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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 | |
|---|---|---|---|---|---|---|---|
1401
CALL
Synchrony
SYF
$23.4B
| $3.73M | ﹤0.01% |
52,600
+42,900
| +442% | +$3.26M |
2015 Q2
45 quarters
|
|
1402
Biogen
BIIB
$37.5B
| $3.73M | ﹤0.01% |
16,511
+7,528
| +84% | +$1.6M |
2024 Q2
9 quarters
|
|
1403
PUT
Liquidia Corp
LQDA
$4.94B
| $3.73M | ﹤0.01% |
123,200
+81,700
| +197% | +$6.15M |
2020 Q4
23 quarters
|
|
1404
CALL
Nektar Therapeutics
NKTR
$1.31B
| $3.72M | ﹤0.01% |
61,400
+39,700
| +183% | +$2.79M |
2024 Q1
10 quarters
|
|
1405
PUT
Revolution Medicines
RVMD
$39.1B
| $3.72M | ﹤0.01% |
18,100
+500
| +3% | +$99.1K |
2023 Q1
14 quarters
|
|
1406
PUT
ProShares Ultra S&P500
SSO
$7.42B
| $3.71M | ﹤0.01% |
66,100
-36,500
| -36% | -$2.53M |
2014 Q4
47 quarters
|
|
1407
ProShares UltraPro Short S&P 500
SPXU
$384M
| $3.71M | ﹤0.01% |
106,566
+40,897
| +62% | +$1.45M |
2025 Q3
4 quarters
|
|
1408
PUT
Medical Properties Trust
MPT
$1.05B
| $3.71M | ﹤0.01% |
1,071,200
-39,300
| -4% | -$165K |
2016 Q2
41 quarters
|
|
1409
Tower Semiconductor
TSEM
$18B
| $3.7M | ﹤0.01% |
16,273
+3,464
| +27% | +$784K |
2025 Q4
3 quarters
|
|
1410
PUT
SBA Communications
SBAC
$19.8B
| $3.7M | ﹤0.01% |
23,100
+22,700
| +5,675% | +$4.12M |
2021 Q2
21 quarters
|
|
1411
CALL
Aurora
AUR
$9.29B
| $3.7M | ﹤0.01% |
667,000
+136,700
| +26% | +$860K |
2023 Q1
14 quarters
|
|
1412
IQVIA
IQV
$45.2B
| $3.69M | ﹤0.01% |
13,742
+3,616
| +36% | +$874K |
2026 Q2
1 quarter
|
|
1413
CALL
Molson Coors Class B
TAP
$7.36B
| $3.69M | ﹤0.01% |
101,100
+8,600
| +9% | +$346K |
2014 Q4
47 quarters
|
|
1414
PUT
Paychex
PAYX
$41.1B
| $3.68M | ﹤0.01% |
37,400
+23,200
| +163% | +$2.68M |
2016 Q3
40 quarters
|
|
1415
CALL
Par Pacific Holdings
PARR
$3.56B
| $3.68M | ﹤0.01% |
45,100
+4,000
| +10% | +$308K |
2021 Q1
22 quarters
|
|
1416
PUT
Under Armour Class C
UA
$2.08B
| $3.68M | ﹤0.01% |
824,900
-631,900
| -43% | -$3.57M |
2016 Q2
41 quarters
|
|
1417
CALL
Public Service Enterprise Group
PEG
$37B
| $3.67M | ﹤0.01% |
54,500
+10,600
| +24% | +$795K |
2026 Q1
2 quarters
|
|
1418
PUT
Roivant Sciences
ROIV
$30.3B
| $3.66M | ﹤0.01% |
100,100
+3,700
| +4% | +$134K |
2022 Q1
18 quarters
|
|
1419
CALL
Cohu
COHU
$2.18B
| $3.66M | ﹤0.01% |
53,700
+32,600
| +155% | +$1.77M |
2019 Q1
30 quarters
|
|
1420
PUT
Photronics
PLAB
$1.71B
| $3.64M | ﹤0.01% |
118,200
+45,100
| +62% | +$1.35M |
2019 Q1
30 quarters
|
|
1421
PUT
Monolithic Power Systems
MPWR
$72.1B
| $3.64M | ﹤0.01% |
2,700
+600
| +29% | +$786K |
2018 Q2
33 quarters
|
|
1422
CALL
Brookfield Asset Management
BAM
$84B
| $3.63M | ﹤0.01% |
81,500
-15,800
| -16% | -$771K |
2026 Q1
2 quarters
|
|
1423
CALL
PAR Technology
PAR
$921M
| $3.62M | ﹤0.01% |
262,900
-5,500
| -2% | -$95K |
2019 Q2
29 quarters
|
|
1424
CALL
SEALSQ Corp
LAES
$319M
| $3.61M | ﹤0.01% |
1,542,000
-102,800
| -6% | -$260K |
2025 Q1
6 quarters
|
|
1425
PUT
JetBlue
JBLU
$1.52B
| $3.6M | ﹤0.01% |
851,800
+464,800
| +120% | +$2.4M |
2014 Q4
47 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.