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 | |
|---|---|---|---|---|---|---|
5501
PUT
Lakeland Industries
LAKE
$113M
| $124K | ﹤0.01% |
8,400
+6,500
| +342% | +$94.6K |
|
5502
ManpowerGroup
MAN
$2.44B
| $124K | ﹤0.01% |
+3,276
| New | +$135K |
|
5503
CALL
NerdWallet
NRDS
$592M
| $124K | ﹤0.01% |
11,600
+3,000
| +35% | +$32K |
|
5504
PUT
Nu Skin
NUS
$252M
| $124K | ﹤0.01% |
10,200
-11,500
| -53% | -$121K |
|
5505
PUT
Paycom
PAYC
$7.64B
| $124K | ﹤0.01% |
600
-2,900
| -83% | -$653K |
|
5506
PUT
Progyny
PGNY
$2.44B
| $124K | ﹤0.01% |
5,800
+5,600
| +2,800% | +$127K |
|
5507
PUT
Warby Parker
WRBY
$3.28B
| $124K | ﹤0.01% |
4,500
-6,700
| -60% | -$169K |
|
5508
PUT
BrightSpring Health Services
BTSG
$11.7B
| $124K | ﹤0.01% |
4,200
-23,200
| -85% | -$539K |
|
|
CMCM
5509
PUT
Cheetah Mobile
CMCM
$86.6M
| $123K | ﹤0.01% |
15,300
-5,100
| -25% | -$31.2K |
|
5510
Edgewise Therapeutics
EWTX
$4.13B
| $123K | ﹤0.01% |
7,590
+3,407
| +81% | +$48.3K |
|
5511
Hyliion Holdings
HYLN
$635M
| $123K | ﹤0.01% |
62,729
-75,242
| -55% | -$125K |
|
5512
PUT
Kaiser Aluminum
KALU
$2.61B
| $123K | ﹤0.01% |
1,600
+1,300
| +433% | +$103K |
|
5513
Direxion Daily Retail Bull 3X ETF
RETL
$30.8M
| $123K | ﹤0.01% |
12,242
-4,324
| -26% | -$40.5K |
|
5514
PUT
Steris
STE
$22.3B
| $123K | ﹤0.01% |
500
-100
| -17% | -$23.9K |
|
|
QTOP
5515
iShares Nasdaq Top 30 Stocks ETF
QTOP
$281M
| $123K | ﹤0.01% |
3,964
+3,297
| +494% | +$97.5K |
|
|
BGFV
5516
DELISTED
Big 5 Sporting Goods
BGFV
| $122K | ﹤0.01% |
84,816
+22,694
| +37% | +$32.2K |
|
5517
CALL
Kilroy Realty
KRC
$4.52B
| $122K | ﹤0.01% |
2,900
-100
| -3% | -$3.94K |
|
5518
PUT
Champion Homes
SKY
$4.37B
| $122K | ﹤0.01% |
1,600
-1,500
| -48% | -$106K |
|
5519
PUT
Universal Corp
UVV
$1.31B
| $122K | ﹤0.01% |
2,200
-500
| -19% | -$27.6K |
|
5520
PUT
Boston Omaha
BOC
$428M
| $121K | ﹤0.01% |
9,300
+8,200
| +745% | +$110K |
|
5521
CALL
CNB Financial Corp
CCNE
$1.04B
| $121K | ﹤0.01% |
+5,000
| New | +$123K |
|
5522
CALL
Cadiz
CDZI
$251M
| $121K | ﹤0.01% |
25,700
+1,000
| +4% | +$3.49K |
|
5523
PUT
Korea Electric Power
KEP
$15.3B
| $121K | ﹤0.01% |
9,300
+8,700
| +1,450% | +$119K |
|
5524
Pilgrim's Pride
PPC
$6.51B
| $121K | ﹤0.01% |
+2,980
| New | +$135K |
|
5525
PUT
Real Brokerage
REAX
$349M
| $121K | ﹤0.01% |
29,100
+28,700
| +7,175% | +$130K |
|
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.