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 | |
|---|---|---|---|---|---|---|
7426
PUT
Neogen
NEOG
$2.03B
| $7K | ﹤0.01% |
400
-9,800
| -96% | -$213K |
|
7427
PUT
Nexa Resources
NEXA
$1.71B
| $7K | ﹤0.01% |
1,300
-6,700
| -84% | -$36.7K |
|
7428
CALL
NextNav
NN
$1.73B
| $7K | ﹤0.01% |
+1,400
| New | +$5.64K |
|
7429
PUT
Global X MSCI Norway ETF
NORW
$85M
| $7K | ﹤0.01% |
500
-800
| -62% | -$19.4K |
|
7430
CALL
NRX Pharmaceuticals
NRXP
$155M
| $7K | ﹤0.01% |
2,780
-90
| -3% | -$299 |
|
7431
PUT
Enviri
NVRI
$620M
| $7K | ﹤0.01% |
1,000
| – | – |
|
7432
PUT
Northwest Natural Holdings
NWN
$2.16B
| $7K | ﹤0.01% |
+200
| New | +$8.22K |
|
7433
ProShares K-1 Free Crude Oil Strategy ETF
OILK
$205M
| $7K | ﹤0.01% |
145
-453
| -76% | -$21K |
|
7434
CALL
Old National Bancorp
ONB
$10.1B
| $7K | ﹤0.01% |
500
-1,300
| -72% | -$20.1K |
|
7435
PUT
Oramed Pharmaceuticals
ORMP
$170M
| $7K | ﹤0.01% |
2,800
-300
| -10% | -$945 |
|
7436
CALL
Orion Group Holdings
ORN
$503M
| $7K | ﹤0.01% |
+1,400
| New | +$5.54K |
|
7437
PUT
Provident Financial Services
PFS
$3.11B
| $7K | ﹤0.01% |
500
+200
| +67% | +$3.39K |
|
7438
PUT
PJT Partners
PJT
$4.36B
| $7K | ﹤0.01% |
+100
| New | +$7.73K |
|
7439
Parke Bancorp
PKBK
$392M
| $7K | ﹤0.01% |
480
+380
| +380% | +$6.66K |
|
7440
PUT
Playtika
PLTK
$1.48B
| $7K | ﹤0.01% |
800
-58,500
| -99% | -$626K |
|
7441
Protalix BioTherapeutics
PLX
$193M
| $7K | ﹤0.01% |
4,813
-61,566
| -93% | -$111K |
|
|
PSTL
7442
Postal Realty Trust
PSTL
$722M
| $7K | ﹤0.01% |
+589
| New | +$8.54K |
|
7443
CALL
Pixelworks
PXLW
$37.9M
| $7K | ﹤0.01% |
525
-217
| -29% | -$3.74K |
|
7444
PUT
Quad
QUAD
$438M
| $7K | ﹤0.01% |
1,400
+200
| +17% | +$1.05K |
|
7445
PUT
QuickLogic
QUIK
$228M
| $7K | ﹤0.01% |
900
-1,800
| -67% | -$15.1K |
|
7446
CALL
Rentokil
RTO
$14.4B
| $7K | ﹤0.01% |
200
| – | – |
|
|
7447
Rentokil
RTO
$14.4B
| $7K | ﹤0.01% |
205
+108
| +111% | +$4.13K |
|
|
7448
PUT
Rentokil
RTO
$14.4B
| $7K | ﹤0.01% |
+200
| New | +$7.64K |
|
7449
Retractable Technologies
RVP
$20.1M
| $7K | ﹤0.01% |
6,495
+1,707
| +36% | +$2.01K |
|
7450
PUT
SITE Centers
SITC
$232M
| $7K | ﹤0.01% |
769
-897
| -54% | -$9.45K |
|
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.