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 | |
|---|---|---|---|---|---|---|
6651
Dragonfly Energy
DFLI
$16.5M
| $19K | ﹤0.01% |
138
+98
| +245% | +$17.2K |
|
6652
CALL
Diana Shipping
DSX
$286M
| $19K | ﹤0.01% |
+9,402
| New | +$27.5K |
|
6653
CALL
DTE Energy
DTE
$29.5B
| $19K | ﹤0.01% |
200
-1,600
| -89% | -$172K |
|
|
KYNB
6654
CALL
Kyntra Bio
KYNB
$27.5M
| $19K | ﹤0.01% |
916
-40,224
| -98% | -$1.58M |
|
6655
PUT
Invesco CurrencyShares Australian Dollar Trust
FXA
$97.5M
| $19K | ﹤0.01% |
300
+100
| +50% | +$6.48K |
|
6656
PUT
Galectin Therapeutics
GALT
$213M
| $19K | ﹤0.01% |
9,900
| – | – |
|
|
GLDD
6657
PUT
DELISTED
Great Lakes Dredge & Dock
GLDD
| $19K | ﹤0.01% |
2,400
| – | – |
|
6658
ICL Group
ICL
$6.69B
| $19K | ﹤0.01% |
+3,452
| New | +$20.8K |
|
6659
PUT
Ingredion
INGR
$6.33B
| $19K | ﹤0.01% |
200
+100
| +100% | +$10.4K |
|
6660
PUT
Identive
INVE
$64.8M
| $19K | ﹤0.01% |
2,300
+1,800
| +360% | +$15K |
|
6661
iShares Global Energy ETF
IXC
$2.77B
| $19K | ﹤0.01% |
470
-62
| -12% | -$2.46K |
|
6662
Coca-Cola Femsa
KOF
$22.9B
| $19K | ﹤0.01% |
+244
| New | +$20.2K |
|
6663
CALL
Kite Realty
KRG
$5.88B
| $19K | ﹤0.01% |
900
| – | – |
|
|
LX
6664
PUT
LexinFintech Holdings
LX
$246M
| $19K | ﹤0.01% |
8,600
+6,200
| +258% | +$15K |
|
6665
CALL
MetroCity Bankshares
MCBS
$1B
| $19K | ﹤0.01% |
+1,000
| New | +$19.9K |
|
|
NOA
6666
PUT
North American Construction
NOA
$365M
| $19K | ﹤0.01% |
+900
| New | +$20.3K |
|
6667
CALL
OFS Capital
OFS
$44.1M
| $19K | ﹤0.01% |
1,700
+1,500
| +750% | +$15.9K |
|
6668
PUT
Ouster
OUST
$2.39B
| $19K | ﹤0.01% |
3,900
-4,700
| -55% | -$26K |
|
6669
Pampa Energía
PAM
$4.77B
| $19K | ﹤0.01% |
515
-1,733
| -77% | -$73.9K |
|
6670
CALL
Playboy Inc
PLBY
$133M
| $19K | ﹤0.01% |
24,500
-26,600
| -52% | -$38.2K |
|
6671
CALL
ePlus
PLUS
$2.38B
| $19K | ﹤0.01% |
+300
| New | +$18.5K |
|
6672
ProQR Therapeutics
PRQR
$251M
| $19K | ﹤0.01% |
14,689
+8,159
| +125% | +$12.8K |
|
6673
PUT
RadNet
RDNT
$4.93B
| $19K | ﹤0.01% |
700
-4,900
| -88% | -$153K |
|
6674
PUT
Ring Energy
REI
$315M
| $19K | ﹤0.01% |
9,900
-2,200
| -18% | -$4.41K |
|
6675
ReNew
RNW
$2.25B
| $19K | ﹤0.01% |
+3,510
| New | +$20.7K |
|
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.