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 | |
|---|---|---|---|---|---|---|
6576
PUT
Veeco
VECO
$2.62B
| $45K | ﹤0.01% |
1,500
+1,000
| +200% | +$23.8K |
|
6577
Vera Bradley
VRA
$98.7M
| $45K | ﹤0.01% |
22,641
+13,503
| +148% | +$28.6K |
|
|
WSR
6578
DELISTED
Whitestone REIT
WSR
| $45K | ﹤0.01% |
3,715
+3,701
| +26,436% | +$46.6K |
|
6579
PUT
York Water
YORW
$511M
| $45K | ﹤0.01% |
1,500
+1,300
| +650% | +$40.3K |
|
|
ZK
6580
DELISTED
Zeekr
ZK
| $45K | ﹤0.01% |
1,478
-1,931
| -57% | -$56K |
|
|
AUTL
6581
CALL
Autolus Therapeutics
AUTL
$389M
| $44K | ﹤0.01% |
27,100
+2,900
| +12% | +$5.67K |
|
6582
PUT
CG Oncology
CGON
$6.1B
| $44K | ﹤0.01% |
1,100
-1,000
| -48% | -$29.1K |
|
|
FBRT
6583
Franklin BSP Realty Trust
FBRT
$580M
| $44K | ﹤0.01% |
4,093
+101
| +3% | +$1.11K |
|
6584
PUT
Jacobs Solutions
J
$16B
| $44K | ﹤0.01% |
1,500
-4,400
| -75% | -$632K |
|
6585
PUT
St. Joe Company
JOE
$3.55B
| $44K | ﹤0.01% |
900
-500
| -36% | -$25.2K |
|
6586
PetMed Express
PETS
$42.3M
| $44K | ﹤0.01% |
17,674
-1,096
| -6% | -$3.39K |
|
|
RC
6587
CALL
Ready Capital
RC
$260M
| $44K | ﹤0.01% |
11,500
+500
| +5% | +$2.11K |
|
6588
Radiant Logistics
RLGT
$400M
| $44K | ﹤0.01% |
+7,472
| New | +$46K |
|
6589
PUT
Stellus Capital Investment Corp
SCM
$205M
| $44K | ﹤0.01% |
3,400
+2,400
| +240% | +$34.6K |
|
6590
CALL
SFL Corp
SFL
$1.61B
| $44K | ﹤0.01% |
5,900
-11,700
| -66% | -$101K |
|
6591
CALL
Southern First Bancshares
SFST
$581M
| $44K | ﹤0.01% |
+1,000
| New | +$42.7K |
|
6592
PUT
Sylvamo
SLVM
$1.52B
| $44K | ﹤0.01% |
1,000
+600
| +150% | +$27.8K |
|
6593
Sprout Social
SPT
$530M
| $44K | ﹤0.01% |
3,467
+1,786
| +106% | +$29.2K |
|
6594
CALL
Vericel Corp
VCEL
$2.38B
| $44K | ﹤0.01% |
1,400
-1,800
| -56% | -$64.6K |
|
6595
PUT
Veracyte
VCYT
$4.45B
| $44K | ﹤0.01% |
1,300
-100
| -7% | -$2.87K |
|
6596
WidePoint Corp
WYY
$97.4M
| $44K | ﹤0.01% |
8,976
+4,600
| +105% | +$18.7K |
|
|
MAGN
6597
CALL
Magnera Corp
MAGN
$493M
| $44K | ﹤0.01% |
3,800
-14,100
| -79% | -$175K |
|
|
NPKI
6598
CALL
NPK International
NPKI
$1.02B
| $44K | ﹤0.01% |
3,900
| – | – |
|
6599
CALL
Mission Produce
AVO
$1.14B
| $43K | ﹤0.01% |
3,600
-3,100
| -46% | -$38.3K |
|
6600
EverQuote
EVER
$949M
| $43K | ﹤0.01% |
+1,922
| New | +$46.4K |
|
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.