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 | |
|---|---|---|---|---|---|---|
4826
BlueLinx
BXC
$430M
| $129K | ﹤0.01% |
+1,580
| New | +$139K |
|
4827
CALL
IAMGOLD
IAG
$8.05B
| $129K | ﹤0.01% |
60,200
+9,500
| +19% | +$23.4K |
|
4828
CALL
Leslie's
LESL
$8.33M
| $129K | ﹤0.01% |
1,140
+530
| +87% | +$69.4K |
|
4829
CALL
PDS Biotechnology
PDSB
$37.4M
| $129K | ﹤0.01% |
25,700
+15,000
| +140% | +$82.2K |
|
4830
Zumiez
ZUMZ
$330M
| $129K | ﹤0.01% |
+7,278
| New | +$131K |
|
4831
CALL
AMC Global Media
AMCX
$450M
| $128K | ﹤0.01% |
10,900
+5,000
| +85% | +$60.6K |
|
|
FPI
4832
PUT
Farmland Partners
FPI
$415M
| $128K | ﹤0.01% |
12,500
-3,700
| -23% | -$42.2K |
|
4833
iShares Core S&P Small-Cap ETF
IJR
$109B
| $128K | ﹤0.01% |
1,366
-3,389
| -71% | -$339K |
|
4834
PUT
Envista
NVST
$4.62B
| $128K | ﹤0.01% |
4,600
+1,500
| +48% | +$48.6K |
|
4835
PUT
Phinia Inc
PHIN
$3.04B
| $128K | ﹤0.01% |
+4,800
| New | +$133K |
|
4836
PUT
PRA Group
PRAA
$672M
| $128K | ﹤0.01% |
6,700
+500
| +8% | +$10.5K |
|
4837
PUT
Pacer Trendpilot US Large Cap ETF
PTLC
$3.19B
| $128K | ﹤0.01% |
2,600
+1,900
| +271% | +$78.7K |
|
4838
PUT
Webster Financial
WBS
$12.3B
| $128K | ﹤0.01% |
3,200
-1,400
| -30% | -$59.5K |
|
|
VSTO
4839
DELISTED
Vista Outdoor Inc.
VSTO
| $128K | ﹤0.01% |
+3,888
| New | +$115K |
|
4840
CALL
BOK Financial
BOKF
$8.58B
| $127K | ﹤0.01% |
1,600
-4,200
| -72% | -$355K |
|
4841
PUT
Cooper Companies
COO
$14.2B
| $127K | ﹤0.01% |
1,600
-6,400
| -80% | -$590K |
|
4842
CALL
Domo
DOMO
$171M
| $127K | ﹤0.01% |
13,000
+4,800
| +59% | +$66.7K |
|
4843
CALL
Krystal Biotech
KRYS
$10.7B
| $127K | ﹤0.01% |
1,100
-1,500
| -58% | -$183K |
|
|
BINI
4844
PUT
DELISTED
Bollinger Innovations
BINI
| – | – |
0
| – | – |
|
4845
PUT
Paylocity
PCTY
$7.75B
| $127K | ﹤0.01% |
700
-3,900
| -85% | -$783K |
|
4846
uniQure
QURE
$2.78B
| $127K | ﹤0.01% |
18,955
-4,168
| -18% | -$37.5K |
|
4847
PUT
Transact Technologies
TACT
$50.5M
| $127K | ﹤0.01% |
19,900
-5,500
| -22% | -$41.6K |
|
4848
PUT
Universal Corp
UVV
$1.37B
| $127K | ﹤0.01% |
2,700
+1,900
| +238% | +$91.8K |
|
4849
Full Truck Alliance
YMM
$10B
| $127K | ﹤0.01% |
+18,057
| New | +$125K |
|
4850
CALL
Amcor
AMCR
$21.2B
| $126K | ﹤0.01% |
2,760
-2,060
| -43% | -$99.2K |
|
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.