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 | |
|---|---|---|---|---|---|---|
3701
Equinox Gold
EQX
$7.22B
| $373K | ﹤0.01% |
88,314
-5,384
| -6% | -$26K |
|
3702
CALL
PLAYSTUDIOS Inc
MYPS
$76.9M
| $373K | ﹤0.01% |
117,500
+99,300
| +546% | +$394K |
|
3703
CALL
TransUnion
TRU
$16.2B
| $373K | ﹤0.01% |
5,200
-69,700
| -93% | -$5.46M |
|
3704
CALL
AdaptHealth
AHCO
$1.53B
| $372K | ﹤0.01% |
40,900
+22,800
| +126% | +$273K |
|
3705
PUT
Invesco DB Base Metals Fund
DBB
$305M
| $372K | ﹤0.01% |
17,600
-22,500
| -56% | -$413K |
|
3706
CALL
Rayonier
RYN
$6.64B
| $372K | ﹤0.01% |
14,439
+14,219
| +6,463% | +$397K |
|
|
LUCK
3707
PUT
Lucky Strike Entertainment
LUCK
$955M
| $372K | ﹤0.01% |
38,700
+34,200
| +760% | +$376K |
|
3708
Biogen
BIIB
$30.4B
| $371K | ﹤0.01% |
+1,447
| New | +$387K |
|
3709
CALL
Commault Systems
CVLT
$4.97B
| $371K | ﹤0.01% |
5,500
+4,900
| +817% | +$347K |
|
3710
PUT
Rocket Lab Corp
RKLB
$39.9B
| $371K | ﹤0.01% |
84,800
+16,000
| +23% | +$97.3K |
|
3711
CALL
Alpha Pro Tech
APT
$51.1M
| $370K | ﹤0.01% |
85,300
+53,500
| +168% | +$222K |
|
|
UNIT
3712
PUT
Uniti Group
UNIT
$2.53B
| $370K | ﹤0.01% |
78,400
+30,200
| +63% | +$155K |
|
3713
CALL
Payoneer
PAYO
$2.42B
| $369K | ﹤0.01% |
60,300
-4,900
| -8% | -$27.6K |
|
|
EGLE
3714
DELISTED
Eagle Bulk Shipping Inc.
EGLE
| $369K | ﹤0.01% |
8,797
-2,247
| -20% | -$98.5K |
|
3715
CALL
Bally's
BALY
$720M
| $368K | ﹤0.01% |
28,100
+26,500
| +1,656% | +$406K |
|
3716
PUT
MakeMyTrip
MMYT
$5.1B
| $368K | ﹤0.01% |
+9,100
| New | +$316K |
|
3717
TG Therapeutics
TGTX
$8.4B
| $368K | ﹤0.01% |
44,065
+35,680
| +426% | +$497K |
|
3718
PUT
Antero Midstream
AM
$10.3B
| $367K | ﹤0.01% |
30,700
-3,400
| -10% | -$40.3K |
|
|
KC
3719
CALL
Kingsoft Cloud Holdings
KC
$3.03B
| $367K | ﹤0.01% |
74,600
-6,900
| -8% | -$39.1K |
|
3720
PUT
Ultragenyx Pharmaceutical
RARE
$2.56B
| $367K | ﹤0.01% |
10,300
+6,600
| +178% | +$261K |
|
3721
Casey's General Stores
CASY
$31.7B
| $366K | ﹤0.01% |
+1,351
| New | +$342K |
|
3722
CALL
Materion
MTRN
$4.36B
| $366K | ﹤0.01% |
3,600
+3,500
| +3,500% | +$382K |
|
3723
CALL
Theravance Biopharma
TBPH
$875M
| $366K | ﹤0.01% |
42,500
+28,400
| +201% | +$274K |
|
3724
Vanguard Real Estate ETF
VNQ
$40B
| $366K | ﹤0.01% |
+4,844
| New | +$399K |
|
3725
Xenon Pharmaceuticals
XENE
$6.28B
| $366K | ﹤0.01% |
+10,735
| New | +$402K |
|
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.