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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2776
PUT
Sprout Social
SPT
$455M
| $1.29M | ﹤0.01% |
21,000
-23,400
| -53% | -$1.23M |
|
2777
Lamar Advertising Co
LAMR
$16.2B
| $1.29M | ﹤0.01% |
12,135
+5,711
| +89% | +$537K |
|
2778
CALL
Liquidia Corp
LQDA
$7.67B
| $1.29M | ﹤0.01% |
106,900
+14,000
| +15% | +$101K |
|
2779
CALL
RPM International
RPM
$13.7B
| $1.28M | ﹤0.01% |
11,500
+3,800
| +49% | +$384K |
|
|
CBAY
2780
PUT
DELISTED
Cymabay Therapeutics
CBAY
| $1.28M | ﹤0.01% |
54,200
-79,700
| -60% | -$1.42M |
|
|
SF
2781
PUT
Stifel
SF
$12.3B
| $1.28M | ﹤0.01% |
27,750
+750
| +3% | +$30.8K |
|
2782
CALL
Advanced Drainage Systems
WMS
$10.9B
| $1.28M | ﹤0.01% |
9,100
+9,000
| +9,000% | +$1.08M |
|
|
AZUL
2783
CALL
DELISTED
Azul
AZUL
| $1.28M | ﹤0.01% |
131,900
-34,000
| -20% | -$309K |
|
2784
Eagle Materials
EXP
$6.6B
| $1.28M | ﹤0.01% |
6,303
+2,173
| +53% | +$382K |
|
2785
CALL
Shoals Technologies Group
SHLS
$1.58B
| $1.27M | ﹤0.01% |
82,100
+48,900
| +147% | +$740K |
|
2786
CALL
ImmunityBio
IBRX
$7.44B
| $1.27M | ﹤0.01% |
253,500
+56,900
| +29% | +$179K |
|
2787
CALL
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$542M
| $1.27M | ﹤0.01% |
33,700
+29,500
| +702% | +$1.02M |
|
2788
CALL
Kimbell Royalty Partners
KRP
$1.47B
| $1.27M | ﹤0.01% |
84,400
+41,600
| +97% | +$652K |
|
2789
PUT
Manhattan Associates
MANH
$8.97B
| $1.27M | ﹤0.01% |
5,900
+3,700
| +168% | +$783K |
|
2790
Direxion Daily Small Cap Bull 3x ETF
TNA
$1.34B
| $1.27M | ﹤0.01% |
32,194
-38,449
| -54% | -$1.12M |
|
|
BORR
2791
PUT
Borr Drilling
BORR
$1.31B
| $1.27M | ﹤0.01% |
172,500
-17,600
| -9% | -$116K |
|
2792
CALL
Shutterstock
SSTK
$205M
| $1.27M | ﹤0.01% |
26,300
+14,500
| +123% | +$612K |
|
|
PXD
2793
DELISTED
Pioneer Natural Resource Co.
PXD
| $1.27M | ﹤0.01% |
+5,640
| New | +$1.32M |
|
2794
CALL
Amneal Pharmaceuticals
AMRX
$5.72B
| $1.26M | ﹤0.01% |
208,500
+199,000
| +2,095% | +$886K |
|
2795
PUT
Genco Shipping & Trading
GNK
$1.17B
| $1.26M | ﹤0.01% |
76,100
+30,800
| +68% | +$448K |
|
2796
Saia
SAIA
$11.3B
| $1.26M | ﹤0.01% |
2,879
+231
| +9% | +$93.3K |
|
2797
Exelixis
EXEL
$13.9B
| $1.26M | ﹤0.01% |
+52,560
| New | +$1.14M |
|
2798
Amplify Junior Silver Miners ETF
SILJ
$3.27B
| $1.26M | ﹤0.01% |
125,886
+60,785
| +93% | +$548K |
|
2799
CALL
Lear
LEA
$7.19B
| $1.26M | ﹤0.01% |
8,900
+5,400
| +154% | +$724K |
|
2800
Masco
MAS
$16B
| $1.26M | ﹤0.01% |
+18,754
| New | +$1.09M |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.