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 | |
|---|---|---|---|---|---|---|
3801
PUT
Calix
CALX
$2.34B
| $343K | ﹤0.01% |
7,500
+5,800
| +341% | +$263K |
|
3802
Schneider National
SNDR
$6.34B
| $343K | ﹤0.01% |
12,410
+1,247
| +11% | +$36.3K |
|
3803
Zillow
ZG
$7.74B
| $343K | ﹤0.01% |
7,666
-6,214
| -45% | -$312K |
|
3804
CALL
MidCap Financial Investment
MFIC
$811M
| $342K | ﹤0.01% |
24,900
-15,200
| -38% | -$203K |
|
3805
Belden
BDC
$4.09B
| $341K | ﹤0.01% |
+3,539
| New | +$331K |
|
3806
SM Energy
SM
$7.11B
| $341K | ﹤0.01% |
8,614
-13,970
| -62% | -$530K |
|
3807
CALL
Aurora
AUR
$12.2B
| $340K | ﹤0.01% |
144,800
-36,200
| -20% | -$112K |
|
3808
Fresenius Medical Care
FMS
$13.3B
| $340K | ﹤0.01% |
15,786
+10,547
| +201% | +$256K |
|
3809
CALL
Ameresco
AMRC
$1.04B
| $339K | ﹤0.01% |
8,800
+700
| +9% | +$33.8K |
|
3810
Credo Technology Group
CRDO
$35.9B
| $339K | ﹤0.01% |
22,276
-73,063
| -77% | -$1.15M |
|
3811
CALL
United Natural Foods
UNFI
$3.07B
| $339K | ﹤0.01% |
24,000
+8,600
| +56% | +$168K |
|
3812
CALL
Allegiant Air
ALGT
$2.73B
| $338K | ﹤0.01% |
4,400
+2,000
| +83% | +$206K |
|
|
AMPS
3813
DELISTED
Altus Power
AMPS
| $338K | ﹤0.01% |
64,405
+63,886
| +12,309% | +$391K |
|
3814
CALL
UFP Industries
UFPI
$5.14B
| $337K | ﹤0.01% |
3,300
+2,100
| +175% | +$212K |
|
|
OLK
3815
PUT
DELISTED
Olink Holding AB (publ) American Depositary Shares
OLK
| $337K | ﹤0.01% |
22,900
+100
| +0.4% | +$1.67K |
|
3816
Helmerich & Payne
HP
$3.31B
| $336K | ﹤0.01% |
7,993
-5,020
| -39% | -$210K |
|
3817
CALL
HealthEquity
HQY
$8.46B
| $336K | ﹤0.01% |
4,600
+1,000
| +28% | +$67.6K |
|
3818
TORM
TRMD
$3.05B
| $336K | ﹤0.01% |
12,230
+6,258
| +105% | +$159K |
|
3819
PUT
Alamos Gold
AGI
$12.1B
| $335K | ﹤0.01% |
29,700
+7,700
| +35% | +$92.6K |
|
3820
Coastal Financial
CCB
$1.11B
| $335K | ﹤0.01% |
+7,826
| New | +$340K |
|
3821
CALL
Gevo
GEVO
$363M
| $335K | ﹤0.01% |
282,100
-2,700
| -0.9% | -$3.99K |
|
3822
CALL
Oscar Health
OSCR
$9.47B
| $335K | ﹤0.01% |
60,200
-14,000
| -19% | -$98K |
|
|
SP
3823
CALL
DELISTED
SP Plus Corporation
SP
| $335K | ﹤0.01% |
9,300
+9,200
| +9,200% | +$356K |
|
3824
CALL
Sprinklr
CXM
$1.48B
| $334K | ﹤0.01% |
24,200
-2,700
| -10% | -$38.7K |
|
3825
CALL
Flywire
FLYW
$2.04B
| $334K | ﹤0.01% |
10,500
+6,500
| +163% | +$208K |
|
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.