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 | |
|---|---|---|---|---|---|---|
3301
ProShares UltraPro Russell2000
URTY
$325M
| $756K | ﹤0.01% |
16,324
+13,715
| +526% | +$471K |
|
3302
PUT
Buckle
BKE
$2.25B
| $755K | ﹤0.01% |
15,900
+3,900
| +33% | +$148K |
|
|
HOLX
3303
DELISTED
Hologic
HOLX
| $750K | ﹤0.01% |
+10,499
| New | +$731K |
|
3304
RenaissanceRe
RNR
$13.7B
| $750K | ﹤0.01% |
3,829
+974
| +34% | +$202K |
|
3305
PUT
Burford Capital
BUR
$911M
| $748K | ﹤0.01% |
48,000
-39,800
| -45% | -$532K |
|
|
SVC
3306
CALL
Service Properties Trust
SVC
$1.09B
| $748K | ﹤0.01% |
17,540
-49,920
| -74% | -$1.89M |
|
|
SWTX
3307
PUT
DELISTED
SpringWorks Therapeutics
SWTX
| $748K | ﹤0.01% |
20,500
+19,800
| +2,829% | +$517K |
|
3308
Jacobs Solutions
J
$15.9B
| $747K | ﹤0.01% |
+6,962
| New | +$758K |
|
|
HRT
3309
DELISTED
HireRight Holdings Corporation
HRT
| $747K | ﹤0.01% |
+55,606
| New | +$629K |
|
3310
PUT
OneWater Marine
ONEW
$221M
| $746K | ﹤0.01% |
22,100
+1,600
| +8% | +$42.3K |
|
3311
PUT
Zai Lab
ZLAB
$2.11B
| $743K | ﹤0.01% |
27,200
+400
| +1% | +$10.6K |
|
3312
PUT
Camtek
CAMT
$6.88B
| $742K | ﹤0.01% |
10,700
-45,600
| -81% | -$2.78M |
|
3313
CALL
Chefs' Warehouse
CHEF
$3.86B
| $741K | ﹤0.01% |
25,200
+21,100
| +515% | +$509K |
|
3314
CALL
BGC Group
BGC
$5.57B
| $740K | ﹤0.01% |
102,600
+76,800
| +298% | +$476K |
|
3315
SkinHealth Systems
SKIN
$99.9M
| $740K | ﹤0.01% |
238,109
+179,150
| +304% | +$672K |
|
3316
CALL
Avient
AVNT
$3.35B
| $739K | ﹤0.01% |
17,800
+14,800
| +493% | +$517K |
|
3317
Boston Beer
SAM
$1.89B
| $739K | ﹤0.01% |
+2,140
| New | +$751K |
|
3318
PUT
American Superconductor
AMSC
$1.43B
| $738K | ﹤0.01% |
66,300
-5,100
| -7% | -$43.1K |
|
3319
Aramark
ARMK
$15.2B
| $737K | ﹤0.01% |
26,252
-64,634
| -71% | -$1.75M |
|
3320
Lumentum
LITE
$54.7B
| $737K | ﹤0.01% |
+14,078
| New | +$614K |
|
|
LSXMA
3321
DELISTED
Liberty Media Corporation Series A Liberty SiriusXM Common Stock
LSXMA
| $737K | ﹤0.01% |
25,669
-15,945
| -38% | -$417K |
|
|
FOLD
3322
CALL
DELISTED
Amicus Therapeutics
FOLD
| $735K | ﹤0.01% |
51,800
-15,500
| -23% | -$176K |
|
3323
CALL
Geron
GERN
$956M
| $735K | ﹤0.01% |
348,600
+165,700
| +91% | +$322K |
|
3324
CALL
Gaotu Techedu
GOTU
$374M
| $735K | ﹤0.01% |
203,300
+131,500
| +183% | +$370K |
|
3325
CALL
Energy Fuels
UUUU
$2.9B
| $733K | ﹤0.01% |
102,000
+67,100
| +192% | +$519K |
|
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.