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 | |
|---|---|---|---|---|---|---|
6701
PUT
GoPro
GPRO
$124M
| $18K | ﹤0.01% |
6,000
+2,200
| +58% | +$8.35K |
|
6702
iShares Currency Hedged MSCI Japan ETF
HEWJ
$724M
| $18K | ﹤0.01% |
+540
| New | +$18.2K |
|
6703
iShares US Healthcare Providers ETF
IHF
$1.21B
| $18K | ﹤0.01% |
385
-1,215
| -76% | -$61.7K |
|
6704
PUT
inTEST
INTT
$155M
| $18K | ﹤0.01% |
1,200
-30,200
| -96% | -$558K |
|
6705
PUT
Jakks Pacific
JAKK
$302M
| $18K | ﹤0.01% |
1,000
-3,000
| -75% | -$57.3K |
|
|
KC
6706
Kingsoft Cloud Holdings
KC
$3.04B
| $18K | ﹤0.01% |
3,719
-34,391
| -90% | -$195K |
|
6707
Mayville Engineering Co
MEC
$660M
| $18K | ﹤0.01% |
+1,694
| New | +$19.6K |
|
|
NIU
6708
CALL
Niu Technologies
NIU
$203M
| $18K | ﹤0.01% |
6,600
+2,000
| +43% | +$6.97K |
|
6709
CALL
NatWest
NWG
$73.7B
| $18K | ﹤0.01% |
3,100
-700
| -18% | -$4.23K |
|
6710
PUT
OraSure Technologies
OSUR
$273M
| $18K | ﹤0.01% |
+3,200
| New | +$18K |
|
6711
PUT
Pampa Energía
PAM
$4.77B
| $18K | ﹤0.01% |
500
+200
| +67% | +$8.53K |
|
|
PVL
6712
CALL
Permianville Royalty Trust
PVL
$55.1M
| $18K | ﹤0.01% |
7,400
-600
| -8% | -$1.62K |
|
6713
PUT
Avita Medical
RCEL
$138M
| $18K | ﹤0.01% |
1,300
-11,000
| -89% | -$186K |
|
6714
Seadrill
SDRL
$2.7B
| $18K | ﹤0.01% |
406
-454
| -53% | -$21.1K |
|
6715
CALL
Spok Holdings
SPOK
$225M
| $18K | ﹤0.01% |
1,300
+100
| +8% | +$1.34K |
|
6716
Direxion Daily S&P 500 Bull 2X ETF
SPUU
$250M
| $18K | ﹤0.01% |
+219
| New | +$20.2K |
|
6717
CALL
Southwest Gas
SWX
$6.54B
| $18K | ﹤0.01% |
300
-100
| -25% | -$6.38K |
|
6718
PUT
TFS Financial
TFSL
$5.06B
| $18K | ﹤0.01% |
1,600
-3,100
| -66% | -$41.5K |
|
6719
CALL
Thryv Holdings
THRY
$180M
| $18K | ﹤0.01% |
1,000
-46,300
| -98% | -$1.03M |
|
|
UDMY
6720
CALL
DELISTED
Udemy
UDMY
| $18K | ﹤0.01% |
1,900
+1,600
| +533% | +$16.7K |
|
6721
PUT
Vertex
VERX
$2.04B
| $18K | ﹤0.01% |
+800
| New | +$16.5K |
|
6722
PUT
Telefônica Brasil
VIV
$20.6B
| $18K | ﹤0.01% |
2,200
| – | – |
|
6723
Valmont Industries
VMI
$9.2B
| $18K | ﹤0.01% |
78
+64
| +457% | +$16.5K |
|
6724
CALL
Expro Ltd
XPRO
$1.71B
| $18K | ﹤0.01% |
+800
| New | +$18K |
|
6725
ProShares Ultra FTSE China 50 of PROSHARES TRUST
XPP
$9.79M
| $18K | ﹤0.01% |
+1,088
| New | +$20.3K |
|
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.