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 | |
|---|---|---|---|---|---|---|
1101
CALL
Seagate
STX
$207B
| $9.79M | 0.01% |
114,700
-159,400
| -58% | -$11.9M |
|
1102
CALL
Alnylam Pharmaceuticals
ALNY
$35.9B
| $9.7M | 0.01% |
50,700
+27,600
| +119% | +$4.7M |
|
1103
CALL
Entegris
ENTG
$20.6B
| $9.69M | 0.01% |
80,900
+42,700
| +112% | +$4.33M |
|
1104
CALL
Alamos Gold
AGI
$12.3B
| $9.69M | 0.01% |
719,500
+165,700
| +30% | +$2.17M |
|
1105
CALL
Keurig Dr Pepper
KDP
$40.4B
| $9.68M | 0.01% |
290,400
+187,300
| +182% | +$5.84M |
|
|
P
1106
PUT
Everpure Inc
P
$25B
| $9.67M | 0.01% |
271,200
-151,100
| -36% | -$5.3M |
|
1107
PUT
T. Rowe Price
TROW
$24.6B
| $9.67M | 0.01% |
89,800
-100,000
| -53% | -$9.96M |
|
1108
CALL
Toast
TOST
$16.5B
| $9.62M | 0.01% |
526,600
+156,600
| +42% | +$2.57M |
|
1109
PUT
Allegro MicroSystems
ALGM
$9.33B
| $9.59M | 0.01% |
316,800
-29,700
| -9% | -$848K |
|
1110
CALL
Steel Dynamics
STLD
$34.7B
| $9.59M | 0.01% |
81,200
+6,900
| +9% | +$769K |
|
1111
PUT
Western Alliance Bancorporation
WAL
$9.06B
| $9.59M | 0.01% |
145,700
-173,800
| -54% | -$8.77M |
|
|
CNR
1112
PUT
Core Natural Resources Inc
CNR
$4.36B
| $9.58M | 0.01% |
95,300
+21,600
| +29% | +$2.2M |
|
1113
PUT
NRG Energy
NRG
$30.2B
| $9.57M | 0.01% |
185,200
-7,100
| -4% | -$321K |
|
1114
PUT
Whirlpool
WHR
$2.31B
| $9.57M | 0.01% |
78,600
-15,400
| -16% | -$1.79M |
|
|
BERY
1115
CALL
DELISTED
Berry Global Group, Inc.
BERY
| $9.55M | 0.01% |
154,420
+135,471
| +715% | +$7.64M |
|
1116
PUT
KKR & Co
KKR
$86.2B
| $9.54M | 0.01% |
115,200
+72,900
| +172% | +$4.94M |
|
1117
CALL
TripAdvisor
TRIP
$1.57B
| $9.5M | 0.01% |
441,100
+291,300
| +194% | +$5.11M |
|
1118
Apollo Global Management
APO
$68.6B
| $9.49M | 0.01% |
+101,840
| New | +$8.99M |
|
1119
CALL
Gold Fields
GFI
$28.9B
| $9.49M | 0.01% |
656,200
+77,000
| +13% | +$1.07M |
|
1120
PUT
MasTec
MTZ
$28.4B
| $9.48M | 0.01% |
125,200
+49,200
| +65% | +$3.08M |
|
1121
PUT
Prologis
PLD
$135B
| $9.48M | 0.01% |
71,100
+42,200
| +146% | +$4.79M |
|
1122
PUT
ArcelorMittal
MT
$49.9B
| $9.47M | 0.01% |
333,600
-29,100
| -8% | -$712K |
|
1123
CALL
Equifax
EFX
$19.6B
| $9.45M | 0.01% |
38,200
+7,100
| +23% | +$1.44M |
|
1124
CALL
British American Tobacco
BTI
$129B
| $9.44M | 0.01% |
322,200
+133,700
| +71% | +$4.07M |
|
1125
CALL
Molson Coors Class B
TAP
$7.51B
| $9.43M | 0.01% |
154,100
-48,300
| -24% | -$2.9M |
|
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.