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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2701
STMicroelectronics
STM
$46B
| $1.26M | ﹤0.01% |
42,435
+10,465
| +33% | +$346K |
|
2702
CALL
CoinShares ETF Trust CoinShares Bitcoin Mining ETF
WGMI
$247M
| $1.26M | ﹤0.01% |
66,800
+13,800
| +26% | +$272K |
|
2703
PUT
Wendy's
WEN
$1.33B
| $1.26M | ﹤0.01% |
71,900
-17,800
| -20% | -$303K |
|
2704
CALL
Quest Diagnostics
DGX
$25.1B
| $1.26M | ﹤0.01% |
8,100
-21,900
| -73% | -$3.27M |
|
2705
PUT
Dorian LPG
LPG
$1.94B
| $1.26M | ﹤0.01% |
36,500
+7,800
| +27% | +$295K |
|
|
NNDM
2706
PUT
Nano Dimension
NNDM
$309M
| $1.25M | ﹤0.01% |
512,600
+489,100
| +2,081% | +$1.1M |
|
|
HCP
2707
DELISTED
HashiCorp, Inc. Class A Common Stock
HCP
| $1.25M | ﹤0.01% |
37,041
+11,161
| +43% | +$376K |
|
2708
CALL
Century Aluminum
CENX
$4.57B
| $1.24M | ﹤0.01% |
76,600
-23,900
| -24% | -$362K |
|
2709
PUT
Aaon
AAON
$8.41B
| $1.24M | ﹤0.01% |
11,500
-200
| -2% | -$18.3K |
|
|
LINE
2710
PUT
Lineage Inc
LINE
$9.43B
| $1.24M | ﹤0.01% |
+15,800
| New | +$1.32M |
|
2711
CALL
Sana Biotechnology
SANA
$885M
| $1.24M | ﹤0.01% |
297,500
+296,000
| +19,733% | +$1.56M |
|
2712
CALL
NovoCure
NVCR
$2.04B
| $1.24M | ﹤0.01% |
79,100
+28,600
| +57% | +$519K |
|
2713
PUT
RingCentral
RNG
$4.05B
| $1.24M | ﹤0.01% |
39,100
-60,100
| -61% | -$1.9M |
|
2714
Sunoco
SUN
$14.2B
| $1.24M | ﹤0.01% |
23,029
+14,771
| +179% | +$801K |
|
|
ITCI
2715
PUT
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $1.24M | ﹤0.01% |
16,900
-11,300
| -40% | -$849K |
|
2716
Futu Holdings
FUTU
$13.9B
| $1.24M | ﹤0.01% |
12,918
-17,053
| -57% | -$1.09M |
|
|
AY
2717
PUT
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $1.23M | ﹤0.01% |
56,100
-88,500
| -61% | -$1.95M |
|
2718
PUT
Ginkgo Bioworks
DNA
$481M
| $1.23M | ﹤0.01% |
151,200
+142,485
| +1,635% | +$1.43M |
|
2719
PUT
Humacyte
HUMA
$168M
| $1.23M | ﹤0.01% |
226,500
+135,300
| +148% | +$892K |
|
2720
CALL
Newell Brands
NWL
$2.16B
| $1.23M | ﹤0.01% |
160,500
+61,100
| +61% | +$438K |
|
|
STR
2721
CALL
DELISTED
Sitio Royalties
STR
| $1.23M | ﹤0.01% |
59,000
+33,800
| +134% | +$766K |
|
2722
Monster Beverage
MNST
$91.4B
| $1.23M | ﹤0.01% |
23,525
-18,844
| -44% | -$934K |
|
2723
PUT
Under Armour Class C
UA
$2.92B
| $1.23M | ﹤0.01% |
138,300
-471,000
| -77% | -$3.38M |
|
2724
PUT
Vulcan Materials
VMC
$36.3B
| $1.23M | ﹤0.01% |
4,900
+300
| +7% | +$74.5K |
|
2725
Avis
CAR
$5.63B
| $1.23M | ﹤0.01% |
14,007
-27,960
| -67% | -$2.52M |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.