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
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2876
CALL
Corsair Gaming
CRSR
$1.08B
| $1.19M | ﹤0.01% |
133,000
+11,500
| +9% | +$104K |
|
2877
Northern Trust
NTRS
$22.2B
| $1.19M | ﹤0.01% |
+8,816
| New | +$1.13M |
|
|
RZLV
2878
Rezolve AI
RZLV
$905M
| $1.19M | ﹤0.01% |
238,335
+162,523
| +214% | +$640K |
|
2879
PUT
PagSeguro Digital
PAGS
$2.62B
| $1.19M | ﹤0.01% |
118,500
+50,100
| +73% | +$451K |
|
2880
PUT
KULR Technology Group
KULR
$120M
| $1.18M | ﹤0.01% |
284,500
-194,900
| -41% | -$1.04M |
|
2881
CALL
Altimmune
ALT
$554M
| $1.18M | ﹤0.01% |
313,400
-518,700
| -62% | -$2M |
|
2882
PUT
AutoNation
AN
$7.11B
| $1.18M | ﹤0.01% |
5,400
+2,800
| +108% | +$590K |
|
2883
Viasat
VSAT
$10B
| $1.18M | ﹤0.01% |
40,276
-7,962
| -17% | -$190K |
|
|
ETOR
2884
CALL
eToro Group
ETOR
$2.95B
| $1.18M | ﹤0.01% |
28,600
+6,100
| +27% | +$314K |
|
2885
CALL
Arch Capital
ACGL
$36.5B
| $1.18M | ﹤0.01% |
13,000
-600
| -4% | -$53.8K |
|
2886
PUT
Funko
FNKO
$335M
| $1.18M | ﹤0.01% |
342,800
+263,500
| +332% | +$978K |
|
2887
CALL
US Foods
USFD
$21.8B
| $1.18M | ﹤0.01% |
15,400
-300
| -2% | -$23.9K |
|
|
GRNY
2888
FundStrat Granny Shots US Large Cap ETF
GRNY
$4.28B
| $1.18M | ﹤0.01% |
47,186
-10,099
| -18% | -$239K |
|
2889
PUT
Monte Rosa Therapeutics
GLUE
$1.91B
| $1.18M | ﹤0.01% |
159,100
+152,900
| +2,466% | +$810K |
|
2890
Align Technology
ALGN
$12.1B
| $1.18M | ﹤0.01% |
9,403
+1,256
| +15% | +$197K |
|
|
FLY
2891
CALL
Firefly Aerospace
FLY
$3.2B
| $1.18M | ﹤0.01% |
+40,100
| New | +$1.8M |
|
2892
CALL
Aecom
ACM
$9.11B
| $1.17M | ﹤0.01% |
9,000
-5,400
| -38% | -$652K |
|
2893
CALL
Elbit Systems
ESLT
$37.9B
| $1.17M | ﹤0.01% |
2,300
+400
| +21% | +$187K |
|
2894
CALL
Microbot Medical
MBOT
$116M
| $1.17M | ﹤0.01% |
384,000
+144,300
| +60% | +$450K |
|
2895
Richtech Robotics
RR
$333M
| $1.17M | ﹤0.01% |
+273,064
| New | +$718K |
|
2896
PUT
Scotiabank
BNS
$106B
| $1.17M | ﹤0.01% |
18,100
+4,300
| +31% | +$253K |
|
2897
CALL
Aquestive Therapeutics
AQST
$471M
| $1.17M | ﹤0.01% |
209,000
+153,600
| +277% | +$664K |
|
2898
CALL
Crown Holdings
CCK
$12.9B
| $1.17M | ﹤0.01% |
12,100
+7,100
| +142% | +$712K |
|
2899
Western Midstream Partners
WES
$19.4B
| $1.17M | ﹤0.01% |
29,747
-3,933
| -12% | -$154K |
|
|
ALMS
2900
PUT
Alumis Inc
ALMS
$3.57B
| $1.17M | ﹤0.01% |
292,500
-30,000
| -9% | -$124K |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.