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 | |
|---|---|---|---|---|---|---|
5876
PUT
Endava
DAVA
$153M
| $62K | ﹤0.01% |
800
-12,700
| -94% | -$786K |
|
5877
CALL
Dragonfly Energy
DFLI
$16.5M
| $62K | ﹤0.01% |
1,279
-1,011
| -44% | -$76.7K |
|
5878
Flux Power
FLUX
$11.5M
| $62K | ﹤0.01% |
15,223
+5,703
| +60% | +$19.8K |
|
5879
Hyster-Yale Materials Handling
HY
$600M
| $62K | ﹤0.01% |
+1,006
| New | +$47.9K |
|
5880
Qfin Holdings
QFIN
$1.69B
| $62K | ﹤0.01% |
3,962
+843
| +27% | +$12.9K |
|
5881
CALL
Sabra Healthcare REIT
SBRA
$5.38B
| $62K | ﹤0.01% |
4,400
-1,000
| -19% | -$14.2K |
|
5882
Transact Technologies
TACT
$50.1M
| $62K | ﹤0.01% |
8,943
+2,579
| +41% | +$16.9K |
|
5883
Viridian Therapeutics
VRDN
$2.2B
| $62K | ﹤0.01% |
2,856
+1,128
| +65% | +$17.8K |
|
5884
CALL
Warby Parker
WRBY
$3.19B
| $62K | ﹤0.01% |
4,400
+1,000
| +29% | +$12.5K |
|
|
CONN
5885
PUT
DELISTED
Conn's Inc.
CONN
| $62K | ﹤0.01% |
+14,100
| New | +$46.5K |
|
5886
PUT
Abeona Therapeutics
ABEO
$369M
| $61K | ﹤0.01% |
+12,300
| New | +$54.1K |
|
5887
Acacia Research
ACTG
$426M
| $61K | ﹤0.01% |
+15,708
| New | +$58.1K |
|
5888
Adecoagro
AGRO
$1.47B
| $61K | ﹤0.01% |
5,524
+3,605
| +188% | +$39.7K |
|
5889
CALL
Banco Bilbao Vizcaya Argentaria
BBVA
$152B
| $61K | ﹤0.01% |
6,700
-1,700
| -20% | -$14.6K |
|
|
BRT
5890
CALL
BRT Apartments
BRT
$284M
| $61K | ﹤0.01% |
3,300
+1,600
| +94% | +$28.3K |
|
|
BRSP
5891
CALL
BrightSpire Capital
BRSP
$633M
| $61K | ﹤0.01% |
8,300
-1,300
| -14% | -$8.48K |
|
5892
PUT
Invesco DB Commodity Index Tracking Fund
DBC
$1.69B
| $61K | ﹤0.01% |
2,800
-2,700
| -49% | -$64.5K |
|
5893
CALL
Delcath Systems
DCTH
$416M
| $61K | ﹤0.01% |
14,900
+400
| +3% | +$1.31K |
|
5894
CALL
Getty Images
GETY
$158M
| $61K | ﹤0.01% |
11,800
+4,200
| +55% | +$21.1K |
|
5895
PUT
Gerdau
GGB
$9.74B
| $61K | ﹤0.01% |
57,360
-5,280
| -8% | -$20.2K |
|
5896
PUT
Goldman Sachs BDC
GSBD
$975M
| $61K | ﹤0.01% |
4,200
-100
| -2% | -$1.45K |
|
5897
CALL
Marcus Corp
MCS
$912M
| $61K | ﹤0.01% |
4,200
+3,800
| +950% | +$56.9K |
|
|
ONT
5898
PUT
Onterris Inc
ONT
$731M
| $61K | ﹤0.01% |
1,900
+1,800
| +1,800% | +$51.7K |
|
5899
PUT
Methode Electronics
MEI
$486M
| $61K | ﹤0.01% |
2,700
-1,100
| -29% | -$25.8K |
|
|
DFTX
5900
PUT
Definium Therapeutics
DFTX
$5.91B
| $61K | ﹤0.01% |
19,100
+6,600
| +53% | +$19.9K |
|
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.