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 | |
|---|---|---|---|---|---|---|
3351
Ternium
TX
$9.26B
| $715K | ﹤0.01% |
16,836
+5,825
| +53% | +$225K |
|
3352
Equinox Gold
EQX
$7.44B
| $714K | ﹤0.01% |
146,077
+57,763
| +65% | +$274K |
|
3353
CALL
Greif
GEF
$4.53B
| $714K | ﹤0.01% |
10,900
-4,500
| -29% | -$297K |
|
3354
Comstock Resources
CRK
$3.83B
| $713K | ﹤0.01% |
80,669
+52,167
| +183% | +$564K |
|
3355
PUT
Murphy USA
MUSA
$11.3B
| $713K | ﹤0.01% |
2,000
-900
| -31% | -$326K |
|
|
GTHX
3356
DELISTED
G1 Therapeutics, Inc. Common Stock
GTHX
| $712K | ﹤0.01% |
233,626
+216,146
| +1,237% | +$406K |
|
3357
Ameriprise Financial
AMP
$47.4B
| $711K | ﹤0.01% |
+1,874
| New | +$643K |
|
3358
CALL
Green Brick Partners
GRBK
$3.12B
| $711K | ﹤0.01% |
13,700
+9,000
| +191% | +$409K |
|
|
DISH
3359
PUT
DELISTED
DISH Network Corp.
DISH
| $711K | ﹤0.01% |
814,700
-86,300
| -10% | -$387K |
|
3360
Amphenol
APH
$182B
| $706K | ﹤0.01% |
14,264
-1,390
| -9% | -$61.4K |
|
3361
Pinnacle West Capital
PNW
$12.8B
| $706K | ﹤0.01% |
9,828
+7,220
| +277% | +$531K |
|
3362
CALL
MannKind Corp
MNKD
$1.26B
| $702K | ﹤0.01% |
192,900
+36,200
| +23% | +$138K |
|
3363
Joby Aviation
JOBY
$7.08B
| $701K | ﹤0.01% |
+105,513
| New | +$650K |
|
3364
CALL
The RealReal
REAL
$1.38B
| $700K | ﹤0.01% |
348,400
+240,000
| +221% | +$467K |
|
|
TWO
3365
PUT
Two Harbors Investment
TWO
$1.27B
| $700K | ﹤0.01% |
61,400
+5,000
| +9% | +$64.6K |
|
3366
CALL
W.R. Berkley
WRB
$28.1B
| $700K | ﹤0.01% |
14,850
+13,200
| +800% | +$602K |
|
3367
CALL
Bentley Systems
BSY
$10.2B
| $699K | ﹤0.01% |
13,400
-5,900
| -31% | -$303K |
|
|
3368
PUT
Comstock Resources
CRK
$3.83B
| $698K | ﹤0.01% |
78,900
-13,600
| -15% | -$147K |
|
|
VTLE
3369
DELISTED
Vital Energy
VTLE
| $698K | ﹤0.01% |
15,351
-7,953
| -34% | -$381K |
|
3370
Bloom Energy
BE
$52.8B
| $695K | ﹤0.01% |
+46,997
| New | +$588K |
|
|
VRNA
3371
PUT
DELISTED
Verona Pharma
VRNA
| $695K | ﹤0.01% |
35,000
+25,100
| +254% | +$371K |
|
|
KEEL
3372
PUT
Keel Infrastructure Corp
KEEL
$2.42B
| $694K | ﹤0.01% |
238,600
+154,200
| +183% | +$248K |
|
3373
Thomson Reuters
TRI
$42.6B
| $691K | ﹤0.01% |
4,657
-5,591
| -55% | -$755K |
|
3374
CALL
Brookfield Asset Management
BAM
$75.6B
| $690K | ﹤0.01% |
17,200
-5,800
| -25% | -$196K |
|
3375
PUT
Church & Dwight Co
CHD
$23.5B
| $690K | ﹤0.01% |
7,300
+900
| +14% | +$82.4K |
|
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.