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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3176
Hertz
HTZ
$616M
| $541K | ﹤0.01% |
+33,227
| New | +$579K |
|
3177
PUT
Stride
LRN
$3.88B
| $541K | ﹤0.01% |
13,800
-2,200
| -14% | -$86.3K |
|
3178
PUT
AGCO
AGCO
$8.57B
| $540K | ﹤0.01% |
4,000
-1,700
| -30% | -$230K |
|
3179
CALL
ATN International
ATNI
$363M
| $540K | ﹤0.01% |
+13,200
| New | +$583K |
|
3180
PUT
Kyndryl
KD
$2.84B
| $540K | ﹤0.01% |
36,600
-9,500
| -21% | -$135K |
|
3181
CALL
Vaxcyte
PCVX
$8.06B
| $539K | ﹤0.01% |
14,400
+14,100
| +4,700% | +$598K |
|
3182
abrdn Physical Gold Shares ETF
SGOL
$6.95B
| $539K | ﹤0.01% |
+28,600
| New | +$518K |
|
|
VRNT
3183
CALL
DELISTED
Verint Systems
VRNT
| $539K | ﹤0.01% |
14,500
-20,900
| -59% | -$780K |
|
|
AJRD
3184
CALL
DELISTED
Aerojet Rocketdyne Holdings
AJRD
| $539K | ﹤0.01% |
9,600
-2,500
| -21% | -$140K |
|
3185
PUT
Fortuna Silver Mines
FSM
$2.58B
| $538K | ﹤0.01% |
141,000
-62,500
| -31% | -$222K |
|
3186
PUT
Protagonist Therapeutics
PTGX
$8.8B
| $538K | ﹤0.01% |
23,400
+19,800
| +550% | +$333K |
|
|
DOC
3187
CALL
DELISTED
PHYSICIANS REALTY TRUST
DOC
| $538K | ﹤0.01% |
36,100
-2,800
| -7% | -$42.2K |
|
3188
PUT
BlackLine
BL
$1.81B
| $537K | ﹤0.01% |
8,000
-18,700
| -70% | -$1.29M |
|
3189
PUT
Everest Group
EG
$15.4B
| $537K | ﹤0.01% |
1,500
-3,600
| -71% | -$1.29M |
|
3190
Transmedics
TMDX
$2.55B
| $537K | ﹤0.01% |
7,094
-1,663
| -19% | -$115K |
|
3191
Boston Scientific
BSX
$68.7B
| $536K | ﹤0.01% |
10,720
-15,091
| -58% | -$711K |
|
3192
PUT
Fluence Energy
FLNC
$1.74B
| $536K | ﹤0.01% |
26,500
-21,500
| -45% | -$427K |
|
|
KC
3193
CALL
Kingsoft Cloud Holdings
KC
$2.97B
| $536K | ﹤0.01% |
60,400
+38,100
| +171% | +$187K |
|
3194
PUT
Sprott Uranium Miners ETF
URNM
$1.81B
| $536K | ﹤0.01% |
17,100
-6,000
| -26% | -$201K |
|
3195
CALL
Sensata Technologies
ST
$6.66B
| $535K | ﹤0.01% |
10,700
+9,900
| +1,238% | +$479K |
|
3196
CALL
ACI Worldwide
ACIW
$5.9B
| $534K | ﹤0.01% |
19,800
+9,600
| +94% | +$254K |
|
3197
PUT
Brookfield Renewable
BEPC
$5.9B
| $534K | ﹤0.01% |
15,300
+9,400
| +159% | +$285K |
|
|
PPL
3198
PUT
PPL Corp
PPL
$27.1B
| $533K | ﹤0.01% |
19,200
+1,200
| +7% | +$34K |
|
3199
Direxion Daily 20+ Year Treasury Bear 3X ETF
TMV
$177M
| $533K | ﹤0.01% |
+19,896
| New | +$575K |
|
|
UCTT
3200
CALL
Ultra Clean Holdings
UCTT
$3.76B
| $533K | ﹤0.01% |
16,100
+10,000
| +164% | +$331K |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.