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 | |
|---|---|---|---|---|---|---|
3426
Regal Rexnord
RRX
$14B
| $655K | ﹤0.01% |
+4,430
| New | +$559K |
|
3427
CALL
Global Ship Lease
GSL
$1.55B
| $654K | ﹤0.01% |
33,000
-10,400
| -24% | -$189K |
|
3428
State Street SPDR Portfolio S&P 600 Small Cap ETF
SPSM
$17.1B
| $654K | ﹤0.01% |
+15,514
| New | +$585K |
|
3429
PUT
Joby Aviation
JOBY
$7.25B
| $653K | ﹤0.01% |
98,300
-2,300
| -2% | -$14.2K |
|
|
FIRY
3430
CALL
Firy Inc
FIRY
$130M
| $653K | ﹤0.01% |
104,800
+7,900
| +8% | +$44.2K |
|
|
VTNR
3431
PUT
DELISTED
Vertex Energy, Inc
VTNR
| $651K | ﹤0.01% |
192,100
+146,900
| +325% | +$576K |
|
3432
RCI Hospitality Holdings
RICK
$201M
| $650K | ﹤0.01% |
9,816
+8,432
| +609% | +$492K |
|
3433
CALL
Evercore
EVR
$13.2B
| $649K | ﹤0.01% |
3,800
+100
| +3% | +$14.5K |
|
3434
PUT
SIGA Technologies
SIGA
$222M
| $649K | ﹤0.01% |
116,000
-58,100
| -33% | -$311K |
|
3435
CALL
Denison Mines
DNN
$2.64B
| $646K | ﹤0.01% |
365,500
+80,700
| +28% | +$135K |
|
3436
PUT
Dover
DOV
$27.7B
| $646K | ﹤0.01% |
4,200
-3,100
| -42% | -$434K |
|
3437
PUT
ODDITY Tech
ODD
$758M
| $646K | ﹤0.01% |
13,900
-22,900
| -62% | -$775K |
|
3438
PUT
AST SpaceMobile
ASTS
$17.4B
| $645K | ﹤0.01% |
107,100
-6,600
| -6% | -$28.6K |
|
3439
CALL
American Public Education
APEI
$907M
| $643K | ﹤0.01% |
+66,700
| New | +$424K |
|
|
CWAN
3440
CALL
DELISTED
Clearwater Analytics
CWAN
| $642K | ﹤0.01% |
32,100
+17,500
| +120% | +$345K |
|
3441
Upwork
UPWK
$1.14B
| $642K | ﹤0.01% |
43,178
+40,885
| +1,783% | +$527K |
|
|
DM
3442
PUT
DELISTED
Desktop Metal, Inc.
DM
| $642K | ﹤0.01% |
85,330
-211,740
| -71% | -$1.92M |
|
|
BORR
3443
Borr Drilling
BORR
$1.27B
| $639K | ﹤0.01% |
86,827
+73,190
| +537% | +$482K |
|
3444
PUT
Amplify Energy
AMPY
$155M
| $636K | ﹤0.01% |
107,300
+15,000
| +16% | +$96.8K |
|
3445
CALL
Sphere 3D
ANY
$14.9M
| $636K | ﹤0.01% |
19,180
+4,830
| +34% | +$65.7K |
|
3446
Capital Southwest
CSWC
$1.46B
| $636K | ﹤0.01% |
26,844
+25,502
| +1,900% | +$569K |
|
3447
CALL
Masco
MAS
$16.4B
| $636K | ﹤0.01% |
9,500
-3,000
| -24% | -$174K |
|
3448
MINISO
MNSO
$3.72B
| $636K | ﹤0.01% |
+31,218
| New | +$748K |
|
3449
CALL
Navient
NAVI
$809M
| $636K | ﹤0.01% |
34,200
-1,000
| -3% | -$17.4K |
|
|
SOND
3450
PUT
DELISTED
Sonder
SOND
| $636K | ﹤0.01% |
187,900
+63,500
| +51% | +$367K |
|
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.