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 | |
|---|---|---|---|---|---|---|
4951
GoodRx Holdings
GDRX
$1.07B
| $114K | ﹤0.01% |
20,414
-8,826
| -30% | -$58.8K |
|
|
GOOS
4952
Canada Goose Holdings
GOOS
$904M
| $114K | ﹤0.01% |
7,802
-11,200
| -59% | -$183K |
|
4953
CALL
InvenTrust Properties
IVT
$2.74B
| $114K | ﹤0.01% |
4,800
-800
| -14% | -$19.2K |
|
4954
Madison Square Garden
MSGE
$3.73B
| $114K | ﹤0.01% |
3,467
-1,027
| -23% | -$33.9K |
|
4955
CALL
Prosperity Bancshares
PB
$8.97B
| $114K | ﹤0.01% |
2,100
+500
| +31% | +$29K |
|
4956
CALL
Phillips Edison & Co
PECO
$5.45B
| $114K | ﹤0.01% |
3,400
-29,600
| -90% | -$1.02M |
|
4957
RBB Bancorp
RBB
$446M
| $114K | ﹤0.01% |
8,935
+101
| +1% | +$1.37K |
|
4958
Relmada Therapeutics
RLMD
$562M
| $114K | ﹤0.01% |
38,321
-6,042
| -14% | -$17.9K |
|
4959
PUT
Red Robin
RRGB
$144M
| $114K | ﹤0.01% |
14,200
-34,400
| -71% | -$410K |
|
4960
Stellus Capital Investment Corp
SCM
$216M
| $114K | ﹤0.01% |
+8,415
| New | +$121K |
|
|
SUPV
4961
PUT
Grupo Supervielle
SUPV
$880M
| $114K | ﹤0.01% |
51,700
+6,500
| +14% | +$18.6K |
|
4962
Arteris
AIP
$1.35B
| $113K | ﹤0.01% |
17,365
-11,518
| -40% | -$79.2K |
|
4963
Digital Turbine
APPS
$990M
| $113K | ﹤0.01% |
18,805
+1,581
| +9% | +$14.1K |
|
4964
Cogent Communications
CCOI
$663M
| $113K | ﹤0.01% |
1,837
+1,445
| +369% | +$94.5K |
|
4965
CALL
LifeVantage
LFVN
$79.4M
| $113K | ﹤0.01% |
17,600
+17,000
| +2,833% | +$95.1K |
|
|
MAG
4966
PUT
DELISTED
MAG Silver
MAG
| $113K | ﹤0.01% |
10,900
-14,600
| -57% | -$162K |
|
4967
CALL
Rigel Pharmaceuticals
RIGL
$704M
| $113K | ﹤0.01% |
10,470
-2,390
| -19% | -$28.8K |
|
4968
PUT
Veracyte
VCYT
$4.77B
| $113K | ﹤0.01% |
5,100
+3,500
| +219% | +$90K |
|
|
VRTV
4969
DELISTED
VERITIV CORPORATION
VRTV
| $113K | ﹤0.01% |
673
+652
| +3,105% | +$101K |
|
|
AIV
4970
CALL
Aimco
AIV
$383M
| $112K | ﹤0.01% |
16,500
+12,300
| +293% | +$97.9K |
|
4971
PUT
Arrow Electronics
ARW
$10.9B
| $112K | ﹤0.01% |
900
+800
| +800% | +$107K |
|
4972
PUT
Astronics
ATRO
$3.38B
| $112K | ﹤0.01% |
+8,520
| New | +$128K |
|
|
DSL
4973
CALL
DoubleLine Income Solutions Fund
DSL
$1.23B
| $112K | ﹤0.01% |
9,600
+9,100
| +1,820% | +$109K |
|
4974
CALL
8x8 Inc
EGHT
$262M
| $112K | ﹤0.01% |
44,800
-2,000
| -4% | -$7.11K |
|
4975
Fulcrum Therapeutics
FULC
$248M
| $112K | ﹤0.01% |
25,424
+24,976
| +5,575% | +$109K |
|
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.