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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
4626
PUT
Future Fuel
FF
$127M
| $200K | ﹤0.01% |
39,100
+20,200
| +107% | +$104K |
2019 Q3
28 quarters
|
|
4627
PUT
Verastem
VSTM
$1.03B
| $200K | ﹤0.01% |
24,800
-26,400
| -52% | -$177K |
2025 Q2
5 quarters
|
|
4628
PUT
Becton Dickinson
BDX
$59.4B
| $200K | ﹤0.01% |
3,000
-2,600
| -46% | -$452K |
2015 Q1
46 quarters
|
|
4629
CALL
Grandstand Ltd
GRSD
$29.4M
| $200K | ﹤0.01% |
132,200
+113,500
| +607% | +$210K |
2025 Q2
5 quarters
|
|
4630
ABM Industries
ABM
$3.2B
| $199K | ﹤0.01% |
4,146
+1,429
| +53% | +$68.2K |
2025 Q4
3 quarters
|
|
4631
CALL
MFA Financial
MFA
$588M
| $199K | ﹤0.01% |
25,400
+700
| +3% | +$6.26K |
2020 Q1
26 quarters
|
|
4632
CALL
ARK 21Shares Bitcoin ETF
ARKB
$2.62B
| $199K | ﹤0.01% |
7,200
-36,200
| -83% | -$854K |
2024 Q4
7 quarters
|
|
4633
Build-A-Bear
BBW
$362M
| $199K | ﹤0.01% |
7,950
+7,408
| +1,367% | +$238K |
2025 Q4
3 quarters
|
|
4634
PUT
Helus Pharma Inc. Common Stock
HELP
$648M
| $199K | ﹤0.01% |
16,200
+10,900
| +206% | +$114K |
2024 Q4
7 quarters
|
|
4635
Establishment Labs
ESTA
$2.11B
| $199K | ﹤0.01% |
3,100
-2,680
| -46% | -$213K |
2026 Q2
1 quarter
|
|
4636
CALL
Glacier Bancorp
GBCI
$6.27B
| $199K | ﹤0.01% |
4,600
-19,200
| -81% | -$928K |
2018 Q2
33 quarters
|
|
4637
CALL
BKV Corp
BKV
$2.08B
| $198K | ﹤0.01% |
9,300
+8,600
| +1,229% | +$214K |
2025 Q4
3 quarters
|
|
4638
USA Rare Earth Inc
USAR
$3.06B
| $198K | ﹤0.01% |
14,093
-173,319
| -92% | -$2.94M |
2026 Q1
2 quarters
|
|
4639
PUT
Arbutus Biopharma
ABUS
$627M
| $198K | ﹤0.01% |
41,500
+19,800
| +91% | +$95.4K |
2021 Q2
21 quarters
|
|
4640
PUT
BioCryst Pharmaceuticals
BCRX
$1.96B
| $198K | ﹤0.01% |
23,800
-2,200
| -8% | -$20.7K |
2026 Q1
2 quarters
|
|
4641
PUT
Ametek
AME
$55.5B
| $198K | ﹤0.01% |
800
+400
| +100% | +$96.6K |
2026 Q2
1 quarter
|
|
4642
PUT
Banc of California
BANC
$2.83B
| $198K | ﹤0.01% |
11,500
-19,600
| -63% | -$379K |
2023 Q2
13 quarters
|
|
4643
PUT
UDR
UDR
$11.5B
| $198K | ﹤0.01% |
5,900
+3,800
| +181% | +$143K |
2025 Q2
5 quarters
|
|
4644
Aardvark Therapeutics
AARD
$29.1M
| $198K | ﹤0.01% |
37,538
+21,621
| +136% | +$132K |
2026 Q1
2 quarters
|
|
4645
PUT
Village Farms International
VFF
$296M
| $198K | ﹤0.01% |
67,900
+400
| +0.6% | +$987 |
2025 Q2
5 quarters
|
|
4646
PUT
James Hardie Industries
JHX
$16.2B
| $197K | ﹤0.01% |
7,800
+1,400
| +22% | +$38.7K |
2025 Q1
6 quarters
|
|
4647
CALL
VeriSign
VRSN
$28.1B
| $197K | ﹤0.01% |
700
-37,100
| -98% | -$10.5M |
2014 Q4
47 quarters
|
|
4648
Radware
RDWR
$1.32B
| $197K | ﹤0.01% |
6,620
+6,615
| +132,300% | +$192K |
2026 Q2
1 quarter
|
|
4649
VanEck Office and Commercial REIT ETF
DESK
$5.82M
| $197K | ﹤0.01% |
+5,260
| New | +$215K |
2026 Q3
0 quarters
|
|
4650
CALL
SLR Investment Corp
SLRC
$623M
| $197K | ﹤0.01% |
17,000
+12,500
| +278% | +$157K |
2020 Q1
26 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.