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 |
Microsoft
MSFT
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
Starbucks
SBUX
|
+$26.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Healthcare | 0.21% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.2% |
| 5 | Financials | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3901
PUT
Aemetis
AMTX
$104M
| $288K | ﹤0.01% |
39,300
+36,000
| +1,091% | +$137K |
|
|
CVGW
3902
CALL
DELISTED
Calavo Growers
CVGW
| $287K | ﹤0.01% |
9,900
+8,800
| +800% | +$273K |
|
3903
PUT
Freshworks
FRSH
$3.09B
| $286K | ﹤0.01% |
16,300
+1,100
| +7% | +$16.5K |
|
3904
Meta Platforms (Facebook)
META
$1.51T
| $286K | ﹤0.01% |
1,000
-32,500
| -97% | -$8.02M |
|
3905
Nokia
NOK
$49.9B
| $286K | ﹤0.01% |
68,810
+30,225
| +78% | +$128K |
|
|
SAGE
3906
PUT
DELISTED
Sage Therapeutics
SAGE
| $286K | ﹤0.01% |
6,100
+5,200
| +578% | +$259K |
|
3907
CALL
Broadstone Net Lease
BNL
$4.3B
| $285K | ﹤0.01% |
18,500
+7,100
| +62% | +$114K |
|
3908
CALL
Kanzhun
BZ
$7.07B
| $285K | ﹤0.01% |
19,000
+600
| +3% | +$10K |
|
3909
CALL
Bio-Techne
TECH
$11.2B
| $285K | ﹤0.01% |
3,500
-6,800
| -66% | -$547K |
|
|
MAG
3910
PUT
DELISTED
MAG Silver
MAG
| $284K | ﹤0.01% |
25,500
-36,800
| -59% | -$458K |
|
3911
CALL
Pacer Trendpilot US Large Cap ETF
PTLC
$3.24B
| $284K | ﹤0.01% |
6,300
+2,000
| +47% | +$78K |
|
3912
CALL
Sinclair Inc
SBGI
$1.02B
| $284K | ﹤0.01% |
20,600
-3,700
| -15% | -$61.1K |
|
3913
10x Genomics
TXG
$5.97B
| $284K | ﹤0.01% |
+5,095
| New | +$276K |
|
|
CD
3914
CALL
DELISTED
Chindata Group Holdings Limited American Depositary Shares
CD
| $284K | ﹤0.01% |
39,700
-78,300
| -66% | -$500K |
|
|
BTWN
3915
CALL
DELISTED
Bridgetown Holdings Limited Class A Ordinary Shares
BTWN
| $284K | ﹤0.01% |
27,700
-10,100
| -27% | -$102K |
|
3916
Paylocity
PCTY
$7.43B
| $283K | ﹤0.01% |
1,534
+1,224
| +395% | +$224K |
|
3917
CALL
Vontier
VNT
$4.62B
| $283K | ﹤0.01% |
8,800
+4,700
| +115% | +$136K |
|
3918
CALL
Full Truck Alliance
YMM
$9.64B
| $283K | ﹤0.01% |
45,600
-276,800
| -86% | -$1.79M |
|
|
LEV
3919
CALL
DELISTED
The Lion Electric Company
LEV
| $283K | ﹤0.01% |
153,300
-40,400
| -21% | -$81.6K |
|
|
CGC
3920
PUT
Canopy Growth
CGC
$377M
| $282K | ﹤0.01% |
72,850
+9,060
| +14% | +$95.1K |
|
3921
PUT
Exelixis
EXEL
$14.2B
| $282K | ﹤0.01% |
14,800
-31,200
| -68% | -$601K |
|
3922
CALL
Kratos Defense & Security Solutions
KTOS
$9.12B
| $282K | ﹤0.01% |
19,700
+1,300
| +7% | +$17.6K |
|
3923
PUT
Federal Signal
FSS
$7.19B
| $281K | ﹤0.01% |
+4,400
| New | +$243K |
|
3924
CALL
PagerDuty
PD
$795M
| $281K | ﹤0.01% |
12,500
-40,300
| -76% | -$1.12M |
|
3925
CALL
Valvoline
VVV
$5.13B
| $281K | ﹤0.01% |
7,500
-163,300
| -96% | -$5.93M |
|
Similar funds
Simplex Trading's Q2 2023 Portfolio in Review
As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
- Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
- Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
- Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
- Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
- Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.
Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.