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 | |
|---|---|---|---|---|---|---|
4326
PUT
Acuity Brands
AYI
$9.99B
| $204K | ﹤0.01% |
1,200
-6,300
| -84% | -$1.03M |
|
4327
PUT
Cogent Communications
CCOI
$635M
| $204K | ﹤0.01% |
3,300
-300
| -8% | -$19.6K |
|
4328
PUT
ProShares UltraShort Industrials
SIJ
$6.11M
| $204K | ﹤0.01% |
1,950
-400
| -17% | -$20.9K |
|
4329
PUT
Petco
WOOF
$797M
| $204K | ﹤0.01% |
50,000
+21,200
| +74% | +$139K |
|
|
GAP
4330
The Gap Inc
GAP
$7.3B
| $204K | ﹤0.01% |
19,217
-81,523
| -81% | -$832K |
|
4331
CALL
Bain Capital Specialty
BCSF
$821M
| $203K | ﹤0.01% |
13,300
-30,400
| -70% | -$460K |
|
|
CIM
4332
CALL
Chimera Investment
CIM
$1.06B
| $203K | ﹤0.01% |
12,433
-15,534
| -56% | -$273K |
|
4333
CALL
Cimpress
CMPR
$2.37B
| $203K | ﹤0.01% |
+2,900
| New | +$192K |
|
|
CPRX
4334
CALL
DELISTED
Catalyst Pharmaceutical
CPRX
| $203K | ﹤0.01% |
17,400
-16,800
| -49% | -$225K |
|
4335
CALL
Sturm, Ruger & Co
RGR
$603M
| $203K | ﹤0.01% |
3,900
-37,800
| -91% | -$1.99M |
|
4336
BRC Group Holdings
RILY
$264M
| $203K | ﹤0.01% |
+4,962
| New | +$244K |
|
|
ACRE
4337
Ares Commercial Real Estate
ACRE
$247M
| $202K | ﹤0.01% |
+21,244
| New | +$219K |
|
4338
CALL
APi Group
APG
$16.7B
| $202K | ﹤0.01% |
11,700
+11,250
| +2,500% | +$206K |
|
4339
Genius Sports
GENI
$1.95B
| $202K | ﹤0.01% |
38,035
+25,881
| +213% | +$171K |
|
4340
Sportradar
SRAD
$4.42B
| $202K | ﹤0.01% |
20,213
+8,494
| +72% | +$106K |
|
4341
Tiptree Inc
TIPT
$694M
| $202K | ﹤0.01% |
+12,108
| New | +$192K |
|
|
DO
4342
PUT
DELISTED
Diamond Offshore Drilling, Inc.
DO
| $202K | ﹤0.01% |
13,800
-8,200
| -37% | -$125K |
|
4343
Aclaris Therapeutics
ACRS
$715M
| $201K | ﹤0.01% |
29,424
+27,081
| +1,156% | +$231K |
|
4344
Jones Lang LaSalle
JLL
$15.8B
| $201K | ﹤0.01% |
1,426
+611
| +75% | +$99.8K |
|
4345
PUT
Marten Transport
MRTN
$1.22B
| $201K | ﹤0.01% |
+10,200
| New | +$216K |
|
|
RVPH
4346
DELISTED
REVIVA PHARMA HLDGS INC
RVPH
| $201K | ﹤0.01% |
2,060
+537
| +35% | +$50.1K |
|
4347
ProShares VIX Short-Term Futures ETF
VIXY
$221M
| $201K | ﹤0.01% |
2,164
+1,221
| +129% | +$115K |
|
|
VNET
4348
PUT
VNET Group
VNET
$1.79B
| $201K | ﹤0.01% |
64,300
+11,200
| +21% | +$33.7K |
|
|
WCN
4349
PUT
Waste Connections
WCN
$43.6B
| $201K | ﹤0.01% |
1,500
+100
| +7% | +$14K |
|
|
VTNR
4350
PUT
DELISTED
Vertex Energy, Inc
VTNR
| $201K | ﹤0.01% |
45,200
-112,000
| -71% | -$575K |
|
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.