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 | |
|---|---|---|---|---|---|---|
4001
Matador Resources
MTDR
$6.04B
| $280K | ﹤0.01% |
4,708
-13,926
| -75% | -$811K |
|
|
SAFE
4002
Safehold
SAFE
$1.17B
| $280K | ﹤0.01% |
15,773
-9,885
| -39% | -$214K |
|
4003
CALL
abrdn Physical Silver Shares ETF
SIVR
$3.98B
| $280K | ﹤0.01% |
13,200
+5,400
| +69% | +$122K |
|
|
NVEI
4004
CALL
DELISTED
Nuvei Corporation Subordinate Voting Shares
NVEI
| $280K | ﹤0.01% |
18,700
+6,300
| +51% | +$146K |
|
4005
PUT
American Financial Group
AFG
$11.9B
| $279K | ﹤0.01% |
2,500
+2,400
| +2,400% | +$277K |
|
4006
PUT
Genesis Energy
GEL
$1.82B
| $279K | ﹤0.01% |
27,100
+20,800
| +330% | +$205K |
|
4007
CALL
Hudbay
HBM
$9.76B
| $279K | ﹤0.01% |
57,300
-17,000
| -23% | -$86.2K |
|
|
BLRX
4008
CALL
BioLineRX
BLRX
$12M
| $278K | ﹤0.01% |
3,825
+1,922
| +101% | +$129K |
|
|
GRFS
4009
Grifois
GRFS
$5.55B
| $278K | ﹤0.01% |
30,500
+4,451
| +17% | +$43.5K |
|
4010
CALL
Cabaletta Bio
CABA
$427M
| $277K | ﹤0.01% |
18,200
+10,600
| +139% | +$145K |
|
|
MCW
4011
CALL
DELISTED
Mister Car Wash
MCW
| $277K | ﹤0.01% |
50,300
+34,800
| +225% | +$266K |
|
4012
PUT
Patrick Industries
PATK
$2.87B
| $277K | ﹤0.01% |
5,550
-27,450
| -83% | -$1.48M |
|
4013
PUT
Q2 Holdings
QTWO
$3.78B
| $277K | ﹤0.01% |
8,600
+7,300
| +562% | +$242K |
|
4014
PUT
RenaissanceRe
RNR
$13.8B
| $277K | ﹤0.01% |
+1,400
| New | +$269K |
|
|
SILK
4015
CALL
DELISTED
Silk Road Medical, Inc. Common Stock
SILK
| $277K | ﹤0.01% |
18,500
+17,500
| +1,750% | +$364K |
|
4016
Globalstar
GSAT
$10.1B
| $276K | ﹤0.01% |
+14,094
| New | +$253K |
|
4017
PUT
Medifast
MED
$107M
| $276K | ﹤0.01% |
3,700
-1,600
| -30% | -$142K |
|
4018
CALL
Essex Property Trust
ESS
$19.1B
| $275K | ﹤0.01% |
1,300
-300
| -19% | -$70.3K |
|
4019
Healthcare Realty
HR
$7.56B
| $275K | ﹤0.01% |
+18,029
| New | +$320K |
|
4020
CALL
MaxLinear
MXL
$5.19B
| $275K | ﹤0.01% |
12,400
+3,200
| +35% | +$81.3K |
|
4021
CoStar Group
CSGP
$12.2B
| $274K | ﹤0.01% |
+3,568
| New | +$296K |
|
4022
CALL
Mirum Pharmaceuticals
MIRM
$6.56B
| $274K | ﹤0.01% |
8,700
+6,800
| +358% | +$186K |
|
4023
PUT
Prospect Capital
PSEC
$1.08B
| $274K | ﹤0.01% |
45,400
+15,700
| +53% | +$97.9K |
|
4024
PUT
Polestar Automotive Holding UK
PSNY
$1.97B
| $274K | ﹤0.01% |
3,470
-2,623
| -43% | -$291K |
|
4025
Xponential Fitness
XPOF
$286M
| $274K | ﹤0.01% |
17,686
+7,329
| +71% | +$144K |
|
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.