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 | |
|---|---|---|---|---|---|---|
3826
iShares Expanded Tech-Software Sector ETF
IGV
$12.3B
| $334K | ﹤0.01% |
4,900
-14,205
| -74% | -$996K |
|
3827
PUT
MillerKnoll
MLKN
$1.61B
| $334K | ﹤0.01% |
13,700
+13,200
| +2,640% | +$247K |
|
3828
Harrow
HROW
$1.47B
| $333K | ﹤0.01% |
+23,210
| New | +$406K |
|
3829
Microvision
MVIS
$86.6M
| $333K | ﹤0.01% |
152,344
+45,928
| +43% | +$140K |
|
3830
Orion Group Holdings
ORN
$485M
| $333K | ﹤0.01% |
+62,267
| New | +$246K |
|
|
TGNA
3831
PUT
DELISTED
TEGNA Inc
TGNA
| $333K | ﹤0.01% |
22,900
+8,800
| +62% | +$143K |
|
|
MTTR
3832
PUT
DELISTED
Matterport, Inc. Class A Common Stock
MTTR
| $333K | ﹤0.01% |
153,600
-76,400
| -33% | -$214K |
|
3833
CALL
ImmunityBio
IBRX
$7.3B
| $332K | ﹤0.01% |
196,600
-22,500
| -10% | -$45.2K |
|
3834
PubMatic
PUBM
$605M
| $332K | ﹤0.01% |
27,441
-25,799
| -48% | -$393K |
|
|
TUZ
3835
PUT
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $332K | ﹤0.01% |
4,600
-5,100
| -53% | -$368K |
|
|
EHAB
3836
CALL
DELISTED
Enhabit
EHAB
| $331K | ﹤0.01% |
+29,500
| New | +$371K |
|
3837
CALL
Element Solutions
ESI
$8.89B
| $331K | ﹤0.01% |
16,900
+1,500
| +10% | +$29.8K |
|
3838
CALL
Murphy Oil
MUR
$5.25B
| $331K | ﹤0.01% |
7,300
-70,100
| -91% | -$3.05M |
|
3839
CALL
Snap-on
SNA
$21.7B
| $331K | ﹤0.01% |
1,300
-300
| -19% | -$81.1K |
|
|
ARI
3840
PUT
Apollo Commercial Real Estate
ARI
$881M
| $330K | ﹤0.01% |
32,600
+4,800
| +17% | +$52.3K |
|
3841
Hudbay
HBM
$9.67B
| $329K | ﹤0.01% |
67,679
+34,627
| +105% | +$176K |
|
|
VRN
3842
PUT
DELISTED
Veren
VRN
| $328K | ﹤0.01% |
39,600
-30,800
| -44% | -$246K |
|
|
ACRE
3843
PUT
Ares Commercial Real Estate
ACRE
$256M
| $327K | ﹤0.01% |
34,400
+24,500
| +247% | +$252K |
|
3844
CALL
Marten Transport
MRTN
$1.25B
| $327K | ﹤0.01% |
+16,600
| New | +$351K |
|
3845
Murphy USA
MUSA
$11.1B
| $327K | ﹤0.01% |
959
+910
| +1,857% | +$289K |
|
3846
Owens Corning
OC
$11.5B
| $327K | ﹤0.01% |
+2,403
| New | +$330K |
|
3847
TransUnion
TRU
$16.2B
| $327K | ﹤0.01% |
+4,566
| New | +$358K |
|
3848
PUT
Energizer
ENR
$1.5B
| $326K | ﹤0.01% |
10,200
+6,700
| +191% | +$230K |
|
3849
AST SpaceMobile
ASTS
$16.9B
| $325K | ﹤0.01% |
+85,741
| New | +$346K |
|
3850
PUT
Designer Brands
DBI
$322M
| $325K | ﹤0.01% |
25,700
-10,100
| -28% | -$108K |
|
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.