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 | |
|---|---|---|---|---|---|---|
6251
Merit Medical Systems
MMSI
$4.82B
| $42K | ﹤0.01% |
560
+93
| +20% | +$6.49K |
|
6252
CALL
NatWest
NWG
$69.9B
| $42K | ﹤0.01% |
7,500
+4,400
| +142% | +$23.4K |
|
|
ONL
6253
Orion Office REIT
ONL
$151M
| $42K | ﹤0.01% |
7,471
+7,390
| +9,123% | +$38.5K |
|
|
PINC
6254
PUT
DELISTED
Premier
PINC
| $42K | ﹤0.01% |
1,900
-200
| -10% | -$4.13K |
|
6255
CALL
Playboy Inc
PLBY
$136M
| $42K | ﹤0.01% |
42,400
+17,900
| +73% | +$11.8K |
|
6256
PUT
Perdoceo Education
PRDO
$2.17B
| $42K | ﹤0.01% |
+2,400
| New | +$42.3K |
|
|
RGLS
6257
CALL
DELISTED
Regulus Therapeutics
RGLS
| $42K | ﹤0.01% |
55,200
-5,000
| -8% | -$6.66K |
|
|
SLRN
6258
PUT
DELISTED
ACELYRIN
SLRN
| $42K | ﹤0.01% |
5,700
+100
| +2% | +$853 |
|
6259
CALL
Ternium
TX
$9.43B
| $42K | ﹤0.01% |
1,000
-12,600
| -93% | -$487K |
|
6260
CALL
Vericel Corp
VCEL
$2.38B
| $42K | ﹤0.01% |
1,200
-1,500
| -56% | -$52.2K |
|
6261
CALL
Abeona Therapeutics
ABEO
$355M
| $41K | ﹤0.01% |
+8,300
| New | +$36.5K |
|
|
AHT
6262
CALL
Ashford Hospitality Trust
AHT
$20.8M
| $41K | ﹤0.01% |
2,140
+10
| +0.5% | +$220 |
|
6263
Alamo Group
ALG
$1.91B
| $41K | ﹤0.01% |
+197
| New | +$36K |
|
6264
CALL
Archrock
AROC
$6.16B
| $41K | ﹤0.01% |
2,700
-3,200
| -54% | -$44.5K |
|
6265
Atea Pharmaceuticals
AVIR
$370M
| $41K | ﹤0.01% |
13,458
+11,264
| +513% | +$34.1K |
|
6266
Breakwave Dry Bulk Shipping ETF
BDRY
$28.1M
| $41K | ﹤0.01% |
3,556
-25,965
| -88% | -$186K |
|
6267
CALL
Brixmor Property Group
BRX
$9.72B
| $41K | ﹤0.01% |
1,800
-1,900
| -51% | -$40.9K |
|
6268
PUT
Cabot Corp
CBT
$4.72B
| $41K | ﹤0.01% |
500
| – | – |
|
6269
PUT
Distribution Solutions Group
DSGR
$1.6B
| $41K | ﹤0.01% |
+1,300
| New | +$36.6K |
|
6270
Fortune Brands Innovations
FBIN
$5.86B
| $41K | ﹤0.01% |
+546
| New | +$35.9K |
|
6271
PUT
FuelCell Energy
FCEL
$1.45B
| $41K | ﹤0.01% |
857
-996
| -54% | -$38.1K |
|
6272
PUT
Fortrea Holdings
FTRE
$1.93B
| $41K | ﹤0.01% |
1,200
+800
| +200% | +$24.5K |
|
|
CBIO
6273
CALL
Crescent Biopharma
CBIO
$546M
| $41K | ﹤0.01% |
177
-35
| -17% | -$5.44K |
|
6274
CALL
HCI Group
HCI
$2.34B
| $41K | ﹤0.01% |
1,800
-4,700
| -72% | -$344K |
|
|
KREF
6275
CALL
KKR Real Estate Finance Trust
KREF
$466M
| $41K | ﹤0.01% |
3,100
-2,900
| -48% | -$34.8K |
|
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.