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 | |
|---|---|---|---|---|---|---|
3826
PUT
Protagonist Therapeutics
PTGX
$8.8B
| $442K | ﹤0.01% |
19,300
+19,000
| +6,333% | +$332K |
|
|
SA
3827
Seabridge Gold
SA
$2.69B
| $442K | ﹤0.01% |
36,499
-9,093
| -20% | -$105K |
|
3828
CALL
SIGA Technologies
SIGA
$240M
| $442K | ﹤0.01% |
79,100
-12,900
| -14% | -$69.1K |
|
3829
Uranium Energy
UEC
$4.67B
| $442K | ﹤0.01% |
+69,173
| New | +$412K |
|
3830
PUT
Bankunited
BKU
$3.41B
| $441K | ﹤0.01% |
13,600
-54,200
| -80% | -$1.4M |
|
3831
CALL
Employers Holdings
EIG
$912M
| $441K | ﹤0.01% |
+11,200
| New | +$436K |
|
|
NARI
3832
CALL
DELISTED
Inari Medical, Inc. Common Stock
NARI
| $441K | ﹤0.01% |
6,800
+4,100
| +152% | +$247K |
|
3833
CALL
Ares Management
ARES
$28.8B
| $440K | ﹤0.01% |
3,700
-6,000
| -62% | -$651K |
|
3834
CALL
Canadian National Railway
CNI
$78.3B
| $439K | ﹤0.01% |
3,500
-2,400
| -41% | -$272K |
|
3835
PUT
Installed Building Products
IBP
$6.47B
| $438K | ﹤0.01% |
2,400
-14,200
| -86% | -$1.99M |
|
3836
CALL
Dorian LPG
LPG
$1.9B
| $438K | ﹤0.01% |
10,000
+6,500
| +186% | +$242K |
|
3837
PUT
Progyny
PGNY
$2.41B
| $438K | ﹤0.01% |
11,800
-17,800
| -60% | -$598K |
|
3838
CALL
Antero Midstream
AM
$10.3B
| $437K | ﹤0.01% |
34,900
-44,300
| -56% | -$559K |
|
3839
CALL
Nordic American Tanker
NAT
$1.35B
| $436K | ﹤0.01% |
103,900
-284,100
| -73% | -$1.21M |
|
|
PMT
3840
CALL
PennyMac Mortgage Investment
PMT
$854M
| $436K | ﹤0.01% |
29,200
-9,300
| -24% | -$125K |
|
|
CCC
3841
CCC Intelligent Solutions
CCC
$3.59B
| $435K | ﹤0.01% |
38,225
+34,234
| +858% | +$400K |
|
|
LPRO
3842
CALL
Open Lending Corp
LPRO
$373M
| $435K | ﹤0.01% |
51,200
+24,700
| +93% | +$166K |
|
3843
CALL
Microvision
MVIS
$86.6M
| $434K | ﹤0.01% |
163,200
-20,600
| -11% | -$47.3K |
|
3844
CALL
Ryan Specialty Holdings
RYAN
$5.96B
| $434K | ﹤0.01% |
10,100
+3,900
| +63% | +$176K |
|
3845
CALL
CoinShares ETF Trust CoinShares Bitcoin Mining ETF
WGMI
$242M
| $434K | ﹤0.01% |
25,300
+20,400
| +416% | +$236K |
|
|
TE
3846
CALL
T1 Energy
TE
$1.16B
| $434K | ﹤0.01% |
232,500
+109,700
| +89% | +$296K |
|
3847
PUT
Appian
APPN
$2.01B
| $433K | ﹤0.01% |
11,500
+8,000
| +229% | +$313K |
|
3848
Crown Castle
CCI
$33.1B
| $433K | ﹤0.01% |
+3,765
| New | +$386K |
|
3849
PUT
ImmunityBio
IBRX
$7.3B
| $433K | ﹤0.01% |
86,400
-127,200
| -60% | -$399K |
|
3850
LGI Homes
LGIH
$1.43B
| $433K | ﹤0.01% |
3,258
-4,510
| -58% | -$501K |
|
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.