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 | |
|---|---|---|---|---|---|---|
3751
CALL
Worthington Enterprises
WOR
$2.82B
| $527K | ﹤0.01% |
9,500
+6,000
| +171% | +$378K |
|
3752
CALL
BioCryst Pharmaceuticals
BCRX
$2.48B
| $526K | ﹤0.01% |
69,400
-66,800
| -49% | -$556K |
|
3753
PUT
Brookfield Renewable
BEP
$9.7B
| $526K | ﹤0.01% |
20,400
-1,900
| -9% | -$48.9K |
|
3754
Cooper Companies
COO
$14.1B
| $526K | ﹤0.01% |
7,675
+3,548
| +86% | +$251K |
|
3755
Crescent Energy
CRGY
$3.44B
| $526K | ﹤0.01% |
59,066
+51,996
| +735% | +$472K |
|
3756
PUT
Melco Resorts & Entertainment
MLCO
$2.19B
| $526K | ﹤0.01% |
57,400
-71,700
| -56% | -$656K |
|
3757
CALL
Nano X Imaging
NNOX
$61.1M
| $526K | ﹤0.01% |
142,400
-139,300
| -49% | -$620K |
|
3758
CALL
Cardlytics
CDLX
$22.3M
| $525K | ﹤0.01% |
21,630
+17,270
| +396% | +$288K |
|
|
COOP
3759
DELISTED
Mr. Cooper
COOP
| $525K | ﹤0.01% |
2,495
-494
| -17% | -$91K |
|
3760
CALL
International Seaways
INSW
$4.63B
| $525K | ﹤0.01% |
11,400
+3,900
| +52% | +$169K |
|
3761
PUT
Teekay Tankers
TNK
$2.66B
| $525K | ﹤0.01% |
10,400
+1,100
| +12% | +$52.2K |
|
3762
PUT
Toro Company
TTC
$9.08B
| $525K | ﹤0.01% |
6,900
-300
| -4% | -$23K |
|
|
DYNC
3763
CALL
Dynamix Corp
DYNC
$239M
| $525K | ﹤0.01% |
+50,500
| New | +$543K |
|
3764
CALL
AGCO
AGCO
$8.96B
| $524K | ﹤0.01% |
4,900
+700
| +17% | +$77.3K |
|
3765
PUT
Finance of America Companies
FOA
$218M
| $524K | ﹤0.01% |
23,400
+17,600
| +303% | +$439K |
|
3766
CALL
Moody's
MCO
$83.9B
| $524K | ﹤0.01% |
1,100
-18,100
| -94% | -$9.12M |
|
3767
CALL
Amplitude
AMPL
$1.16B
| $523K | ﹤0.01% |
48,800
+7,600
| +18% | +$90.2K |
|
3768
CALL
TransAlta
TAC
$4.03B
| $523K | ﹤0.01% |
38,300
+6,900
| +22% | +$84.9K |
|
3769
PUT
Textron
TXT
$15.6B
| $523K | ﹤0.01% |
6,200
-7,400
| -54% | -$603K |
|
3770
CALL
United States Brent Oil Fund
BNO
$724M
| $522K | ﹤0.01% |
17,400
-27,700
| -61% | -$839K |
|
3771
PUT
Iridium Communications
IRDM
$4.81B
| $522K | ﹤0.01% |
29,900
+5,800
| +24% | +$143K |
|
|
AVGX
3772
Defiance Daily Target 2X Long AVGO ETF
AVGX
$238M
| $522K | ﹤0.01% |
10,918
+8,397
| +333% | +$362K |
|
|
VG
3773
Venture Global Inc
VG
$30.2B
| $521K | ﹤0.01% |
+36,770
| New | +$524K |
|
3774
PUT
Hartford Financial Services
HIG
$39.3B
| $520K | ﹤0.01% |
3,900
-4,300
| -52% | -$552K |
|
3775
PUT
Ocular Therapeutix
OCUL
$1.85B
| $520K | ﹤0.01% |
44,500
-18,000
| -29% | -$215K |
|
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.