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 | |
|---|---|---|---|---|---|---|
2851
Revolve Group
RVLV
$1.83B
| $841K | ﹤0.01% |
61,855
-22,586
| -27% | -$360K |
|
|
AZUL
2852
PUT
DELISTED
Azul
AZUL
| $839K | ﹤0.01% |
97,700
+18,600
| +24% | +$185K |
|
2853
CALL
Legend Biotech
LEGN
$3.64B
| $839K | ﹤0.01% |
12,500
-13,700
| -52% | -$952K |
|
2854
CALL
Papa John's
PZZA
$1.02B
| $839K | ﹤0.01% |
12,300
-5,500
| -31% | -$425K |
|
2855
PUT
Fox Class B
FOX
$21.7B
| $838K | ﹤0.01% |
28,100
-150,700
| -84% | -$4.61M |
|
2856
CALL
Cal-Maine
CALM
$4.2B
| $837K | ﹤0.01% |
17,300
+8,300
| +92% | +$386K |
|
2857
Frontline
FRO
$8.69B
| $837K | ﹤0.01% |
44,581
+7,254
| +19% | +$122K |
|
|
SMAR
2858
CALL
DELISTED
Smartsheet Inc.
SMAR
| $837K | ﹤0.01% |
20,700
-95,800
| -82% | -$3.93M |
|
2859
CALL
Cognex
CGNX
$10B
| $836K | ﹤0.01% |
19,700
-60,000
| -75% | -$2.95M |
|
2860
CALL
BioCryst Pharmaceuticals
BCRX
$2.46B
| $835K | ﹤0.01% |
118,000
-97,400
| -45% | -$700K |
|
2861
Schwab US Dividend Equity ETF
SCHD
$103B
| $835K | ﹤0.01% |
+35,442
| New | +$870K |
|
|
ARCH
2862
DELISTED
Arch Resources, Inc.
ARCH
| $835K | ﹤0.01% |
+4,894
| New | +$656K |
|
2863
CALL
Primerica
PRI
$9.85B
| $834K | ﹤0.01% |
4,300
-1,900
| -31% | -$389K |
|
2864
PUT
10x Genomics
TXG
$5.77B
| $833K | ﹤0.01% |
20,200
-8,900
| -31% | -$463K |
|
2865
PUT
iShares Core Dividend ETF
DIVB
$1.67B
| $831K | ﹤0.01% |
24,100
+1,500
| +7% | +$58.1K |
|
|
SLCA
2866
PUT
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $831K | ﹤0.01% |
59,200
+42,300
| +250% | +$553K |
|
2867
Waters Corp
WAT
$36.4B
| $830K | ﹤0.01% |
3,029
-1,615
| -35% | -$446K |
|
2868
CALL
Ameris Bancorp
ABCB
$5.82B
| $829K | ﹤0.01% |
21,600
| – | – |
|
|
CBAY
2869
DELISTED
Cymabay Therapeutics
CBAY
| $829K | ﹤0.01% |
+55,629
| New | +$738K |
|
2870
CALL
Visteon
VC
$2.76B
| $828K | ﹤0.01% |
6,000
+5,200
| +650% | +$749K |
|
2871
UFP Technologies
UFPT
$1.9B
| $827K | ﹤0.01% |
5,125
-942
| -16% | -$165K |
|
2872
CALL
Chord Energy
CHRD
$7.57B
| $826K | ﹤0.01% |
5,100
-44,400
| -90% | -$6.97M |
|
2873
PUT
Radware
RDWR
$1.23B
| $825K | ﹤0.01% |
48,800
+4,900
| +11% | +$86.2K |
|
2874
CALL
ODDITY Tech
ODD
$751M
| $824K | ﹤0.01% |
+29,100
| New | +$1.23M |
|
|
AZEK
2875
CALL
DELISTED
The AZEK Co
AZEK
| $823K | ﹤0.01% |
27,700
+22,200
| +404% | +$698K |
|
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.