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 | |
|---|---|---|---|---|---|---|
3726
PUT
Fluor
FLR
$6.89B
| $331K | ﹤0.01% |
11,200
-111,800
| -91% | -$3.21M |
|
3727
PUT
Bain Capital Specialty
BCSF
$833M
| $330K | ﹤0.01% |
24,500
-9,500
| -28% | -$117K |
|
|
TGI
3728
CALL
DELISTED
Triumph Group
TGI
| $330K | ﹤0.01% |
26,700
-321,800
| -92% | -$3.67M |
|
3729
PUT
Assured Guaranty
AGO
$3.79B
| $329K | ﹤0.01% |
5,900
+3,100
| +111% | +$165K |
|
3730
PUT
Carlyle Group
CG
$16.7B
| $329K | ﹤0.01% |
10,300
-276,300
| -96% | -$8.07M |
|
3731
CALL
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$543M
| $329K | ﹤0.01% |
+9,800
| New | +$286K |
|
3732
PUT
Applied Digital
APLD
$7.61B
| $328K | ﹤0.01% |
+35,100
| New | +$209K |
|
3733
Ardelyx
ARDX
$1.25B
| $328K | ﹤0.01% |
+96,940
| New | +$397K |
|
3734
Kanzhun
BZ
$7.07B
| $328K | ﹤0.01% |
21,833
+19,088
| +695% | +$319K |
|
3735
Cytokinetics
CYTK
$10.8B
| $328K | ﹤0.01% |
10,073
+8,810
| +698% | +$326K |
|
|
HAPN
3736
Happen Inc
HAPN
$2.19B
| $328K | ﹤0.01% |
33,726
-2,037
| -6% | -$16.4K |
|
3737
CALL
Limbach Holdings
LMB
$864M
| $328K | ﹤0.01% |
13,300
+6,200
| +87% | +$125K |
|
3738
Magnite
MGNI
$2.82B
| $328K | ﹤0.01% |
24,057
+12,330
| +105% | +$137K |
|
|
ARI
3739
CALL
Apollo Commercial Real Estate
ARI
$881M
| $327K | ﹤0.01% |
28,900
-16,100
| -36% | -$162K |
|
3740
CALL
Viper Energy
VNOM
$8.21B
| $327K | ﹤0.01% |
12,200
+5,500
| +82% | +$151K |
|
3741
Varonis Systems
VRNS
$5.13B
| $327K | ﹤0.01% |
12,299
-7,869
| -39% | -$196K |
|
3742
PUT
MannKind Corp
MNKD
$1.21B
| $326K | ﹤0.01% |
80,100
+11,800
| +17% | +$49.2K |
|
3743
Upwork
UPWK
$1.21B
| $326K | ﹤0.01% |
35,008
+30,679
| +709% | +$278K |
|
3744
PUT
Vishay Intertechnology
VSH
$5.02B
| $326K | ﹤0.01% |
11,100
-1,700
| -13% | -$41.5K |
|
3745
Agios Pharmaceuticals
AGIO
$2.14B
| $324K | ﹤0.01% |
11,454
-3,380
| -23% | -$84.1K |
|
3746
PUT
Editas Medicine
EDIT
$402M
| $324K | ﹤0.01% |
39,400
-2,200
| -5% | -$19.2K |
|
3747
PUT
Vanguard Dividend Appreciation ETF
VIG
$113B
| $324K | ﹤0.01% |
2,000
+200
| +11% | +$31.3K |
|
3748
PUT
United Parks & Resorts
PRKS
$2.21B
| $324K | ﹤0.01% |
5,800
-4,200
| -42% | -$237K |
|
3749
PUT
Bausch + Lomb
BLCO
$5.92B
| $323K | ﹤0.01% |
16,100
+2,700
| +20% | +$49K |
|
3750
PUT
Vaalco Energy
EGY
$540M
| $323K | ﹤0.01% |
86,000
-4,400
| -5% | -$18K |
|
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.