140% | +$48.8K |
|
547
CALL
Corning
GLW
$133B
| $8.07M | 0.01% |
1,856
+253
| +16% | +$9.73K |
|
548
CALL
Bank of Montreal
BMO
$122B
| $8M | 0.01% |
898
+528
| +143% | +$43.1K |
|
549
PUT
Equinix
EQIX
$102B
| $7.95M | 0.01% |
117
+80
| +216% | +$54.9K |
|
550
PUT
KE Holdings
BEKE
$19.8B
| $7.94M | 0.01% |
1,393
+160
| +13% | +$10.1K |
|
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's Q1 2021 filing shows 2,255 new, 3,360 increased, 3,150 reduced and 1,707 closed positions. Its largest new stake was Pfizer: 464,628 shares worth $16.8M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 2,255 new positions and closed 1,707 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.