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 | |
|---|---|---|---|---|---|---|
|
SRTA
2751
PUT
Strata Critical Medical Inc
SRTA
$436M
| $1.34M | ﹤0.01% |
264,500
-18,500
| -7% | -$81.7K |
|
2752
PUT
Hallador Energy
HNRG
$718M
| $1.34M | ﹤0.01% |
68,400
+67,200
| +5,600% | +$1.15M |
|
2753
PUT
Banco Bradesco
BBD
$38.1B
| $1.33M | ﹤0.01% |
394,500
+17,400
| +5% | +$52.5K |
|
2754
VanEck Uranium + Nuclear Energy ETF
NLR
$3.89B
| $1.33M | ﹤0.01% |
9,827
+6,111
| +164% | +$728K |
|
2755
PNC Financial Services
PNC
$100B
| $1.33M | ﹤0.01% |
+6,621
| New | +$1.31M |
|
|
GES
2756
PUT
DELISTED
Guess Inc
GES
| $1.33M | ﹤0.01% |
79,500
-2,100
| -3% | -$31.1K |
|
2757
PUT
Semtech
SMTC
$11.7B
| $1.33M | ﹤0.01% |
18,600
-49,300
| -73% | -$2.68M |
|
2758
Alliance Resource Partners
ARLP
$3.18B
| $1.32M | ﹤0.01% |
52,385
-7,339
| -12% | -$184K |
|
2759
PUT
Incyte
INCY
$23.5B
| $1.32M | ﹤0.01% |
15,600
+12,300
| +373% | +$972K |
|
2760
Cboe Global Markets
CBOE
$29.8B
| $1.32M | ﹤0.01% |
5,391
+1,763
| +49% | +$424K |
|
2761
CALL
Rithm Capital
RITM
$5.09B
| $1.32M | ﹤0.01% |
116,100
-78,600
| -40% | -$952K |
|
2762
Birkenstock
BIRK
$7.47B
| $1.32M | ﹤0.01% |
29,171
-636
| -2% | -$31.1K |
|
2763
PUT
Canadian Solar
CSIQ
$906M
| $1.31M | ﹤0.01% |
100,900
+7,700
| +8% | +$92.1K |
|
2764
PUT
Progress Software
PRGS
$1.55B
| $1.31M | ﹤0.01% |
29,900
+13,800
| +86% | +$636K |
|
2765
CALL
TORM
TRMD
$3.1B
| $1.31M | ﹤0.01% |
63,700
+38,200
| +150% | +$769K |
|
2766
CALL
Perrigo
PRGO
$1.4B
| $1.31M | ﹤0.01% |
58,800
+1,300
| +2% | +$31.8K |
|
2767
PUT
Euronet Worldwide
EEFT
$3.02B
| $1.31M | ﹤0.01% |
14,900
+13,300
| +831% | +$1.28M |
|
2768
PUT
Korn Ferry
KFY
$3.98B
| $1.31M | ﹤0.01% |
18,700
+12,000
| +179% | +$875K |
|
2769
CALL
TTM Technologies
TTMI
$13.6B
| $1.31M | ﹤0.01% |
22,700
+20,800
| +1,095% | +$967K |
|
2770
CALL
Weatherford International
WFRD
$6.36B
| $1.31M | ﹤0.01% |
19,100
+9,700
| +103% | +$576K |
|
2771
PUT
DigitalBridge
DBRG
$2.94B
| $1.31M | ﹤0.01% |
111,700
+34,900
| +45% | +$390K |
|
2772
PUT
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $1.31M | ﹤0.01% |
21,000
-3,800
| -15% | -$237K |
|
2773
CALL
Itaú Unibanco
ITUB
$91.3B
| $1.31M | ﹤0.01% |
183,340
+24,308
| +15% | +$161K |
|
2774
CALL
Beyond Meat
BYND
$288M
| $1.3M | ﹤0.01% |
690,000
+445,200
| +182% | +$1.31M |
|
2775
CALL
Check Point Software Technologies
CHKP
$13.3B
| $1.3M | ﹤0.01% |
6,300
+2,400
| +62% | +$484K |
|
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.