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 | |
|---|---|---|---|---|---|---|
4476
CALL
Hess Midstream
HESM
$5.19B
| $177K | ﹤0.01% |
6,100
-26,400
| -81% | -$796K |
|
4477
CALL
Intapp
INTA
$2.44B
| $177K | ﹤0.01% |
5,300
+100
| +2% | +$3.65K |
|
|
LAND
4478
PUT
Gladstone Land Corp
LAND
$365M
| $177K | ﹤0.01% |
12,500
+1,700
| +16% | +$27.1K |
|
4479
PUT
NOV
NOV
$6.84B
| $177K | ﹤0.01% |
8,500
-54,700
| -87% | -$1.09M |
|
4480
CALL
Rexford Industrial Realty
REXR
$8.63B
| $177K | ﹤0.01% |
3,600
+2,000
| +125% | +$106K |
|
|
4481
PUT
Rexford Industrial Realty
REXR
$8.63B
| $177K | ﹤0.01% |
3,600
+1,100
| +44% | +$58.2K |
|
4482
CALL
XPEL
XPEL
$1.22B
| $177K | ﹤0.01% |
2,300
+1,500
| +188% | +$121K |
|
|
GOL
4483
DELISTED
Gol Linhas Aéreas Inteligentes S.A. American Depositary Shares (Each representing Ten Preferred Shares)
GOL
| $177K | ﹤0.01% |
64,963
-28,002
| -30% | -$98.9K |
|
4484
CALL
Biohaven
BHVN
$2.02B
| $176K | ﹤0.01% |
6,800
+5,200
| +325% | +$108K |
|
|
BLD
4485
PUT
DELISTED
TopBuild
BLD
| $176K | ﹤0.01% |
700
+300
| +75% | +$82.6K |
|
|
BPT
4486
PUT
DELISTED
BP Prudhoe Bay Royalty Trust
BPT
| $176K | ﹤0.01% |
24,700
-39,000
| -61% | -$248K |
|
|
ETWO
4487
PUT
DELISTED
E2open Parent Holdings
ETWO
| $176K | ﹤0.01% |
38,800
| – | – |
|
4488
PUT
NexGen Energy
NXE
$5.91B
| $176K | ﹤0.01% |
29,600
+26,300
| +797% | +$136K |
|
4489
CALL
Vital Farms
VITL
$586M
| $176K | ﹤0.01% |
15,200
+7,000
| +85% | +$80.6K |
|
|
NARI
4490
CALL
DELISTED
Inari Medical, Inc. Common Stock
NARI
| $176K | ﹤0.01% |
2,700
-4,700
| -64% | -$296K |
|
|
ARCE
4491
CALL
DELISTED
Arco Platform Limited Class A Common Shares
ARCE
| $176K | ﹤0.01% |
12,800
-17,200
| -57% | -$227K |
|
4492
FuboTV Inc
FUBO
$260M
| $175K | ﹤0.01% |
5,477
-12,095
| -69% | -$374K |
|
4493
CALL
Quad
QUAD
$479M
| $175K | ﹤0.01% |
34,800
-3,600
| -9% | -$18.9K |
|
4494
Sterling Infrastructure
STRL
$15.2B
| $175K | ﹤0.01% |
2,386
+1,072
| +82% | +$75K |
|
4495
PUT
Transmedics
TMDX
$2.7B
| $175K | ﹤0.01% |
3,200
+2,600
| +433% | +$187K |
|
|
ZUO
4496
CALL
DELISTED
Zuora, Inc.
ZUO
| $175K | ﹤0.01% |
21,300
+12,700
| +148% | +$125K |
|
4497
PUT
Flowserve
FLS
$8.94B
| $174K | ﹤0.01% |
4,400
-17,000
| -79% | -$656K |
|
4498
CALL
Hayward Holdings
HAYW
$3.31B
| $174K | ﹤0.01% |
12,400
+7,800
| +170% | +$107K |
|
4499
CALL
PetMed Express
PETS
$42.3M
| $174K | ﹤0.01% |
17,000
-2,300
| -12% | -$28.4K |
|
4500
CALL
Qiagen
QGEN
$8.62B
| $174K | ﹤0.01% |
4,055
-1,226
| -23% | -$57.2K |
|
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.