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 | |
|---|---|---|---|---|---|---|
751
CALL
Enterprise Products Partners
EPD
$83.9B
| $14.2M | 0.01% |
519,500
+97,200
| +23% | +$2.6M |
|
752
PUT
Affirm
AFRM
$23.8B
| $14.2M | 0.01% |
668,300
-130,900
| -16% | -$2.39M |
|
753
PUT
Oneok
OKE
$58.7B
| $14.2M | 0.01% |
223,600
+184,600
| +473% | +$12.1M |
|
754
Roblox
RBLX
$34B
| $14.2M | 0.01% |
488,918
+356,458
| +269% | +$11.8M |
|
755
PUT
State Street SPDR Portfolio Europe ETF
SPEU
$707M
| $14.1M | 0.01% |
334,800
+14,900
| +5% | +$566K |
|
756
CALL
Skyworks Solutions
SWKS
$9.1B
| $14.1M | 0.01% |
142,800
-23,700
| -14% | -$2.52M |
|
757
CALL
Deckers Outdoor
DECK
$13.4B
| $14M | 0.01% |
163,800
+47,400
| +41% | +$4.24M |
|
758
CALL
Digital Realty Trust
DLR
$66.4B
| $14M | 0.01% |
115,800
-111,900
| -49% | -$13.7M |
|
759
PUT
Burlington
BURL
$21.4B
| $14M | 0.01% |
103,500
-12,700
| -11% | -$2.04M |
|
760
CALL
L3Harris
LHX
$55.8B
| $14M | 0.01% |
80,400
+4,200
| +6% | +$773K |
|
761
PUT
Check Point Software Technologies
CHKP
$13.1B
| $14M | 0.01% |
105,000
+18,700
| +22% | +$2.46M |
|
762
CALL
NRG Energy
NRG
$30.2B
| $14M | 0.01% |
363,300
-45,200
| -11% | -$1.71M |
|
763
PUT
Transocean
RIG
$5.89B
| $14M | 0.01% |
1,703,800
+124,700
| +8% | +$1.02M |
|
764
PUT
Cadence Design Systems
CDNS
$91.1B
| $14M | 0.01% |
59,600
-55,000
| -48% | -$12.9M |
|
765
PUT
Allstate
ALL
$65.5B
| $13.9M | 0.01% |
124,800
+85,000
| +214% | +$9.28M |
|
766
PUT
Boston Scientific
BSX
$64.8B
| $13.9M | 0.01% |
263,200
-33,100
| -11% | -$1.74M |
|
767
CALL
Truist Financial
TFC
$62.5B
| $13.9M | 0.01% |
484,800
+79,500
| +20% | +$2.44M |
|
768
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$21.3B
| $13.9M | 0.01% |
172,260
-17,068
| -9% | -$1.44M |
|
769
CALL
Nu Holdings
NU
$68.5B
| $13.8M | 0.01% |
1,909,900
+241,000
| +14% | +$1.8M |
|
|
CTLT
770
CALL
DELISTED
CATALENT, INC.
CTLT
| $13.8M | 0.01% |
302,600
-127,700
| -30% | -$5.97M |
|
771
PUT
Cummins
CMI
$91.8B
| $13.8M | 0.01% |
60,300
+3,200
| +6% | +$773K |
|
772
PUT
Tenet Healthcare
THC
$17.1B
| $13.8M | 0.01% |
208,900
+41,800
| +25% | +$3.13M |
|
773
PUT
DaVita
DVA
$15B
| $13.8M | 0.01% |
145,500
+126,000
| +646% | +$12.9M |
|
774
CALL
Cencora
COR
$59.4B
| $13.7M | 0.01% |
76,000
+46,400
| +157% | +$8.57M |
|
775
CALL
CF Industries
CF
$19.5B
| $13.6M | 0.01% |
159,200
+65,800
| +70% | +$5.2M |
|
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.