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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
MOMO
4051
PUT
Hello Group
MOMO
$870M
| $267K | ﹤0.01% |
38,300
-4,700
| -11% | -$43.2K |
|
4052
PUT
Omeros
OMER
$831M
| $267K | ﹤0.01% |
91,500
+77,500
| +554% | +$311K |
|
4053
PUT
Onto Innovation
ONTO
$10.7B
| $267K | ﹤0.01% |
+2,100
| New | +$250K |
|
|
ENFN
4054
CALL
DELISTED
Enfusion, Inc.
ENFN
| $267K | ﹤0.01% |
29,800
+8,200
| +38% | +$77.9K |
|
4055
PUT
Cadre Holdings
CDRE
$1.33B
| $266K | ﹤0.01% |
10,000
-500
| -5% | -$12.2K |
|
4056
PUT
Principal Financial Group
PFG
$24.5B
| $266K | ﹤0.01% |
3,700
-5,900
| -61% | -$458K |
|
4057
Vanguard FTSE Europe ETF
VGK
$30B
| $266K | ﹤0.01% |
+4,601
| New | +$280K |
|
4058
PUT
CoreCivic
CXW
$2.99B
| $265K | ﹤0.01% |
23,600
-40,700
| -63% | -$409K |
|
4059
PUT
Geron
GERN
$911M
| $265K | ﹤0.01% |
125,300
-33,800
| -21% | -$91.7K |
|
4060
Hertz
HTZ
$505M
| $265K | ﹤0.01% |
+21,633
| New | +$362K |
|
4061
PUT
MarineMax
HZO
$752M
| $265K | ﹤0.01% |
8,100
-66,800
| -89% | -$2.32M |
|
|
DNMR
4062
CALL
DELISTED
Danimer Scientific, Inc.
DNMR
| $265K | ﹤0.01% |
3,213
+2,603
| +427% | +$236K |
|
4063
CALL
Amkor Technology
AMKR
$11B
| $264K | ﹤0.01% |
11,700
-3,600
| -24% | -$94.9K |
|
4064
CorMedix
CRMD
$561M
| $264K | ﹤0.01% |
71,463
-6,233
| -8% | -$24.8K |
|
4065
CALL
CryoPort
CYRX
$745M
| $264K | ﹤0.01% |
19,300
+16,600
| +615% | +$244K |
|
|
OBE
4066
PUT
Obsidian Energy
OBE
$652M
| $264K | ﹤0.01% |
32,200
+12,600
| +64% | +$88.2K |
|
4067
PUT
Old Republic International
ORI
$10.8B
| $264K | ﹤0.01% |
9,800
+5,300
| +118% | +$143K |
|
4068
PUT
Quanterix
QTRX
$160M
| $263K | ﹤0.01% |
9,700
+8,600
| +782% | +$213K |
|
4069
PUT
Tiptree Inc
TIPT
$694M
| $263K | ﹤0.01% |
+15,700
| New | +$249K |
|
4070
PUT
Viasat
VSAT
$9.74B
| $263K | ﹤0.01% |
14,300
+14,200
| +14,200% | +$406K |
|
4071
CALL
Coca-Cola Europacific Partners
CCEP
$48.9B
| $262K | ﹤0.01% |
4,200
+4,100
| +4,100% | +$261K |
|
4072
CALL
Jack in the Box
JACK
$315M
| $262K | ﹤0.01% |
3,800
-2,900
| -43% | -$247K |
|
4073
PUT
Kosmos Energy
KOS
$1.45B
| $262K | ﹤0.01% |
32,100
-17,900
| -36% | -$127K |
|
4074
CALL
Pagaya Technologies
PGY
$1.36B
| $262K | ﹤0.01% |
13,850
+12,233
| +757% | +$297K |
|
4075
CALL
Red Rock Resorts
RRR
$3.84B
| $262K | ﹤0.01% |
6,400
-3,800
| -37% | -$172K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.